Fatty acid analysis as a tool to infer the diet in Illinois river otters (Lontra canadensis)
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Fatty acids (FA) have recently been used in several studies to infer the diet in a number of species. While thesestudies have been largely successful, most have dealt with predators that have a fairly specialized diet. In this paper,we used FA analysis as a tool to infer the diet of the nearctic river otter (Lontra canadensis). The river otter is anopportunistic predator known to subsist on a wide variety of prey including, fishes, crayfish, molluscs, reptiles andamphibians, among others. We analyzed the principle components of 60 FA from otters and 25 potential preyspecies in Illinois, USA. Prey species came from 4 major taxonomic divisions: fishes, crayfish, molluscs andamphibians. Within each division, most, but not all, species had significantly different profiles. Using quantitative FAsignature analysis, our results suggest that, by mass, fish species are the most significant component of Illinois Riverotters’ diet (37.7 ± 1.0%). Molluscs ranked second (32.0 ± 0.8%), followed by amphibians (27.3 ± 4.3%), and finally,crayfish (3.0 ± 0.6%). Our analysis indicates that molluscs make up a larger portion of the otter diet than previouslyreported. Throughout much of the Midwest there have been numerous otter reintroduction efforts, many of whichappear to be successful. In regions where mollusc species are endangered, these data are essential formanagement agencies to better understand the potential impact of otters on these species. Our analysis furthersuggests that quantitative FA signature analysis can be used to infer diet even when prey species are diverse, tothe extent that their FA profiles differ. Better understanding of the otter’s metabolism of FA would improveinferences of diet from FA analysis.
Abstract
Fatty acids (FA) have recently been used in several studies to infer the diet in a number of species. While thesestudies have been largely successful, most have dealt with predators that have a fairly specialized diet. In this paper,we used FA analysis as a tool to infer the diet of the nearctic river otter (Lontra canadensis). The river otter is anopportunistic predator known to subsist on a wide variety of prey including, fishes, crayfish, molluscs, reptiles andamphibians, among others. We analyzed the principle components of 60 FA from otters and 25 potential preyspecies in Illinois, USA. Prey species came from 4 major taxonomic divisions: fishes, crayfish, molluscs andamphibians. Within each division, most, but not all, species had significantly different profiles. Using quantitative FAsignature analysis, our results suggest that, by mass, fish species are the most significant component of Illinois Riverotters’ diet (37.7 ± 1.0%). Molluscs ranked second (32.0 ± 0.8%), followed by amphibians (27.3 ± 4.3%), and finally,crayfish (3.0 ± 0.6%). Our analysis indicates that molluscs make up a larger portion of the otter diet than previouslyreported. Throughout much of the Midwest there have been numerous otter reintroduction efforts, many of whichappear to be successful. In regions where mollusc species are endangered, these data are essential formanagement agencies to better understand the potential impact of otters on these species. Our analysis furthersuggests that quantitative FA signature analysis can be used to infer diet even when prey species are diverse, tothe extent that their FA profiles differ. Better understanding of the otter’s metabolism of FA would improveinferences of diet from FA analysis.
참고문헌 (22)
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