The direct reason for the extinction of some species is __B__. A. continuous appearance of new species B. destructive activities of human beings C. more and more homeless animals D. the great change of ocean E. cosystems F. In each case, the finger of blame points directly at human ...
Particular emphasis is placed on the role of non-consumptive values as a key component of species' survival. It is demonstrated that, in many cases, some existence value must be appropriated to the resource in order for extinction to be avoided. 展开 关键词:...
When I was a boy, I had a Time-Life book called "The Birds." In it was a section showing the few U.S. species we'd already lost to extinction: the Great Auk, the Carolina Parakeet, the Heath Hen. The biggest picture, though, was reserved for the Passenger Pigeon. Martha, the la...
The biologist of the university's department of zoology suggested that long-gone species such as the woolly mammoth would not be the best focus for de-extinction efforts. Ecologists have been taking a closer look at the science behind de-extinction and discussed how to decide which species to ...
Yet after each of these extinction events, life prospered again very soon. New species quickly took the places of old ones and flourished. Life is still flourishing on the Earth within a few million years. For the Earth, millions of years are like minutes to a human. ...
Categories of imperilment like the global IUCN Red List have been transformed to probabilities of extinction and used to rank species by the amount of imperiled evolutionary history they represent (e.g. by the Edge of Existence programme). We investigate the stability of such lists when ranks ar...
Stacking the deck for extinction. Reports on the US Congress' efforts to revise the Endangered Species Act. How congressmen made the hearings in favor of anti-environmental regulations part... Rauber,Paul - 《Sierra》 被引量: 0发表: 1995年 Stacking the deck for extinction Reports on the US...
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threats to the functional diversity of these species due to global climate change may a priori not seem more intense than local threats22. Finally, we find that the current scenario of species extinction based on the IUCN threatened status would result in a worst-case scenario for the loss of...
Given that this area represents the centre of genetic diversity for the species, extinction of these populations would lead to massive loss of genetic diversity since more northerly populations are genetically depauperate relative to populations in the southeast. A northern expansion of the species' ...