BIOL 1001 Lecture Notes - Lecture 23: Background Extinction Rate, Outcrossing, Macroevolution

• School: York University
• Department: Biology
• Course: BIOL 1001
• Professor: Alexander Mills

Document Summary

Biol 1001 biodiversity and extinctions: key concepts. Adaptive radiations: a major pattern of rapid diversification in the history of life. Mass extinctions: repeated throughout the history of life. Rapid eli(cid:373)i(cid:374)atio(cid:374) of a high proportio(cid:374) of life"s (cid:271)iodi(cid:448)ersit(cid:455) i(cid:374) a short period: mass extinctions. A mass extinction is the rapid extinction of a large number of lineages scattered throughout the tree of life. Mass caused by events: the big five. They happen more suddenly than shown here: the end-cretaceous. In terms of deep time, this is only 1. 4% of the way back to the start of the earth. Also claimed more than of marine species. This is for animal families, including terrestrial ones know the pattern of this. Slowest rebound was after the permian extinction, which was the most acute: adaptive radiatio(cid:374)s ofte(cid:374) produ(cid:272)e (cid:862) tar ph(cid:455)loge(cid:374)ies(cid:863, there are two major triggers of adaptive radiations. On a large scale, this could be afforded by a mass extinction.