A polar bear chases a reindeer into the water, drags it ashore and devours it, in a striking scene caught on film for the first time.
Ecology
Nov 28, 2021
12
1163
China's universal three-child policy was passed into law this past August to boost the country's birth rate, after a two-child limit—implemented more than five years ago—failed to do so.
Social Sciences
Nov 23, 2021
0
46
There might be something to the adage "clever as a fox."
Plants & Animals
Nov 16, 2021
1
13
A new frog species has been discovered in Wollumbin National Park in northern New South Wales, and is one of only two known species that store their tadpoles on their bodies.
Plants & Animals
Nov 09, 2021
0
3
Short growing seasons limited the possible size of hunter-gatherer societies by forcing people to rely on meat, according to a recent study by a team of international reseachers including McGill University professor Eric ...
Evolution
Nov 08, 2021
0
246
Hyenas are frequently vilified and often feared. Hemingway once described the hyena as a stinking, foul devourer of the dead, with jaws that crack the bones the lion leaves.
Plants & Animals
Sep 27, 2021
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31
Since the spread of virus causing COVID-19 continues, experts recommended wearing homemade facemasks when surgical or N95 masks are not available to prevent the spread of the pandemic. While such makeshift masks are more ...
Soft Matter
Sep 14, 2021
4
953
There's been an age-old question going back to Darwin's time about the relationships among the world's five living rhinoceros species. One reason answers have been hard to come by is that most rhinos went extinct before the ...
Plants & Animals
Aug 24, 2021
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1767
Small fish that live in open water and form a significant part of the base of the marine food chain have returned in huge numbers to the Clyde Sea, according to new research from scientists at the University of Aberdeen.
Plants & Animals
Aug 09, 2021
0
644
A McGill-led study has shown that the size of the Maya population in the lowland city of Itzan (in present-day Guatemala) varied over time in response to climate change. The findings, published recently in Quaternary Science ...
Archaeology
Jun 30, 2021
3
127
In population genetics and population ecology, population size (usually denoted N) is the number of individual organisms in a population.
The effective population size (Ne) is defined as "the number of breeding individuals in an idealized population that would show the same amount of dispersion of allele frequencies under random genetic drift or the same amount of inbreeding as the population under consideration." Ne is usually less than N (the absolute population size) and this has important applications in conservation genetics.
Small population size results in increased genetic drift. Population bottlenecks are when population size reduces for a short period of time.
Overpopulation may indicate any case in which the population of any species of animal may exceed the carrying capacity of its ecological niche.
This text uses material from Wikipedia, licensed under CC BY-SA
