Ecology-Bison and the Environment

Trends in the Distribution and Abundance of Bison in Wood Buffalo National Park

We summarized changes in the distribution and abundance of bison (Bison bison) in Wood Buffalo National Park from 1971 to 1998. Based on annual aerial counts, a significant decline in bison abundance has occurred from approximately 11,000 animals in 1971 t…
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The Response of Predators to an Erupting Bison, Bison bison athabascae, Population

During the past 20 years Bison (Bison bison athabascae) numbers have increased and Moose (Alces alces) numbers appear to have decreased within the Mackenzie Bison Sanctuary. In adjacent peripheral areas near Mink Lake Moose densities were twice that in the…
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Summer And Fall Browse Utilization By An Alaskan Bison Herd

The food habits of the Farewell, Alaska, bison (Bison bison) herd were studied by collecting fresh fecal samples on summer and fall range. The mean shrub content of the summer samples was 94.2%. The fall shrub component varied, with shrubs making up most o…
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Preliminary Response of Sandhills Prairie to Fire and Bison Grazing

This research determined the preliminary response of sandhills prairie to spring and summer prescribed burns, and their interaction with Bison (Bison Bison) grazing. Changes in species composition and standing crop were determined for paired (caged/uncaged…
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Plasticity of Reproductive Behaviour in Wood Bison Bulls: When Subadults are Given a Chance

In animals that defer reproduction until after physiological maturity because of competition by older individuals, one would expect that individuals reproduce earlier when competition decreases. We investigated nine behaviours relevant to reproduction in s…
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Foraging Ecology of Bison and Cattle

Widespread access to bison of breeding age in the recent decade has created an alternative to cattle in grassland natural area management. Cattle and bison are considered generalist foragers, yet, differences in food habits indicate that cattle are more se…
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Calving Patterns Among American Bison

We monitored calving in American bison (Bison bison) for 8 consecutive years on the Wichita Mountains Wildlife Refuge, Oklahoma. Calving rates were significantly lower among 2- and > 13-year olds than among females 3-13 years old. Although mature female…
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