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Black bullhead (Ameiurus melas) status data created for the Western Division of the American Fisheries Society (WDAFS)
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The source of this coverage data set is the fish biodiversity maps created for The Nature Conservancy (TNC) as part of their Hexagon Project. Professor Peter Moyle and his graduate student, Paul Randall, of the Department of Wildlife and Fisheries Conservation Biology at the University of California, Davis were hired to produce range maps for all known fish species that presently occur in California. Each coverage denotes a separate fish species (refer to the species coverage key below). The polygons are estimated to be accurate at a scale of roughly 1:1,000,000.
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These data were compiled to evaluate the potential impact various environmental conditions may have on native fish populaitons through predation. Introduced warm-water sport fishes present a high predation risk for juvenile native fishes, but observations of juvenile native fish surviving and recruiting in some rare cases led us to question what environmental conditions might be responsible for these trends. These data were compiled to allow for a relative comparison of predation effectiveness between a suite of warm-water predators under a variety of environmental conditions. Mean numbers of prey fish surviving in replicated overnight laboratory predation trials were quantified.
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Fish data was integrated within a GIS by georeferencing observations to an existing national spatial framework (National Hydrography Dataset), which allows for broader transferability to watersheds shared with neighboring states, creating a seamless layer not limited by state boundaries. Addressing the management and conservation challenges for native fishes will require the ability to “data mine” the extensive existing information on distribution and abundance of species available from aquatic survey programs. Results from such syntheses can be used to assess the current conservation status of native fishes, quantify the extent of species invasions, and establish baseline distributions with which to evaluate the...


    map background search result map search result map Black bullhead (Ameiurus melas) distribution and status by HUC8 Black bullhead (Ameiurus melas) distribution in California as of 2002 Black Bullhead Occurrence in the Little Colorado River Basin Laboratory Predation Data (various nonnative warm-water sport fishes), Arizona Black Bullhead Occurrence in the Little Colorado River Basin Laboratory Predation Data (various nonnative warm-water sport fishes), Arizona Black bullhead (Ameiurus melas) distribution in California as of 2002 Black bullhead (Ameiurus melas) distribution and status by HUC8