Herpetofaunal Inventories of the National Parks of South Florida and the Caribbean: Volume II. Virgin Islands National Park

Rice, Kenneth G. and Waddle, J. Hardin and Crockett, Marquette E. and Carthy, Raymond R. and Percival, H. Franklin (2005) Herpetofaunal Inventories of the National Parks of South Florida and the Caribbean: Volume II. Virgin Islands National Park. Reston, VA, U.S. Geological Survey, 50pp. (Open File Report - U.S. Geological Survey,2500-1301)

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Amphibian declines and extinctions have been documented around the world, often in protected natural areas. Concern for this alarming trend has focused attention on the need to document all species of amphibians that occur within U.S. National Parks and to search for any signs that amphibians may be declining. This study, an inventory of amphibian species in Virgin Islands National Park, was conducted from 2001 to 2003. The goals of the project were to create a georeferenced inventory of amphibian species, use new analytical techniques to estimate proportion of sites occupied by each species, look for any signs of amphibian decline (missing species, disease, die-offs, etc.), and to establish a protocol that could be used for future monitoring efforts. Several sampling methods were used to accomplish these goals. Visual encounter surveys and anuran vocalization surveys were conducted in all habitats throughout the park to estimate the proportion of sites or proportion of area occupied (PAO) by amphibian species in each habitat. Line transect methods were used to estimate density of some amphibian species and double observer analysis was used to refine counts based on detection probabilities. Opportunistic collections were used to augment the visual encounter methods for rare species. Data were collected during four sampling periods and every major trail system throughout the park was surveyed. All of the amphibian species believed to occur on St. John were detected during these surveys. One species not previously reported, the Cuban treefrog (Osteopilus septentrionalis), was also added to the species list. That species and two others (Eleutherodactylus coqui and Eleutherodactylus lentus) bring the total number of introduced amphibians on St. John to three. We detected most of the reptile species thought to occur on St. John, but our methods were less suitable for reptiles compared to amphibians. No amphibian species appear to be in decline at this time. We found no evidence of disease or of malformations. Our surveys provide a snapshot picture of the status of the amphibian species, so continued monitoring would be necessary to determine long-term trends, but several potential threats to amphibians were identified. Invasive species, especially the Cuban treefrog, have the potential to decrease populations of native amphibians. Introduced mammalian predators are also a potential threat, especially to the reptiles of St. John, and mammalian grazers might have indirect effects on amphibians and reptiles through habitat modification. Finally, loss of habitat to development outside the park boundary could harm some important populations of amphibians and reptiles on the island.

Item Type: Monograph or Serial Issue
Title: Herpetofaunal Inventories of the National Parks of South Florida and the Caribbean: Volume II. Virgin Islands National Park
Personal Creator/Author:
Rice, Kenneth G.
Waddle, J. Hardin
Crockett, Marquette E.
Carthy, Raymond R.
Percival, H. Franklin
Series Name: Open File Report - U.S. Geological Survey
Volume: 2500
Number: 1301
Number of Pages: 50
Date: 2005
Publisher: U.S. Geological Survey
Place of Publication: Reston, VA
Issuing Agency: Florida Cooperative Fish and Wildlife Research Unit
Additional Information: This document was submitted by the Florida Cooperative Fish and Wildlife Research Unit. Revised and reprinted 2005
Uncontrolled Keywords: Virgin Islands National Park; amphibians; survey; National Parks; reptiles
Subjects: Biology
Item ID: 5036
Depositing User: Stephanie Haas
Date Deposited: 27 May 2011 14:05
Last Modified: 29 Sep 2011 15:26
URI: http://aquaticcommons.org/id/eprint/5036

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