Resource partitioning by sympatric Steller sea lions and northern fur seals as revealed by biochemical dietary analyses and satellite telemetry

Waite, Jason N.; Trumble, Stephen J.; Burkanov, Vladimir N.; Andrews, Russel D.

doi:10.1016/j.jembe.2012.02.009

Cited by 30 publications

(32 citation statements)

References 88 publications

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“…In this study, results from hard-parts and DNA analyses of prey in scats were in general agreement and confirmed that animals breeding on the Pribilof Islands mostly feed on a set of species comprising mainly walleye pollock, salmon, and forage fish including hexagrammids (Sinclair et al 1994, Gudmundson et al 2006, Waite et al 2012). This consistency between the 2 methods was also shown for harbour seals and Steller sea lions at the population level (only species of minor importance differed between methods; Tollit et al 2009), which indicates that major errors or omissions are unlikely in diet estimates.…”

Section: Discussionsupporting

confidence: 81%

Combining hard-part and DNA analyses of scats with biologging and stable isotopes can reveal different diet compositions and feeding strategies within a fur seal population

Jeanniard‐du‐Dot¹,

Thomas²,

Cherel³

et al. 2017

Mar. Ecol. Prog. Ser.

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Section: Discussionsupporting

confidence: 81%

Combining hard-part and DNA analyses of scats with biologging and stable isotopes can reveal different diet compositions and feeding strategies within a fur seal population

Jeanniard‐du‐Dot¹,

Thomas²,

Cherel³

et al. 2017

Mar. Ecol. Prog. Ser.

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“…; Waite et al . ). Juvenile foraging habitat selection in our study is not confounded by differential habitat accessibility.…”

Section: Discussionmentioning

confidence: 97%

“…; Waite et al . ). This precludes direct competition between adults as a possible cause for differences in population numbers.…”

Section: Introductionmentioning

confidence: 97%

Same size – same niche? Foraging niche separation between sympatric juvenile Galapagos sea lions and adult Galapagos fur seals

Jeglinski

Goetz

Werner

et al. 2013

Journal of Animal Ecology

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Summary 1.In vertebrates, patterns of resource utilization change throughout development according to age-and or size-specific abilities and requirements. Thus, interspecific competition affects different age classes differently. 2. Adults of sympatric species often show distinct foraging niche segregation, but juvenile resource use might overlap with adult competitors of similar body size. Resultant negative effects on juveniles can have important consequences for population dynamics, yet such interactions have received little attention in studies of mammalian communities. 3. Using GPS tracking devices, time-depth recorders and stable isotope data, we compared diving depth, activity time, trophic position and foraging habitat characteristics to investigate foraging niche overlap between similar-sized sympatric juvenile Galapagos sea lions (Zalophus wollebaeki) and adult Galapagos fur seals (Arctocephalus galapagoensis) and compared each group with much larger-bodied adult Galapagos sea lions. 4. We found little indication for direct competition but a complex pattern of foraging niche segregation: juvenile sea lions and adult fur seals dived to shallow depths at night, but foraged in different habitats with limited spatial overlap. Conversely, juvenile and adult sea lions employed different foraging patterns, but their foraging areas overlapped almost completely. 5. Consistency of foraging habitat characteristics between juvenile and adult sea lions suggests that avoidance of competition may be important in shaping foraging habitat utilization. Resultant specialization on a limited habitat could contribute to low sea lion numbers that contrast with high fur seal abundance. Our data suggest that exploitation by multiple predators within spatially restricted foraging ranges of juveniles might negatively impact juvenile foraging success and ultimately influence population dynamics.

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“…Moreover, it can permit a retrospective view of a population's movement patterns and trophic dynamics to examine the effects of climate-and human-induced change. Biochemical tracers combined with telemetry have documented resource partitioning among eared seals (87), detected trophic linkages among alligators (88), and characterized the effects of tourism-related provisioning (i.e., baiting sharks into areas where divers can view them) on reef sharks (89). Telemetry coupled with genetics and/or genomics and biochemical tracers provides cutting-edge opportunities to examine the effects, roles, and evolutionary successes of invasive, commercial, and imperilled species.…”

Section: Integrating Telemetry With Other Biological Measuresmentioning

confidence: 99%

Aquatic animal telemetry: A panoramic window into the underwater world

Hussey

Kessel

Aarestrup

et al. 2015

Science

1,110

973

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BACKGROUND:Global aquatic environments are changing profoundly as a result of human actions; consequently, so too are the ways in which organisms are distributing themselves through space and time. Our ability to predict organism and community responses to these alterations will be dependent on knowledge of animal movements, interactions, and how the physiological and environmental processes underlying them shape species distributions. These patterns and processes ultimately structure aquatic ecosystems and provide the wealth of ecosystem services upon which humans depend. Until recently, the vast size, opacity, and dynamic nature of the aquatic realm have impeded our efforts to understand these ecosystems. With rapid technological advancement over the past several decades, a suite of electronic tracking devices (e.g., acoustic and satellite transmitters) that can remotely monitor animals in these challenging environments are now available. Aquatic telemetry technology is rapidly accelerating our ability to observe animal behavior and distribution and, as a consequence, is fundamentally altering our understanding of the structure and function of global aquatic ecosystems. These advances provide the toolbox to define how future global aquatic management practices must evolve.

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Resource partitioning by sympatric Steller sea lions and northern fur seals as revealed by biochemical dietary analyses and satellite telemetry

Cited by 30 publications

References 88 publications

Combining hard-part and DNA analyses of scats with biologging and stable isotopes can reveal different diet compositions and feeding strategies within a fur seal population

Combining hard-part and DNA analyses of scats with biologging and stable isotopes can reveal different diet compositions and feeding strategies within a fur seal population

Same size – same niche? Foraging niche separation between sympatric juvenile Galapagos sea lions and adult Galapagos fur seals

Aquatic animal telemetry: A panoramic window into the underwater world

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