|
- New Study Doubles the World’s Number of Bird Species By . . .
From this close morphological study, the team found 1 97 taxa per species on average (More than half of the 200 species were, in fact, single species; the highest count was 11 taxa within a biological species ) When they extrapolated this average out to the full list of 9,159 biological species, they landed on their new estimate of 18,043 bird
- Mammals evolved much faster after dinosaur extinction than . . .
Researchers have discovered three early mammal species, one of which has been named for a character from JRR Tolkien's The Hobbit
- Climate change likely drove the extinction of North Americas . . .
A new study suggests that the extinction of North America's largest mammals was not driven by over-hunting by rapidly expanding human populations following their entrance into the Americas
- Biological species concept - Understanding Evolution
The biological species concept defines a species as members of populations that actually or potentially interbreed in nature, not according to similarity of appearance Although appearance is helpful in identifying species, it does not define species Appearance isn’t everything Organisms may appear to be alike and be different species
- Biodiversity survey reveals that more species are threatened . . .
The survey received 3,331 responses from scientists studying biodiversity in 187 countries, covering all major groups of species, habitats and ecosystems “While considering the types of species and ecosystems they know best, experts estimated that about 30% of species have been globally threatened or driven extinct since the year 1500
- Cretaceous–Paleogene extinction event - Wikipedia
At one site in the Denver Basin of Colorado, after the K–Pg boundary layer was deposited, the fern spike lasted approximately 1,000 years, and no more than 71,000 years; at the same location, the earliest appearance of Cenozoic mammals occurred after approximately 185,000 years, and no more than 570,000 years, "indicating rapid rates of
- Rise of Modern Mammals Occurred Long After Dinosaur Demise
The supertree, which required more than a decade to complete, maps the evolutionary relationships among 4,510 of the 4,554 known mammal species alive today Why modern mammals took so long to
|
|
|