Effects of Barriers and Thermal Refugia on Local Movement of the Threatened Leopard Darter, Percina pantherina |
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Authors: | Jacob F. Schaefer Edie Marsh-Matthews Daniel E. Spooner Keith B. Gido William J. Matthews |
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Affiliation: | (1) Sam Noble Oklahoma Museum of Natural History, University of Oklahoma, Norman, OK, 73072, U.S.A.;(2) Present address: Department of Biology, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, U.S.A.;(3) Department of Zoology, University of Oklahoma, Norman, OK, 73072, U.S.A;(4) Oklahoma Biological Survey, University of Oklahoma, Norman, OK, 73019, U.S.A;(5) Present address: Division of Biology, Kansas State University, Ackert Hall, Manhattan, KS, 66506, U.S.A;(6) Biological Station, University of Oklahoma, Kingston, OK, 73439, U.S.A |
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Abstract: | Local, short-term dispersal by the U.S. federally-threatened leopard darter, Percina pantherina, was examined in the field and in the laboratory to assess the possible effects of natural versus man-made barriers on movement. Mark-resight studies were conducted in two summers at sites in the Glover River (southeastern Oklahoma, U.S.A.). At one site, patches of 'preferred' habitat were separated by a natural riffle; at the other site, by a low-water road crossing with culverts. At the Natural Riffle site, darters moved downstream across the riffle, but also moved upstream into deeper water when water temperatures exceeded 29°C in the `preferred' habitat. Use of deeper, cooler waters by this species in late summer suggests that thermal refugia may be important habitats for the long-term management of leopard darters. At the Road Crossing site, all documented movement was in a downstream direction, and at least two darters traversed culverts in the low-water bridge. Laboratory studies of movement across several types of culverts suggested that culverts significantly decrease the probability of movement among habitat patches. |
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Keywords: | habitat conservation culverts percids fish |
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