Status and Trends

Reports & Publications

Effect of Species Rarity on the Accuracy of Species Distribution Models Influences of Wildfire and Channel Reorganization on Spatial and Temporal Variation in Stream Temperature and the Distribution of Fish and Amphibians Measuring and Monitoring Biological Diversity: Standard Methods for Amphibians Status and Trends of the Nation's Biological Resources, vols. 1-2

Subtopics

Amphibians

Frogs & Toads Salamanders

Related Subjects

Agricultural Practice (Impacts)

Threatened and Endangered Species

Amphibians
(Frogs, Toads, and Salamanders) - The continental United States is home to at least 230 amphibian species: 90 frog and toad species, and 140 species of salamanders. Amphibians appear in cities and in natural areas, as well as rainforests and in wetlands. Healthy amphibian populations that once thrived are now on the decline worldwide. In the U.S. alone, declines in amphibian populations are particularly serious in California, the Rocky Mountains, the Southwest, and Puerto Rico. This decline has been a result of amphibian malformations - extra limbs, malformed or missing limbs, and facial malformations. These malformations have been documented in 44 states, and involve nearly 60 species. In some local populations, up to 60% of the amphibians exhibit malformations.

Did You Know...?

Amphibians & Reptiles

Antarctica is the only continent that has no native amphibian species. Amphibians and reptiles are very important vertebrates on the Pacific Islands. Surprisingly, given their importance, there are only six reptiles native to the Hawaiian Islands and all of them live in the sea. The rest of Hawaii's reptiles and amphibians are invaders. Learn more about amphibians from the NBII Pacific Basin Information Node website

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Amphibian Malformations and Declines

Publisher: USGS | Science Center: National Wetlands Research Center (NWRC, Lafayette) | Format: URL

www.nwhc.usgs.gov — Frog malformations have been reported from 42 states. The broad geographic distribution of these malformations warrants national attention. This website directs to resources on amphibian malformation that include a field guide to malformations of frogs and toads, the Vermont Frog Report (through 1997), USGS Amphibian Research and Monitoring More...

National Amphibian Atlas - Amphibian Research and Monitoring Initiative (ARMI)

Publisher: USGS | Science Center: Patuxent Wildlife Research Center (PWRC, Laurel) | Format: URL

igsaceeswb00.er.usgs.gov:8080 — From the Web site: "The Amphibian Research and Monitoring Initiative (ARMI) National Atlas for Amphibian Distributions (or simply, the ARMI Atlas), is a compilation of current and historic records of amphibian occurrences. These records are from published, peer-reviewed scientific literature, museum records, state and regional herpetological More...

ARMI - Amphibian Research and Monitoring Initiative

Publisher: USGS | Format: URL

armi.usgs.gov — The U.S. Geological Survey's Amphibian Research and Monitoring Initiative (ARMI) is a multidisciplinary effort to determine the status and trends of amphibians in the U.S., research the causes for amphibian declines, and provide scientific information to decision-makers to help halt or reverse declines. This website includes information on ARMI's More...

Checklist of Amphibian Species and Identification Guide An Online Guide for the Identification of Amphibians in North America north of Mexico

Publisher: USGS | Science Center: Northern Prairie Wildlife Research Center (NPWRC, Jamestown) | Format: URL

www.npwrc.usgs.gov — Interest in amphibians continues to rise as people become more aware of this fascinating group of animals. To the uninitiated all frogs may look alike; ditto for salamanders (in the same manner that beginning birders are overwhelmed by the immense variety of small brown birds). One of the purposes of this checklist and online identification guide More...

Contaminant Exposure and Effects-Terrestrial Vertebrates database (CEE-TV)

Publisher: USGS | Science Center: Patuxent Wildlife Research Center (PWRC, Laurel) | Format: URL

www.pwrc.usgs.gov — Information about ecotoxicological exposure and its effects on terrestrial vertebrates residing in estuarine and coastal habitats like the Atlantic, Gulf and Pacific Coasts, Alaska and Hawaii, as well as the Great Lakes. These vertebrates include birds, mammals, amphibians and reptiles. The data is a compilation of results from computerized More...

Biological and Ecotoxicological Characteristics of Terrestrial Vertebrates Introduction

Publisher: USGS | Science Center: Patuxent Wildlife Research Center (PWRC, Laurel) | Format: URL

www.pwrc.usgs.gov — BEST Large River Fish Health Data Query Tool provides a simplified portal for accessing database that serves fish health endpoints measured through the Biomonitoring of Environmental Status and Trends (BEST) Project's Large River Monitoring Network (LRMN). The tool allows the user to search the database by species, chemical, river basin, sampling More...

Amphibian Monitoring in the Canyon Country of the Colorado Plateau

February 2004 | Publisher: USGS (Amphibian Research and Monitoring Initiative (ARMI)) | Science Center: USGS Other | Format: URL

armi.usgs.gov — At least 13 amphibian species are found on the Colorado Plateau, although some have very limited distributions in this bioregion. Amphibian declines have been documented in many parts of the world, but knowledge of amphibians on the Colorado Plateau is inadequate to determine population status or trends for most species. The U.S. Geological More...

ARMI - South Central ARMI Guide to Louisiana Amphibians

Publisher: USGS | Science Center: National Wetlands Research Center (NWRC, Lafayette) | Format: URL

www.nwrc.usgs.gov — The south-central region includes the States of Texas, Oklahoma, Arkansas, Mississippi, and Louisiana. We are currently conducting research projects designed to monitor amphibians on Federal lands in these States and to research possible causes of declines in amphibian populations. These potential threats include loss or degradation of habitat, More...

Conservation Genetics Lab

Publisher: USGS | Science Center: Forest and Rangeland Ecosystem Science Center (FRESC, Corvallis) | Format: URL

fresc.usgs.gov — The Conservation Genetics Lab carries out molecular analysis, pedigree analysis, modeling, data management, and cryogenic sample repository. As a part of this research, the lab investigates the effectiveness of molecular markers used to enhance enforcement of the Endangered Species Act policy. During the past 15 years, this research has involved More...

Using Proportion of Area Occupied to Estimate Abundance of Amphibians in Everglades National Park and Big Cypress National Preserve

Publisher: USGS (South Florida Information Access (SOFIA)) | Science Center: USGS Other | Format: URL

sofia.usgs.gov — This project uses data on detection of amphibian species after repeated sampling at a site to estimate the occupancy rate of various amphibian species (MacKenzie et al., 2002). Declines in amphibian populations have been documented for many regions and habitat types worldwide (Alford and Richards, 1999). No single cause for declines has been More...

Assessment of Selenium and Atrazine Exposure and Effects to Wildlife at the North Platte National Wildlife Refuge, Scottsbluff, Nebraska

Publisher: USGS | Science Center: Columbia Environmental Research Center (CERC, Columbia) | Format: URL

www.cerc.usgs.gov — The primary goal of the proposed research is to evaluate selenium and atrazine exposure and effects to fish, amphibians, and waterfowl that utilize the Refuge. The following subordinate objectives will be met to investigate selenium exposure and effects to wildlife on the Refuge: 1.Measure selenium concentrations and total organic content in More...

It's in the Air: The Ecological Effects of Nitrogen Deposition in Rocky Mountain National Park

Publisher: USGS | Science Center: Fort Collins Science Center (FORT, Ft. Collins) | Format: URL

www.fort.usgs.gov — Encroaching development, overuse, and air- and waterborne contaminants from outside park boundaries are causing noticeable changes to water quality and ecosystem health and functioning. The Front Range metropolitan area from Fort Collins south to Colorado Springs includes 75 percent of Colorado's population and its most productive agricultural More...