| Autor: |
Erin U. Rechsteiner, Jane C. Watson, M. Tim Tinker, Linda M. Nichol, Matthew J. Morgan Henderson, Christie J. McMillan, Mike DeRoos, Marie C. Fournier, Anne K. Salomon, Leah D. Honka, Chris T. Darimont |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Ecology and Evolution, Vol 9, Iss 6, Pp 3321-3334 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2045-7758 |
| DOI: |
10.1002/ece3.4953 |
| Popis: |
Abstract Predators exert strong effects on ecological communities, particularly when they re‐occupy areas after decades of extirpation. Within species, such effects can vary over time and by sex and cascade across trophic levels. We used a space‐for‐time substitution to make foraging observations of sea otters (Enhydra lutris) across a gradient of reoccupation time (1–30 years), and nonmetric multidimensional scaling (nMDS) analysis to ask whether (a) sea otter niche space varies as a function of occupation time and (b) whether niche space varies by sex. We found that niche space varied among areas of different occupation times. Dietary niches at short occupation times were dominated by urchins (Mesocentrotus and Strongylocentrotus spp; >60% of diets) in open habitats at 10–40 m depths. At longer occupation times, niches were dominated by small clams (Veneroida; >30% diet), mussels (Mytilus spp; >20% diet), and crab (Decapoda; >10% diet) in shallow (60%), and urchins (~25%) from deep waters (>40 m), and females and territorial males consuming smaller, varied prey from shallow waters ( |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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