Sentences with phrase «biologists studying populations»

«It makes no sense to us as biologists studying populations in nature to combine them all into one species,» says Grant.

Not exact matches

The study, published today in the online journal PeerJ, will be available to federal and state wildlife agencies for their consideration to determine whether distinct geographic population segments of the coastal marten warrant state or federal listing as threatened or endangered, said Katie Moriarty, a certified wildlife biologist and lead co-author on the study.

But Craig Packer, a biologist at the University of Minnesota who is in charge of a long - term study of the Serengeti lions, believes the population will recover as long as the disease doesn't spill over into the park again.

«The percentages we saw last week, they were as high as 40 to 60 percent of the population that's showing signs of wasting,» said Bruce Menge, a marine biologist at Oregon State University, who is studying the wasting disease in Oregon.

The sex ratio in the overall population is «nothing out of the ordinary,» with roughly one juvenile male for every four juvenile females, says study coauthor Michael Jensen, a marine biologist with the National Oceanic and Atmospheric Administration in La Jolla, Calif..

Servheen adds that USGS biologists are conducting a marking and tracking study that by this summer might help resolve questions over the current population.

The study highlights a «useful and effective technique of reducing introgression of coyote genes into red wolf populations,» says Dave Mech, a wolf biologist and senior scientist with the Biological Resources Division of the U.S. Geological Survey in St. Paul, who was not involved with the research.

(DeStefano and Stein shared a stage January 23 for a discussion of urban wildlife at the Harvard Museum of Natural History in Cambridge, Mass.) Where the wily things are At the forefront of this research into coyote behavior is Stanley Gehrt, a wildlife biologist at The Ohio State University, who has studied coyote populations in the Chicago area for more than a decade.

«The evidence for recent genetic connection among the three populations, across this vast distance, is solid and convincing,» says Craig Moritz, a University of California, Berkeley, biologist not affiliated with the study.

A critical assumption of any research is that the animals being studied represent their entire population,» said M. Brad Eppard, a fisheries biologist with the Portland District of the U.S. Army Corps of Engineers and a co-author on the paper.

«It is possible that Svalbard may have provided one such important refuge during warming periods, in which small polar bear populations survived and from which founder populations expanded during cooler periods,» argues biologist Charlotte Lundqvist of the University at Buffalo, The State University of New York, who is a co-author of the new study.

In a study published in 2013, Palumbi and his colleagues, including Daniel Barshis, a marine biologist at Stanford, compared two populations of the reef - building coral Acropora hyacinthus at their field site off Ofu Island in American Samoa.

«There could be populations of beavers moving around in the continent and in the islands we don't know anything about,» biologist Giorgia Graells, of the Institute of Patagonia at Magallanes University and lead author of the study, told Scientific American.

The data suggest more genetic distinctiveness between populations across the continent than the previous study, says Samuel Wasser, a conservation biologist at the University of Washington, Seattle.

Vincent Saba, a research fishery biologist at NOAA's Northeast Fisheries Science Center (NEFSC), and his study co-authors used annual nest counts from Florida and a time - series of climate data in turtle - nesting population models.

Our results suggest that in addition to «pure» species and populations, hybrids between protected animals and non-protected ones may deserve protection,» said Robert Wayne, a biologist at University of California Los Angeles and senior author of the study.

Biologists who use molecular data to study evolutionary dynamics between closely related organisms, such as populations, are constantly searching for regions of the genome with high amounts of variability.

For example, the frogs of La Selva Biological Station in Braulio Carrillo National Park in Costa Rica's Caribbean lowlands have endured a 75 percent drop in population since 1970, perhaps due to climate change, according to a study by biologist Steven Whitfield of Florida International University in Miami, who was not affiliated with this study.

A team of Smithsonian biologists led by Brandt Ryder worked closely with Ben Vernasco, a doctoral candidate in biology at Virginia Tech, on a study that aimed to identify characteristics that promote healthy wood thrush populations on U.S. Department of Defense land.

