SC BIOL 301 - Temporal Spacial Population Growth (4 pages)

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Temporal Spacial Population Growth

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Temporal Spacial Population Growth


Population fluctuations, Cyclic behavior of populations, Extinctions in populations, Patchy habitats

Lecture number:
Lecture Note
University Of South Carolina-Columbia
Biol 301 - Ecology and Evolution

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Biol 301 1nd Edition Lecture 5 Outline of Last Lecture I Population growth models II Density dependent growth model III Carrying capacity Outline of Current Lecture II Population fluctuations III Cyclic behavior of populations IV Extinctions in populations V Patchy habitats Current Lecture Population fluctuations All populations experience fluctuations due to factors including availability of resources predation competition disease parasites and climate Fluctuations include random and cyclic changes through time Some populations tend to remain relatively stable over long periods Some populations small organisms exhibit much wider fluctuations Small organisms tend to reproduce much faster than larger organisms so their populations often respond faster to favorable and unfavorable conditions Larger organisms have a lower surface area to volume ratio which allows them to maintain homeostasis in the face of unfavorable environmental changes When an age group contains a high or low number of individuals the population likely experienced high birth or death rates in the past Long term fluctuations in age structure can be determined for a forest by examining tree rings Populations in nature rarely follow a smooth approach to their carrying capacity Overshoot when a population grows beyond its carrying capacity often occurs when the carrying capacity of a habitat decreases from one year to next e g because less resources are produced Die off a substantial decline in density that typically goes well below the carrying capacity Die offs often occur when a population overshoots its carrying capacity Population cycles regular oscillation of a population over a longer period of time 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 Some populations can exhibit highly regular fluctuations in size Cyclic populations can occur among related species and across large geographic

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