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Hexagenia Mayflies: Biological Monitors Of Water Quality In The Upper Mississippi River, Calvin R. Fremling
Hexagenia Mayflies: Biological Monitors Of Water Quality In The Upper Mississippi River, Calvin R. Fremling
Journal of the Minnesota Academy of Science
ABSTRACT-Analysis of Hexageniamayfiy distribution patterns has proven to be a simple, inexpensive method of monitoring water quality in the Upper Mississippi River. Burrowing Hexagenia nymphs live at the mudwater interface intimately associated with organically enriched sediments that have a strong affinity for contaminants. By their presence or absence in silted habitats, they assess the synergistic effects of hypoxia, toxins, and other stresses throughout the year. Adults are large and easily collected, providing inexpensive water quality monitoring on a river so large that comprehensive chemical, physical, and biological analyses are not logistically feasible or affordable. Pollution abatement in metropolitan Minneapolis-St. Paul …
Three Southeastern Minnesota Lakes As Possible Habitat For Hexagenia Mayflies, James R. Erickson
Three Southeastern Minnesota Lakes As Possible Habitat For Hexagenia Mayflies, James R. Erickson
Journal of the Minnesota Academy of Science
Three small lakes near Winona, Minnesota, were sampled to determine if they supported populations of Hexagenia mayfly nymphs. Hexagenia nymphs were rare in Lake Winona and the Gravel Pit, and none was found in Crooked Slough. A low dissolved oxygen content at the mud-water interface is probably the limiting factor in Lake Winona and Crooked Slough. The limiting factor in the Gravel Pit is probably the bottom type.