TY - JOUR AU - Coyle, David R AB - Abstract Nonnative species often transform local communities to the detriment of native species. Much of the existing invasion ecology research focuses on the effects of a few extremely impactful species, and it is less clear how nonnative species which are not causing economic or ecological impacts alter closely related natives at risk of being displaced. Filling these knowledge gaps is critical because consequences of nonnative species are likely to vary depending on taxonomic scale, functional trait, and spatial or temporal niche. We conducted a meta-analysis to evaluate how biodiversity of native Formicidae (ants), Carabidae (ground beetles), and Scolytinae (bark and ambrosia beetles) species changes across a gradient of pressure from nonnative confamilials. We calculated Hill numbers for each group from data presented in literature and correlated native diversity metrics to proportion of nonnative species. Species richness of native ants was significantly negatively correlated with proportions of nonnative ants, whereas bark and ambrosia beetle metrics showed a nonsignificant negative correlation. Nonnative ground beetles had neutral effects on diversity of native ground beetles. Resulting contrasting patterns of invasive species effects on natives suggest complex biotic and abiotic factors driving effects of nonnative species in these groups. Our results suggest that a few extreme examples (e.g., red imported fire ants) drive most of the changes seen in native arthropod communities. To accurately assess impacts of invaders on native arthropod diversity, baseline data are needed, and community analyses must consider diverse functional traits of native taxa and improve the depth and breadth of community sampling. invasive species, biodiversity, community ecology Nonnative species are widely acknowledged to have deleterious effects on native flora and fauna communities, causing declines in species richness, evenness, and diversity (Valtonen et al. 2006, Hejda et al. 2009, Hanula and Horn 2011, Powell et al. 2011, Clark and Seewagen 2019). Despite the breadth of knowledge on the impacts of nonnative species on native ecosystems, much of the invasive species literature is focused on a relatively small number of highly influential plants, arthropods, vertebrates, and fungi (e.g., Chinese privet, Ligustrum sinense Lour.; emerald ash borer, Agrilus planipennis Fairmaire, 1888, Coleoptera: Buprestidae; wild hogs, Sus scrofa L., 1758; laurel wilt, Raffaela lauricola T.C. Harr., Fraedrich & Aghayeva). The globalization of the world’s economy and rate at which goods are transported among countries—the United States is the largest importer of goods in the world (World Trade Organization 2018)—strongly suggests that nonnative species establishment and subsequent impacts will continue and are likely to increase in frequency in the future (Seebens et al. 2017). Our ability to manage these organisms is dependent on accurate predictions of interactions with native species that directly drive ecosystem processes and resulting impacts. Additionally, examining these effects at a refined taxonomic scale (e.g., species level) is necessary to identify and manage targeted nonnative species which may have the greatest and most costly effects, both in economic and ecological terms. However, initial steps are necessary to provide a baseline understanding of family level effects before targeting certain species for investigation. Additionally, even broad analyses tend to focus on a specific region or habitat (e.g., Gandhi and Herms 2010) or on impacts to certain species (e.g., Prior and Hellman 2010). This meta-analysis will serve to investigate family-level effects across a wide range of habitats and locations. Except for highly invasive arthropods, little is known about the impacts of nonnative arthropods on diversity of native confamilial species and the existing literature suggests inconsistent responses of native arthropods to invasion by closely related nonnatives (e.g., Eubanks et al. 2002, Cooling et al. 2015). Several factors, such as phylogenetic relationships with natives and landscape level effects, are likely to play into which and how species are affected by the establishment of a nonnative species (e.g., Krushelnycky and Gillespie 2010). Multiple hypotheses exist within invasion ecology that suggest phylogenetic distance as a factor affecting whether and how nonnative species affect closely related native (e.g., ‘Adaptation’ hypothesis, Duncan and Williams 2002; ‘Darwin’s Naturalization’ hypothesis, Darwin 1809–1882). When looking at closely related native and nonnative species interactions, a few arthropod groups are well represented in the literature, namely, ants (Formicidae), ground beetles (Carabidae), and bark and ambrosia beetles (Curculionidae: Scolytinae). Nonnative ants have been studied widely in terms of their effects on native arthropods. Argentine ants (Linepithema humile (Mayr), 1868) in Japan, for example, have been shown to eradicate other ant species in certain areas (Touyama et al. 2003), and the red imported fire ant (Solenopsis invicta Buren, 1972) can displace native ant species and reduce the diversity of the local ant communities (Kaspari 2000, Wojcik et al. 2001, Cameron et al. 2016, Wang et al. 2019) and can, conversely, positively affect species richness of ant communities as well as other arthropods (Morrison and Porter 2003). Ants have also been implicated in ‘invasional meltdowns’ whereby the establishment of an invasive species—in this case, the yellow crazy ant (Anoplolepis gracilipes (F. Smith), 1857)—directly caused a shift in a rainforest ecosystem on Christmas Island, drastically affecting at least three trophic levels (O’Dowd et al. 2003). Red imported fire ants are, however, considered beneficial in some agricultural systems due to their negative effects on native pests (Kaplan and Eubanks 2005)—so, while they may indeed antagonize native species, the economic benefit to farmers may be positive (e.g., Brinkley et al. 1991). However, agricultural systems are already highly modified which has its own suite of effects on native species (e.g., Landis et al. 2000, Vankosky et al. 2017). Because ant colonies are large and mostly sessile, it is likely more difficult for native ants to leave an area following the establishment of an invasive species (Smallwood 1982, Andersen 2008). Ants are also highly competitive (Parr and Gibb 2010) compared with ground beetles, and bark and ambrosia beetles in that they directly, and indirectly, compete for resources compared with other groups which may partition resources. These life history traits may magnify effects of nonnative ants on native ant communities. Comparatively fewer studies are available examining nonnative ground beetle (Carabidae) impacts on native arthropod communities. Most literature examines a different relationship—the impacts of habitat type on ground beetle community composition (e.g., Werner and Raffa 2000, Goulet et al. 2004). Some studies have found positive effects of nonnative ground beetles due to their feeding on other nonnative pest species (e.g., Hannam et al. 2008), while others have shown negative effects, albeit indirectly, on native ground beetles through increased activity (e.g., Niemelä et al. 1997). Ground beetles, in contrast to ants, are relatively more mobile and live independently of one another (Holland 2002), making it much easier for them to move to a new area upon the establishment of an invasive species. Some of the most damaging invasive insects belong to the Curculionidae; namely, the vectors of Dutch elm disease (Scolytus multistriatus (Marsham, 1802) and S. schevyrewi (Semenov-Tian-Shanskij, 1902); Knight et al. 2012) and laurel wilt (Xyleborus glabratus Eichhoff, 1877; redbay ambrosia beetle; Fraedrich et al. 2007) are well known for causing widespread mortality of their respective hosts. Bark and ambrosia beetles are such a threat to ecosystem health that the USDA Forest Service conducts annual targeted surveys in areas most likely to experience invasion (e.g., ports, lumber yards) and these surveys also catch a variety of native bark and ambrosia beetles (Rabaglia et al. 2019). The impacts of nonnative bark and ambrosia beetles on native plants and their associated arthropods have been widely studied in a variety of habitats (e.g., Schlarbaum et al. 1998, Evans et al. 2013) and, contrary to ants and ground beetles, no positive effects on native communities have been recorded from an invasion by a nonnative bark or ambrosia beetle. However, these studies tend to focus on certain high-impact species and broad surveys of lesser known nonnatives are not as available. Bark and ambrosia beetles fall between ants and ground beetles in their ability to move to new locations—while ground beetle and ant larvae are also largely immobile, bark and ambrosia larvae must remain inside the host plant, but adults, especially females, tend to be excellent fliers and can disperse long ranges in search of appropriate hosts (Jones et al. 2019). Some female bark and ambrosia beetles are haplo-diploid, meaning that they are able to produce offspring without the benefit of a male (e.g., Gomez et al. 2018) and this life-history trait also affects their mobility and ability to establish in new locations. Because different taxa seem to have varying effects on native species, the lack of a keen understanding of native arthropod responses to the presence and relative abundance of closely related nonnative taxa may limit our ability to predict the potential economic and ecological impacts of invasion. Refining management priorities and attempting to alleviate some of the negative effects of nonnative arthropods relies on the examination of these nonnative species through a fine lens while also considering a wide range of interactions with closely related native species. Our objective was to quantify the effects of nonnative species in three arthropod groups on native confamilial diversity through a meta-analysis, focusing on ants, ground beetles, and bark and ambrosia beetles in North America. We predict that diversity metrics of all three families will be inversely correlated with the proportion of nonnative species in the sampled community. Methods Data Collection Here we define ‘nonnative’ as any organism which originated outside of North America and ‘invasive’ as a nonnative organism which causes significant impacts either economically or ecologically. To identify suitable arthropod families for use in this study, we searched for peer-reviewed articles in Google Scholar and Web of Science using the search terms ‘invasive species’, ‘nonnative’, ‘species abundance’, ‘exotic species’, and ‘arthropod’ alone and in combination. Initial searches indicated that Carabidae, Formicidae, and Scolytinae (Curculionidae) would be well represented in the literature and result in sufficient data for this study (at least 10 studies per Family or Subfamily taxa). We then added the terms ‘Scolytinae’, ‘Scolytidae’ (to identify older literature), ‘bark beetle’, ‘ambrosia beetle’, ‘Formicidae’, ‘ant’, ‘and’, ‘Carabidae’, and ‘ground beetle’ to refine our results. We did not set a date range for results. Publications were included if they met the following criteria: studies were conducted in North America, all reported organisms were identified to species, abundance data were extractable directly from the publication or could be obtained by contacting the corresponding author, and at least one nonnative species that had an abundance of one or more individuals was reported in the study. Only adult insects were included in the study because immature arthropods often have vastly different life histories than adults and are much less represented in the literature. Within individual publications, individual collection events at multiple sites and/or years were considered independent data points if they were reported separately, were spatially (e.g., sites were multiple km apart) or temporally independent (e.g., multiple years apart) and had at least 100 individuals per collecting event which were all identified to species. In cases where fewer than 100 individuals were collected across multiple collection events, counts were combined assuming sites did not change, and collections were in a short period of time (e.g., consecutive years). Within a study, all habitats were included except treatments that significantly altered arthropod communities (e.g., pesticide application) were excluded from analyses. Each replication within each study was considered a single ‘data point’. Data Analyses Cumulative proportion of all nonnative species was calculated for each data point by dividing the total number of nonnative individuals by the total number of individuals captured. Nonnative species were then removed from each dataset and Hill numbers (Hill 1973) were calculated: N0 = species richness; number of unique species N1 = exp(H); effective number of species N2 = Reciprocal of Simpson’s Index; diversity considering richness and evenness with H representing Shannon’s Index and N2 being equal to 1/(p12+ p22+ ⋯+ pn2). Nonnative species were removed to identify impacts on native species only. Evenness was also calculated for each data point and each taxon (sans nonnative species) by dividing Shannon’s Index by species richness (H/N0). Hill numbers were chosen as they describe multiple aspects of community composition and are regularly used to estimate diversity at and above the family level (e.g., Roth et al. 1994, Hoback et al. 1999). N0 refers to the number of unique species in the