Fragmentation and Demography as Causes of Population Decline in Seychelles Freshwater Turtles (Genus Pelusios)

  title={Fragmentation and Demography as Causes of Population Decline in Seychelles Freshwater Turtles (Genus Pelusios)},
  author={Justin J. Gerlach},
  • J. Gerlach
  • Published 1 August 2008
  • Environmental Science
ABSTRACT In the Seychelles islands, all 3 endemic freshwater turtle taxa are either extinct (Pelusios seychellensis) or critically endangered (Pelusios castanoides intergularis and Pelusios subniger parietalis). These turtles are threatened by habitat loss, and monitoring of populations since 1996 has identified significant ongoing population declines. Drainage of wetland sites has reduced the number of populations, but even surviving sites are mostly reduced in area and quality. Only 5… 

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Introduction to herpetology

Introduction to herpetology , Introduction to herpetology , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

Seychelles Terrapin Action Plan

  • Phelsuma

Taxonomy , history and geography of Seychelles land tortoises and fresh - water turtles

  • Biogeography and Ecology of the Seychelles Islands
  • 1984

Longevity of reptiles and amphibians in N

  • American collections as of 1 November , 1975 Society for the Study of Amphibians and Reptiles , Miscellaneous Publications , Herpetological Circular
  • 1975