Sentences with phrase «on species populations»

Not exact matches

The panel concluded it was uncertain whether Enbridge could successfully mitigate impacts on caribou populations and that there was insufficient knowledge on the effects of vessel traffic and noise on marine species.

The science (human population genetics) is clear that our species arose as a population, and that is what I have focused on (since that is my area of expertise).

With all due respect, if you'd read the actual study, you would see that this was not a whole genome sequence comparison; rather it was a comparison of mitochondrial 12S rDNA and 16S rDNA sequences for the purposes of confirming the species relationship between the Pod Mrcaru lizards (P. sicula), the source population from Pod Kopiste (also P. sicula), and the original indigenous population on Pod Mrcaru (P. mellisellensis).

The fast - increasing population also upsets the ecological balance between various species and their source of sustenance, by putting added strain on the natural resources of the earth.

Rivet popping on spaceship Earth consists of doing things that cause the extermination of populations of nonhuman organisms and even whole species.

The most passionate argument in the book, in a chapter on declining Jewish population, pleads that, after the Holocaust, Jews are an endangered species, deserving protection and enhancement for the sake of diversity, like the bald eagle: «You have friends who work to rescue endangered animal and plant species, so you know why this matters.»

They used information on birds and trees in landscapes with different levels of production output to project how different species» population sizes would respond to different ways of using the land.

The less intensive farming practices (plant protection, soil cultivation), the more favourable fertilizing management and the more diversified crop rotations on organic farms enhance specimen - and species - rich earthworm populations.

Maui Nui Venison, a sustainable operation based in Hawaii, harvests wild Axis Deer on the islands of Maui and Moloka'i to keep the invasive species populations under control, and through partners like Nicky USA, provides this truly wild protein to consumers.

On Thursday, the museum — which bills itself as the oldest in Chicago — will turn out some of its rarer animal specimens, including a small rodent called a southern rock vole and two specimens of prairie chicken, a species whose population has rapidly declined due to habitat destruction.

Shedd Aquarium, Lincoln Park Zoo, Chicago Zoological Society's Brookfield Zoo and the 226 other member organizations of the Association of Zoos and Aquariums (AZA), have launched a new effort focused on saving the world's most vulnerable species from extinction and restoring them to healthy populations in the wild.

Many of the projects focus on endangered or threatened species, or those that have declining populations.

«In sperm whales, and likely other whales and dolphins, culture has the potential to affect population biology, and so issues as diverse as genetic evolution and the impacts of global warming on the species.»

In the Northeast, the researchers project a ratio of high species movement from land use as compared to climate change, based on its already dense development and large population.

«Personality is a heavy word to put on a bug,» Marshall says, «but if you define personality as individual behavior responses — well, I've had some spiders, tarantulas of the same species and from the same population, and I can take one out of a box and let it run over my hand, and I have others that just freak out and try to run away.

Many factors are taken into account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.

As a result, the species can shape the ecosystem differently depending on the sex ratio of the population,» Palkovacs said.

On one of La Chalupa's first missions, in 1972, scientist - aquanauts surveyed nutrients and bottom sediments and described algal populations, identifying some 30 new species.

The Neandertal species did not go extinct, because it was never a separate species; instead population pockets of Neandertals died out around 30,000 years ago, whereas other Neandertal populations survived through interbreeding with their modern human brothers and sisters, who live on to this day.

The US Endangered Species Act requires federal biologists to keep close tabs on pelican populations for the first five years after delisting.

These insults have whittled their population down 90 percent of its level from 45 years ago and put the species on the critically endangered list of the International Union for Conservation of Nature.

It can control population levels and put pressure on species to develop natural resistance, says Laurenson, who started working with the wolf project in the mid-1990s.

Laidre's team looked at what is known about marine mammal populations that play a key role in Arctic ecosystems and human communities, focusing on polar bears, beluga whales, narwhals, bowhead whales, walrus, and six different seal species.

By cross-referencing these impacts with data on local elephant populations, forest tree - species composition and structure, nutrient availability, and understory growth in existing Central African forests — both protected and unprotected ones alike — Poulsen and his team determined that up to 96 percent of all forests in the region were susceptible to dramatic changes if elephant populations shrank or disappeared.

Populations of both penguin species have plummeted in recent years, which the research blames on the loss of the tiny, shrimp - like krill that are a staple food for both birds.

