Sentences with phrase «wild populations by»

Salmon farms were already known to weaken wild populations by exposing them to lice infestations, interbreeding with escaped farmed fish, and contaminants such as antibiotics, pesticides, and disinfectants.

Not exact matches

They were given authority over a fourth of the earth, to kill its population with the sword, famine, and disease, and by the wild animals of the earth.

The torture and murder last week of a top election official and the deportation of two foreign Odinga advisers have fuelled wild online conspiracy theories and «fake news» items consumed voraciously by Kenya's tech - savvy population.

After getting pushback from lawmakers and thousands of residents, state environmental officials are considering major changes to a management plan that called for the eradication of New York's wild mute swan population by 2025.

Back then, few scientists had caught more than a fleeting glimpse of a forest elephant in the wild; they extrapolated populations by counting dung piles along paths the creatures carved through the underbrush.

A study by a team of archaeologists based at the University of Copenhagen published today in the Royal Society journal Open Science documents that the region now known as the Black Desert in eastern Jordan could sustain a population of wild sheep.

Indeed, if lions» wild prey is edged out by the grazing livestock of a swelling African population, they will have no choice but to develop a taste for beef.

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.

Fortunately, an underdominance - based system should make it fairly easy to return future generations to their original, unmodified state by releasing enough wild mosquitoes back into the population.

«Our recovery could be stalled, at best, by failing to be able to insert a more diverse gene pool into the existing wild population.»

The same study found farming had positively affected wild paiche populations by redirecting harvest pressures to farmed populations.

There is a plan, however, to maintain a genetically pure population of Cuban crocodiles by breeding the species and then releasing them into the wild.

Over the past few decades, a small international clan of scientists, alarmed by the sudden decline of corals, have created underwater nurseries aimed at «replanting» corals to buttress wild populations.

It did not begin to seriously discuss the risks associated with using the approach to engineer genes that could quickly spread through wild populations — known as gene drives — until after experiments demonstrating the concept in fruit flies had been published in a peer - reviewed journal (V. M. Gantz & E. Bier Science 348,442 — 444; 2015).

Whiting hopes his research findings serve to inform the public that the alligator was here first, and we should act accordingly by preserving the animal's wild populations and its environment.

Our work shows that farm fish are as potent at the gamete level as wild fish, and if farm escapes can revive their spawning behaviour by a period in the wild, clearly pose a significant threat of hybridisation with wild populations.»

Gough Island might have been largely uninhabited by humans, but 50 years later, residents of nearby islands raised questions about the unusually vicious mice that now roam the island (50 per cent heavier than wild mice anywhere in the world) and devastate the bird population.

Giraffe populations have declined by some 40 percent in the last 30 years, with fewer than 98,000 individuals left in the wild.

«Pet ferrets could pose a risk to wild polecat species by introducing their poor genetic material into wild polecat populations,» Ernest explains.

«Large - scale conservation strategies such as Panthera's Jaguar Corridor Initiative, which are instrumental to protect broadly distributed species such as jaguars, maintain their connectivity, and by doing so to ensure their long - term survival, need to incorporate genetic monitoring of wild populations to fully understand how these species respond to environmental changes and increasing levels of human impacts,» Wultsch said.

A research group led by the American Museum of Natural History and global wild cat conservation organization Panthera has published the largest gene - based survey of its kind on wild jaguar populations in Mesoamerica.

«Any attempts to enhance the genetic diversity of ferrets by using wild polecats should be done ethically and legally, and should ensure that domestic ferrets do not breed into wild ferret or polecat populations.»

In the case of a disease like heartworm, which is transmitted by mosquitoes and infects both wild animal populations and companion animals, there is some natural variation in both drug coverage and mixing.

Some 70 % of the wild populations examined by the study, including the relatives of banana, cassava, wheat, and sorghum, are considered high priority for collection; 300 could not be located in any gene bank.

Captive breeding has had the desired effect and by 2008 the wild population numbered 106 adults and 39 young.

To test whether a partial loss of plant - derived dietary fiber would result in a partial loss of native gut microbes, the authors also collected fecal samples from a semi-captive population of red - shanked doucs who lived in a sanctuary and received about half of the normal variety of plants eaten by wild doucs.

But by the 1990s, white - tailed deer populations in parks had swelled to such size that many species of native wildflowers such as trillium and lilies largely disappeared, replaced by wild ginger and exotic species such as garlic mustard and Japanese stiltgrass, plants not favored by deer.

