BIOLOGY 101 Lecture Notes - Lecture 26: Generation Time, Survivorship Curve, Population Ecology
Document Summary
Dispersion: spacing of individuals in a population. Types of dispersion: clumped dispersion: patchy, could be because of resources, uniform: territorial, partitioning, random: no control, few constraints. Observation 1: population size changes through time. Observation 2: births depend on population size. Observation 3: deaths are not ransom: survivorship curve females live longer. Observation 4: survival curves differ among species: parental investment is important for survival curve. Compares births + immigrations vs deaths + emigrations: birth + immigrants = deaths + emigration. Population growth is usually limited: logistic growth curve always ends with a cap. Carrying capacity = k: predators can usually cause stable cycles of population size. Generation time: the time between the birth of an individual and the birth of its offspring: r=b-d: intrinsic population froth rate per capita per generation. Density independent factors: chance events whose impact does not depend on population density.
