Diel Turnover of Assemblages of Fish and Shrimp on Sandbanks in a Temperate Floodplain River

摘要: Abstract Seven sandbanks in the main channel of Brazos River, Texas, were sampled a total 35 times during both day (1800–1900 hours) and night (2200–2300 June July 2008 to examine diel turnover fish assemblages. Day samples had an average 10.1 species, whereas 12.9 species. Average abundance (catch per unit effort, here defined as number individuals 10-m seine haul) for was 41.5, compared with 80.5 samples. Species richness significantly greater on at night. Additionally, nonmetric multidimensional scaling analysis cluster indicated consistent differences assemblage structure between Most change due ictalurids palaemonids (freshwater decapod crustaceans) that only common nocturnally. Catastomids, clupeids, cyprinids, poeciliids present diurnally noct...