BIO120H1 Lecture 10: Textbook Chapter 10

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BIO120H1 Full Course Notes
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Many populations fluctuate, varying between high and low numbers more or less periodically. Under influence of density-dependent factors, populations tend to increase/ decrease toward equilibrium size determined by carrying capacity of environment: birth and death rates respond to changes in environmental conditions (temp, moisture, salinity, acidity, and other physical factors) Environmental conditions may affect these rates directly by influencing the performance of individuals or indirectly by altering food supply: variation in population size may result from intrinsic characteristics of population. Conditions vary in space and time, creating differences in population dynamics from place to place and changes in population dynamics over time. Distance isolates subpopulations from one another, they can fluctuate independently. Changes in population are the sum of changes in all subpopulations but dynamics of large and small populations differ, subdivided populations possess unique properties. Dynamics of small populations have become increasingly relevant as species move toward extinction and human activities fragment habitats into smaller, isolated patches.

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