BIO 373 1st Edition Lecture 11 Outline of Last Lecture I Complex life cycles contd a Functional specialization II Populations a Issues when studying populations b Population ecology c Population dynamics d Population growth i Exponential 1 Continuous 2 discrete Outline of Current Lecture I Populations a Consequences of exponential growth b Life tables i Cohort life table ii Static life table iii Growth patterns 1 Rapid zero negative Current Lecture Populations Consequences of exponential growth o Grow slowly when small Because N1 is small Extinction risk is high o Grow rapidly when large In humans happened during the Industrial Revolution These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Machinery and technology for agriculture medicine etc Life tables o Show how survival and reproduction rates vary with age size or life cycle stage o How many individuals are still alive how many may go on to the next stage o Lx survivorship Nx of current stage Nx of original o Sx survival rate Nx of current stage Nx of previous stage o Fx fecundity o Cohort life table fate of group of individuals born at same time Sessile plants o Static life table survival and reproduction of individuals of different ages during a single time period Problem is it is hard to estimate the age of organisms o Life tables can be used to predict Age structure population size lambda o Growth patterns Rapid growth More births than deaths Zero growth the maintenance of a population at a constant level by limiting the number of live births to only what is needed to replace the existing population Negative growth the population is aging and more deaths than births
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