Furthermore, as more populations are declared protected, and more and more species are listed under the Convention on International Trade in Endangered Species (CITES), the demand for forensic testing in wildlife cases is sure to inspecies are listed under the Convention on International Trade in Endangered Species (CITES), the demand for forensic testing in wildlife cases is sure to inSpecies (CITES), the demand for forensic testing in wildlife cases is sure to increase.

The species was on the brink of extinction late in the 20th century but has largely recovered and now has a stable population and is in the process of being removed from the U.S. federal government's list of endangered species.

Nadeau also studies the potential impacts of climate change on species around the globe, using modeling, field observation and experiments to predict where species are most vulnerable and determine how conservation groups can best mitigate the negative impacts of climate change on animal populations.

For the booming moose population of Isle Royale, a key species in the world's longest running predator - prey study on the island, skulls have shrunk by about 16 percent over a 40 - year period.

Meanwhile, populations of certain species of Antarctic penguins such as the Adélie are dwindling, and Antarctic krill — the tiny crustaceans that feed whales and many other animals — are also on the decline.

Although the king of the jungle is fairly well studied, most research efforts have focused on individual populations rather than the entire species, which is down to perhaps as few as 20,000 individuals.

Eben Paxton of the U.S. Geological Survey Pacific Islands Ecosystems Research Center at Hawaii Volcanoes National Park and colleagues looked at population trends for seven species of native forest birds living on Kauai's Alakai Plateau, the eroded crater of a long - extinct volcano.

To determine the true toll, the Three Gorges Dam is taking on animal and plant species, Liu says, long - term data is needed, so that decreases in population totals can be compared with natural species fluctuation.

The study throws cold water on the federal government's claims that the Yellowstone grizzly population has been recovering steadily and the animals could be removed from the threatened species list.

Recently researchers have looked favorably on a version of Darwin's own idea: that populations of a single species can separate when they change their ecology — for instance, adapting to different temperatures or food resources.

The feather friends at the Cornell Laboratory of Ornithology contend on their Web site that «a study in 2003 found few actual effects on populations of 27 native species.

The finding, experts say, has implications for conservation management, which often solely focuses on the number of animals in a population, and may extend to chimpanzees, dolphins, whales, and other species.

After 40 months of deliberation, the agency concluded that «the species is not on the brink of imminent extinction,» because of the large Caspian population, and therefore does not qualify as «endangered,» says Roddy Gabel, chief of the USFWS Division of Scientific Authority.

Ecologists used a big data approach to test the links between climate suitability and persistence strategies for nearly 100 populations of over 30 species of trees and herbs growing on 3 continents and 16 countries across the globe.

To better understand the potential role of acoustic signals in butterfly larvae integration and adoption by ant colonies, scientists compared two populations of parasitic butterflies: a predatory species that feeds on ant broods, and a cuckoo species that is fed directly by the worker ants.

This raises significant new concerns in the effort to control this invasive species that is devastating native fish populations on the Atlantic Coast and in the Caribbean Sea.

«The goals of the study were to help re-establish populations of this threatened and declining species, and to understand better what critical resources on the landscape are associated with the ability of young tortoises to survive and thrive,» said Ron Swaisgood, Ph.D., director of Applied Animal Ecology at San Diego Zoo Global.

With the aim of studying the history and genetic diversity of the species, analysis was conducted on the genomes of another ten Iberian lynxes from Doñana and Sierra Morena, the only two surviving populations on the Iberian Peninsula, which have been isolated from each other for decades.

During their study, the researchers also discovered a species on the island that may help control the brown widow population naturally: the parasitoid wasp known as Philolema latrodecti.

Yet for years, scientists have classified the two as the same species, arguing that they were slightly different populations that mingled on the edges of the forest.

On average today, the populations of species in an area are about 31 % smaller than was the case at the time of European settlement.

Despite rare hybridization, the finch populations remain behaviorally and morphologically distinct and, according to Grant, are on their way to becoming separate species.

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.»

The population on Ball's Pyramid looks like the same species, but to be sure, researchers want to compare its DNA to that of museum specimens collected over a century ago.

«This population is clearly on the edge between two extremes, and their life history patterns could shift to complete residency or anadromy depending on climate change and the health of the other species they interact with,» Bond said.