Changes in the feeding ecology of South American sea lions on the southern Brazilian coast over the last two decades of excessive fishing exploration

Changes in the feeding ecology of South American sea lions on the southern Brazilian coast over... In the last decades, an increasing fishing effort and a decreasing trend in fish catches have been observed in southern Brazil. Considering that marine mammals and fisheries usually compete for the same resources, it is reasonable to presume that the feeding ecology of these predators is affected by the current scenario. To evaluate this hypothesis, long-term variation in the diet of the South American sea lion (Otaria flavescens) relative to fisheries exploitation was analyzed for two periods (1993–2003 versus 2004–2014). The degree of overlap between the relative biomass of the sea lions’ diet and the target species of six types of local fishery was analyzed. An increase in prey overlap between sea lions and fisheries was observed in the more recent sampling period, along with an increase in prey diversity, richness, and niche breadth of the sea lions’ diet. These results suggest that the overfishing scenario could partly explain the modified feeding ecology of the sea lions. In this context, we recommend a review and better regulation of the current fishing effort in the region, which we believe will be an important step to maintain the fish stocks and minimize the impact of fishing on marine top predators. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hydrobiologia Springer Journals

Changes in the feeding ecology of South American sea lions on the southern Brazilian coast over the last two decades of excessive fishing exploration

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer International Publishing AG, part of Springer Nature
Subject
Life Sciences; Freshwater & Marine Ecology; Ecology; Zoology
ISSN
0018-8158
eISSN
1573-5117
DOI
10.1007/s10750-018-3618-8
Publisher site
See Article on Publisher Site

Abstract

In the last decades, an increasing fishing effort and a decreasing trend in fish catches have been observed in southern Brazil. Considering that marine mammals and fisheries usually compete for the same resources, it is reasonable to presume that the feeding ecology of these predators is affected by the current scenario. To evaluate this hypothesis, long-term variation in the diet of the South American sea lion (Otaria flavescens) relative to fisheries exploitation was analyzed for two periods (1993–2003 versus 2004–2014). The degree of overlap between the relative biomass of the sea lions’ diet and the target species of six types of local fishery was analyzed. An increase in prey overlap between sea lions and fisheries was observed in the more recent sampling period, along with an increase in prey diversity, richness, and niche breadth of the sea lions’ diet. These results suggest that the overfishing scenario could partly explain the modified feeding ecology of the sea lions. In this context, we recommend a review and better regulation of the current fishing effort in the region, which we believe will be an important step to maintain the fish stocks and minimize the impact of fishing on marine top predators.

