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Endangered species
Plant or animal species reduced to such low numbers of individuals that they are at risk of becoming extinct.
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Results 1 - 22 of 22 listed by similarity [list alphabetically]
Biological resource status and trends: Threatened and endangered species [More info]
Information concerning status and trends of biological resources, focusing on threatened and endangered species
PDF 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.
PDF Buck Island Reef National Monument Sea Turtle Research Program: Sea turtle nesting research & monitoring protocols manual [More info]
Manual for research program on the nesting habits of sea turtles of the Virgin Islands, with descriptions of species, nesting behavior, observation methods, record keeping, tagging, and tissue sample collection. (PDF file, 121 pp.)
PDF Burrowing owls winter in south Texas [More info]
Experimental use of artificial burrows in south Texas to help in conservation of the migratory burrowing owls (Athene cunicularia) that breed in dry grasslands using animal burrows.
Desert tortoise research at Western Ecological Research Center (WERC) [More info]
Links to research studies, conservation information, and general information on desert tortoises at the Western Ecological Research Center in Sacramento, California.
Ecosystems [More info]
Research and monitoring to develop fundamental understanding of ecosystem function and distributions, physical and biological components and trophic dynamics for freshwater, terrestrial, and marine ecosystems and the human and fish and wildlife communitie
Genetics and molecular tools [More info]
Describes the value of molecular biology genetic tools in enhancing the delineation of the genetic diversity and the effects of environmental degradation on living species. Links to research, which differentiated two species of sage-grouse.
Hydrologic studies in the Upper Klamath Basin, Oregon [More info]
Overview of Klamath ecological research and links to USGS Klamath studies on ground water, nutrients, sediment oxygen demand, and fish response to water quality, sucker ecology, publications, bibliographies, and data.
PDF Improving strategies to assess competitive effects of barred owls on northern spotted owls in the Pacific Northwest [More info]
A scientific study has determined that survey methods designed for spotted owls do not always detect barred owls that are actually present in spotted owl habitat.
Modeling Climate Change and Sturgeon Populations in the Missouri River [More info]
Research to address effects of climate change on sturgeon population dynamics.
Northern Divide Grizzly Bear Project [More info]
Project to assess the grizzly bear population size, trend, and survival in the Northern Continental Divide Ecosystem (NCDE) in Montana to improve the long-term survival for this threatened species. With description, DNA identification means and photos.
Pacific Island Ecosystems Research Center [More info]
Geographical isolation of the Hawaiian Islands has resulted in the evolution of endemic species unique in the world. Research at the Center aims at preventing the further extinction of these species. Links to projects, publications and other data.
Patuxent Wildlife Research Center [More info]
Core web page from America's first wildlife experiment station and a leading wildlife management refuge, the Patuxent Wildlife Research Center, Laurel, Maryland with links to projects, publications, library, contacts, and how to get there.
Patuxent Wildlife Research Center monitoring projects [More info]
Biomonitoring projects studying the status and trends of the nation's environmental resources and programs studying amphibians and birds. Links to long-term programs, resources and references, and related links.
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.
PDF Protecting black-footed ferrets and prairie dogs against sylvatic plague [More info]
Development of vaccines and methods to deploy them, to reduce the threat of this serious illness on the population of these wild animals.
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.
PDF Sturgeon research update: Confirmed pallid sturgeon spawning in the Missouri River in 2007 [More info]
Combined with supporting research in reproductive physiology, identification of spawning habitat, and early life history this result provides new understanding of environmental factors that might affect reproduction of this endangered species.
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 whooping crane report [More info]
Report on the captive breeding program at Patuxent Wildlife Research Center to help save endangered whooping cranes. Site links to natural history information on whooping cranes, why they are endangered, cool facts on cranes, and a photo gallery.
PDF Three Experimental High-Flow Releases from Glen Canyon Dam, Arizona-Effects on the Downstream Colorado River Ecosystem [More info]
Scientific issues we should consider when conduction high flow experiments to ameliorate the negative effects of dams on native river species and fluvial processes.
PDF Understanding the habitat needs of the declining western yellow-billed cuckoo [More info]
This endangered species prefers native trees in large, continuous areas of riparian habitat. Armed with this information, resource managers may identify and preserve areas favorable to this population.
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