sample while the effective number of species (N1) refers to the number of equally abundant species needed that would result in the same mean abundance observed in the sample. Finally, N2 measures the probability that two random individuals from the same sample will belong to the same species. In all cases, the higher the value, the higher the diversity of the sample. To account for differences in collection methods, the proportion of nonnatives and all three Hill numbers were compared across habitat types, sampling methods, and sampling effort for papers that used only a single sampling type and a single habitat. Sampling methods are detailed in respective papers (Table 1). Briefly, all ground beetles were collected by pitfall trap. Ants were collected through a variety of traps including pitfall as well as leaf litter sifting, baited traps, woody debris dissection, hand collection, UV light traps, and mercury vapor traps. Bark and ambrosia beetles were collected mostly with Lindgren funnel traps and intercept panel traps. Other methods of bark and ambrosia beetle collection included sticky traps, window pane traps, malaise traps, hand collections, sweep net, fogging, and dissecting trap trees. A linear mixed effects model was created for each diversity index with proportion of nonnative species serving as the independent variable using the ‘nlme’ package (Pinheiro et al. 2020). To account for variation among publications, ‘publication’ was included as a random effect in each model. All statistical analyses were performed in R 4.0.2 (R Core Team 2020). Table 1. Summary of literature used in data analyses including habitat type sampled, sampling methods used, and number of replicates per paper Citation . Number of replications . Trapping method . Habitat . Family: Formicidae Choate and Drummond (2012) 1 Pitfall, leaf litter, baits, hand collection Agricultural field Clark et al. (2011) 1 Pitfall, baits, hand collection, malaise, UV light traps, mercury vapor trap, bee bowls Woodland, shrub, field Cumberland and Kirkman (2012)a 2 Pitfall Forest Davis and Zigler (2012) 3 Pitfall Forest Graham et al. (2004) 3 Pitfall Forest Gouchnour et al. (2019) 3 Pitfall, leaf litter, woody debris dissection, baits, hand collection Urban Guénard and Dunn (2010)a 2 Pitfall Forest Holway (1998)a 2 Pitfall, baits Forest Ivanov et al. (2011)a 3 Leaf litter, baits Urban King and Tschinkel (2006)a 4 Pitfall Agricultural field King and Tschinkel (2013)a 1 Pitfall Forest Lubertazzi and Tschinkel (2003) 12 Pitfall Forest Martelli et al. (2004) 1 Leaf litter Forest Menke et al. (2011) 1 Pitfall Urban Menzel and Nebeker (2008)a 1 Baits Forest Naumann and Higgins (2015)a 3 Pitfall Forest Pećarević et al. (2010) 1 Pitfall Urban Philpott et al. (2013) 10 Pitfall Urban Porter and Savignano (1990)a 2 Pitfall, baits Agricultural field Rowles and Silverman (2010)a 2 Pitfall, hand collection Forest Skvarla (2015) 1 Pitfall Forest Stuble et al. (2011)a 3 Pitfall Forest Toennisson et al. (2011) 1 Pitfall Urban Verble and Yanoviak (2013) 10 Leaf litter, baits, hand collection Forest Wang et al. (2000) 2 Pitfall Forest Family: Carabidae Belaoussoff et al. (2003) 1 Pitfall Agricultural field Bergmann et al. (2012) 1 Pitfall Forest Blubaugh et al. (2011) 2 Pitfall Forest, prairie Bourassa et al. (2008) 1 Pitfall Turf Bourassa et al. (2010) 3 Pitfall Agricultural field Brunke et al. (2009) 1 Pitfall Agricultural field Byers et al. (2000) 5 Pitfall Agricultural field Cárdenas and Buddle (2009) 1 Pitfall Forest Carmona and Landis (1999) 1 Pitfall Agricultural field Clark et al. (2006) 1 Pitfall Agricultural field Comeau et al. (2012) 1 Pitfall Agricultural field Cutler et al. (2012) 2 Pitfall Agricultural field Ellsbury et al. (1998) 1 Pitfall Agricultural field Firlej et al. (2012) 2 Pitfall Agricultural field French et al. (2004) 1 Pitfall Agricultural field Gagne and Fahrig (2010) 6 Pitfall Urban, forest Gandhi et al. (2008) 8 Pitfall Forest Gandhi et al. (2011) 4 Pitfall Forest Gandhi et al. (2014) 1 Pitfall Forest Gardiner et al. (2010) 1 Pitfall Agricultural field Goulet et al. (2004) 1 Pitfall Agricultural field Hartley et al. (2010) 1 Pitfall Urban, prairie Hatten et al. (2007) 9 Pitfall Agricultural field Hummel et al. (2012) 1 Pitfall Agricultural field Kleintjes et al. (2002) 1 Pitfall Prairie Koivula and Spence (2006) 1 Pitfall Forest Lalonde et al. (2012) 3 Pitfall Agricultural field Larsen and Williams (1999) 3 Pitfall Prairie Larsen and Work (2003) 1 Pitfall Prairie Larsen et al. (2003) 3 Pitfall Prairie Leslie et al. (2014) 3 Pitfall Agricultural field Melnychuk et al. (2003) 1 Pitfall Agricultural field Niwa and Peck (2002) 1 Pitfall Forest Petrillo and Witter (2009) 1 Pitfall Forest Riley and Brown (2011) 1 Pitfall Forest Russell et al. (2017) 4 Pitfall Agricultural field Rykken et al. (1997) 1 Pitfall Forest Skvarla (2015) 1 Pitfall Forest Smith et al. (2004) 2 Pitfall Agricultural field Trager et al. (2013) 1 Pitfall Forest Werling and Gratton (2008) 1 Pitfall Agricultural field Werner and Raffa (2000) 2 Pitfall Forest Family: Curculionidae: Scolytinae Atkinson et al. (1988) 2 Sticky trap, window trap Forest Coyle et al. (2005) 1 Lindgren funnel Forest Coyle et al. (2015) 2 Lindgren funnel Forest Dodds et al. (2010) 3 Lindgren funnel, intercept trap, malaise Forest Dodds et al. (2015) 1 Lindgren funnel, intercept trap, SLAM trap Forest Dodds et al. (2019) 1 Lindgren funnel, SLAM trap Forest Dodds (2011) 2 Lindgren funnel Forest Gandhi et al. (2010) 1 Lindgren funnel Urban Grant et al. (2003) 1 Hand collecting, sweep net, beat sheet, light trap, canopy fogging, malaise, Manitoba trap, pitfall Prairie Johnson et al. (2014)a 1 Lindgren funnel Forest Kendra et al. (2011)a 1 Lindgren funnel Forest Miller and Duerr (2008) 1 Lindgren funnel Forest Miller and Rabaglia (2009) 8 Lindgren funnel Forest Oliver and Mannion (2001) 1 Lindgren funnel Nursey Pfammatter et al. (2011) 3 Lindgren funnel Forest Reding et al. (2010) 4 Bottle trap Nursery Reed and Muzika (2010)a 2 Lindgren funnel Forest Reed et al. (2015)a 1 Trap trees Forest Turnbow and Franklin (1980) 1 – – Weber and McPherson (1991) 1 Window trap Forest Zylstra et al. (2010)a 1 Trap trees Forest Citation . Number of replications . Trapping method . Habitat . Family: Formicidae Choate and Drummond (2012) 1 Pitfall, leaf litter, baits, hand collection Agricultural field Clark et al. (2011) 1 Pitfall, baits, hand collection, malaise, UV light traps, mercury vapor trap, bee bowls Woodland, shrub, field Cumberland and Kirkman (2012)a 2 Pitfall Forest Davis and Zigler (2012) 3 Pitfall Forest Graham et al. (2004) 3 Pitfall Forest Gouchnour et al. (2019) 3 Pitfall, leaf litter, woody debris dissection, baits, hand collection Urban Guénard and Dunn (2010)a 2 Pitfall Forest Holway (1998)a 2 Pitfall, baits Forest Ivanov et