Filters: Tags: Monitoring 1-Changes in Plant and Animal Distribution: Fauna (X)
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Harbor porpoise, Phocoena phocoena vomerina, in Cook Inlet, Alaska, are managed as part of the Gulf ofAlaska (GOA) stock. It is not known if this population is distinct from porpoise in the GOA stock found outside Cook Inlet. No long- term dedicated studies of harbor porpoise have occurred in Cook In let. The objective here is to provide a summary of occurrence in Cook Inlet derived from archaeological data, anecdotal reports, and systematic surveys. Maps were created for each dataset. Therefore, each of these estimates is likely biased downward. In the last decade the region has seen expansion of the Port of Anchorage, proposals to build a bridge crossing Knik Arm, plans to develop mining operations and supporting...
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Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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Tags: Mammals,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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Tags: Mammals,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
We summarized and statistically analyzed historical fixed-wing aerial surveys (1949-2002) and harvest records (1983-2002) of Dall’s sheep (Ovis dalli dalli) from Wrangell-St. Elias National Park and Preserve (WRST). Among survey units there were significant differences in observed densities, hunterreported harvest, horn lengths of harvested rams, and horn length residuals from the regression of length on age. There was no consistent evidence of net change in WRST-wide sheep density, even though some survey units showed trends in density. Reported harvest in WRST declined linearly during 1973-2003 from 376 to 139 rams per year. We estimated the relationships among population and habitat characteristics with multiple...
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Tags: Mammals,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
For 40 years, the Biological Survey of Canada (BSC) has encouraged and organised studies of the arthropod fauna of Canada, through the wide involvement of the scientific community and the leadership of an expert steering committee. The benefits of the BSC to science include the completion of major cooperative projects to acquire and synthesise knowledge (documenting faunas in the Yukon, Canadian grasslands, and other significant regions and habitats), the assembly and organisation of information and specimens, and improved communication among entomologists. Its efforts have led to valuable monographs, scientific briefs, newsletters, and other products summarised here, including documents that are also useful to...
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Monitoring 1-Changes in Plant and Animal Distribution: Fauna
Chapter 11
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Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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Monitoring 1-Changes in Plant and Animal Distribution: fauna
The fundamental niche of a species is rarely if ever realized because the presence of other species restricts it to a narrower range of ecological conditions. The effects of this narrower range of conditions define how resources are partitioned. Resource partitioning has been inferred but not demonstrated previously for sympatric ursids. We estimated assimilated diet in relation to body condition (body fat and lean and total body mass) and reproduction for sympatric brown bears (Ursus arctos) and American black bears (U. americanus) in south-central Alaska, 1998?2000. Based on isotopic analysis of blood and keratin in claws, salmon (Oncorhynchus spp.) predominated in brown bear diets (>53% annually) whereas black...
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Tags: Mammals,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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Tags: Fish,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
Categories: Data,
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Tags: Birds,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
Categories: Data,
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Tags: Mammals,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
Categories: Data,
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Tags: Fish,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
Increased light reaching streams as a result of riparian vegetation management is often thought to be responsible for enhanced algal productivity. However, concomitant changes in nutrients and other physical processes confound that interpretation. We manipulated light in two separate experiments to test the role of light as a controlling factor for periphyton productivity and biomass, and to observe invertebrate responses in small streams in central British Columbia, Canada. We did this by adding artificial light to reaches of three forested streams, and in a second experiment we used shadecloth to cover reaches of two streams flowing through clearcuts. Periphyton growth, productivity and composition, and macroinvertebrate...
Population dynamics of Canada lynx (Lynx canadensis) have been of interest to ecologists for nearly sixty years. Two competing hypotheses concerning lynx population dynamics and large-scale spatial synchrony are currently debated. The first suggests that dispersal is substantial among lynx populations, and the second proposes that lynx at the periphery of their range exist in small, isolated patches that maintain cycle synchrony via correlation with extrinsic environmental factors. Resolving the nature of lynx population dynamics and dispersal is important both to ecological theory and to the conservation of threatened lynx populations: the lack of knowledge about connectivity between populations at the southern...
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Tags: Mammals,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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