ENVS 1000U Lecture Notes - Lecture 7: Logistic Function, Infographic, Exponential Growth
1 Nov 2016
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Document Summary
Population = a group of individuals of a species that live in a particular area and share resources. Population dynamics (changes in population over time) are affected by the following. Characteristics of a population: population size population density population distribution population demographics. What are the characteristic of a population: population size. = number of individual organisms present at a given time. Numbers can increase, decrease, cycle or remain the same. = smallest number of individuals that would still allow a population to persist or grow ensuring long-term survival: population density. = number of individuals within a population per unit space (e. g. area or volume) Low densities: harder to find mates, but individuals enjoy plentiful resources and space. High densities: easier to find mates, but increases competition and vulnerability to predation, population distribution (or dispersion) = spatial arrangement of individual organisms within an area. = respond to change in sex ratio, age structure, survivorship: sex ratio= proportion of males to females.
