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Life Sciences Commons

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Retrospective Theses and Dissertations

Environmental Sciences

1998

Ecology and evolutionary biology

Articles 1 - 2 of 2

Full-Text Articles in Life Sciences

Butterflies In The Highly Fragmented Prairies Of Central Iowa: How The Landscape Affects Population Isolation, Leslie Ries Jan 1998

Butterflies In The Highly Fragmented Prairies Of Central Iowa: How The Landscape Affects Population Isolation, Leslie Ries

Retrospective Theses and Dissertations

Ever since MacArthur and Wilson presented the Theory of Island Biogeography in 1963, there has been considerable concern about the ability of a system of isolated reserves to retain species diversity or viable populations over extended periods of time. Despite this interest, very little is known about how readily individuals move around in their landscape. Edges and corridors have both been targeted as landscape features that may have important consequences for directing movement and thereby affecting isolation. Edges may form a barrier to movement reducing the probability that an individual will leave a patch. For individuals that have left, they ...


Gene Flow At A Snail's Pace: Phylogeography And Conservation Genetics Of Relict Populations Of The Iowa Pleistocene Snail , Tamara Kay Ross Jan 1998

Gene Flow At A Snail's Pace: Phylogeography And Conservation Genetics Of Relict Populations Of The Iowa Pleistocene Snail , Tamara Kay Ross

Retrospective Theses and Dissertations

The Iowa Pleistocene snail, Discus macclintocki, is a federally endangered land snail found only in northeast Iowa and northwestern Illinois. This species is believed to be a glacial relict with populations isolated for the last 16,000 years. In this study, I investigated the amount of genetic variation within, and the gene flow among, ten isolated populations of the Iowa Pleistocene snail, Discus macclintocki (Baker). I sequenced part of the 16s region of the mitochondrial DNA from 175 snails. Populations clustered clearly by watershed, suggesting that flooding events may have been the historical avenue of gene flow rather than overland ...