Sentences with phrase «population of amphibians»

So William Laurance from the National Institute for Research in the Amazon and his Australian colleagues hypothesized that the global population of amphibians was under attack by a rapidly spreading, exotic disease that was dependent on cool, wet conditions.

At Moose Hill, we are focused on assessing the populations of Amphibians.

Ecologists needed a way to more easily keep track of populations of amphibians, and green glow sticks lit the way.

According to the scientist, the results reveal that the populations of these amphibians with a tradition of coexisting with the predator for 30 years (between 10 and 15 generations of frogs) present a pattern of activity that is totally different from the populations with less coexistence or no coexistence with the red swamp crayfish.

«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.

«Under the proposed development scenario, the ecosystems of the overall site are so fragmented as to virtually ensure the extinction of all the extant populations of amphibians and reptiles on that site designated by the state as species of special concern,» stated Dr. Klemens.

There has been a recent and widespread increase of deformities (or malformations) in natural populations of amphibians; this is now perceived as a major environmental problem.

They also are deadly to birds and our diminishing populations of amphibians, whether in back yards or beyond.

Not exact matches

By monitoring amphibian populations in the Chicago region, we will be able to detect population changes before it is too late as well as assess the effects of management regimes on amphibians.

Dr. Lips studies population biology and the community ecology of amphibians.

The disease has been likened to the chytrid fungus that's wiping out amphibian populations worldwide, or the white - nose syndrome that's killing off entire caves of bats (SN: 4/30/16, p. 20).

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.

Populations of this unique species, currently known as highly threatened, were previously considered to have remained relatively stable in the face of the disease that has ravaged many amphibian species worldwide, but the frogs may have been infected over a decade ago, with the impacts only recently observed.

The species, Atelopus varius, vanished suddenly from streams across Costa Rica and Panama in the late 1980s and early 1990s, one of the many victims of the deadly chytrid fungus that has decimated amphibian populations around the world.

Bioaugmentation — taking existing beneficial bacteria, culturing them, and then adding more of them back into a biological system (not too different from eating probiotic yogurt for its purported beneficial effects on the human gut)-- is the key to restoring amphibian populations.

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.

Unusually for an infectious disease even at very low rates of infection, and in the absence of the dramatic die - offs witnessed in other amphibian populations impacted by this disease, infected populations of Darwin's frogs are destined for extinction.»

Ultraviolet (UV) light can zap amphibian eggs and might be responsible for plummeting populations of frogs and toads, some researchers have found.

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.

Of the handful of similar analyses, a 2008 study found population losses in amphibians living in Yellowstone National Park in Wyoming, and another found that small mammals in Yosemite National Park in California had tracked warming temperatures in the past century by shifting their rangOf the handful of similar analyses, a 2008 study found population losses in amphibians living in Yellowstone National Park in Wyoming, and another found that small mammals in Yosemite National Park in California had tracked warming temperatures in the past century by shifting their rangof similar analyses, a 2008 study found population losses in amphibians living in Yellowstone National Park in Wyoming, and another found that small mammals in Yosemite National Park in California had tracked warming temperatures in the past century by shifting their range.

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

Atmospheric levels of carbon dioxide belched out by cars and power plants soar, while amphibian populations plummet and glaciers dwindle like an ice cube in your palm.

But it remains to be seen whether the same type of events threaten all amphibian populations.

These findings suggest that considering multiple populations is critical to assessing toxicity of pesticides to amphibian parasites.

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.»

A new study by WCS and other groups offers a glimmer of hope for some amphibian populations decimated by the deadly chytrid fungus: climate change may make environmental conditions for the fungus unsuitable in some regions and potentially stave off the spread of disease in African amphibian populations struggling to adapt to changes brought about by global warming.

A new study by WCS and other groups offers a glimmer of hope for some amphibian populations decimated by the deadly chytrid fungus.

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.

Worldwide, most amphibian communities are not recovering, though earlier this year Ursina Tobler at the University of Zurich, Switzerland, showed for the first time that even in devastated populations, some tadpoles can survive infection (PLoS One, DOI: 10.1371 / journal.pone.0010927).

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

«While we use amphibians as an example in this article, the negative effects of collecting samples from endangered animal populations is a concern that applies across taxa and around the world.

Of the many amphibian populations that Bd savaged around the world (SN: 3/5/16, p. 14), a few have bounced back in numbers.

If data on amphibian populations is poor, our understanding of the status of many reptiles is worse.

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.

In frogs there is now some evidence of this: last year several research groups reported that some populations appear to be becoming resistant to a fungus that has decimated many amphibian species.

: Causes of population differentiation in alpine amphibians.

A 2 - year study of a population in Belgium, now entirely wiped out, has revealed that these amphibians can't develop immunity to the fungus, as was hoped.

A paper on the population genomics of amphibian killing chytrid fungus B. dendrobatidis that culminated several years of work and large collection of researchers was published in PNAS at the beginning of the summer.

In addition to differentiated retinal cells, the amphibian eye contains a population of self - renewing retinal stem cells located in the retinal periphery in a region called the ciliary marginal zone or CMZ.

If this is the case, this will be one more instance of people spreading a devastating disease to vulnerable organisms; the list already potentially includes the chytrid fungus, which is devastating global amphibian populations, and colony collapse disorder seen in honeybee populations, among more clear - cut cases, such as the American chestnut blight.

In contrast for ranavirus, a highly virulent pathogen capable of decimating amphibian populations, populations living close to agriculture with high baseline tolerance had higher viral loads than populations far from agriculture with inducible tolerance.

The research was part of a suite of experiments the team conducted to assess tolerance to pesticides, inducible tolerance, and the effects of pathogens on amphibian populations that varied in their induced or baseline tolerance, said Relyea.

«But now comes the bad news: with that tolerance there is a tradeoff, which is that they become more susceptible to parasites that, in the case of ranavirus, can wipe out entire amphibian populations.»

«The potential consequences to amphibian populations are interesting, including the continual masculinization of frog populations for many generations in habitats contaminated with high concentrations of road salt, which could potentially affect the abundance of frogs in these habitats,» said Relyea.

He has particular interests in (1) the use of ancient DNA methods to document changes in genetic variation through time and phylogenetic relationships of extinct or endangered organisms (especially of the recently extinct Hawaiian avifauna); (2) the use of highly variable genetic markers to measure genetic structure and relatedness, and to ascertain mating systems, in natural populations, and (3) the use of genetics to study the evolutionary interactions between hosts, vectors and infectious disease organisms (e.g., major projects on introduced avian malaria in native Hawaiian birds and invasive chytrid fungus in amphibians).

The scope of the studies funded covers a diverse set of health challenges across a wide range of species, from a lethal genetic disorder in California condors to deadly fungal diseases threatening the world's amphibian populations.

This is an enormous threat facing many wild populations of a variety of tailed amphibians and has not yet been solved.