Journal

Hydrobiologia – Springer Journals

Published: Apr 28, 2018

References

  • Do cranial suture age and growth layer groups correlate in South American pinnipeds?
    Audibert, P; Drehmer, CJ; Danilewicz, D; Oliveira, LR
  • Mamiferos Acuaticos de Sudamerica y Antartida
    Bastida, R; Rodríguez, D; Secchi, E; Silva, V
  • Atividade pesqueira da frota de média escala no extremo sul do Brasil
    Boffo, MS; Reis, EG
  • Sexual segregation of seasonal foraging habitats in a non-migratory marine mammal
    Breed, GA; Bowen, WD; McMillan, JI; Leonard, ML
  • Feeding ecology of the Common Tern Sterna hirundo in a wintering area in southern Brazil
    Bugoni, L; Vooren, CM
  • The diet of the South American sea lion (Otaria flavescens) at Río Negro, Patagonia, Argentina, during the winter–spring period
    Bustos, R; Daneri, G; Volpedo, A; Harrington, A; Varela, E
  • Movements and location at sea of South American sea lions (Otaria flavescens)
    Campagna, C; Werner, R; Karesh, W; Marin, MR; Koontz, F; Cook, F; Koontz, C
  • Caracterização tecnológica, social, econômica e ecológica da atividade pesqueira sediada em Passo de Torres, Santa Catarina, Brasil
    Cardoso, LG; Haimovici, M
  • Peixes: Costa Brasileira
    Carvalho-Filho, A
  • Temporal variation in western Hudson Bay ringed seal Phoca hispida diet in relation to environment
    Chambellant, M; Stirling, I; Ferguson, SH
  • Coverage-based rarefaction and extrapolation: standardizing samples by completeness rather than size
    Chao, A; Jost, L
  • Entropy and the species accumulation curve: A novel estimator of entropy via discovery rates of new species
    Chao, A; Wang, YT; Jost, L
  • Diet of Black-browed Thalassarche melanophris and Atlantic Yellow-nosed T. chlororhynchos Albatrosses and White-chinned Procellaria aequinoctialis and Spectacled P. conspicillata Petrels off southern Brazil
    Colabuono, FI; Vooren, CM
  • A critical review of methods of studying fish feeding based on analysis of stomach contents: application to elasmobranch fishes
    Cortés, EA
  • Standardized diet compositions and trophic levels of sharks
    Cortés, EA
  • Chave ilustrada para identificação dos camarões Dendrobranchiata do litoral norte do estado de São Paulo, Brasil
    Costa, RC; Fransozo, CA; Melo, GAS; Freire, FAM
  • Statistics: an introduction using R
    Crawley, MJ
  • Current status of the South American sea lion along the distribution range
    Crespo, EA; Oliva, D; Dans, SL; Sepúlveda, M
  • Marine mammals: Fisheries; tourism and management issues
    Dans, SL; Koen-Alonso, M; Crespo, EA; Pedraza, SN; García, NA
  • Ontogenic dietary changes in South American sea lions
    Drago, M; Cardona, L; Crespo, EA; Aguilar, A
  • Historic diet change of the South American sea lion in Patagonia as revealed by isotopic analysis
    Drago, M; Crespo, EA; Aguilar, A; Cardona, L; García, N; Dans, SL; Goodall, N
  • Reduction of skull size in South American sea lions reveals density-dependent growth during population recovery
    Drago, M; Cardona, L; Crespo, EA; Grandi, MF; Aguilar, A
  • Sexual foraging segregation in South American sea lions increases during the pre-breeding period in the Río de la Plata plume
    Drago, M; Franco-Trecu, V; Zenteno, L; Szteren, D; Crespo, EA; Riet-Sapriza, FGR; Oliveira, L; Machado, R; Inchausti, P; Cardona, L
  • Perceptions and attitudes of stakeholders towards the wildlife refuge of Ilha dos Lobos, a marine protected area in Brazil
    Engel, MT; Marchini, S; Pont, AC; Machado, R; Oliveira, LR
  • Modeling in natural resource management: Development, Interpretation, and application
    Franklin, AB; Shenk, TM; Anderson, DR; Burnham, KP
  • What catch data can tell us about the status of global fisheries
    Froese, R; Zeller, D; Kleisner, K; Pauly, D
  • Feeding ecology of the South American sea lion Otaria flavescens: food contents and food selectivity
    George-Nascimento, M; Bustamante, R; Oyarzu, NC
