منابع مشابه
Protection fails to stem amphibian decline
Worries about the status of amphibian populations worldwide have been growing for many years. Survey after survey has shown dwindling numbers in habitats around the world. The most recent Global Amphibian Assessment finds that almost one third of the world's amphibian species are threatened, compared with only 12 per cent of bird species and 23 per cent of all mammals. The assessment also found...
متن کاملEmerging Ranaviral Infectious Diseases and Amphibian Decline
Infectious diseases caused by ranaviruses (RV, family Iridoviridae) not only affect wild amphibian populations but also agriculture and international animal trade. Although, the prevalence of RV infections and die offs has markedly increased over the last decade, it is still unclear whether these viruses are direct causal agents of extinction or rather are the resulting (secondary) consequences...
متن کاملAmphibian decline in Yellowstone National Park.
We conduct long-term amphibian monitoring in Yellowstone National Park (YNP) (1) and read McMenamin et al.’s article (2) with interest. This study documents decline in the extent of seasonal wetlands in the Lamar Valley of YNP during extended drought, but the conclusion, widely reported in the media, of ‘‘severe declines in 4 once-common amphibian species,’’ is unsupported. This study wrongly d...
متن کاملPossible interrelations among environmental toxicants, amphibian development, and decline of amphibian populations.
Many amphibian populations are declining in a number of geographical locations throughout the world. In most cases, the cause or causes are unknown, but are assumed to result from man-made alterations in the environment. We review existing evidence concerning how environmental xenobiotics could contribute to declines of amphibian populations by impacting growth and development of the young. Thi...
متن کاملAmphibian Decline or Extinction? Current Declines Dwarf Background Extinction Rate
—Amphibian declines and extinctions are critical concerns of biologists around the world. The estimated current rate of amphibian extinction is known, but how it compares to the background amphibian extinction rate from the fossil record has not been well studied. I compared current amphibian extinction rates with their reported background extinction rates using standard and fuzzy arithmetic. T...
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ژورنال
عنوان ژورنال: Nature
سال: 1992
ISSN: 0028-0836,1476-4687
DOI: 10.1038/355120a0