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Report by Calvin R. Fremling regarding the effects of various factors (including natural and human-driven) on mayfly population distribution on the Mississippi River. Introduction: "Burrowing mayflies are abundant along much of the Mississippi River (Plate 1.). Hoardes of imagoes and subimagoes often cause nuisance problems for river residents, motorists and towboat personnel (Fremling 1960, 1968). Yet, the three major burrowing species, Hexagenia bilineata (Say), Hexagenia limbata (Serville) and Pentagenia vittigera (Walsh), are not able to inhabit all sections of the river. Moreover, the distribution and relative abundance of the three species have apparently changed during the past 30 years. This report explains how various innate and environmental factors influence the distribution and relative abundance of the three species. It will also be demonstrated that mayfly distribution can be utilized to assess the well-being of a river which is so large that it cannot be monitored effectively or economically by standard methods." Article offprint from Proceedings of the First International Conference on Ephemeroptera (1973?). Part of the Cal R. Fremling Collection.
Biologists; Upper Mississippi River; Mayflies; Pollution
Fremling, Cal R., "Factors influencing the distribution of burrowing mayflies along the Mississippi River" (1973). Cal Fremling Papers. 39.
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