Sentences with phrase «frog population»

The University of Hawaii is working with state and federal agencies to control the frog population, and NAR is supporting bills in the state legislature providing financial support for coqui population control.

The potential for frog population collapse from over harvesting is similar to what has happened with the world's marine fisheries, Bradshaw said.

The team believes this may mean that overly high salinity can decrease the frog population as salt molecules mimic testosterone, causing the masculinization of tadpoles.

In those days the pond had a viable frog population.

Similarly, they found higher than average rainfall in areas that typically experience lower annual rainfall saw positive effects on wood frog population growth.

«We now need to figure out if this novel microbe — a distant relative of oyster parasites — causes significant disease and could be contributing to the frog population declines.»

The ability of the mucus samples to kill the fungal disease was related to how prevalent the infections were among the frog population in the field as well as the survival rate of frogs raised in the laboratory that were exposed to the disease.

The results have implications both for researchers trying to understand the rapid decline in frog populations across the globe and for conservationists looking to save the animals, said Vance Vredenburg, associate professor of biology at San Francisco State University and co-author of the study.

In the field results of a study by Brianna Lam, a graduate student in the J.M.U. Department of Biology, published in the journal Biological Conservation in 2009 (as well results published by Vredenburg and Harris in 2008 in Abstracts of the General Meeting of the American Society for Microbiology), revealed that wild mountain yellow - legged frog populations in the Sierras differed greatly in their amount of cutaneous J. lividum.

Dissection indeed is a major pressure on frog populations, says N. A. Aravind, an ecologist who studies mollusks at the Ashoka Trust for Research in Ecology and the Environment here.

Frog census volunteers misinterpreted recorded frog sounds in the field, leading researchers to suspect that frog populations may be even lower than thought.

Professor Thomas Richards from the University of Exeter said: «Global frog populations are suffering serious declines and infectious disease has been shown to be a significant factor.

Scientists have found that a newly identified and highly infectious tadpole disease is found in a diverse range of frog populations across the world.

The discovery sheds new light on some of the threats facing fragile frog populations, which are in decline worldwide.

Our work has revealed a previously unidentified microbial group that infects tadpole livers in frog populations across the globe.»

In many of the wood frog populations studied, researchers found evidence of interacting temperature and precipitation influencing population size, such as warmer summers having less of a negative effect in areas that received more precipitation.

Jack comments that even if the spread of disease among frog populations in Australia were connected with movements of exotic fish, imports of ornamental fish into Britain are subject to a very strict system of licensing.

Now Kolby hopes to give endangered frog populations a leg up by allowing them to develop natural resistance against chytrid in temporary captivity.

The James Cook University herpetologist studies global frog populations and their decline from the widespread and deadly chytrid fungus.

Declining frog populations are considered an indicator of environmental damage.

Such growth could help explain why these animals have persisted, the scientists suggest, because many of the factors thought to be responsible for the decline of frog populations are particularly dangerous to water - based young.

Infection can be devastating to frog populations, killing some off completely.

Consequences of genetic erosion on fitness and phenotypic plasticity in European tree frog populations (Hyla arborea).

Introduction of ranavirus to isolated wood frog populations could cause local extinction.

Ploidy composition in all - hybrid frog populations in relation to ecological conditions.

They also found that exposure to the leaf litter from a common trees species, oak, significantly altered the sex ratios in the frog populations and, in some cases, the size of individual females.

«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.

Do you want to track local frog populations or photograph clouds for science?

This winter biologists are hard at work monitoring the health of California red - legged frog populations by taking inventory of their egg masses.

Such grants have brought us «studies» connecting «dangerous manmade global warming» to dwindling frog populations, shrinking Italian pasta supplies, clownfish getting lost, cockroaches migrating, and scores of other remote to ridiculous assertions.

Cherry and Braasch feature the involvement of students in many data gathering situations, from tree growth, to water quality and flow to frog populations.

Not exact matches

Improve diversity and condition of frog and waterbird populations through maintenance of suitable aquatic habitat; and

The watering action was also expected to support improvement in the diversity and condition of frogs, fish, turtles and waterbird populations through maintaining suitable aquatic habitat.

improve the diversity and condition of native fish, frog and waterbird populations through maintaining suitable aquatic habitat and providing opportunities for breeding and recruitment.

This watering is expected to increase the population and diversity of native waterbirds and the Southern Bell Frog and improve the health of River Red Gums and surrounding wetlands.

This stimulated micro-invertebrate populations, which support wetland and riverine food webs, increasing food resources for fish, frogs, turtles, waterbirds and other animals.

Since late February, researchers from the Peggy Notebaert Nature Museum and Lincoln Park Zoo have been monitoring levels of cortisol (known as the stress hormone) in three species that have been reintroduced or restored by the forest preserve: wood frogs (designated as «in great need of conservation» in Illinois); spotted salamanders, a rare species for northeastern Illinois; and spring peepers, a frog species whose local populations are in decline.

• In Britain newts are invading ponds earlier in spring, where their populations prey upon earlier - breeding frogs.

«You can't really talk about numbers of frogs that have died,» says population ecologist James Collins of Arizona State University.

Today's frogs, comprising more than 6,700 known species, as well as many other animal and plant species are under severe stress around the world because of habitat destruction, human population explosion and climate change, possibly heralding a new period of mass extinction.

It acts so swiftly that researchers think the best way to preserve species may be to catch uninfected frogs and return them (or their descendants) years after the virus has worked through the population.

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 study has found that Darwin's frogs are infected with the fungal pathogen Batrachochytrium dendrobatidis (Bd), and despite an absence of obvious mortality researchers have noted population declines, leading them to believe that these infected populations are at a serious risk of extinction within 15 years of contracting the disease.

Symbiotic bacteria may help frogs and other amphibians ward off the chytrid fungus plague wiping out populations worldwide

Now, there are feral populations of African clawed frogs everywhere in the United States — even in San Francisco's Golden Gate Park National Park.

Harris found that the quantity of violacein on the frogs» skins was proportional to the population density of J. lividum.

They found that the virus kills between 70 and 80 per cent of carp populations, but does not harm native fish or other species such as frogs and turtles.

«This «cryptic» nature of infectious disease witnessed amongst Darwin's frogs in Chile could potentially be causing similar «slow - burn» declines among wildlife species elsewhere — contributing to longer - term population declines and extinctions despite the lack of obvious mass - mortalities.»

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.

Vredenburg and his colleagues are carrying out a test this summer that involves applying J. lividum to populations of mountain yellow - legged frogs in an area where chytrid is just now showing up.