BIO120H1 Lecture Notes - Ideal Free Distribution, Ecological Niche, Introduced Species
36
BIO120H1 Full Course Notes
Verified Note
36 documents
Document Summary
Chapter 10: the distribution and spatial structure of populations. Bio120h lisa zhao 2011 | page 1. Fragmentation of habitat breaks them up into small passes restricts mvmnt. Isolated subpopulations in small habitats die due to loss of genetic diversity. Species able to use disturbed habitats have become widespread. Ex. trees at edge exposed to higher winds, die from excessive water loss. Cowbirds lay eggs in nests of songbirds. Thus, they go into forest edges to search for host nests. Nest parasitism reduces reproductive success of hosts. Rodents also have ventured into forest edges, preying on eggs. Ppooppuullaattiioonn: consists of the indiv. of a species within a given area live in areas of suitable habitat. Patchy distribution of suitable habitat leads to divided pop. Pop. would move less frequently here than in homogeneous habitats. Ddiissttrriibbuuttiioonn (population extent): the geographic area occupied by a pop. Ppooppuullaattiioonn ssiizzee: the # of indiv. in a pop.
