Some Factors Affecting Drift Rates of Baetis and Simuliidae in a Large River

作者: William D. Pearson , Donald R. Franklin

DOI: 10.2307/1933562

关键词: Calendar dateBaetisNymphEcologyTurbidityPopulation densityLight penetrationLarvaBiologyEcology, Evolution, Behavior and Systematics

摘要: Effects of eight factors on the drift rates Baetis nymphs and Simuliidae larvae were tested with multiple regression analyses. Illumination, population density all other organisms temperature had significant influences both organisms. Turbidity water—level fluctuations related to changes in indirectly through influence upon light penetration density, respectively. Dissolved—oxygen concentration, calendar date, depth water at sample site did not clearly affect either organism. In areas where densities high, accounted for 65% 81% variability observed rates. Maximum 170 x 106 sp. (63.2 kg) 10.9 (5.4 per day. See full-text article JSTOR

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