al. (2011)a 3 Leaf litter, baits Urban King and Tschinkel (2006)a 4 Pitfall Agricultural field King and Tschinkel (2013)a 1 Pitfall Forest Lubertazzi and Tschinkel (2003) 12 Pitfall Forest Martelli et al. (2004) 1 Leaf litter Forest Menke et al. (2011) 1 Pitfall Urban Menzel and Nebeker (2008)a 1 Baits Forest Naumann and Higgins (2015)a 3 Pitfall Forest Pećarević et al. (2010) 1 Pitfall Urban Philpott et al. (2013) 10 Pitfall Urban Porter and Savignano (1990)a 2 Pitfall, baits Agricultural field Rowles and Silverman (2010)a 2 Pitfall, hand collection Forest Skvarla (2015) 1 Pitfall Forest Stuble et al. (2011)a 3 Pitfall Forest Toennisson et al. (2011) 1 Pitfall Urban Verble and Yanoviak (2013) 10 Leaf litter, baits, hand collection Forest Wang et al. (2000) 2 Pitfall Forest Family: Carabidae Belaoussoff et al. (2003) 1 Pitfall Agricultural field Bergmann et al. (2012) 1 Pitfall Forest Blubaugh et al. (2011) 2 Pitfall Forest, prairie Bourassa et al. (2008) 1 Pitfall Turf Bourassa et al. (2010) 3 Pitfall Agricultural field Brunke et al. (2009) 1 Pitfall Agricultural field Byers et al. (2000) 5 Pitfall Agricultural field Cárdenas and Buddle (2009) 1 Pitfall Forest Carmona and Landis (1999) 1 Pitfall Agricultural field Clark et al. (2006) 1 Pitfall Agricultural field Comeau et al. (2012) 1 Pitfall Agricultural field Cutler et al. (2012) 2 Pitfall Agricultural field Ellsbury et al. (1998) 1 Pitfall Agricultural field Firlej et al. (2012) 2 Pitfall Agricultural field French et al. (2004) 1 Pitfall Agricultural field Gagne and Fahrig (2010) 6 Pitfall Urban, forest Gandhi et al. (2008) 8 Pitfall Forest Gandhi et al. (2011) 4 Pitfall Forest Gandhi et al. (2014) 1 Pitfall Forest Gardiner et al. (2010) 1 Pitfall Agricultural field Goulet et al. (2004) 1 Pitfall Agricultural field Hartley et al. (2010) 1 Pitfall Urban, prairie Hatten et al. (2007) 9 Pitfall Agricultural field Hummel et al. (2012) 1 Pitfall Agricultural field Kleintjes et al. (2002) 1 Pitfall Prairie Koivula and Spence (2006) 1 Pitfall Forest Lalonde et al. (2012) 3 Pitfall Agricultural field Larsen and Williams (1999) 3 Pitfall Prairie Larsen and Work (2003) 1 Pitfall Prairie Larsen et al. (2003) 3 Pitfall Prairie Leslie et al. (2014) 3 Pitfall Agricultural field Melnychuk et al. (2003) 1 Pitfall Agricultural field Niwa and Peck (2002) 1 Pitfall Forest Petrillo and Witter (2009) 1 Pitfall Forest Riley and Brown (2011) 1 Pitfall Forest Russell et al. (2017) 4 Pitfall Agricultural field Rykken et al. (1997) 1 Pitfall Forest Skvarla (2015) 1 Pitfall Forest Smith et al. (2004) 2 Pitfall Agricultural field Trager et al. (2013) 1 Pitfall Forest Werling and Gratton (2008) 1 Pitfall Agricultural field Werner and Raffa (2000) 2 Pitfall Forest Family: Curculionidae: Scolytinae Atkinson et al. (1988) 2 Sticky trap, window trap Forest Coyle et al. (2005) 1 Lindgren funnel Forest Coyle et al. (2015) 2 Lindgren funnel Forest Dodds et al. (2010) 3 Lindgren funnel, intercept trap, malaise Forest Dodds et al. (2015) 1 Lindgren funnel, intercept trap, SLAM trap Forest Dodds et al. (2019) 1 Lindgren funnel, SLAM trap Forest Dodds (2011) 2 Lindgren funnel Forest Gandhi et al. (2010) 1 Lindgren funnel Urban Grant et al. (2003) 1 Hand collecting, sweep net, beat sheet, light trap, canopy fogging, malaise, Manitoba trap, pitfall Prairie Johnson et al. (2014)a 1 Lindgren funnel Forest Kendra et al. (2011)a 1 Lindgren funnel Forest Miller and Duerr (2008) 1 Lindgren funnel Forest Miller and Rabaglia (2009) 8 Lindgren funnel Forest Oliver and Mannion (2001) 1 Lindgren funnel Nursey Pfammatter et al. (2011) 3 Lindgren funnel Forest Reding et al. (2010) 4 Bottle trap Nursery Reed and Muzika (2010)a 2 Lindgren funnel Forest Reed et al. (2015)a 1 Trap trees Forest Turnbow and Franklin (1980) 1 – – Weber and McPherson (1991) 1 Window trap Forest Zylstra et al. (2010)a 1 Trap trees Forest aPaper focused on invasive species. Open in new tab Table 1. Summary of literature used in data analyses including habitat type sampled, sampling methods used, and number of replicates per paper Citation . Number of replications . Trapping method . Habitat . Family: Formicidae Choate and Drummond (2012) 1 Pitfall, leaf litter, baits, hand collection Agricultural field Clark et al. (2011) 1 Pitfall, baits, hand collection, malaise, UV light traps, mercury vapor trap, bee bowls Woodland, shrub, field Cumberland and Kirkman (2012)a 2 Pitfall Forest Davis and Zigler (2012) 3 Pitfall Forest Graham et al. (2004) 3 Pitfall Forest Gouchnour et al. (2019) 3 Pitfall, leaf litter, woody debris dissection, baits, hand collection Urban Guénard and Dunn (2010)a 2 Pitfall Forest Holway (1998)a 2 Pitfall, baits Forest Ivanov et al. (2011)a 3 Leaf litter, baits Urban King and Tschinkel (2006)a 4 Pitfall Agricultural field King and Tschinkel (2013)a 1 Pitfall Forest Lubertazzi and Tschinkel (2003) 12 Pitfall Forest Martelli et al. (2004) 1 Leaf litter Forest Menke et al. (2011) 1 Pitfall Urban Menzel and Nebeker (2008)a 1 Baits Forest Naumann and Higgins (2015)a 3 Pitfall Forest Pećarević et al. (2010) 1 Pitfall Urban Philpott et al. (2013) 10 Pitfall Urban Porter and Savignano (1990)a 2 Pitfall, baits Agricultural field Rowles and Silverman (2010)a 2 Pitfall, hand collection Forest Skvarla (2015) 1 Pitfall Forest Stuble et al. (2011)a 3 Pitfall Forest Toennisson et al. (2011) 1 Pitfall Urban Verble and Yanoviak (2013) 10 Leaf litter, baits, hand collection Forest Wang et al. (2000) 2 Pitfall Forest Family: Carabidae Belaoussoff et al. (2003) 1 Pitfall Agricultural field Bergmann et al. (2012) 1 Pitfall Forest Blubaugh et al. (2011) 2 Pitfall Forest, prairie Bourassa et al. (2008) 1 Pitfall Turf Bourassa et al. (2010) 3 Pitfall Agricultural field Brunke et al. (2009) 1 Pitfall Agricultural field Byers et al. (2000) 5 Pitfall Agricultural field Cárdenas and Buddle (2009) 1 Pitfall Forest Carmona and Landis (1999) 1 Pitfall Agricultural field Clark et al. (2006) 1 Pitfall Agricultural field Comeau et al. (2012) 1 Pitfall Agricultural field Cutler et al. (2012) 2 Pitfall Agricultural field Ellsbury et al. (1998) 1 Pitfall Agricultural field Firlej et al. (2012) 2 Pitfall Agricultural field French et al. (2004) 1 Pitfall Agricultural field Gagne and Fahrig (2010) 6 Pitfall Urban, forest Gandhi et al. (2008) 8 Pitfall Forest Gandhi et al. (2011) 4 Pitfall Forest Gandhi et al. (2014) 1 Pitfall Forest Gardiner et al. (2010) 1 Pitfall Agricultural field Goulet et al. (2004) 1 Pitfall Agricultural field Hartley et al. (2010) 1 Pitfall Urban, prairie Hatten et al. (2007) 9 Pitfall Agricultural field Hummel et al. (2012) 1 Pitfall Agricultural field Kleintjes et al. (2002) 1 Pitfall Prairie Koivula and Spence (2006) 1 Pitfall Forest Lalonde et al. (2012) 3 Pitfall Agricultural field Larsen and Williams (1999) 3 Pitfall Prairie Larsen and Work (2003) 1 Pitfall