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Full-Text Articles in Physical Sciences and Mathematics
Assessment Of The Freshwater Mussel Community Of The Upper Mahoning River Watershed And Factors Influencing Diversity And Abundance In Small Streams, Matthew T. Begley
Assessment Of The Freshwater Mussel Community Of The Upper Mahoning River Watershed And Factors Influencing Diversity And Abundance In Small Streams, Matthew T. Begley
ETD Archive
Freshwater mussel communities have experienced drastic declines in diversity and abundance in many streams throughout North America. Among the reasons for these declines is the human-driven alteration of the landscape, as urban and agricultural use impart many known stressors to aquatic systems. Impairments include increased sedimentation, increased pollutants, increased flood frequency and intensity, and decreased diversity and abundance of many organisms, including fish, macroinvertebrates, and mussels. Attempts to explain the abundance and diversity of mussel communities using small-scale factors such as substrate type and flow velocity provided little to no predictive power. Instead, reach-scale variables, such as stream morphology and …
Dispersal Capabilities Of Two Plecopteran Species And Macroinvertebrate Community From Four Watersheds In Northeast Ohio, Alison L. Yasick
Dispersal Capabilities Of Two Plecopteran Species And Macroinvertebrate Community From Four Watersheds In Northeast Ohio, Alison L. Yasick
ETD Archive
This dissertation focused on the insect order Plecoptera, and hypothesized that Allocapnia recta populations would have lower genetic diversity than Leuctra tenuis between adjacent Chagrin and Grand Rivers due to wing structure and season of terrestrial adult emergence. Genetic variations within the 16s rRNA region of mtDNA in A. recta, a winter emerging adult with rudimentary wing structure, and L. tenuis, a summer emerging adult with fully developed wings, were compared and revealed significant genetic variability between A. recta samples from the two rivers (FST = 0.20) but not between L. tenuis samples (FST = 0.07). Further genetic variation investigation …