GGR101H1 Lecture Notes - Lecture 10: Quinine, Subduction, Insular Biogeography
Document Summary
1000 visitors over 70 million years that radiate into different kinds of niches. Large islands have a high immigration rate where small islands have a larger extinction rate. Islands have peculiar species to that area which is associated with remoteness and adaptive radiation into different niches and take over these roles. Islands extinctions are the largest and the best documented and we are talking about natural or anthropogenic causes: anthropogenic: habitat destruction such as the removal of forests, introduced species such as mammals, and hunting. In 1492 the europeans came and there were 60 million buffalo in northern america and by 1890 there were about 750 left which is 2 reasons :1. ) 6th extinction has been happening since about 200 years ago and 99% of the species that have existed in the geologic column have become extinct. It"s also a bit severe in the fact that it is not in the tropics so they were without their staples.