Prairie Larsen et al. (2003) 3 Pitfall Prairie Leslie et al. (2014) 3 Pitfall Agricultural field Melnychuk et al. (2003) 1 Pitfall Agricultural field Niwa and Peck (2002) 1 Pitfall Forest Petrillo and Witter (2009) 1 Pitfall Forest Riley and Brown (2011) 1 Pitfall Forest Russell et al. (2017) 4 Pitfall Agricultural field Rykken et al. (1997) 1 Pitfall Forest Skvarla (2015) 1 Pitfall Forest Smith et al. (2004) 2 Pitfall Agricultural field Trager et al. (2013) 1 Pitfall Forest Werling and Gratton (2008) 1 Pitfall Agricultural field Werner and Raffa (2000) 2 Pitfall Forest Family: Curculionidae: Scolytinae Atkinson et al. (1988) 2 Sticky trap, window trap Forest Coyle et al. (2005) 1 Lindgren funnel Forest Coyle et al. (2015) 2 Lindgren funnel Forest Dodds et al. (2010) 3 Lindgren funnel, intercept trap, malaise Forest Dodds et al. (2015) 1 Lindgren funnel, intercept trap, SLAM trap Forest Dodds et al. (2019) 1 Lindgren funnel, SLAM trap Forest Dodds (2011) 2 Lindgren funnel Forest Gandhi et al. (2010) 1 Lindgren funnel Urban Grant et al. (2003) 1 Hand collecting, sweep net, beat sheet, light trap, canopy fogging, malaise, Manitoba trap, pitfall Prairie Johnson et al. (2014)a 1 Lindgren funnel Forest Kendra et al. (2011)a 1 Lindgren funnel Forest Miller and Duerr (2008) 1 Lindgren funnel Forest Miller and Rabaglia (2009) 8 Lindgren funnel Forest Oliver and Mannion (2001) 1 Lindgren funnel Nursey Pfammatter et al. (2011) 3 Lindgren funnel Forest Reding et al. (2010) 4 Bottle trap Nursery Reed and Muzika (2010)a 2 Lindgren funnel Forest Reed et al. (2015)a 1 Trap trees Forest Turnbow and Franklin (1980) 1 – – Weber and McPherson (1991) 1 Window trap Forest Zylstra et al. (2010)a 1 Trap trees Forest Citation . Number of replications . Trapping method . Habitat . Family: Formicidae Choate and Drummond (2012) 1 Pitfall, leaf litter, baits, hand collection Agricultural field Clark et al. (2011) 1 Pitfall, baits, hand collection, malaise, UV light traps, mercury vapor trap, bee bowls Woodland, shrub, field Cumberland and Kirkman (2012)a 2 Pitfall Forest Davis and Zigler (2012) 3 Pitfall Forest Graham et al. (2004) 3 Pitfall Forest Gouchnour et al. (2019) 3 Pitfall, leaf litter, woody debris dissection, baits, hand collection Urban Guénard and Dunn (2010)a 2 Pitfall Forest Holway (1998)a 2 Pitfall, baits Forest Ivanov et al. (2011)a 3 Leaf litter, baits Urban King and Tschinkel (2006)a 4 Pitfall Agricultural field King and Tschinkel (2013)a 1 Pitfall Forest Lubertazzi and Tschinkel (2003) 12 Pitfall Forest Martelli et al. (2004) 1 Leaf litter Forest Menke et al. (2011) 1 Pitfall Urban Menzel and Nebeker (2008)a 1 Baits Forest Naumann and Higgins (2015)a 3 Pitfall Forest Pećarević et al. (2010) 1 Pitfall Urban Philpott et al. (2013) 10 Pitfall Urban Porter and Savignano (1990)a 2 Pitfall, baits Agricultural field Rowles and Silverman (2010)a 2 Pitfall, hand collection Forest Skvarla (2015) 1 Pitfall Forest Stuble et al. (2011)a 3 Pitfall Forest Toennisson et al. (2011) 1 Pitfall Urban Verble and Yanoviak (2013) 10 Leaf litter, baits, hand collection Forest Wang et al. (2000) 2 Pitfall Forest Family: Carabidae Belaoussoff et al. (2003) 1 Pitfall Agricultural field Bergmann et al. (2012) 1 Pitfall Forest Blubaugh et al. (2011) 2 Pitfall Forest, prairie Bourassa et al. (2008) 1 Pitfall Turf Bourassa et al. (2010) 3 Pitfall Agricultural field Brunke et al. (2009) 1 Pitfall Agricultural field Byers et al. (2000) 5 Pitfall Agricultural field Cárdenas and Buddle (2009) 1 Pitfall Forest Carmona and Landis (1999) 1 Pitfall Agricultural field Clark et al. (2006) 1 Pitfall Agricultural field Comeau et al. (2012) 1 Pitfall Agricultural field Cutler et al. (2012) 2 Pitfall Agricultural field Ellsbury et al. (1998) 1 Pitfall Agricultural field Firlej et al. (2012) 2 Pitfall Agricultural field French et al. (2004) 1 Pitfall Agricultural field Gagne and Fahrig (2010) 6 Pitfall Urban, forest Gandhi et al. (2008) 8 Pitfall Forest Gandhi et al. (2011) 4 Pitfall Forest Gandhi et al. (2014) 1 Pitfall Forest Gardiner et al. (2010) 1 Pitfall Agricultural field Goulet et al. (2004) 1 Pitfall Agricultural field Hartley et al. (2010) 1 Pitfall Urban, prairie Hatten et al. (2007) 9 Pitfall Agricultural field Hummel et al. (2012) 1 Pitfall Agricultural field Kleintjes et al. (2002) 1 Pitfall Prairie Koivula and Spence (2006) 1 Pitfall Forest Lalonde et al. (2012) 3 Pitfall Agricultural field Larsen and Williams (1999) 3 Pitfall Prairie Larsen and Work (2003) 1 Pitfall Prairie Larsen et al. (2003) 3 Pitfall Prairie Leslie et al. (2014) 3 Pitfall Agricultural field Melnychuk et al. (2003) 1 Pitfall Agricultural field Niwa and Peck (2002) 1 Pitfall Forest Petrillo and Witter (2009) 1 Pitfall Forest Riley and Brown (2011) 1 Pitfall Forest Russell et al. (2017) 4 Pitfall Agricultural field Rykken et al. (1997) 1 Pitfall Forest Skvarla (2015) 1 Pitfall Forest Smith et al. (2004) 2 Pitfall Agricultural field Trager et al. (2013) 1 Pitfall Forest Werling and Gratton (2008) 1 Pitfall Agricultural field Werner and Raffa (2000) 2 Pitfall Forest Family: Curculionidae: Scolytinae Atkinson et al. (1988) 2 Sticky trap, window trap Forest Coyle et al. (2005) 1 Lindgren funnel Forest Coyle et al. (2015) 2 Lindgren funnel Forest Dodds et al. (2010) 3 Lindgren funnel, intercept trap, malaise Forest Dodds et al. (2015) 1 Lindgren funnel, intercept trap, SLAM trap Forest Dodds et al. (2019) 1 Lindgren funnel, SLAM trap Forest Dodds (2011) 2 Lindgren funnel Forest Gandhi et al. (2010) 1 Lindgren funnel Urban Grant et al. (2003) 1 Hand collecting, sweep net, beat sheet, light trap, canopy fogging, malaise, Manitoba trap, pitfall Prairie Johnson et al. (2014)a 1 Lindgren funnel Forest Kendra et al. (2011)a 1 Lindgren funnel Forest Miller and Duerr (2008) 1 Lindgren funnel Forest Miller and Rabaglia (2009) 8 Lindgren funnel Forest Oliver and Mannion (2001) 1 Lindgren funnel Nursey Pfammatter et al. (2011) 3 Lindgren funnel Forest Reding et al. (2010) 4 Bottle trap Nursery Reed and Muzika (2010)a 2 Lindgren funnel Forest Reed et al. (2015)a 1 Trap trees Forest Turnbow and Franklin (1980) 1 – – Weber and McPherson (1991) 1 Window trap Forest Zylstra et al. (2010)a 1 Trap trees Forest aPaper focused on invasive species. Open in new tab Results In total, 86 publications and 191 individual data points were identified across three insect groups (Supp Appendix 1 [online only]). Ants were represented by 72 data points across 25 publications; Carabidae was represented by 80 data points across 41 publications; and Scolytinae was represented by 39 data points across 20 publications. Publications represented a range of sampling methods and habitats for each arthropod group (Table 1). Non-native species collected are reported in respective publications (Supp Appendix 2 [online only]). Among all groups, Naumann and