BIO205H5 Lecture Notes - Lecture 13: Metapopulation, Spatial Analysis, Carrying Capacity
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BIO205 Lecture 13
● Populations are structured spatially
● We explore what spatial characteristics influence population dynamics
● Spatial models explain extinction and are important for conservation
● Habitat comes in patches
○ Patchy habitat influences dynamics within a population
■ Movement is saturated in one area
■ Do these chipmunks belong to one population?
○ Subpopulation: subset of a larger population
○ Metapopulation: spatially separated population sets of the same species
● The Rocky Mountain Parnassians butterfly population is spread across patchy habitat
○ What influences these patches
○ Why are there patches and what are some general patterns to predict what
factors are crucial to predict whether one patch is a large patch or small patch
● We can use a basic model to describe metapopulation dynamics
○ How many available patches have animals in them?
■ What influences whether a patch is influenced or not?
■ What could increase # of occupied patches?
■ Animals moving in - and decreasing would be animals moving out
○ E = probability of extinction
○ C = probability of colonization (animals moving in)
● Not all patches are created equally
○ What are some important factors to determine what patches are occupied and by
○ What patch characteristics might determine its likelihood to be colonized?
■ Size of patch
■ Carrying capacity
■ Patch isolation
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