BIOL208 Lecture 15: Lecture 15 Modelling Population 1
22 Dec 2018
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Document Summary
Birth: production of new individuals in a species (sexual or asexual reproduction) r and k selected species: a way of classifying organisms based on growth rates, focusing on reproductive rates r= growth rate. Occur in variable and unpredictable environments: good colonizers, can move to environments that underwent destruction, no parental care. Semelparity: lots of off-springs produced in one single reproductive event per life time. K-selected species: want to maximize utilization of resources: produce fewer offspring, larger body size, reproduce later in life (slower development), highly competitive hence survival rates are high. Iteroparity: produce fewer and larger offspring several times during a lifetime. Occur mostly in constant, predictable environments: compete for resources in specific set of environments, very adapted, lots of parental care. Species are not distinctly r or k selected species: some can reproduce multiple times and produce many offspring at the same time. Immigration: individuals move into an area: decrease in population: death and emigration.
