Sentences with phrase «population size»

This could result from neutral processes if the effective population size of males is reduced relative to females due to a higher variance in the number of offspring from males than from females.

This cold snap would have made life difficult for our African ancestors, and the genetic evidence points to a sharp reduction in population size around this time.

The researchers found that the species that died out had lower genetic diversity than the ones that survived — a hallmark of small population size.

This has been shown to have a small but significant impact on population size by increasing the number of breeding birds, as well as influencing the sex ratio.

Nest counts are the main source of demographic data for sea turtles, but it's hard to estimate population size from these counts.

Other forms of rarity, like a limited range and a small population size for species that once were common, are not sustainable and could lead to extinction.

Although access to some resources may be increased (for some) with increasing population size, there is one absolute resource which can not be increased — surface area.

Larger population sizes and rapid growth rates create greater demands on both societies and environments.

And that, he warns, is tricky, involving many different assumptions (about population sizes on different continents, for instance) in the poorly documented period before recorded history.

Overall characteristics of societies and economies, such as population size, economic activity, and land use, are highly dynamic.

Community cat colonies, like other populations of animals in the wild, have a certain population size at which they are most stable.

Nest counts are the main source of demographic data for sea turtles, but it's hard to estimate population size from these counts.

While population size and economic growth undoubtedly have a part to play in this, it should also be noted that alcohol is becoming more widely accepted in Indian culture.

Whether you're a tourist or a resident, stop in to a local restaurant, and let these cities prove that population size doesn't matter when it comes to good food.

The cat recently surpassed the dog as the most popular pet in the world, with a global population size estimated at 600 million.

Follow - up molecular work will provide us with more information, but additional survey work will have to be undertaken to determine the actual population size within the sanctuary.

Future population size in poor countries will have significant consequences for health and the environment, say the authors.

It would help provide a rare benchmark for evaluating the historic population size of a species prior to its becoming endangered, which is usually not available for endangered species.

But even at that extreme, there would be a viable population size.

You can base your choice of site to join on population size alone.

Local governments also were organized into population size bands — small, medium and large — based on population.

Total adult population size is unknown, but the species is extremely abundant throughout the limited range.

Measuring population size and using sampling techniques to investigate the effect of a factor on the distribution of a species; 13.

In 1990, The total population size was estimated at 1.5 million, however, more recent estimates put the population at over 4 million.

Every habitat has a carrying capacity, the maximum population size of a given species that can be sustained in a particular area.

Scientists increasingly think population size and density have had a big impact on human development at certain pivotal points.

Rates are based on school district student population size.

The remaining members of the colony increase mating activities in an effort to create more offspring and stabilize the colony population size.

This new information on the historic population size greatly increases the mystery surrounding the abrupt decline in the recovery of this endangered species since 2009.

However, it's almost never feasible to count every single individual — so how do the results of wildlife surveys compare to true population size?

Support comes from data on a range of organisms, which show an inverse relationship between mutation rate and ancient population size.

The snow leopard population size was estimated independently for each year.

Higher temperatures might also have increased insect population sizes.

Low - carbohydrate advocates are masters of documenting the efficacy of their philosophy using studies with small population sizes conducted over short time periods — often over weeks or months.

The estimated population size assumes that only 50 % of the interior population was trapped in a given year.

We also don't want population size forced too low, so we need resources.

Quite aside from determining the management mechanism, this problem begs the rarely addressed question: what is the desired population size, why, and how is that number derived?

However, you can't make a plausible prediction of future survival without an estimate of present population size: not even today's worst journalists would buy it, nor should they.

For the 2018 review, population size due to a transient college or university numbers or a prison population can be discounted in the eligibility assessment.

Every habitat has a carrying capacity or, more specifically, a maximum species population size that can be sustained in that habitat.

In population genetics, effective population size is not a direct measure of the total number of people that lived at a given time.

These shifts matched up with the fluctuations in population size.