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SADIE (Spatial Analysis by Distance IndicEs) is a new methodology to detect and measure the degree of nonrandomness in the two-dimensional spatial patterns of populations. It applies the same principles to data in the form of maps as to data in the form of counts at specified locations, but with...
It has been hypothesized that flooding, interacting with light availability, can determine spatial patterns of tree regeneration by causing differential germination or survival among seedlings in river floodplains. We conducted a canonical correspondence analysis (CCA, a form of direct gradient...
Gypsy moth defoliation of oak trees has been shown to lead to increased tannin levels, which, in turn, lead to reduced gypsy moth growth and fecundity. In laboratory experiments, increased tannin levels can interfere with the transmission of a virus that is consumed by larvae on oak foliage, and...
A critical step in understanding food webs and trophic dynamics of communities is quantification of the role of the primary consumers, and a major aspect of such quantification is determination of their production. Annual production and biomass turnover were estimated for the larval chironomid...
We analyzed how the distribution and abundance of a major consumer, the coyote ( Canis latrans ) is influenced by the input of food from the sea. In the arid deserts of Baja California, coyote abundance along the shore of the Gulf of California is much higher compared to adjacent inland areas....
This study identifies patterns in the gap disturbance regime along a successional gradient in the southern boreal forest and uses this information to investigate canopy composition changes. Gaps were characterized in hardwood, mixed-forest, and conifer stands surrounding Lake Duparquet in...
Local species richness is a function of many factors operating at multiple spatial and temporal scales. We examined stream fish communities from regions throughout Virginia to assess (1) the relative influence of local vs. regional factors on local species richness, (2) evidence for community...
Estimating species richness (i.e., the actual number of species present in a given area) is a basic objective of many field studies carried out in community ecology and is also of crucial concern when dealing with the conservation and management of biodiversity. In most studies, the total number...
We analyzed three models of tritrophic interactions among hosts, parasitoids, and hyperparasitoids. In their deterministic versions, all models can produce dynamics in the form of a torus, in which there are both short-term cycles and long-term cycles of tens or hundreds of generations. To...
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