  • Growth and age at sexual maturity of South American sea lions
    Grandi, MF; Dans, SL; Gracia, NA; Crespo, EA
  • Present state and perspectives for the southern Brazil shelf demersal fisheries
    Haimovici, M
  • Coastal cephalopod fauna of Southern Brazil
    Haimovici, M; Perez, JAA
  • Long-term changes in the fisheries in the Patos Lagoon estuary and adjacent coastal waters in Southern Brazil
    Haimovici, M; Cardoso, LG
  • Distribuição e abundancia de peixes teleósteos demersais sobre a plataforma continental do sul do Brasil
    Haimovici, M; Martins, AS; Vieira, PC
  • Stomach contents analysis - a review of methods and their application
    Hyslop, EJ
  • Ontogeny of diving behaviour in the Galápagos fur seal
    Horning, M; Trillmich, F
  • Ecological effects of El Niño in terrestrial ecosystems of western South America
    Jaksic, FM
  • Food habits of the South American sea lion, Otaria flavescens, off Patagonia, Argentina
    Koen-Alonso, M; Crespo, EA; Pedraza, SN
  • Ecological methodology
    Krebs, CJ
  • Diving behavior of juvenile northern elephant seals
    Boeuf, BJ; Morris, PA; Blackwell, SB; Crocker, DE; Costa, DP
  • Sex-specific foraging strategies and resource partitioning in the southern elephant seal (Mirounga leonina)
    Lewis, R; O’Connell, TC; Lewis, M; Campagna, C; Hoelzel, AR
  • Incidental catch of South American sea lion in a pair trawl off southern Brazil
    Machado, R; Oliveira, LR; Montealegre-Quijano, S
  • Operational interactions between South American sea lions and gillnet fishing in southern Brazil
    Machado, R; Ott, PH; Moreno, IB; Danilewicz, D; Tavares, M; Crespo, HA; Siciliano, S; Oliveira, LR
  • Geographical Ecology: patterns in the distribution of species
    MacArthur, RH
  • Seasonal mesoscale shifts of demersal nekton assemblages in the subtropical South-western Atlantic
    Martins, AS; Haimovici, M
  • Feeding ecology of the common bottlenose dolphin, Tursiops truncatus, in southern Brazil: analyzing its prey and the potential overlap with fisheries
    Milmann, L; Danilewicz, D; Machado, R; Santos, RA; Ott, PH
  • Descrição da pesca costeira de média escala no litoral norte do Rio Grande do Sul: comunidades pesqueiras de Imbé/Tramandaí e Passo de Torres/Torres
    Moreno, IB; Tavares, M; Danilewicz, D; Ott, PH; Machado, R
  • Análisis preliminar de la dieta del león marino del sur (Otaria flavescens) en Isla de Lobos, Uruguay
    Naya, DE; Vargas, R; Arim, M
  • Standardized methods for measuring and recording data on the smaller cetaceans
    Norris, KS
  • Ecologia de mamíferos
    Oliveira, LR; Ott, PH; Malabarba, LR
  • Ancient female philopatry, asymmetric male gene flow, and synchronous population expansion support the influence of climatic oscillations on the evolution of South American sea lion (Otaria flavescens)
    Oliveira, LR; Gehara, MCM; Fraga, LD; Lopes, F; Túnez, JI; Cassini, MH; Majluf, P; Cárdenas-Alayza, S; Pavés, HJ; Crespos, EA; García, N; Castro, RL; Hoelzel, AR; Sepúlveda, M; Olavarría, C; Valiati, VH; Quiñones, R; Pérez-Alvarez, MJ; Ott, PH; Bonatto, SL
  • Bases para la conservación y el manejo de la costa uruguaya
    Páez, H
  • Catch reconstructions reveal that global marine fisheries catches are higher than reported and declining
    Pauly, D; Zeller, D
  • Comments on FAOs State of World Fisheries and Aquaculture (SOFIA 2016)
    Pauly, D; Zeller, D
  • Diet composition and trophic levels of marine mammals
    Pauly, D; Trites, AW; Capuli, E; Christensen, V
  • Towards sustainability in world sheries
    Pauly, D; Christensen, V; Guénette, S; Pitcher, TJ; Sumaila, UR; Walters, CJ; Watson, R; Zeller, D
  • Occupancy dynamics of South American Sea-Lions in Brazilian Haul-outs
    Pavanato, H; Silva, KG; Estima, SC; Monteiro, DS; Kinas, PG
  • Evolutionary ecology
    Pianka, ER
  • Ocorrência de pinípedes na costa brasileira
    Pinedo, MC
  • Food habits of albacore, bluefin tuna and bonito in California waters
    Pinkas, L; Oliphant, MS; Iverson, ILK
