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Browsing by Author "Helms, Brian"

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Effects of Water Flow, Distance, and Male Density on the Fertilization Success of Freshwater Mussels 

Mosley, Tyler (2012-07-23)
Previous studies suggest that fertilization of female freshwater mussels is dependent on the distance between mates and may fail at low mussel density. This has critical implications for conservation of sparse populations. ...

An Examination of Stream Fishes at 3 Levels: Species-Area and Environmental Interactive Influences on Fish Species Richness, Stream Type Influences on Assemblage Membership, and Variation in Weight-Length Parameters by Stream Type & Fish Trait 

Colvin, Susan (2016-05-05)
Obtaining an understanding of the multi-scale influences on species richness is of concern not only to theoretical development but to building an understanding of potential mechanisms of rapid species loss. To address ...

Feeding ecology and lethal thermal tolerances among selected North American freshwater mussels (Order: Unionida) 

Fogelman, Kaelyn (2022-05-04)
Sixty-five percent of North American unionid mussel species are considered imperiled. Knowledge gaps persist in unionid feeding ecology and lethal thermal tolerance limits which could aid in the conservation and management ...

Geomorphic and Sedimentologic Analysis of Four Streams in Southeastern Alabama: Channel and Habitat Response to Changes in Land Use 

Le Blanc, Lainey (2016-12-09)
Streams of the Southeastern US have varying degrees of degradation due to the long history of agricultural land use, reflected in incising and eroding banks with aggradation of fine grained legacy sediment. These effects ...

Habitat Associations and Predictive Presence Modeling for Plethodontid Eurycea hillisi in West Georgia 

Gratton, Betsy (2018-05-16)
The purpose of this study was to identify habitat associations of Eurycea hillisi and use those characteristics to develop a predictive model. In Chapter 1, I gave an overview of the taxonomic history of the species and ...

A habitat risk assessment and breeding site projection for Slackwater Darter (Etheostoma boschungi) in Limestone Creek 

Roy, Meagan (2017-04-16)
Catalysts for species decline are difficult to identify and are rarely single. The use of predictive models that incorporate multiple factors have proven useful in recognizing major drivers of species declines in multiple ...

A metabolic approach to assessing interactions between climate change, agrochemicals, and freshwater mussel reproduction 

Gibson, Rebecca (2019-04-16)
Unionid mussels are a fundamental part of stream ecology yet are one of the most threatened aquatic organisms due in part to habitat loss, stream fragmentation, and deterioration. The increasingly relevant effects of climate ...

Response of Aquatic Biota to Changing Land Use Pattern in Streams of West Georgia, USA 

Helms, Brian (2008-05-15)
Watershed land use change is one of the most pervasive influences facing streams in the southeastern United States. In particular, watershed urbanization has a potentially dramatic impact on stream biota. Through direct ...

Shifting Relationships Between Crayfish and Symbiotic Worms in Surface Water and Subterranean Environments 

Ames, Catlin (2013-08-22)
Branchiobdellidans are small annelids (Clitellata) that have neutral, positive, and negative effects on stream crayfishes. Host effects are context dependent, with positive effects (increased survivorship and growth) ...

Use of metabolic assays to assess thermal and hypoxia stress of freshwater mussel species from central Texas 

Haney, Austin (2019-04-17)
Warming temperatures are a major concern for freshwater mussels as they are limited in range, mobility, and potential to seek refuge from heat stress. Unionid mussels are ectothermic organisms, and the temperature of their ...

Variation in morphology and physiology of introduced populations of the Virile Crayfish, Faxonius virilis Hagen 1870 

Weber, Jennifer (2018-04-23)
Crayfish often show high levels of morphological variation between and within populations. Studies have shown that environmental factors can play a role in determining external morphology. Increased levels of phenotypic ...