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- W2079134626 abstract "We examined microhabitat selection by the Gulf sturgeon Acipenser oxyrinchus desotoi a subspecies of Atlantic sturgeon that is listed as threatened by the U.S. government. Individuals and groups of sturgeons were placed in a Ferguson flume at low (4–6 cm/s) and high (5–17 cm/s) water flows, and their distributions relative to substrate and water velocity were recorded with a video camera. A Jacobsˈ selectivity index (D) was used to evaluate substrate and velocity preference by the fish. Distribution of individual fish, relative to water velocity, differed significantly in the low (X2 = 11.8, df = 2, P < 0.05) and high (X2 = 39.0, df = 12, P < 0.05) water flows. Groups also selected velocities within low (X2 = 36.1, df = 2, P < 0.05) and high (X2 = 63.8, df = 12, P < 0.05) flows. Individual fish did not select substrates in low flow but moderately preferred cobble (D = 0.32) in high flow. Groups moderately preferred sand (D = 0.40) and moderately avoided cobble (D = –0.47) in low flow. No selection was observed by groups in high flow. Differences in use of substrate types by individual fish were not significant in low flow (X2 = 4.43, df = 2, P ≥ 0.05); however, the differences were significant in the other treatment combinations (group, low flow: X2 = 134.2, df = 2, P < 0.05; group, high flow: X2 = 21.05, df = 2, P < 0.05; individual, high flow: X2 = 11.03, df = 2, P < 0.05). Results from this laboratory experiment have implications for future microhabitat studies and represent the first quantified look at microhabitat selection by age-0 Gulf sturgeons." @default.
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- W2079134626 date "1997-03-01" @default.
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- W2079134626 title "A Laboratory Examination of Water Velocity and Substrate Preference by Age-0 Gulf Sturgeons" @default.
- W2079134626 doi "https://doi.org/10.1577/1548-8659(1997)126<0330:aleowv>2.3.co;2" @default.
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