Habitat-specific production of a fall line river shoal macroinvertebrate assemblage

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dc.contributor Huryn, Alexander D.
dc.contributor Benstead, Jonathan P.
dc.contributor Ward, Amelia K.
dc.contributor Feminella, Jack W.
dc.contributor.advisor Benke, Arthur C.
dc.contributor.author Wynn, Timothy Davis
dc.date.accessioned 2017-03-01T16:35:18Z
dc.date.available 2017-03-01T16:35:18Z
dc.date.issued 2012
dc.identifier.other u0015_0000001_0001067
dc.identifier.other Wynn_alatus_0004D_11249
dc.identifier.uri https://ir.ua.edu/handle/123456789/1549
dc.description Electronic Thesis or Dissertation
dc.description.abstract Fall Line shoals are zones of geomorphic complexity within a river basin, and have been recognized as sites of high aquatic macroinvertebrate diversity and production. The shoals of the free-flowing Cahaba River, in central Alabama, represent some of the most significant remaining examples of this channel feature that was once common throughout many rivers of the southeastern United States prior to widespread river regulation. The goal of this dissertation is to examine how the major habitats of a Cahaba River shoal influence the distribution and secondary production of the macroinvertebrate assemblage. Chapter 2 quantifies the variety of habitat types across the shoal reach and examines the temporal biomass dynamics of the 2 most common in-stream macrophytes, Justicia americana and Podostemum ceratophyllum. Chapter 3 presents a new method for obtaining in situ growth rates of several species of the diverse pleurocerid snail assemblage. The results of this method were later used to estimate production for this family. Chapter 4 describes the distribution, biomass, and production of the nonnative Asiatic clam, Corbicula fluminea, across the shoal reach, highlighting its dependence on Justicia habitat. Finally, Chapter 5 incorporates the preceding chapters into a study of the distribution of macroinvertebrate assemblage production across bare bedrock, Justicia, and Podostemum habitats, as well as the entire shoal reach. Total annual production of all macroinvertebrates was 56.1 g AFDM m-2 y-1 in bedrock, 284.4 in Podostemum, and 177.3 in Justicia habitats. Total habitat-weighted production of the shoals reach was 87.1 g m-2 y-1, with bedrock contributing 24.3%, Podostemum 22.7%, and Justicia 53.0% to this total. This study supports the view that Fall Line shoals can support high habitat diversity and production, and that the more complex habitats (e.g., those with macrophytes) enhance benthic invertebrate diversity and production. Also, the influence of a given habitat depends largely on its relative abundance, and this study demonstrated that the Justicia habitat can have a dominant influence on diversity and production of a river reach. This work advances our understanding of the roles of shoal habitats in maintaining the diversity and function of this endangered river channel feature.
dc.format.extent 140 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Ecology
dc.title Habitat-specific production of a fall line river shoal macroinvertebrate assemblage
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Biological Sciences
etdms.degree.discipline Biological Sciences
etdms.degree.grantor The University of Alabama
etdms.degree.level doctoral
etdms.degree.name Ph.D.

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