Higgins (2015, Formicidae) had the lowest Hill numbers with species richness (N0) at two, N1 at 1.00, and N2 at 0.82. The upper range of Hill numbers was more variable with the highest species richness at 102 (Goulet et al. 2004, Carabidae), N1 at 47.74 (Clark et al. 2011, Formicidae), and N2 at 30.47 (Byers et al. 2000, Formicidae, 1995 data). Scolytinae had the lowest average values of Hill Numbers (N0 = 21 ± 3; N1 = 6.21 ± 1.41; N2 = 4.38 ± 1.07). Evenness ranged from 0.0068 (Naumann and Higgins 2015; Formicidae, red alder site) to 1.00 (Clark et al. 2011, Formicidae) with ants having the highest average value (0.61 ± 0.02) and Carabidae having the lowest average value (0.32 ± 0.06). Forests and prairies had the lowest proportion of nonnatives, while nurseries had the highest (F = 5.38, P = 0.0001). Sampling method was not significant, but only narrowly so, with regards to proportion of nonnatives (F = 2.12, P = 0.054). Prairies had significantly higher N0, whereas urban sites had significantly lower N0 compared with other habitat types (F = 4.26, P = 0.0012). Bottle traps had the lowest N0, whereas window traps had the highest N0 (F = 2.40, P = 0.03). However, these were also the least frequently used trap types and the N0 of the most commonly used trap types did not differ. Forest and prairie sites had the highest N1 and nurseries had the lowest N1 (F = 4.04, P = 0.002). Window traps had the highest N1, whereas trap trees had the lowest N1 (F = 2.26, P = 0.041). However, these were again the least used sampling methods and the more commonly used sampling methods did not differ significantly from each other. Sampling method, habitat type, and sampling effort did not significantly affect N2. Forests and urban sites had the highest evenness, while prairies had the lowest evenness (F = 16.81, P < 0.0001). Lindgren funnel traps had the highest evenness, while pitfall traps had the lowest evenness (F = 4.34, P = 0.0005). Within ant data collected from the literature, the proportion of nonnative species ranged from 0.0001 (Skvarla 2015) to 1.00 (Naumann and Higgins 2015, red alder). Species richness (N0) ranged from two (Naumann and Higgins 2015, red alder site, Philpott et al. 2014, G2 sites) to 72 (Skvarla 2015) with an average of 22 (±2). N1 ranged from 1.0047 (Naumann and Higgins 2015, red alder) to 47.74 (Clark et al. 2011) with an average of 7.50 (±1.0230). N2 ranged from 0.76 (Naumann and Higgins 2015, red alder) to 11.49 (Toennisson et al. 2011) with an average of 6.55 (±0.9321). Evenness ranged from 0.0068 (Naumann and Higgins 2015, red alder) to 1.00 (Clark et al. 2011) with an average of 0.62 (±0.07). Within Carabidae data collected from the literature, the proportion of nonnative species ranged from 0.0002 (French et al. 2004) to 0.96 (Lalonde et al. 2012). Species richness (N0) ranged from 9 (Hatten et al. 2007, CTB) to 102 (Goulet et al. 2004) with an average of 35 (±8). N1 ranged from 1.28 (Blubaugh et al. 2011, 2005 data) to 18.11 (Gandhi et al. 2011, Willow 1981 site) with an average of 8.50 (±1.57). N2 ranged from 1.2802 (Blubaugh et al. 2011, 2005 data) to 30.47 (Byers et al. 2000, 1995 data) with an average of 6.38 (±1.7890). Evenness ranged from 0.02 (Goulet et al. 2004) to 0.80 (Gagne and Fahrig 2010) with an average of 0.32 (±0.06). Within Scolytinae data collected from the literature, the proportion of nonnative species ranged from 0.0004 (Pfammatter et al. 2011, 2007 data) to 1.00 (Atkinson et al. 1988, window traps). Species richness (N0) ranged from 5 (Reding et al. 2010, 2007 data) to 55 (Weber and McPherson 1991) with an average of 21 ± 3. N1 ranged from 1.65 (Reding et al. 2010, 2009 data) to 13.38 (Turnbow and Franklin 1980) with an average of 6.21 (±1.41). N2 ranged from 1.29 (Reding et al. 2010, 2009 data) to 8.96 (Pfammatter et al. 2011, 2007 data) with an average of 4.38 (±1.07). Evenness ranged from 0.23 (Reding et al. 2010) to 0.91 (Reed and Muzika 2010, 2008 data) with an average of 0.10 (±0.02). Increasing proportions of nonnative confamilials was significantly correlated with a decrease in ant species richness (t47 = −2.90, P = 0.0052) and no diversity index for either Carabidae or Scolytinae was significantly affected by the proportion of nonnative species present (Table 2). Table 2. Summary of statistical coefficients Family . Index . Mean (± SE) . t-value . P-value . R2 . Formicidae N0 (richness) 22 (± 2) −2.8959 0.0052* 0.0251 N1 (Exp(H)) 7.4992 (± 1.0230) −1.3891 0.1714 0.0036 N2 (1/Simpson’s) 4.7207 (± 0.7801) 1.6628 0.1030 0.0396 Evenness 0.6185 (± 0.0680) 0.4247 0.6730 0.1662 Carabidae N0 (richness) 35 (± 8) −1.2163 0.2305 0.0117 N1 (Exp(H)) 8.5004 (± 1.5735) −0.6862 0.4962 0.0059 N2 (1/Simpson’s) 6.3823 (± 1.7890) −0.6737 0.5041 0.0059 Evenness 0.3180 (± 0.0634) 1.5469 0.1292 0.0114 Scolytinae (literature) N0 (richness) 21 (± 3) −0.9951 0.3336 0.0062 N1 (Exp(H)) 6.2080 (± 1.4133) −0.6369 0.5327 0.0081 N2 (1/Simpson’s) 4.3824 (± 1.0663) −1.2707 0.2210 0.0405 Evenness 0.5961 (± 0.0661) 0.5701 0.5761 0.0081 Family . Index . Mean (± SE) . t-value . P-value . R2 . Formicidae N0 (richness) 22 (± 2) −2.8959 0.0052* 0.0251 N1 (Exp(H)) 7.4992 (± 1.0230) −1.3891 0.1714 0.0036 N2 (1/Simpson’s) 4.7207 (± 0.7801) 1.6628 0.1030 0.0396 Evenness 0.6185 (± 0.0680) 0.4247 0.6730 0.1662 Carabidae N0 (richness) 35 (± 8) −1.2163 0.2305 0.0117 N1 (Exp(H)) 8.5004 (± 1.5735) −0.6862 0.4962 0.0059 N2 (1/Simpson’s) 6.3823 (± 1.7890) −0.6737 0.5041 0.0059 Evenness 0.3180 (± 0.0634) 1.5469 0.1292 0.0114 Scolytinae (literature) N0 (richness) 21 (± 3) −0.9951 0.3336 0.0062 N1 (Exp(H)) 6.2080 (± 1.4133) −0.6369 0.5327 0.0081 N2 (1/Simpson’s) 4.3824 (± 1.0663) −1.2707 0.2210 0.0405 Evenness 0.5961 (± 0.0661) 0.5701 0.5761 0.0081 *Significance. Open in new tab Table 2. Summary of statistical coefficients Family . Index . Mean (± SE) . t-value . P-value . R2 . Formicidae N0 (richness) 22 (± 2) −2.8959 0.0052* 0.0251 N1 (Exp(H)) 7.4992 (± 1.0230) −1.3891 0.1714 0.0036 N2 (1/Simpson’s) 4.7207 (± 0.7801) 1.6628 0.1030 0.0396 Evenness 0.6185 (± 0.0680) 0.4247 0.6730 0.1662 Carabidae N0 (richness) 35 (± 8) −1.2163 0.2305 0.0117 N1 (Exp(H)) 8.5004 (± 1.5735) −0.6862 0.4962 0.0059 N2 (1/Simpson’s) 6.3823 (± 1.7890) −0.6737 0.5041 0.0059 Evenness 0.3180 (± 0.0634) 1.5469 0.1292 0.0114 Scolytinae (literature) N0 (richness) 21 (± 3) −0.9951 0.3336 0.0062 N1 (Exp(H)) 6.2080 (± 1.4133) −0.6369 0.5327 0.0081 N2 (1/Simpson’s) 4.3824 (± 1.0663) −1.2707 0.2210 0.0405 Evenness 0.5961 (± 0.0661) 0.5701 0.5761 0.0081 Family . Index . Mean (± SE) . t-value . P-value . R2 . Formicidae N0 (richness) 22 (± 2) −2.8959 0.0052* 0.0251 N1 (Exp(H)) 7.4992 (± 1.0230) −1.3891 0.1714 0.0036 N2 (1/Simpson’s) 4.7207 (± 0.7801) 1.6628 0.1030 0.0396 Evenness 0.6185 (± 0.0680) 0.4247 0.6730 0.1662 Carabidae N0 (richness) 35 (± 8) −1.2163 0.2305 0.0117 N1 (Exp(H)) 8.5004 (± 1.5735) −0.6862 0.4962 0.0059 N2 (1/Simpson’s) 6.3823 (± 1.7890) −0.6737 0.5041 0.0059 Evenness 0.3180 (± 0.0634) 1.5469 0.1292 0.0114 Scolytinae (literature) N0 (richness) 21 (± 3) −0.9951 0.3336 0.0062 N1 (Exp(H)) 6.2080 (± 1.4133) −0.6369 0.5327 0.0081 N2 (1/Simpson’s) 4.3824 (± 1.0663) −1.2707 0.2210 0.0405 Evenness 0.5961 (± 0.0661) 0.5701 0.5761 0.0081 *Significance. Open in new tab Discussion We predicted that standard diversity metrics would be inversely correlated with the proportion of nonnative species, as is common in much of the invasive species literature (e.g., Simberloff 2005, Molnar et al. 2008, Pyšek and Richardson 2010, Clark and Seewagen 2019). However, we found no impact of nonnative species on most of the diversity metrics we examined. Instead, we found widely varying effects of invasion that were often unique to each diversity index and arthropod group. And, while statistically significant effects were not discernable for most groups and diversity measures, descriptive statistics did show some patterns. For instance, the ‘red alder’ site from Naumann and Higgins (2015) had the highest proportion of nonnative ants and the lowest value for all Hill numbers and evenness while Skvarla (2015) had the lowest proportion of nonnative ants and the highest species richness. The Naumann and Higgins (2015) ‘red alder’ site was one of three that had known populations of the invasive European fire ant (Myrmica rubra L., 1758), whereas the Skvarla (2015) data were collected in protected National Forest and National Park land in the Ozark Mountains, Arkansas. Several factors may contribute to our inconsistent results. While the random effect of ‘publication’ was not a significant factor in any model, targeted sampling of specific nonnatives within publications likely affected our results. Two of the 41 Carabidae publications (5%), 4 of the 20 Scolytinae publications (20%), and 11 of 25 Formicidae publications (44%) focused specifically on nonnative species. This is unsurprising because research focusing on an impactful invasive species likely has a greater chance of being supported than pure biodiversity work. This increase in focus on nonnative species corresponds to increasing effects on native confamilials. Time since invasion is another factor impacting the effects of nonnatives on native communities. While some species do have accurate and specific timelines for introduction (e.g., red imported fire ants were introduced in the 1940s; Tschinkel 2006), the specific introduction event for many species is not known or is unclear (e.g., redbay ambrosia beetle), and this prevented our use of ‘time since invasion’ as a reliable independent variable. Each of these studies is a snapshot of disturbance and species causing the most significant effects may be newer to their environment, thus causing rapid initial declines in native communities. Long-term ecological studies that follow invasions and the effects on native flora and fauna are necessary to answer these long-standing questions. Previous meta-analyses (e.g., Kenis et al. 2009, Cameron et al. 2016) suggest that invader trophic level significantly affects the directionality and size of nonnative impacts, and that increasing the number of nonnative species does not necessarily translate to an increase in effects on native diversity. For instance, the brown tree snake (Boiga irregularis (Merrem, 1802)) is a classic example of a single nonnative species which altered several ecological guilds in places where it has invaded (Wiles et al. 2003, Colvin et al. 2005, Rodda and Savidge 2007). Impacts of these magnitudes have been seen with some introduced arthropods (e.g., Davis et al. 2008, Herms and McCullough 2014, Nisbet et al. 2015), so the overall negative correlation between species richness and proportion of nonnative ants that we found makes sense. Landscape effects may also play a role in whether, and how, nonnative species affect natives. For example, studies that show significant negative impacts of nonnative ants on native ant species have mostly occurred on islands and have investigated species which are not yet present, or widespread, in North America. Future arrival of these species to the continent may change this relationship. One such example is Alluaud’s little yellow ant, Plagiolepis alluaudi Emery, 1894, which has recently established in southern Florida, and has already been implicated in the displacement of a native ant species in that area (Chouvenc et al. 2018). Other landscape effects like edge effects (e.g., Holway 2005) and patch size (e.g., Vercken et al. 2011) also affect how nonnatives impact native species through varying disturbance regimes or elevated densities of predators. Examples like these deserve long-term monitoring to determine how these effects may play out over time. Ecological niche—including feeding, spatial, and temporal partitioning—is also a factor in how nonnatives are received in their new environment. Nonnative arthropod generalist predators (AGPs) tend to have wide-ranging effects on native arthropods due to their complex trophic interactions. Because AGPs feed on herbivores, predators, detritivores, and sometimes plant material, they can negatively affect communities through consumptive and nonconsumptive effects. This leads to complex and unpredictable impacts on native communities (Snyder and Evans 2006). For example, many ants are omnivorous, feeding on a variety of plants and animal matter, including other arthropods, and this trait allows them to fill multiple niches, easily assimilate into many habitat types, and have multi-trophic effects by preying on, and competing with, other predators and herbivores (Crowder and Snyder 2010). Additionally, trophic position has a significant effect on both the size and directionality of impacts by nonnative species and, overall, increasing the number of nonnative species does not necessarily lead to an increase in their impacts on native diversity measures (Cameron et al. 2016). Determining the effects of one species is made more difficult due to intraguild predation which has been shown to dampen trophic cascades; therefore, knowing the composition of entire communities is necessary to determining the effects of one species on others (Finke and Denno 2004, Finke and Denno 2005). Spatial and temporal partitioning and stratification also likely play a role in the effects of nonnatives on native species. Compared with bark and ambrosia beetles and ground beetles (Wallin and Ekbom 1994) that travel great distances for food and hosts and occur individually or in small groups, ant colonies are fairly sessile and can consist of tens of thousands of individuals (e.g., Pedersen et al. 2006, Andersen 2008) in set locations, only moving when necessary (e.g., because of disturbance, death