Sentences with phrase «isolated populations»
The phrase "isolated populations" refers to groups of living things, such as plants or animals, that are separated from other groups of their species. They are usually located in specific areas where they do not interact or breed with individuals from other populations. Full definition
A new optimization technique could help conservation biologists choose the most cost - effective ways of connecting isolated populations of rare, threatened and endangered species living in protected areas.
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The natural world was a continuum, he concluded, with isolated populations perpetually in the process of becoming species in their own right.
Consequently, they exist only in small isolated populations and there are less than 500 wild nesting females in total.
It happens over generations as later generations stay in many ways quite similar but in certain respects become rather different from earlier generations, especially in small, isolated populations facing novel selection pressures.
Another is population viability analysis, which uses computer models to project trends in a range of conditions affecting isolated populations of a species and calculates the probability of long - time survival.
She works to isolate populations of these cells, discover how the body regulates them, and understand how they can be used to treat disease.
A small isolated population would also be subject to more intense selective pressures of their isolated environment.
Two asthma genes, identified in isolated populations in Finland and Quebec, may provide clues to this boy's illness.
The state is one of the most isolated population centers on earth, located 2,390 miles from the U.S. mainland and 3,850 from Japan.
Hawaii is the most isolated population center on the face of the earth.
These threats are particularly pertinent to humpback whales in the Arabian Sea, a genetically isolated population numbering fewer than 100 animals and currently listed on the IUCN's Red List of Threatened Species as «Endangered.»
They suggested that radically new species somehow managed to develop rapidly among isolated populations, conveniently leaving behind no fossils to docu - ment the process.
But now DNA found in bones plucked from the permafrost suggests there was a diverse array of immigrants that later broke up into isolated populations.
At least for wolves, Wirsing said, prioritizing activities that connect landscapes and attempt to rejoin isolated populations should be considered, he said.
The search for the gene began in Finland, whose isolated population has often been studied for its elevated rate of rare genetic diseases.
In Tyrol, on the other hand, only a single isolated population has been found so far in Kufstein.
«The take - away from our study is that postcopulatory sexual selection can quickly generate critical incompatibilities between ejaculates and female reproductive tracts that limit gene flow between isolated populations or species,» Pitnick says.
Contraception can help control isolated populations, but it costs a great deal, and deer are too short lived, mobile, and fertile to be affected for long.
The lynx's conservation strategy consists of connecting isolated populations through ecological corridors, but the information provided through local and regional population viability models for short and longer time periods also helps.
These occur in geographically isolated populations descended from early pastoralists who lived in different parts of Africa and Eurasia.
The government's ground - based survey already hinted that the bears» habitat was fragmenting, with pandas living in 33 isolated populations compared to the previous count of 15.
«The little ecological information we have about blue macaws suggest there are three isolated populations [in Brazil],» Miyaki explains: one from Amazonia in the north, another from the grasslands of the northeast, and the last one from the Pantanal, a vast wetland that stretches across the central states of Mato Grosso and Mato Grosso do Sul.
«Our great concern is increased fragmentation of habitat so we are ending up with very isolated populations of primates so they will become genetically less healthy,» says Tatyana Humle, a lecturer and researcher at the Durrell Institute of Conservation and Ecology at the University of Kent and a co-author on the Current Biology paper.
Potential explanations have included rising levels of atmospheric oxygen because of photosynthesis, allowing for the development of more complex animals; the rise in carnivorous species and new predatory tactics, such as the flat and segmented, armor - crushing creatures known as anomalocaridids; and the breakup of the supercontinent Rodinia, which may have created new ecological niches and isolated populations as the continents drifted apart.
The recommendations became FUNAI policy, and a model for other countries where isolated populations are emerging, such as neighboring Peru (see companion story).
To monitor isolated populations over time, FUNAI researchers conduct regular flyovers, taking aerial photos of houses and fields, estimating populations, and noting hair styles and patterns of body paint.
For species such as the jaguar, which rarely crosses into territory disturbed by humans, survival may hinge on the creation of habitat corridors linking isolated population pockets.
Admixed populations are formed through the exchange of individuals from two or more previously isolated populations.
Isolated population cohorts offer another approach to studying rare genetic variation.
However, dog breeds generally are characterized by closed breeding and relatively isolated populations, often with a small number of founders and popular sires whose gene pool is overrepresented in modern - day progeny.
This is reminiscent of canine cone - rod dystrophy 1 (cord1 - PRA, suspected RPGRIP1 mutation) in the miniature long - haired dachshund, where genotype - phenotype discordance has been demonstrated within a genetically isolated population due to the presence of genetic disease modifiers [38].
Range The Townsend's big - eared bat occurs throughout the west and is distributed from the southern portion of British Columbia south along the Pacific coast to central Mexico and east into the Great Plains, with isolated populations occurring in the central and eastern United States.
Before joining LDF, she conducted and published research on antipredator behaviors in island isolated populations of California quail.
Habitat loss alone may be a good predictor of extinctions of threatened and endemic species in biodiversity hotspots, but this takes no account of pervasive synergistic effects of hunting, wildfires and other anthropogenic impacts on isolated populations which may lead to much higher extinction rates compared to predictions from unqualified SAR models alone.
It is believed that this technique could explain why the many seemingly isolated populations of estuarine crocodile have not split into divergent species.
The essay ends with a discussion of the possibility of temperamental differences among reproductively isolated populations.
The researchers suggest to resettle small isolated populations and to undertake measures to improve fertility.
Hawaii is the most isolated population center on the face of the earth.
Konstanz evolutionary biologists working with Prof. Axel Meyer have now described parallel evolution of two closely related, but geographically isolated populations of cichlid fish in Nicaraguan crater lakes.
Horned Guan lives in isolated populations in cloudforests on the highest mountain peaks and volcanoes in Guatemala and the neighboring Mexican state of Chiapas.
«Finding a new, isolated population of large animals is sensational,» says zoologist Steven Perry of the University of Bonn.
Change can also occur due to accidental loss of alleles (genetic drift) in small isolated populations.
So how do you isolate a population of cow - sized reptiles?
«They may have derived from much older small - bodied ancestors, or adapted to evolutionary pressures occurring in small and isolated populations,» says Will.
This explains how the Asian bush mosquito has not only spread inland but can also be found in isolated populations.
This isolated population is not exploited by humans, so it offers a good baseline for conservationists to work out how many nautiluses can be safely caught.
The second was an Amazonian group from an isolated population of indigenous Amerindians.