EVS 1101 Lecture Notes - Lecture 2: Zebra Mussel, Intraspecific Competition, Interspecific Competition
20 Mar 2016
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Document Summary
Populaion size- the number of individual organisms present at a given ime. Populaion density- the number of individuals within a populaion per unit area. High: easier to ind mates, but increase compeiion and vulnerability to predaion. Low: harder to ind mates, but individuals enjoy pleniful resources and space. Populaion distribuion- spaial arrangement of organisms within an area. Clumped- arranged according to availability of resources. Age structure- the relaive numbers of organisms of each age within a populaion. Survivorship curves- the likelihood of death varies with age. Immigraion- arrival of individuals from outside the populaion. Growth rate= crude birth rate plus immigraion rate minus crude death rate minus emigraion. Occurs in small populaion and ideal condiions. Limiing factors- physical, chemical ad biological characterisics that restrain populaion growth. Carrying capacity- the maximum populaion size of a species that an environment can sustain. S-shape---logisic growth: density- dependent factors= limiing factors whose inluence is afected by populaion density.