of the queen, or for mating). These characteristics may allow nonnative ants to have faster, and more intense, impacts on native arthropods compared with more motile nonnative species arthropods or those with specialized diets (e.g., Snyder and Evans 2006). Carabidae can fill multiple niches with some species being highly specialized (e.g., the Rhysodini tribe which feeds on ameboid stages of slime molds), some being omnivorous, and others predatory, and are known to travel great distances. Some of these characteristics may lead to a longer lag time between nonnative establishment and impacts on natives and their cumulative effects make it difficult to predict impacts based on family. An additional layer of complexity is that these spatial and temporal niches may shift over time and be affected by the introduction of a nonnative species. Much like the studies which look at overall effects of nonnative species on native diversity, there is a wide range of results when looking at shifts in temporal or spatial partitioning among closely associated species. Most of this work has been done on nonarthropod animals; for example, Harrington et al. (2009) showed that otters and polecats in the United Kingdom shifted their feeding behavior from nocturnal to diurnal in the presence of American mink, an established nonnative predator. Flowering phenology has also been shown to shift when nonnative species enter a naïve system, allowing the introduced plant species to reduce competition and fill a previously unfilled temporal niche (Godoy et al. 2009). Nonnative fish in China, however, showed no patterns of niche partitioning with native and nonnative goby fish overlapping in terms of diet and feeding activity (Guo et al. 2017). What literature exists for insects has mixed results, with both positive and negative associations, high turnover of native and nonnative species at varying locations, and significant seasonal variation in niche separation (e.g., Albrecht and Gotelli 2001, Coccia et al. 2016). Native species that are able to adapt with behavioral shifts, such as these will likely be less impacted by the establishment and spread of nonnative species. Finally, each species and publication objective necessitated a different sampling method and habitat type (Table 1). While ant sampling was highly variable among publications and included hand collecting, pitfall traps, baits, and leaf litter sifting, it was also the only group to show any statistical significance. Comparatively, ground beetle collections were largely consistent (pitfall traps in agricultural fields and forests) and did not show any significance among any diversity index measured. Bark and ambrosia beetle collections were also fairly consistent and consisted mostly of Lindgren funnel traps baited with various lure types and host volatiles, and yet, no significant correlation was found between diversity metrics and proportion of nonnative species. Our results demonstrate the complexity of nonnative species relationships with, and impacts on, native confamilial species. Other interactions are likely occurring such as the ‘Identity Effect’ which means that a single nonnative species may drive community changes while many others are able to co-exist without causing significant changes (e.g., Emery and Gross 2006). Ants in particular are known for their high levels of competitive exclusion and several studies have demonstrated dominance among certain nonnative ant species relative to native ant communities (Parr 2008, Arnan et al. 2018). This competitive exclusion may occur through competition for resources and interference with native ant foraging (e.g., Human and Gordon 1996) or may be a result of interactions with environmental and habitat factors (e.g., Philpott et al. 2010). The least frequently used sampling methods produced unsurprisingly extreme results for N0 and N1 and it is likely that additional sampling would eliminate this significance. The most commonly used sampling methods, Lindgren funnel traps and pitfalls, had the highest and lowest evenness measures, respectively. Considering that evenness and all Hill numbers were not significantly correlated with proportion of nonnatives for ground beetles or bark and ambrosia beetles, the differences in evenness and Hill numbers associated with sampling method and habitat are likely due to these human-related and environmental factors. Our results suggest that these complex interactions cannot adequately be assessed by relatively simple indices at the family or subfamily level, and thus, it is essential that research progresses beyond these standard measures of diversity to estimate impacts of nonnative species on native communities by assessing both taxonomic and functional diversity. These suggestions have been previously noted (e.g., Schlaepfer 2018) and our analyses support those conclusions. Using these indices may result in an underestimation of impacts to natives, potentially impacting management and conservation decisions. One issue with community assessment is the sheer volume of data and time required to do so. Further, baseline data for preinvasion diversity is often not available, so comparisons with ‘untouched’ systems may not be possible. Long-term datasets are key to answering these questions and mitigating future impacts by nonnative species. Within the invasion ecology community, researchers can and should work together to share data and revisit previously measured sites. Acknowledgments We thank authors that provided access to their datasets, and J.L. Orrock and E.I. Damschen (University of Wisconsin) and K.J.K. Gandhi (University of Georgia) for thoughtful discussions in the early stages of this project. We thank Dr. Carmen Blubaugh (University of Georgia) for significant contributions to statistical analyses and manuscript development. We also thank Dr. Michael Skvarla (Pennsylvania State University) for his thoughtful review of this manuscript before submission. We also thank three anonymous reviewers for their critiques. References Cited Albrecht , M. and N. J. Gotelli. 2001 . Spatial and temporal niche partitioning in grassland ants . Oecologia 126 : 134 – 141 . Google Scholar Crossref Search ADS PubMed WorldCat Andersen , A. N . 2008 . 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This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) TI - Comparative Meta-analysis Effects of Nonnative Ants (Hymenoptera: Formicidae), Ground Beetles (Coleoptera: Carabidae), and Bark and Ambrosia Beetles (Coleoptera: Curculionidae) on Native Confamilials JF - Environmental Entomology DO - 10.1093/ee/nvab017 DA - 2021-04-02 UR - https://www.deepdyve.com/lp/oxford-university-press/comparative-meta-analysis-effects-of-nonnative-ants-hymenoptera-vvkyg9X5g0 SP - 1 EP - 1 VL - Advance Article IS - DP - DeepDyve ER -