USGS: Science Topics: population dynamics

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Population dynamics

Changes in the size, composition, or structure of aggregates of single or multiple species in a specific area over time.

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Modeling Climate Change and Sturgeon Populations in the Missouri River [More info]: Research to address effects of climate change on sturgeon population dynamics.
Noninvasive methods for monitoring bear population trends [More info]: We estimate population growth rates by collecting hair at natural bear rubs along trails, roads, and fence and power lines, and analyzing the DNA from the hair.
Patuxent Wildlife Research Center: Populations [More info]: Descriptions of projects and resources on wildlife population ecology at the Patuxent Wildlife Research Center with links to research activities, long-term programs, and resources and references.
River-Corridor Habitat Dynamics, Lower Missouri River [More info]: Changes in the channel of the river to support commercial use have affected river-corridor habitats and diminished populations of native fish and wildlife; this study seeks to understand those changes to help local resource managers.
Status and Trends of the Grand Canyon Population of Humpback Chub [More info]: The number of adult humpback chub--fish 4 years old and older and capable of reproduction--increased approximately 50 percent between 2001 and 2008.
Amphibian monitoring in the Atchafalaya Basin [More info]: They're abundant in this area, but hard to count reliably. We outline a procedure for estimating the population sizes so that we can determine whether they're increasing or dwindling. We must both listen for their calls and visually confirm them.
An experiment to control nonnative fish in the Colorado River, Grand Canyon, Arizona [More info]: We removed non-native fish from a section of the river and the endangered native species humpback chub increased in abundance. But it is not yet clear that decreased competition explains the rebound in population.
Changing Arctic ecosystems-Research to understand and project changes in marine and terrestrial ecosystems of the Arctic [More info]: Three themes of ongoing research: forecasting polar bear and walrus population response to changing marine ecosystems; measuring wildlife population changes in the Arctic coastal plain, and wildlife communities in the boreal-Arctic transition zone.
Coastal habitats in Puget Sound [More info]: Declines in fish and wildlife populations, water-quality issues, and changes in coastal habitats have prompted this USGS study of the region's nearshore life and environment. Includes links to data from published reports.
Demography of the Pryor Mountain wild horses, 1993-2007 [More info]: Population size, foaling, deaths, age structure, sex ratio, age-specific survival rates, and more over a 14 year time span. This information will help land and wildlife managers find the best maintenance and conservation strategies.

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