Question: How does the evolution of a key adaptation affect niche breadth during an adaptive radiation? Organisms: Cenozoic horse and camel species, as well as Pleistocene ungulates. Predictions: Niche breadth theoretically could increase, decrease or remain the same as attainment of a key adaptation facilitates a niche shift. Simpson predicted a decrease in niche breadth (ecological specializa...

Vol ca nic rocks have formed along the length of the North Amer i can Cor dil lera dur ing the Neo gene and Qua ter nary pe ri ods. Vol ca nism of this age is dom i nantly al ka line and ex tends through out cen tral Brit ish Co lum bia and the south ern Yu kon Ter ri tory. Dis tinct prov inces of al ka line magmatism have been iden ti fied in BC, in clud ing the north ern Cor dil lera vol ca n...

-Phalangeridae is one of the most widely dispersed families of possums (Marsupialia, Dirprotodontia) in the Australasian region, extending from Tasmania in the southeast to Sulawesi of the Greater Sunda Islands of Indonesia in the northwest. Yet this one family of possums has generated the most morphological and biochemical phylogenetic uncertainties of any family within Order Diprotodontia. Th...