Rare hunting scene raises questions over polar bear diet
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.
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
A species of ray, so rare it has only ever been recorded once back in the late 1800s, has been declared extinct after an assessment by an international team led by Charles Darwin University (CDU). The loss of the Java Stingaree, ...
Plants & Animals
Dec 12, 2023
12
772
In the summer of 2021, Canada's all-time temperature record was smashed by almost 5℃. Its new record of 49.6℃ is hotter than anything ever recorded in Spain, Turkey or indeed anywhere in Europe.
Earth Sciences
Apr 30, 2023
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750
Human appetites are pushing makos and other iconic sharks to the brink of extinction, scientists warned in a new assessment of the apex predator's conservation status.
Ecology
Mar 22, 2019
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7458
The extinction of prehistoric megafauna like the woolly mammoth, cave lion, and woolly rhinoceros at the end of the last ice age has often been attributed to the spread of early humans across the globe. Although overhunting ...
Archaeology
Aug 13, 2020
6
1842
Writing a commentary in the 50th anniversary issue of Cell, Fu Qiaomei and E. Andrew Bennett, both of the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) of the Chinese Academy of Sciences, explored the ...
Evolution
Feb 29, 2024
0
187
New evidence identifies 64 pesticide residues in milkweed, the main food for monarch butterflies in the west. Milkweed samples from all of the locations studied in California's Central Valley were contaminated with pesticides, ...
Ecology
Jun 8, 2020
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8038
Bustling cities, sprawling suburbs and blossoming agricultural regions might seem strong evidence that people have always dominated the environment. A Stanford study of South America's colonization shows that human populations ...
Archaeology
Apr 7, 2016
48
1436
Relationships between the ancestors of modern humans and other archaic populations such as Neanderthals and Denisovans were likely more complex than previously thought, involving interbreeding within and outside Africa, according ...
Archaeology
Oct 20, 2016
0
60
The blue antelope (Hippotragus leucophaeus) was an African antelope with a bluish-gray pelt related to the sable and the roan antelope. The last blue antelope was shot around 1800, just 34 years after it was first described ...
Plants & Animals
Apr 15, 2024
1
215
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.
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