A new study led by the Centre for GeoGenetics at the University of Copenhagen, in collaboration with scientists from 11 international universities, reports that a significant part of the genetic variation in modern domesticated horses could be attributed to interbreeding with the descendants of a now extinct population of wild horses.

The finding was bad enough: During the last two decades, the population of wild chimpanzees and gorillas in the West African nations of Gabon and the Republic of the Congo has declined by more than half.

All this unfettered felling and trapping meant that by the end of the 19th century — around the time that passenger pigeon populations began to plummet — the wild turkey was in trouble.

Today, in a paper in the open access journal ZooKeys, a team of bat biologists led by Don Buden of the College of Micronesia published a wealth of new information on this «forgotten» species, including the first detailed observations of wild populations.

While breeding and reintroduction programs are becoming more effective by providing more pandas to bolster the wild populations, conservationists believe that learning more about the importance of personality combinations in breeding success could ultimately help boost the number of pandas even further — not only in accredited zoos, but also in their habitats in China.

Hu argues that although the sturgeon's population can be sustained by captive breeding and restocking the Yangtze, banning TPT at this stage would do little to undo the damage in the wild.

Teleki calculates that for every infant that survives a year at the final overseas destination, 10 chimpanzees die in transit or on arrival, or are killed in the wild by poachers — small wonder that conservationists are alarmed at the impact continued commercial exploitation will have on wild populations whose habitats are being progressively destroyed.

It turns out that within five to 11 generations of fish (about 25 to 50 years), the foreign genes introduced into wild populations through hybridization are removed by natural selection.

Neither the selective pressure nor the evolutionary response could have been identified with the methods used by the majority of studies that examine how wild populations respond to environmental changes, which predominantly concentrate on changes in the phenotype.

Back then, the West was still wild: The population of Taft, Montana, one of the three towns threatened by the Big Burn, consisted mostly of gamblers and prostitutes — «five for every man,» as one official noted at the time.

The Gulf of Maine coastline, historically home to one of the richest shellfish populations in the U.S., is undergoing a dramatic change, with once - flourishing wild blue mussels all but disappearing, according to a study led by University of California, Irvine ecologists.

The dogs are further threatened by rabies, parvo and canine distemper viruses, which frequently break out in domestic dog populations in rural areas and spread to wild dogs that encounter them.

The major hurdles flagged by WMI are the need for multiple wild populations, hybridization with coyotes, the integrity of the wolf genome, and land ownership patterns in wolf habitat.

Fraser, himself an avid fisherman, says these results provide hope for wild populations that were initially negatively affected by human - induced hybridization.

That means fish populations previously bolstered by hatchery stock are, genetically speaking, indistinguishable from purely wild populations.

Reasoning that previous studies may have missed infected bonobo populations, a team led by Beatrice Hahn, MD, a professor of Microbiology in the Perelman School of Medicine at the University of Pennsylvania, conducted a more extensive survey, increasing both the number and places they sampled wild bonobo populations.

Since Christophe Boesch began studying wild chimpanzees in the Taï forest in Côte d'Ivoire in 1979, the animals» populations have declined by more than two - thirds.

By using genetic analysis to assess a subset of historical reintroductions into Tanjung Puting National Park, Indonesia, they found that orang - utans from a non-native and genetically distinct subspecies were unwittingly released and have since hybridized with the Park's wild population.

Led by Thomas Cucchi of National Center for Scientific Research in Paris, France, and Lior Weissbrod of the University of Haifa in Israel, the study set out to explain large swings in the ratio of house mice to wild mice populations found during excavations of different prehistoric periods at an ancient Natufian hunter - gatherer site in the Jordan Valley of Israel.

Unsustainable hunting for consumption and trade of wild meat (also known as bushmeat) by humans represents a significant extinction threat to wild terrestrial mammal populations, perhaps most notably in parts of Asia, Africa and South America [4 — 6].

However, over the last three years, our field team, led by Sumbee Tumursukh, have refined a method to reliably estimate the population of these wild ungulates in Tost for the first time: the so - called «double observer technique», which had previously been used by our India team to count ungulates in the Himalayas.

In 1960 there were 22 captive snow leopards in Europe and North America but by 1976 the population had increased to 167, many of them wild caught animals.

The threat this poses to monarch populations was underscored by Dr. Sonia Altizer, a professor at the University of Georgia and leading researcher on monarch diseases: «Disease can build up in farmed monarchs, which can then spread to wild butterflies.