Filters: Tags: B5-Dall-Thinhorn Sheep (X)
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Climate change theorists have projected striking changes in local weather on earth due to increases in temperature. These predicted changes may cause melting glaciers and ice caps, rising sea levels, increasing desertification and other environmental changes which seem likely to affect presumed indicator species as harbingers of more significant changes. Wild sheep, even though they are one of the more successful mammalian taxa since Pleistocene times, exhibit a suite of adaptations to glacier driven environments which may be presumed to render them sensitive to environmental changes. The authors began investigation with these assumptions by comparing changes, as determined by satellite imagery, in glacier extent...
Categories: Publication;
Types: Citation;
Tags: B5-Dall-Thinhorn Sheep,
M1-Mammals,
P2-Changes in Plant and Animal Species Due to Climate Change
Discovery of a new host-parasite relationship, Parelaphostrongylus odocoilei in Dall's sheep (Ovis dalli dalli ) in the Canadian North, prompted the first investigation of the geographic distribution, pathogenesis, ecology and epidemiology of this parasite, as well as the related protostrongylid Protostrongylus stilesi , at Subarctic latitudes (60--65°N). All protostrongylid parasites have an indirect life-cycle, where first-stage larvae are shed in the feces of a mammalian definitive host, penetrate the foot of a gastropod intermediate host, and develop to infective third-stage larvae. Protostrongylid larvae were recovered from over 2000 fecal samples from thinhorn sheep (Ovis dalli ) and other hosts for P. odocoilei...
Categories: Publication;
Types: Citation;
Tags: B5-Dall-Thinhorn Sheep,
M1-Invertebrates,
P2-Changes in Plant and Animal Species Due to Climate Change
Assessing the impact of predators on a prey population is inherently challenging, a fortiori in remote ecosystems. With this thesis, I studied the interactions between a recently declining Dall sheep (Ovis dalli dalli ) population and two predators: grizzly bears (Ursus arctos ) and wolves (Canis lupus ), in the secluded Northern Richardson Mountains, Canada. After reviewing the status of this Dall sheep population, I investigated its interactions with grizzly bears and wolves -mostly the indirect effects of predation; using satellite telemetry, habitat utilization analyses, δ 13 C and δ15 N stable isotopes, behavioural observations, and the documentation of Gwich'in and Inuvialuit Traditional Ecological Knowledge...
Climate change theorists have projected striking changes in local weather on earth due to increases in temperature. These predicted changes may cause melting glaciers and ice caps, rising sea levels, increasing desertification and other environmental changes which seem likely to affect presumed indicator species as harbingers of more significant changes. Wild sheep, even though they are one of the more successful mammalian taxa since Pleistocene times, exhibit a suite of adaptations to glacier driven environments which may be presumed to render them sensitive to environmental changes. The authors began investigation with these assumptions by comparing changes, as determined by satellite imagery, in glacier extent...
Categories: Publication;
Types: Citation;
Tags: B5-Dall-Thinhorn Sheep,
M1-Mammals,
P2-Changes in Plant and Animal Species Due to Climate Change
Discovery of a new host-parasite relationship, Parelaphostrongylus odocoilei in Dall's sheep (Ovis dalli dalli ) in the Canadian North, prompted the first investigation of the geographic distribution, pathogenesis, ecology and epidemiology of this parasite, as well as the related protostrongylid Protostrongylus stilesi , at Subarctic latitudes (60--65°N). All protostrongylid parasites have an indirect life-cycle, where first-stage larvae are shed in the feces of a mammalian definitive host, penetrate the foot of a gastropod intermediate host, and develop to infective third-stage larvae. Protostrongylid larvae were recovered from over 2000 fecal samples from thinhorn sheep (Ovis dalli ) and other hosts for P. odocoilei...
Categories: Publication;
Types: Citation;
Tags: B5-Dall-Thinhorn Sheep,
M1-Invertebrates,
P2-Changes in Plant and Animal Species Due to Climate Change
Climate change theorists have projected striking changes in local weather on earth due to increases in temperature. These predicted changes may cause melting glaciers and ice caps, rising sea levels, increasing desertification and other environmental changes which seem likely to affect presumed indicator species as harbingers of more significant changes. Wild sheep, even though they are one of the more successful mammalian taxa since Pleistocene times, exhibit a suite of adaptations to glacier driven environments which may be presumed to render them sensitive to environmental changes. The authors began investigation with these assumptions by comparing changes, as determined by satellite imagery, in glacier extent...
Categories: Publication;
Types: Citation;
Tags: B5-Dall-Thinhorn Sheep,
M1-Mammals,
P2-Changes in Plant and Animal Species Due to Climate Change
Climate change theorists have projected striking changes in local weather on earth due to increases in temperature. These predicted changes may cause melting glaciers and ice caps, rising sea levels, increasing desertification and other environmental changes which seem likely to affect presumed indicator species as harbingers of more significant changes. Wild sheep, even though they are one of the more successful mammalian taxa since Pleistocene times, exhibit a suite of adaptations to glacier driven environments which may be presumed to render them sensitive to environmental changes. The authors began investigation with these assumptions by comparing changes, as determined by satellite imagery, in glacier extent...
In 2009 and 2010, the National Park Service (NPS) Arctic and Central Alaska Networks tested aerial distance sampling and hierarchical modeling to estimate Dall's sheep (Ovis dalli dalli) abundance in Gates of the Arctic National Park and Preserve (GAAR). This report details the field methods and summarizes results for the 2010 survey. Further information regarding data analysis and interpretation for both surveys can be found in Schmidt et al. (2011). In 2010, we flew 318 20-km long contour transects generated on a 9-km grid across available sheep habitat in GAAR (26,921 km2 survey area). We detected 220 groups totaling 557 individuals on 86 transects. Data were analyzed using spatially-explicit Bayesian modeling,...
Assessing the impact of predators on a prey population is inherently challenging, a fortiori in remote ecosystems. With this thesis, I studied the interactions between a recently declining Dall sheep (Ovis dalli dalli ) population and two predators: grizzly bears (Ursus arctos ) and wolves (Canis lupus ), in the secluded Northern Richardson Mountains, Canada. After reviewing the status of this Dall sheep population, I investigated its interactions with grizzly bears and wolves -mostly the indirect effects of predation; using satellite telemetry, habitat utilization analyses, δ 13 C and δ15 N stable isotopes, behavioural observations, and the documentation of Gwich'in and Inuvialuit Traditional Ecological Knowledge...
Discovery of a new host-parasite relationship, Parelaphostrongylus odocoilei in Dall's sheep (Ovis dalli dalli ) in the Canadian North, prompted the first investigation of the geographic distribution, pathogenesis, ecology and epidemiology of this parasite, as well as the related protostrongylid Protostrongylus stilesi , at Subarctic latitudes (60--65°N). All protostrongylid parasites have an indirect life-cycle, where first-stage larvae are shed in the feces of a mammalian definitive host, penetrate the foot of a gastropod intermediate host, and develop to infective third-stage larvae. Protostrongylid larvae were recovered from over 2000 fecal samples from thinhorn sheep (Ovis dalli ) and other hosts for P. odocoilei...
Categories: Publication;
Types: Citation;
Tags: B5-Dall-Thinhorn Sheep,
M1-Invertebrates,
P2-Changes in Plant and Animal Species Due to Climate Change
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