The Effects of impoundment depth and isolation on fish species diversity and fish size

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Show simple item record Bottcher, Jared Summerville, Keith S. 2007-06-01T16:12:25Z 2007-06-01T16:12:25Z 2007-06-01T16:12:25Z
dc.description.abstract A problem for many fisheries managers is trying to maintain a diverse prey base while maximizing predator size. To test the effects of water depth and impoundment isolation on fish size and species composition, two rock-quarry ponds were sampled at the Great Ape Trust in central Iowa during the fall of 2005. One impoundment was shallow and small compared to an adjacent impoundment that was relatively deep and large. The impoundments were isolated from one another for the majority of the year by an extremely shallow, narrow band of water that was subject to lateral transfer from the Des Moines River. We hypothesized that fish of each species will be greater in the larger, deeper pond. Specimens were collected using a throw net, lengths were recorded with a tailors tape, and capture locations were marked using GPS. Two-tailed t-tests were then used to analyze data sets that were standardized using log transformations to assume for normality. Although species composition was found to be identical in both impoundments, significant differences in mean length were only found in two of the five species, bluegill and the common carp. We conclude that factors other than pond depth play a greater role in influencing body size such as dissolved oxygen content and inter- and intra-specific competition. en
dc.format.extent 2368692 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.relation.ispartofseries DUCURS 2006;35
dc.subject Fish species composition en
dc.subject Fish populations -- Iowa en
dc.subject Intra-specific composition en
dc.subject Inter-specific composition en
dc.subject Fishes -- Habitat -- Iowa en
dc.subject Water levels -- Iowa en
dc.title The Effects of impoundment depth and isolation on fish species diversity and fish size en
dc.type Presentation en

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  • DUCURS [196]
    Poster sessions and presentation from the Drake University Conference on Undergraduate Research in the Sciences held each April at Olmsted Center on the Drake campus.

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