Journal ArticleDOI
Summer Diet Characteristics of North American River Otters (Lontra canadensis) in Central Illinois
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TLDR
There were significant differences in the percentage of prey consumed by otters at Emiquon and in previous studies conducted in Whiteside County, Illinois, and Alberta, Canada.Abstract:
North American river otters (Lontra canadensis) frequently visit latrines where they deposit urine, feces, and anal secretions as olfactory signals. River otter scat was collected from latrines to identify prey at the Emiquon Preserve and the Emiquon National Wildlife Refuge located along the Illinois River near Havana and Lewistown in Fulton County, Illinois. Remains of prey from dissected scats were compared to osteological resources to taxonomically identify the remains. Fish were present in 85.4% of the dissected samples. Common carp (Cyprinus carpio) were the most common fish preyed upon during the study, occurring in 69.8% of all dissected samples. Crayfish were present in 77.1% of samples. Amphibians, insects, filamentous algae, green-winged teal (Anas crecca) or blue-winged teal (A. discors), and muskrat (Ondatra zibethicus) were also consumed. The minimum number of individuals (MNI) consumed was also determined based on the prey remains present. The results of a two-tailed Fisher's exact...read more
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Impacts of Pollutants on Beavers and Otters with Implications for Ecosystem Ramifications
TL;DR: In this paper, the authors review published evidence on the toxicological impacts of pollutants in beavers and river otters and discuss the implications of exposure to their behavioral systems, conservation, and surrounding ecosystem.
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Stream community richness predicts apex predator occupancy dynamics in riparian systems
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Spatial ecology of river otters in a human-modified landscape
TL;DR: The authors found that river otters in this landscape were plastic in regard to social behavior and habitat selection, highlighting their generalist nature and providing insight into their ability to successfully recolonize areas of the Midwest with sufficient vegetative cover and aquatic habitat, among other factors.
Journal ArticleDOI
Ecotoxicoparasitology of mercury and trace elements in semi-aquatic mammals and their endoparasite communities.
TL;DR: It is demonstrated how wildlife can accumulate anthropogenic contamination, although future research is needed to determine the mechanisms contributing to patterns observed between endoparasite communities and the contaminant concentrations of their mammalian hosts.
A BIBLIOGRAPHY ON THE NORTH AMERICAN RIVER OTTER Lontra canadensis
TL;DR: Otter research projects have been investigated in the area where I live near the coast of southwest Florida as discussed by the authors, where people often report seeing an otter in the pond, creek or river behind their house.
References
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Book
Stable isotope ecology
TL;DR: Isotope notation and measurement using Stable Isotope Tracers and Mixing is described in this paper, along with fractionation and scanning of the future for scanning the future.
Journal ArticleDOI
Ecosystem Alteation of Boreal Forest Streams by Beaver (Castor Canadensis)
TL;DR: In this article, the effects of beaver activity on several major ecosystem components and processes in boreal forest drainage networks in Quebec, Canada were investigated and it was shown that beavers act as a keystone species to alter hydrology, channel geomorphology, biogeochemical pathways, and community productivity.
Journal ArticleDOI
Fish size and habitat depth relationships in headwater streams
Bret C. Harvey,Arthur J. Stewart +1 more
TL;DR: The results of the experiments show that predation risk from wading/diving animals (e.g., herons and raccoons) is much higher for larger fishes in shallow water than for these fishes in deeper water or for smaller fish in shallowWater.
Journal ArticleDOI
Effects of Common Carp on Aquatic Ecosystems 80 Years after “Carp as a Dominant”: Ecological Insights for Fisheries Management
TL;DR: This work presents a synthesis on how common carp can affect aquatic ecosystems through a middle-out framework due to their capability to alter bottom-up and top-down processes, and suggests restoration efforts should focus on entire ecosystems in conjunction with common carp reductions.
Journal ArticleDOI
Differential Predation on Metamorphic Anurans by Garter Snakes (Thamnophis): Social Behavior as a Possible Defense
TL;DR: Certain anurans form postmetamorphic aggregations which may represent `selfish herds' in which individuals gain protection by association with more vulnerable conspecifics, and may have evolved as a defense against predation during metamorphosis.
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