  • The human dimension of the conflict between fishermen and South American sea lions in southern Brazil
    Pont, AC; Marchini, S; Engel, MT; Machado, R; Ott, PH; Crespo, EA; Coscarella, M; Dalzochio, MS; Oliveira, LR
  • Stomach contents of harbour porpoises, Phocoena phocoena (L.), from the Bay of Fundy
    Recchia, CA; Read, AJ
  • First observation of operational interactions between bottom trawling fisheries and South American sea lion, Otaria flavescens in south-central Chile
    Reyes, P; Hucke-Gaete, R; Torres-Florez, JP
  • Foraging behavior of lactating South American sea lions, Otaria flavescens and spatial-resource overlap with the Uruguayan fisheries
    Riet-Sapriza, FG; Costa, DP; Franco-Trecu, V; Marín, Y; Chocca, J; González, B; Beathyate, G; Louise Chilvers, B; Hückstadt, LA
  • Sea Lions of the World
    Rodríguez, D; Bastida, R; Calkins, DG; Davis, RW
  • Foraging strategies of Southern sea lion females in the La Plata River Estuary (Argentina–Uruguay)
    Rodríguez, DH; Dassis, M; Ponce de León, A; Barreiro, C; Farenga, M; Bastida, RO; Davis, RW
  • Solapamiento trofico entre el lobo marino de un pelo Otaria flavescens y la pesqueria de arrastre demersal del golfo San Matias, Patagonia, Argentina
    Romero, MA; Dans, S; Gonzalez, R; Svendsen, G; Garcia, N; Crespo, E
  • Seasonal movements of the South American sea lion (Otaria flavescens, Shaw) off the Rio Grande do Sul coast, Brazil
    Rosas, FCW; Pinedo, MC; Marmontel, M; Haimovici, M
  • Atlas of marine bony fish otoliths (sagittae) of southeastern-southern Brazil Part I: Gadiformes (Macrouridae, Moridae, Bregmacerotidae, Phycidae and Merlucciidae); Part II: Perciformes (Carangidae, Sciaenidae, Scombridae and Serranidae)
    Rossi-Wongtschowski, CLB; Siliprandi, CC; Brenha, MR; Gonsales, SA; Santificetur, C; Vaz-Dos-Santos, AM
  • Ocupação sazonal por duas espécies de Otariidae (Mammalia, Carnivora) da Reserva Ecológica Ilha dos Lobos, Rio Grande do Sul, Brasil
    Sanfelice, D; Vasques, VC; Crespo, EA
  • Non-synchronous spatial overlap of lizards in patchy habitats
    Schoener, TW
  • Theory of feeding strategies
    Schoener, TW
  • Os Ecossistemas Costeiro e Marinho do Extremo Sul do Brasil
    Seeliger, U; Odebrecht, C
  • Marine Mammals: Fisheries, Tourism and Management Issues
    Secchi, ER; Ott, PH; Danilewicz, DS
  • Long-term and gender-related variation in the feeding ecology of common bottlenose dolphins inhabiting a subtropical estuary and the adjacent marine coast in western South Atlantic
    Secchi, ER; Botta, S; Weigand, MM; Lopes, LA; Fruet, PF; Genoves, RC; Tullio, J
  • Operational interactions between South American sea lions Otaria flavescens and artisanal (small-scale) fishing in Chile: results from interview surveys and on-board observations
    Sepúlveda, M; Perez, MJ; Sielfed, W; Oliva, D; Durán, LR; Rodríguez, L; Araos, V; Buscaglia, M
  • Foraging Theory
    Stephens, DW; Krebs, JR
  • Predation by southern sea lions (Otaria flavescens) on artisanal fishing catches in Uruguay
    Szteren, D; Páez, E
  • Overlap between pinniped summer diet and artisanal fishery catches in Uruguay
    Szteren, D; Naya, D; Arims, M
  • Predation of Otaria flavescens over artisanal fisheries in Uruguay: opportunism or prey selectivity?
    Szteren, D
  • Foraging behaviour and diet of lactating female southern sea lions (Otaria flavescens) in the Falkland Islands
    Thompson, D; Duck, CD; McConnell, BJ; Garrett, J
  • The decline of Steller sea lions Eumetopias jubatus in Alaska: a review of the nutritional stress hypothesis
    Trites, AW; Donnelly, CP
  • Otaria flavescens (Shaw), South American sea lion. Mammals of the seas: small cetaceans, seals, sirenians and otters
    Vaz-Ferreira, R
  • Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
    Zenteno, L; Crespo, E; Vales, D; Silva, L; Saporiti, F; Oliveira, LR; Secchi, ER; Drago, M; Aguilar, A; Cardona, L

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