EEMB 2 Lecture Notes - Lecture 4: Dorset Culture
15 Mar 2018
School
Department
Course
Professor
Document Summary
Population: individuals of the same species living in the same geographical area. The population of species vary over space and time. Resources, natality, mortality, immigration, and emigration drive population dynamics. Density: the number of individuals per unit area or volume. Measured by: total counts, sub-sampling methods, and indirect indicators. Total counts: count all individuals within a population. Sub-sampling methods: sub-sample population to estimate densities and total population size. Indirect indicators: number of nests, fecal droppings, tracks as estimates of density. Patterns of dispersion: patterns change with spatial scale. Clumped- most common; individuals distributed in discrete groups; due to unequal distribution of resources and/or social behavior. Uniform: distribution based on minimum distance between individuals; due to interactions between individuals. Random: distributed without regard to position of other individuals; rare in nature, chance dispersal or resources not limiting. Natality (birth rate)=the number of offsprings produced per unit time. Mortality: the number of offsprings dying per unit time.
