Tag: "extinct" at biology news
Of lice and men
...e "Homo erectus has long been thought to have gone extinct
hundreds of thousands of years ago," although rece...the type of lice on archaic humans would have gone extinct
with their hosts instead of jumping to modern humans. (2) The multiregional model...
Old bones unearth new date for giant deer's last stand
...onally, woolly mammoths were believed to have gone extinct
around the same time as the giant deer, together with all the other extinct
'Ice Age' beasts such as the woolly rhino and saber-toothed cat, between about 12,000 and 10,000 yea...
Amphibians in dramatic decline; Up to 122 extinct since 1980
... are threatened. At least nine species have gone extinct
since 1980, when the most dramatic declines began. Another 113 species have not been reported from the wild in recent years and are considered to be possibly extinct. 43 percent of all species are in population decline; fewer than one percent are ...
Biodiversity: measuring up to the loss
... placed in categories on the Red List ranging from extinct
to "least concern," according to criteria that take into account their population size, population trends, and range size. Thousands of scientists from around the world feed these assessments, which have been widely used to measure the degree of degr...
Four new vertebrate fossil finds in Ischigualasto, Argentina
...e size of a mouse. The latter group was considered extinct
by this time period. "These findings give us a broader idea of the diversity of terrestrial faunas at the end of the Triassic," said Alcober, principal investigator of Earthwatch Institute's Triassic Park project. He will also report his recent find...
New Royal Society journal studies
...human settlement. Using new genetic analyses on an extinct
species for the first time we have been able to shed light on this mystery. We estimate that, as little as 1,000 years ago, the standing population of moa was c. 312 million. This estimate is much larger than the accepted population estimate (c. 159,...
Extinction in ocean's mud presages key ecological changes
...he study, depends on the reasons species are going extinct
and the order in which animals disappear. "W...ys Cardinale. "For example, large species often go extinct
first, and that is important in the marine benthic environment because the bigger you are, the more ...
Ancient fossil offers new clues to brown bears past
...bears belong to a genetic population thought to be extinct
in North America for as much as 35,000 years." Consequently, paleontologists and geneticists have found it difficult to explain where the ancestors of southern brown bears came from when ice sheets retreated about 13,000 years ago--their genetic ty...
Scientists advocate genomic sequencing of 'living fossil'
...e species. Coelacanths were believed to have been extinct
until a live specimen was discovered in 1938 off the coast of South Africa. Both of the known coelacanth species that survive today, Latimeria chalumnae and Latimeria menadoensis, are anatomically similar to their fossil relatives. Furthermore, coe...
Genome of ancient fish could reveal evolutionary mysteries, Stanford scientists say
...prehistoric fish that until 1938 was thought to be extinct
has caught the eye of geneticists at the Stanford ...ncing is a lucky accident. They were thought to be extinct
until 1938 when museum curator Marjorie Courtaney-Latimer discovered a specimen in a fisherman's cat...
Poisoning solved after millions of years
...scaping from the volcanic subsoil which formed the extinct
volcanic crater lake of Messel. The University of Bonn palaeontologists on Professor Wighart von Koenigswald's team have proposed a new theory in the latest issue of the Palontologische Zeitschrift which sheds light on the possible cause of death. W...
2004 IUCN Red List of Threatened Species reveals 15,589 species at risk of extinction
...de the following: At least 15 species have gone extinct
in the past 20 years, and an additional 12 species survive only in captivity. However, the real extinction figure is believed to be much higher, due to the conservative approach used in such listings; A total of 15,589 species (7,266 animal species...
Studies in Royal Society journals include stress in birds and depletion of medieval fish stocks
...ved worms, known as daf-2 mutants, actually became extinct
after only four generations in the presence of normal worms. It seems longevity does come at a cost, just as predicted by evolutionary theories of aging. This finding may have implications for future interventions in human aging. Contact: Dr NL Jen...
Researchers reconstruct parts of the genome of a common mammalian ancestor
...ts hear that most DNA from the genome of a species extinct
for many millions of years can be re-created with 98 percent accuracy, "jaws occasionally drop," said Haussler. "It sounds implausible. But there's enough information to reconstruct the ancestral genome on the basis of mammals that live today. We jus...
Fragmented habitats no ultimate refuges for forest-dwelling tropical birds
...d, this subset of forest endemic birds will not go extinct
because they also tolerate secondary habitats." But their Conservation Biology paper found otherwise. "We found no survivors," they wrote. "Habitat loss threatens forest-obligate birds and those using secondary habitats equally." Harris called the pa...
Say goodbye to Rudolph and other reindeer if global warming continues
...southwestern France, where reindeer became locally extinct
during two earlier episodes of warming roughly 10,...tween 11,000 and 10,000 years ago, reindeer became extinct
from higher elevations in southwestern France." He added that the Pleistocene extinction was not th...
A new tiger subspecies?
...ied subspecies of Panthera tigris, three have gone extinct
since the 1940s. In PLoS Biology , evidence is now reported for a new tiger subspecies. Conservation strategies to combat the grinding attrition of tiger populations are tailored to each subspecies. But several lines of evidence suggest that subsp...
Global bird populations face dramatic decline in coming decades, study predicts
... 2100, up to 14 percent of all bird species may be extinct
and that as many as one out of four may be functionally extinct-that is, critically endangered or extinct
in the wild," said researcher Cagan H. Sekercioglu of the Stanford Center for Conservation Biology (...
The giant eagle of Middle Earth
...niversities shed new light on the evolution of the extinct
giant eagle that once ruled the skies in New Zeala...l ecosystem. At the top of the food chain was the extinct
Haast's eagle. With a 2.5-3m wingspan weighing in at between 10 and 14 kg, Haast's eagle was about ...
Ancient DNA helps solve the legend of giant eagles
...l Bunce has shed new light on the evolution of the extinct
Haast's eagle, the giant bird that once ruled the ...he project it was to prove the relationship of the extinct
Haast's Eagle with the large Australian Wedge-tailed Eagle. But the DNA results were so radical that...
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