The data collected by observers over the past century allow researchers, conservation biologists and other interested individuals to study the long - term health and status of bird populations across North America.

Dr. Katie Dugger, a research biologist at the USGS Oregon Cooperative Fish and Wildlife Research Unit, Oregon State University and lead author on the report, said that «This study provides strong evidence that barred owls are negatively affecting spotted owl populations.

That means the animals move through the corridors and breed with other populations, says study author Stephen Mech, now a conservation biologist at the University of Memphis in Tennessee.

«We've known for some time that the population sizes of these animals fluctuated throughout the last ice age,» said evolutionary biologist Beth Shapiro of the University of California Santa Cruz, who was also a part of this study.

«Killer whales have been thought of by some as something like the poster child» for the process, «because there are multiple genetically distinct populations [which have not yet been formally described as separate species] with different prey preferences in the North Pacific and Antarctic,» says Phillip Morin, a cetacean biologist at the Southwest Fisheries Science Center in San Diego, California, who was not involved in the new study.

The method is creative and could make a crucial difference for the finches, adds Jeff Podos, a biologist at the University of Massachusetts, Amherst, who has studied the bird populations of the Galápagos.

«This is the first time we have seen differences in lipid concentrations between populations,» says evolutionary biologist Philipp Khaitovich of the CAS - MPG Partner Institute for Computational Biology in Shanghai, China, and the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, lead author of the new study.

That's the central question behind a University of Arkansas biologist's three - year, $ 465,098 study to test a new method for estimating population densities of two species of rare snakes.

The biologists studied a total of nine populations of scallops (Pecten maximus) along the coast of Northern Ireland.

Studies show that the animals caught by predators are generally weaker and more diseased than those killed by manmade sources.6, 7 One study found that «birds killed by cats had significantly lower mass, fat scores, and pectoral muscle mass scores» than birds of the same species killed by cars or windows.8 These studies indicate that cats are catching what some biologists refer to as the «doomed surplus» 9 — animals who would not have lived, and so whose death does not affect overall population Studies show that the animals caught by predators are generally weaker and more diseased than those killed by manmade sources.6, 7 One study found that «birds killed by cats had significantly lower mass, fat scores, and pectoral muscle mass scores» than birds of the same species killed by cars or windows.8 These studies indicate that cats are catching what some biologists refer to as the «doomed surplus» 9 — animals who would not have lived, and so whose death does not affect overall population studies indicate that cats are catching what some biologists refer to as the «doomed surplus» 9 — animals who would not have lived, and so whose death does not affect overall population levels.

Linda Gormezano, a biologist at the American Museum of Natural History, has been studying the polar bear population along the western shore of Hudson Bay.

In a study published earlier this year, biologists studying the calls and behavior of a wild koala population on an island off the Queensland coast found an interesting result, reported by the BBC:

Steven C. Amstrup, the federal biologist who led an analysis last year concluding that the world's polar bear population could shrink two thirds by 2050 under moderate projections for retreating summer sea ice, is once again in the field along Alaska's Arctic coast, studying this year's brood of cubs, yearlings and mothers.

«The fence is doing its job,» said Eric VanderWerf, a biologist who, with his wife, Lindsay C. Young, is studying populations of albatrosses and shearwaters on a grant from the Packard Foundation.

I was out on the Hudson River most of Wednesday, watching New York State biologists net, study and release a 120 - pound, 80 - inch male Atlantic sturgeon (a small one by historic standards) as part of a project tracking what appears to be a slow recovery after a terrible population crash from overfishing.

Robert F. Rockwell, a population biologist at the museum and City College of New York with whom Gormezano has collaborated in the Hudson Bay bear study, provided this reaction:

«At Rothamsted, we used glasshouse bioassays to determine that 80 % of sampled populations were highly resistant to all herbicides that can be used for selective black - grass control in a wheat crop,» says Paul Neve, a weed biologist from Rothamsted Research, one of the study's collaborators.