The rate at which new species are formed in a group of closely related animals decreases as the total number of different species in that group goes up, according to new research. The research team believes these findings suggest that new species appear less and less as the number of species in a region approaches the maximum number that it can support.
New research from zoologists at Southern Illinois University Carbondale opens a bigger window to understanding a deadly fungus that is killing off frogs throughout Central and South America, and that could threaten amphibian populations in North America as well.
It’s hard to relax if your cattle are stressed, so the ability to predict and avoid potential stressors is essential. Fortunately, an online model developed by scientists with the Agricultural Research Service (ARS) provides information to help cattle–and producers–keep their cool when temperatures rise.
Harvard University researchers have discovered a new type of retinal cell that plays an exclusive and unusual role in mice: detecting upward motion. The cells reflect their function in the physical arrangement of their dendrites, branch-like structures on neuronal cells that form a communicative network with other dendrites and neurons in the brain.
Ten years ago great attention was attracted by the discovery that it was possible to demonstrate signal transfer in proteins using statistical methods. In an article in the journal Proceedings of the National Academy of Science Uppsala researchers are now presenting results of experiments that contradict the theory.