Long‐term individual foraging site fidelity—why some gannets don't change their spots DOI
Ewan D. Wakefield, Ian R. Cleasby, Stuart Bearhop

et al.

Ecology, Journal Year: 2015, Volume and Issue: 96(11), P. 3058 - 3074

Published: Nov. 1, 2015

Many established models of animal foraging assume that individuals are ecologically equivalent. However, it is increasingly recognized populations may comprise who differ consistently in their diets and behaviors. For example, recent studies have shown individual site fidelity (IFSF, when forage only a small part population's home range) occurs some colonial breeders. Short‐term IFSF could result from animals using win–stay, lose–shift strategy. Alternatively, be consequence specialization. Pelagic seabirds central‐place foragers, classically assumed to use flexible strategies target widely dispersed, spatiotemporally patchy prey. tracking has many seabirds, although not known whether this persists across years. To test for long‐term examine alternative hypotheses concerning its cause, we repeatedly tracked 55 Northern Gannets ( Morus bassanus ) large colony the North Sea within three successive breeding seasons. foraged neritic waters, predictably structured by tidal mixing thermal stratification, but subject stochastic, wind‐induced overturning. Both years, coarse mesoscale (tens kilometers) was significant absolute, birds departed individually consistent directions. Carbon stable isotope ratios gannet blood tissues were repeatable years nitrogen also suggesting dietary Individuals habitat with respect relative sea surface temperature dive metrics, yet none these factors accounted IFSF. Moreover, at scale weeks, did decay over time magnitude similar primarily foraging. Rather, hypothesize familiarity, accrued early life, causes canalizing subsequent decisions. Evidence other suggests common far‐reaching consequences our attempts understand conserve rapidly changing environment.

Language: Английский

Structure and mechanism of diet specialisation: testing models of individual variation in resource use with sea otters DOI
M. Tim Tinker, Paulo R. Guimarães, Márk Novák

et al.

Ecology Letters, Journal Year: 2012, Volume and Issue: 15(5), P. 475 - 483

Published: March 14, 2012

Studies of consumer-resource interactions suggest that individual diet specialisation is empirically widespread and theoretically important to the organisation dynamics populations communities. We used weighted networks analyze resource use by sea otters, testing three alternative models for how may arise. As expected, was absent when otter density low, but increased at high-otter density. A high-density emergence nested resource-use consistent with model assuming individuals share preference ranks. However, a density-dependent non-nested modular network 'core' resources more 'competitive refuge' model. Individuals from different modules showed predictable variation in rank-order prey preferences handling times core resources, further supporting competitive refuge Our findings support hierarchical marginal be driven selective pressures.

Language: Английский

Citations

192
Social niche specialization under constraints: personality, social interactions and environmental heterogeneity DOI Open Access
Pierre‐Olivier Montiglio, Caterina Ferrari, Denis Réale

et al.

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2013, Volume and Issue: 368(1618), P. 20120343 - 20120343

Published: April 9, 2013

Several personality traits are mainly expressed in a social context, and others, which not restricted to can be affected by the interactions with conspecifics. In this paper, we focus on recently proposed hypothesis that niche specialization (i.e. individuals population occupy different roles) explain maintenance of individual differences personality. We first present ecological hypotheses. particular, show how quantified highlight link between specialization. then review some factors (e.g. competition environmental heterogeneity) mechanisms frequency-dependent, state-dependent awareness) may associated evolution differences. Finally, conceptual model methods quantify contribution dynamics roles. doing so, suggest series research objectives help empirical advances area. Throughout studies mammals, where available.

Language: Английский

Citations

187
Characterizing trophic ecology of generalist consumers: a case study of the invasive lionfish in The Bahamas DOI Open Access

CA Layman,

J. Allgeier

Marine Ecology Progress Series, Journal Year: 2011, Volume and Issue: 448, P. 131 - 141

Published: Nov. 23, 2011

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 448:131-141 (2012) - DOI: https://doi.org/10.3354/meps09511 Characterizing trophic ecology of generalist consumers: a case study invasive lionfish in The Bahamas Craig A. Layman1,*, Jacob E. Allgeier2 1Marine Sciences Program, Florida International University, 3000 N.E. 151st St., North Miami, 33181, USA 2Odum School Ecology, University Georgia, Athens, Georgia 30602, *Email: [email protected] ABSTRACT: Population sizes consumers are increasing many ecosystems because various human activities, and it is critical understand role these species if we predict how they may affect food web structure ecosystem function. Lionfish Pterois volitans/miles have spread throughout Western Atlantic Gulf Mexico significant effects on native faunal communities. We characterized back reef habitats Abaco Island, Bahamas, drawing recently developed analytical tools that employ both direct diet information stable isotope data. Although δ15N δ13C bi-plot data appeared suggest substantial niche overlap with gray snapper schoolmaster snapper, Bayesian suggested differences core isotopic niches among species. This was consistent information, as fed almost exclusively small prey fishes more commonly crustaceans. When combining empirical simulation model, individual appear be specialized their diets than snapper. this pattern driven by high site-fidelity lionfish, conjunction distinct assemblages at patch scale. widely considered predators, reveal aspects generality must invaded continues examined. KEY WORDS: Food · Individual specialization Invasive Optimal foraging Predator-prey interaction volitans miles Full text pdf format PreviousNextCite article as: Layman CA, Allgeier JE Bahamas. Mar Ecol Prog Ser 448:131-141. Export citation Tweet linkedIn Cited Published Vol. 448. Online publication date: February 23, 2012 Print ISSN: 0171-8630; 1616-1599 Copyright © Inter-Research.

Language: Английский

Citations

178
Individual variation in anthropogenic resource use in an urban carnivore DOI
Seth D. Newsome,

Heidi M. Garbe,

Evan C. Wilson

et al.

Oecologia, Journal Year: 2015, Volume and Issue: 178(1), P. 115 - 128

Published: Feb. 11, 2015

Language: Английский

Citations

167
Long‐term individual foraging site fidelity—why some gannets don't change their spots DOI
Ewan D. Wakefield, Ian R. Cleasby, Stuart Bearhop

et al.

Ecology, Journal Year: 2015, Volume and Issue: 96(11), P. 3058 - 3074

Published: Nov. 1, 2015

Many established models of animal foraging assume that individuals are ecologically equivalent. However, it is increasingly recognized populations may comprise who differ consistently in their diets and behaviors. For example, recent studies have shown individual site fidelity (IFSF, when forage only a small part population's home range) occurs some colonial breeders. Short‐term IFSF could result from animals using win–stay, lose–shift strategy. Alternatively, be consequence specialization. Pelagic seabirds central‐place foragers, classically assumed to use flexible strategies target widely dispersed, spatiotemporally patchy prey. tracking has many seabirds, although not known whether this persists across years. To test for long‐term examine alternative hypotheses concerning its cause, we repeatedly tracked 55 Northern Gannets ( Morus bassanus ) large colony the North Sea within three successive breeding seasons. foraged neritic waters, predictably structured by tidal mixing thermal stratification, but subject stochastic, wind‐induced overturning. Both years, coarse mesoscale (tens kilometers) was significant absolute, birds departed individually consistent directions. Carbon stable isotope ratios gannet blood tissues were repeatable years nitrogen also suggesting dietary Individuals habitat with respect relative sea surface temperature dive metrics, yet none these factors accounted IFSF. Moreover, at scale weeks, did decay over time magnitude similar primarily foraging. Rather, hypothesize familiarity, accrued early life, causes canalizing subsequent decisions. Evidence other suggests common far‐reaching consequences our attempts understand conserve rapidly changing environment.

Language: Английский

Citations

162