期刊
MARINE ECOLOGY PROGRESS SERIES
卷 677, 期 -, 页码 219-232出版社
INTER-RESEARCH
DOI: 10.3354/meps13871
关键词
Enhydra lutris; Foraging ecology; Marine mammal; Apex predator; C-13; N-15
资金
- National Science Foundation (NSF) [1600049]
- NSF Bio-Oce (Biological Oceanography) [1600230]
- National Oceanic and Atmospheric Administration
- National Marine Fisheries Service
- Auke Bay Laboratories (ABL)
- Earthwatch Institute
- Cooperative Institute for Alaska Research
- NOAA [NA13OAR4320056]
- University of Alaska
- BLaST at UAS - NIH Common Fund, through the Office of Strategic Coordination, Office of the NIH Director [TL4GM118992, RL5GM118990, UL1GM118991]
- Directorate For Geosciences
- Division Of Ocean Sciences [1600230, 1600049] Funding Source: National Science Foundation
Two complementary approaches were used to assess year-round variation in the diet of sea otters around Prince of Wales Island in Southeast Alaska, revealing that their diet is dominated by clams with minimal seasonal or locational shifts. While there is individual-level variation in sea otter diets, driven possibly by behavioral differences, these findings provide valuable information for the future management and conservation of this protected species.
Two complementary approaches were used to assess year-round variation in the diet of sea otters Enhydra lutris around Prince of Wales Island (POW) in southern Southeast Alaska, a region characterized by mixed-bottom habitat. We observed sea otters foraging to determine diet composition during the spring and summer. Then, we obtained sea otter vibrissae, which record temporal foraging patterns as they grow, from subsistence hunters to identify year-round changes in sea otter diets via stable isotope analysis of carbon (delta C-13) and nitrogen (delta N-15). We compared the stable isotopes from sea otter vibrissae and sea otter prey items that were collected during spring, summer, and winter. Overall, year-round sea otter diet estimates from stable isotope signatures and visual observations from spring and summer were dominated by clams in terms of biomass, with butter clams Saxidomus gigantea the most common clam species seen during visual observations. Our results indicate that these sea otters, when considered together at a regional level around POW, do not exhibit shifts in the main prey source by season or location. However, sea otter diets identified by stable isotopes had a strong individual-level variation. Behavioral variation among individual sea otters may be a primary driving factor in diet composition. This study provides quantitative diet composition data for modeling predictions of invertebrate population estimates that may aid in the future management of shelifisheries and subsistence hunting and the development of co-management strategies for this protected species.
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