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BIOL488 (31)

Lec 10.docx

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Maryann Vaughan

HOW DO SPATIALLY VARIABLE ENVIRONMENTAL INFLUENCE POPULATION DYNAMICSWill not find individuals of a species everywhere within the area indicated on the mapno species not even the most abundant is found everywhere within its mapped rangePopulations are divided into separated discrete subpopulations that live in distinct habitat patchesareas of a particular kind of environmental that are surrounded by other kindsMetapopulation larger population to which such subpopulations belong Rescue effect immigrants may prevent declining subpopulations from becoming extinctbay checkerspot butterfly example of metapopn caterpillars feed on specific plants restricted to outcrops of serpentine rock in California during drought yrs most host plants die early in spring before the caterpillar have developed far enough to be able to enter their resting stagestudymanipulated the habitat of tiny arthropods created isolated patches of their habitatmosses growing on rocks of patches patches declined 40 in a yr demonstrated that small popn were more likely to become extinct than large popn another experimentcreated similar patches connected by narrow corrioders of moss a gap of 10was sufficient to reduce the rescue effect for tiny organismspopulations of migratory species may be influenced by events on both teh breeding and wintering grounds as well as in the places w
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