ENVS 1000U Lecture Notes - Lecture 7: Logistic Function, Exponential Growth, Ecotourism
2 Feb 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 sex ratio age structure survivorship. What are the characteristics of a population: population size = number of individual organisms present at a given time, numbers can increase, decrease, cycle or remain the same. Clumped (common: based on resources or habitat. Uniform: individuals compete for space and resources, population demographics = respond to changes in sex ratio, age structure, survivorship. Sex ratio = proportion of males to female: monogamous species, a 50/50 sex ratio is optimal. Age structure = relative numbers of organisms of each age cohort within a population. High densities predation low densities within an area. Random: type ii: equal number of deaths at all ages, type iii: more deaths at young ages.
