Sentences with phrase «decline of amphibian»

The decline of amphibian populations, particularly frogs, is thought to suggest that Earth is currently undergoing a sixth mass extinction event.

Recent global climate change is well documented [44] and is confounded in time with the recent declines of amphibians [2], which requires careful analyses to distinguish correlation from causation.

Not exact matches

Most of Britain's fast - declining populations of reptiles and amphibians, such as the great crested newt, live around small ponds that are unlikely to be listed, let alone protected, with the existing highly bureaucratic system of SSSI designation.

Surveys of amphibian and reptile populations stretch back to 1970 and, by compiling this data, Whitfield and his colleagues detected a calamitous decline that no one had noticed: a 75 percent drop in the total amount of amphibians over that 35 - year period.

New research from the University of South Florida published in the journal Nature reveals that amphibians can acquire behavioral or immunological resistance to a deadly chytrid fungus implicated in global amphibian population declines.

«The decline in Madagascan amphibians is not just a concern for herpetologists and frog researchers,» says Dr Franco Andreone from the International Union for Conservation of Nature (IUCN), who is one of the study authors.

First identified in 1999, B. dendrobatidis, or Bd, a fungal zoospore, has been named as a leading cause of a global amphibian population decline, including frogs and salmanders.

The counts show a decline of around 75 % in reptiles and amphibians in native forest since 1970.

«There isn't any conclusive information that climate change is causing amphibian declines at the sites we've examined,» says Cynthia Carey of the University of Colorado, Boulder.

It is thought to be responsible for a 12 per cent drop in the population of one group of Mexican lizards since 1975, and a 75 per cent decline in reptiles and amphibians in Costa Rica's native forests since 1970.

U.S. Geological Survey summary of amphibian declines The Declining Amphibian Populations Task Force Home Pages Joseph Kiesecker's Faculty Page Andrew Blaustein's Faculty Page

Mountain amphibians in Central America have declined dramatically, and around 50 per cent of species, including the tree frog Hyla calypsa (pictured), are thought to have become extinct.

The fungus infects more than 600 species of amphibian and has been implicated as the primary cause of decline in more than 200 species.

The mystery of amphibian decline continues to intrigue Hayes.

According to James Hanken, a biologist at Harvard University who heads a task force on declining amphibian populations, «at least one - third to one - half of all living species of amphibian that have been examined in this regard are on their way down, and out.»

B. dendrobatidis infects more than 520 amphibian species around the world, has caused steep declines in populations of frogs and salamanders, and has driven some species into extinction.

If the suggested statuses are approved, together with the updated declines of previously abundant in the area species, the proportion of the threatened would rise to nearly half (48 %) of the Mount Oku's entire amphibian fauna.

It is widely recognised that amphibians are among the most threatened animal groups: for example, in 2008, 32 % of species were listed as «threatened or extinct» and 42 % were listed as in decline.

Several species of frogs, salamanders, toads and other amphibians around the world have gone extinct or are disappearing («Decline and fall of the amphibians», New Scientist, 27 June 1992).

Scientists have long been puzzled over why some species of amphibians are on the decline while others stay healthy.

«Bd is the first emerging disease shown to cause the decline or extinction of scores of populations of amphibians not otherwise threatened around the world,» Goldberg said.

The move is intended to keep out the deadly fungus Batrachochytrium salamandrivorans, or Bsal, sister species of the Bd fungus that has caused the extinction or decline of countless amphibian species.

Such a sudden and rapid depletion of salamander species, especially ones with dense populations such as the eastern newt, could have «cascading effects» in affected ecosystems, says Michael Lannoo, a herpetologist at Indiana University and expert on amphibian declines.

The findings, published today in the Proceedings of the National Academy of Sciences, suggest that concentrations of chemicals considered safe for humans can have insidious effects on amphibians and could be contributing to the global decline in their populations.

Worldwide, Bd has been implicated in the decline or extinction of at least 200 amphibian species, and some biologists peg it as the driving force behind the largest disease - caused loss of biodiversity ever recorded.

Hayes is interested in the impact of chemical contaminants on environmental health and public health, with a specific interest in the role of pesticides in global amphibian declines and environmental justice concerns associated with targeted exposure of racial and ethnic minorities to endocrine disruptors and the role that exposure plays in health care disparities.

Host resistance to the chytrid fungus of amphibians Amphibians in Panama have experienced declines for over a decade due to the disease chytridiomycosis, caused by the fungal pathogen Batrachochytrium... Aamphibians Amphibians in Panama have experienced declines for over a decade due to the disease chytridiomycosis, caused by the fungal pathogen Batrachochytrium... AAmphibians in Panama have experienced declines for over a decade due to the disease chytridiomycosis, caused by the fungal pathogen Batrachochytrium... AmphibiaWeb

There are multiple causes of the detailed processes involved in global amphibian declines and extinctions [107]--[108], but global warming is a key contributor and portends a planetary - scale mass extinction in the making unless action is taken to stabilize climate while also fighting biodiversity's other threats [109].

They are, in fact, so commonplace that, even with amphibians being the victim of worldwide decline, our local toads seem, by and large, durable and stolidly passive observers of the danger.

Since 1996, a central investigation focus has been the occurrence of developmental deformities and population declines among amphibians.

The catastrophic decline and extinction of our planet's amphibians, some believe, is due to a virulent fungus spreading around the globe.

Indeed, we have been critical in the past of work suggesting a link between global climate change, the pathogenic amphibian chytrid fungus, and amphibian declines [link].

There have already been significant global declines and even the extinctions of some amphibian species due to a similar species of fungus, called Batrachochytrium dendrobatidis (Bd).

The story focuses on the decadeslong body of research pointing to near - worldwide declines in amphibians, as well as recent die - offs of bats focused in the northeastern United States.

Forget the fact that numerous studies report worrying trends for many well - studied groups like birds and amphibians (the latter that are experiencing a pandemic decline and are excellent indicators of the health of the environment), you want us to wait until all of our life - support systems are collapsing around us before you will say that, «OK, I believe it.

The global decline in amphibian numbers — 2 % since the 1950's, according to a study in Nature by Houlahan et al. (2000) should be a metaphor of the miner's canary — after all, amphibians are perhaps the best vertebrate indicators of environmental quality.

The global decline in amphibian numbers — 2 % since the 1950â $ ™ s, according to a study in Nature by Houlahan et al. (2000) should be a metaphor of the minerâ $ ™ s canary — after all, amphibians are perhaps the best vertebrate indicators of environmental quality.

Chytridiomycosis causes amphibian mortality associated with population declines in the rain forests of Australia and Central America.

They wrote, «We now recognize commercial exploitation, introduction of exotic species, and land use as ongoing causes of amphibian declines».

There are multiple causes of the detailed processes involved in global amphibian declines and extinctions [107]--[108], but global warming is a key contributor and portends a planetary - scale mass extinction in the making unless action is taken to stabilize climate while also fighting biodiversity's other threats [109].

Our statistical analyses of the histological results of Ecuadorian frogs [57] support our hypotheses that it was unlikely (1) that Bd was present in Ecuadorian amphibians prior to 1980 (N = 32, all negative, 95 % confidence limits [CL] = 0 — 0.108881), or (2) that Bd was present and infecting Atelopus ignescens in Ecuador prior to this species» decline in 1988 (N = 89, all negative, 95 % CL = 0 — 0.040601).