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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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Results 21 - 30 of 37 listed alphabetically [list by similarity]
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.
Seasonal Flux and Assemblage Composition of Planktic Foraminifera from the Northern Gulf of Mexico, 2008-2009 [More info]
The U.S. Geological Survey established a sediment trap in the northern Gulf of Mexico to collect time-series data on the flux and assemblage composition of live planktic foraminifers. This report provides an update of the 2008 time-series data to include
PDF Status and Trends of Resources Below Glen Canyon Dam Update - 2009 [More info]
Summary of changes to water quality, sediment, aquatic food, native fish, riparian vegetation, and archeological, cultural, and recreational sites since the previous assessment.
PDF 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.
Status and trends of biological resources [More info]
Description of the Status and Trends program, which monitors the abundance, distribution, productivity, and health of the Nation's living resources, detecting and evaluating changes in these variables over time.
PDF Summary and analysis of the U.S. government bat banding program [More info]
Analysis of the program with a detailed study of the best collection of data available from it. Includes recommendations for future studies of bats.
Survival of adult female northern pintails in Sacramento Valley, California [More info]
Report on the population of northern pintails between 1979 and the 1990s in Sacramento Valley, California, including methods of study including radio telemetry, causes of mortality, morphometrics, survival rates, and management implications.
The Pallid Sturgeon: Scientific Investigations Help Understand Recovery Needs [More info]
Studies to examine the linkages among flow regime, re-engineered channel morphology, and reproductive success and survival of this endangered species.
The U.S. Geological Survey Amphibian Research and Monitoring Initiative-2011 Annual Update [More info]
Amphibians are declining throughout the US. Here we explain how we monitor amphibians and why, along with some of the results we have obtained.
PDF The effects of Glen Canyon Dam operations on early life stages of rainbow trout in the Colorado River [More info]
Complex interactions among hydrologic events initiated by people and the behaviors and characteristics of animal species (both native and introduced) lead to important scientific and management problems.
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