Population Dynamics & Biotic Indices

Population Dynamics & Biotic Indices - EVVP/BIOL...

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EVVP/BIOL 350 Lecture 12: Population dynamics and biotic indices Dr Kim de Mutsert Fall 2011
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Population dynamics A population is a group of individuals of the same species, living in the same area Population size can be a measure of: - The number of individuals in a define area ( abundance ) - The number of individuals per unit area or volume ( density ) - The dry or wet weight of the organisms per unit area or volume ( biomass )
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Properties of Populations Population – a group of individuals of the same species that occupy the same area same species that occupy the same area The ‘species’ part can be problematic.
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Properties of Populations Population – a group of individuals of the same species that occupy the same area The ‘species’ part can be problematic. The ‘individual’ part can be problematic. anemones
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Properties of Populations Population – a group of individuals of the same species that occupy the same area The ‘species’ part can be problematic. The ‘individual’ part can be problematic. The ‘area’ part can be problematic.
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Populations in Space Populations have a distribution Geographic barrier Environmental barrier (humidity) Environmental barrier (temperature)
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Populations in Space Distributions may change in space and time
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Populations in Space Distributions may change in space and time
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Populations in Space Types of distributions Random distributions occur with homogeneous, stable environments
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Populations in Space How to determine abundance? Count every individual Use quadrats and multiply by total area/habitat Lincoln-Petersen Index: N = M*(n/R) N = total population M =total tagged n = total sample recapture Mark-recapture Devil’s hole pupfish: 118 specimens
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Abundance over Time Exponential growth occurs in absence of constraints.
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Exponential population growth Population growth rate is a function of the starting population size, death rate, and birth rate New borns: B( t) = bN(t)Δt Deaths: D( t ) = dN(t)Δt Total population: N ( t+Δt ) = N ( t ) + B( t) - D( t ) N ( t+Δt ) = N ( t ) + bN(t)Δt - dN(t)Δt ΔN/Δt = ( b-d)N ( t ) d N /d t = rN ( t ) N ( t ) = N ( t0)ert
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Exponential growth is usually inhibited (at some point) ‘Things’ happen with increasing density
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Density-dependent effects Contest competition Density-dependent growth Population of: Limited resource: Response in growth rate
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Density-dependent effects Scramble competition Contest competition Population of: Limited resource: Response in growth rate
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Density-dependent effects Scramble competition Density-dependent growth Population of: Limited resource: Response in growth rate
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This note was uploaded on 01/23/2012 for the course BIOL/EVPP 350 taught by Professor Kimdemutsert during the Fall '11 term at George Mason.

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Population Dynamics & Biotic Indices - EVVP/BIOL...

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