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Negative Binomial Regression
James Gragg, G. Rodda, J. Savidge, G. White, K. Dean-Bradley, A. Ellingson (2007)
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Björn Lardner, J. Savidge, G. Rodda (2007)
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G. Rodda, J. Savidge, C. Tyrrell, M. Christy, A. Ellingson (2007)
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Applied Herpetology 6 (2009) 391–396 www.brill.nl/ah Short Note The results of nocturnal visual surveys are influenced by lamp properties Björn Lardner 1 , 2 , Julie A. Savidge 1 , Gordon H. Rodda 3 , Robert N. Reed 3 and Amy A. Yackel Adams 4 1 Department of Fish, Wildlife, and Conservation Biology, Colorado State University, Fort Collins, Colorado 80523-1474, USA 2 Corresponding author; e-mail: Bjorn_Lardner@usgs.gov 3 U.S. Geological Survey, Fort Collins Science Center, 2150 Centre Avenue, Building C, Fort Collins, Colorado 80526-8118, USA 4 ASRC Management Services under contract to U.S. Geological Survey, Fort Collins Science Center, 2150 Centre Avenue, Building C, Fort Collins, Colorado 80526-8118, USA Abstract We conducted standardized visual searches at night for brown treesnakes ( Boiga irregularis ) and geckos, where we alternated between spotlight and floodlight lamps. Floodlights rendered us 25% more snakes and 71% more geckos than did spotlights. We show data on searcher variability and discuss what might affect the relative benefit of different lamp types. © Koninklijke Brill NV, Leiden, 2009 Key words Catch per unit effort, CPUE, detection rate, floodlight, gecko, light beam, snake, spotlight. Many amphibian and reptile surveys are done at night, using a flashlight or
Applied Herpetology – Brill
Published: Jan 1, 2009
Keywords: LIGHT BEAM; FLOODLIGHT; DETECTION RATE; SNAKE; CATCH PER UNIT EFFORT; GECKO; CPUE; SPOTLIGHT
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