2018
DOI: 10.3354/meps12471
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Variability in trophic level and habitat use in response to environmental forcing: isotopic niche dynamics of breeding seabirds in the southeastern Bering Sea

Abstract: Climate-driven changes in the marine environment may affect inter-and intraspecific resource partitioning by marine organisms. When and how resources are partitioned may depend on access to diverse foraging habitats. Here we examined the variability in the isotopic niche of breeding seabirds with respect to trophic level and habitat use in years with cold and warm sea temperatures in the Bering Sea. Between 1999 and 2015 (n = 12 yr), we collected blood from blacklegged kittiwakes Rissa tridactyla, and common U… Show more

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Cited by 14 publications
(5 citation statements)
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“…How animals respond to changing environmental conditions is a key topic in movement and foraging ecology. Mobile predators may potentially respond to changes in prey availability by moving to find new resources or switching diets [1, 11, 42, 43, 45, 50, 70]. The nature of any such response reflects a balance of risk/reward associated with resource intake, energetic costs and physiological demands.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…How animals respond to changing environmental conditions is a key topic in movement and foraging ecology. Mobile predators may potentially respond to changes in prey availability by moving to find new resources or switching diets [1, 11, 42, 43, 45, 50, 70]. The nature of any such response reflects a balance of risk/reward associated with resource intake, energetic costs and physiological demands.…”
Section: Introductionmentioning
confidence: 99%
“…Like many other seabirds, annual survival rates of adult auks are typically high ( c. 0.90) with most mortality occurring in winter [28]. Ecological and environmental conditions during winter moult therefore have the potential to influence the distribution, behaviour and mortality of seabirds, but the majority of studies on environmental influences on diet and distributions of seabirds have focussed on impacts during the breeding season [30, 54, 70]. Considerably less information is available regarding changes occurring outside the breeding season.…”
Section: Introductionmentioning
confidence: 99%
“…Direct studies of this mechanism in seabirds are rare. However, three species of seabirds breeding in the southeastern Bering Sea shifted their dietary niche in response to changing environmental conditions, measured using sea temperatures, and this shift was mediated by their ability to access spatially heterogeneous foraging habitats (Kokubun et al, 2018 ; Will & Kitaysky, 2018 ). Foraging habitat variation does, therefore, appear to be a valid mechanism allowing breeding seabirds to exploit changing prey availability in relation to climatically driven oceanographic changes, and to potentially buffer against periods of low food availability through access to diverse habitats and spatial variation in forage resources.…”
Section: Discussionmentioning
confidence: 99%
“…Head feathers were washed in a 2:1 chloroform methanol solution, cut into small pieces, and packed in tin capsules. Samples were analyzed either at the Light Stable Isotope Lab at the University of California Santa Cruz (2011) or at the University of Alaska Fairbanks Stable Isotope Facility (UAF 2014–17). , The two laboratories were comparable . Stable isotope ratios are reported in delta notation as parts per thousand (‰) relative to the international standard δ 15 N air as follows: δ 15 N = [( R sample / R standard ) – 1] ‰, where R is the corresponding ratio of 15 N/ 14 N. Internal standards pugel (UCSC) and pepton (UAF) were within ±0.01‰.…”
Section: Methodsmentioning
confidence: 99%