Assemblage structure and shallow-water habitat use by small-bodied fishes at lower Missouri River sandbars

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Assemblage structure and shallow-water habitat use by small-bodied fishes at lower Missouri River sandbars

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/5076

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dc.contributor.advisor Galat, David L. en
dc.contributor.author Ridenour, Clayton en_US
dc.coverage.spatial Missouri River
dc.date.accessioned 2010-01-12T19:09:34Z
dc.date.available 2010-01-12T19:09:34Z
dc.date.issued 2007 en_US
dc.date.submitted 2007 Summer en
dc.identifier.other RidenourC-072707-T7980 en_US
dc.identifier.uri http://hdl.handle.net/10355/5076
dc.description The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. en_US
dc.description Title from title screen of research.pdf file (viewed on January 8, 2008) en_US
dc.description Includes bibliographical references. en_US
dc.description Thesis (M.S.) University of Missouri-Columbia 2007. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Fisheries and wildlife. en_US
dc.description.abstract Populations of many native big-river fishes have declined since channelization and flow regulation contributed to losses of shallow-water habitat (SWH) on lower Missouri River (LMOR). Existing point and wing-dike sandbars represent a potentially important source of SWH to fishes during early ontogeny within the main channel of LMOR. Small-bodied fishes were sampled using pre-positioned electrofishing devices from 0.0-0.5 m water depths adjacent to four point and four wing-dike sandbars on LMOR between July and October, 2005. A suite of associated environmental factors were also measured. Habitat use and assemblage structure relative to three spatial (sandbar type, region within sandbars, and distance from shoreline within region) and two temporal (month, diel), and environmental factors were evaluated using Analysis of Variance, Detrended Correspondence Analysis, and Canonical Correspondence Analysis. Samples yielded 49 species from 13 families in depths 0.0-0.5 m; most fishes were [lesser than or equal to]105 mm TL. Fish mean length increased but abundance decreased from July to October. Ordination analyses revealed that the assemblage was organized into bodylength subgroups. Fish assemblages were not different between point and wing-dike sandbars. Instead, fishes aligned along a depth-velocity gradient relative to body length. Shallow (ca. 0.12m), near-shore areas were dominated by fishes [lesser than] 35 mm TL during the day, but larger fishes (e.g., 70 mm TL) moved nearer to shore at night. This research shows that main-channel sandbars provide nursery to many fluvial fishes during early ontogeny and that sandbars play an important role as nursery in large regulated rivers. en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.subject.lcsh Fishes -- Habitat -- Missouri River en_US
dc.subject.lcsh Fishes -- Infancy -- Habitat -- Missouri River en_US
dc.subject.lcsh Ontogeny en_US
dc.subject.lcsh Sediment transport en_US
dc.subject.lcsh Land-water ecotones en_US
dc.subject.lcsh Sand bars en_US
dc.title Assemblage structure and shallow-water habitat use by small-bodied fishes at lower Missouri River sandbars en_US
dc.type Thesis en_US
thesis.degree.discipline Fisheries and wildlife sciences en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name M.S. en_US
thesis.degree.level Masters en_US
dc.identifier.merlin .b61743707 en_US
dc.identifier.oclc 190648291 en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2007 Theses
dc.relation.ispartofcollection 2007 Freely available theses (MU)


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