ArticleScientific reports2018
Dietary divergence is associated with increased intra-specific competition in a marine predator.
Article in Scientific reports, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed.
- Multi-colony tracking of a marine central place forager reveals a site specific yet broadly consistent foraging strategy.Marine biology · 2026Article
- Niche partitioning and individual specialisation in resources and space use of sympatric fur seals at their range margin.Oecologia · 2024Article
- Molecular analyses of carangid fish diets reveal inter-predation, dietary overlap, and the importance of early life stages in trophic ecology.Ecology and evolution · 2024Article
- Possible niche compression and individual specialization in Pacific Arctic beluga (Ecology and evolution · 2023Article
- The role of context in elucidating drivers of animal movement.Ecology and evolution · 2022Review
- Ocean warming alters the distributional range, migratory timing, and spatial protections of an apex predator, the tiger shark (Galeocerdo cuvier).Global change biology · 2022Article
- Large-scale assessment of intra- and inter-annual breeding success using a remote camera network.Remote sensing in ecology and conservation · 2021Article
- Dietary complexity and hidden costs of prey switching in a generalist top predator.Ecology and evolution · 2020Article
- Niche partitioning of sympatric penguins by leapfrog foraging appears to be resilient to climate change.The Journal of animal ecology · 2019Article
Corrections and comments
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Optimal foraging theory predicts that when food is plentiful all individuals should take a small range of preferred prey types, but as competition increases less preferred prey will be included in the diet. This dietary switching may not be uniform among individuals, which produces discrete dietary clusters. We tested this hypothesis for gentoo penguins at Bird Island, South Georgia, using stable isotope analysis and biologging. Competition, in the form of the density of foraging dives, increased markedly from incubation to chick-rearing owing to increased foraging effort. Birds responded behaviourally by exploiting a greater portion of the available foraging radius and increasing dive depths. Dietary niche width doubled and two discrete dietary clusters appeared; one comprising birds that consumed mostly krill and another that ate a greater proportion of demersal fish. There were no differences in morphology between the dietary classes, but birds in the fish class had a tendency to dive deeper, which suggests a behavioural basis for specialization. Our findings are consistent with the hypothesis that intra-specific competition expands the population's dietary niche width and drives divergence in diets among individuals.
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