L10+Life+supporting+systems-Population%2C+community+and+ecosystem

L10+Life+supporting+systems-Population%2C+community+and+ecosystem

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BISC 003 Environmental Science: Life Supporting Systems s Life supporting systems s Biological concepts: individual species, population, community, ecosystem… s Ecological concepts: carrying capacity, trophic levels, biomass pyramid, food web, food chain…. s Biogeochemical cycles s Carbon cycle s Nitrogen cycle s Phosphorus cycle s Water cycle s Sulfur cycle
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s Lecture Outline s Basic Characteristics of Population BISC 003 Environmental Science: Life Supporting Systems s Basic Characteristics of Community s Basic Components of Ecosystem s Major Biogeochemical Cycles
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Population Population has certain properties that individual organisms lack s Size: number of individuals s Distribution/dispersion: random, clumped, rarely uniform s Density: the number of individuals of a species per unit of habitat area s s Age distribution (life table) s Growth rate s Possess genetic characteristics directly related to their ecology s Adaptiveness, fitness, and persistence
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Population growth curves and steady states (carrying capacity) The growth rate is affected by: s Births s Number of individuals of reproductive age s The number of offspring per birth s How often births occur s Deaths (mortality): the survival pattern determined by predation, diseases, nutrition, shelter, and living species s Immigration/emigration: move in or out per unit of time
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Population growth curve Exponential growth Logistic growth
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Population dynamics s Population Growth s Exponential Growth - Growth as a percentage of the whole. s dN/dt=rN s Biotic Potential - Potential of a population to grow in the absence of expansion limitations.
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Carrying capacity s The maximum number of individuals of a particular species that an ecosystem can support indefinitely he size of a stable population usually (the size of a stable population usually
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This note was uploaded on 12/21/2009 for the course BISC BISC003 taught by Professor Qian/ren/ko during the Fall '09 term at HKUST.

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L10+Life+supporting+systems-Population%2C+community+and+ecosystem

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