Benthic Macroinvertebrate Metacommunity Structure of the Guadalupe River Basin, TX

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dc.contributor.advisorSchwalb, Astrid N.
dc.contributor.advisorNowlin, Weston H.
dc.contributor.authorZawalski, Rebecca A.
dc.contributor.committeeMemberGrubh, Archis
dc.date.accessioned2017-09-06T14:06:05Z
dc.date.available2017-09-06T14:06:05Z
dc.date.issued2017-08
dc.description.abstractBenthic macroinvertebrates (BMI) are widely used as bio-indicators for local in-stream quality. However, local community structure can be affected by smaller scale (local) environmental conditions and larger scale processes. I assessed the abundance and diversity of BMI and their relationship with local in-stream conditions, regional patterns of land-use/land cover (LULC), and large scale physiographic gradients across the Guadalupe River System, a large basin (3,256 km2) in Central Texas. Macroinvertebrates, water quality, and habitat conditions across 28 sites in the Guadalupe River and its main tributaries were sampled. Highest species diversity occurred near the headwaters, and decreased downstream. Pollution tolerance levels increased downstream and followed an increasing agriculture gradient. Landscape factors explained a large proportion of variation in macroinvertebrate community structure (38%), but 16% of it was spatially structured (shared with spatial factors latitude and longitude) and 4% was explained by spatial factors alone. Local environmental factors were strongly correlated with landscape factors and explained similar amount of variation as landscape factors. My study highlights the importance of incorporating physiographic gradients when examining local and regional diversity and composition of BMI communities, especially in large complex watersheds. My results will help develop more effective monitoring programs for larger river systems.
dc.description.departmentBiology
dc.formatText
dc.format.extent51 pages
dc.format.medium1 file (.pdf)
dc.identifier.citationZawalski, R. A. (2017). <i>Benthic macroinvertebrate metacommunity structure of the Guadalupe River Basin, TX</i> (Unpublished thesis). Texas State University, San Marcos, Texas.
dc.identifier.urihttps://hdl.handle.net/10877/6798
dc.language.isoen
dc.subjectBenthic
dc.subjectMacroinvertebrate
dc.subjectMetacommunity
dc.subjectGuadalupe
dc.subjectTexas
dc.subject.lcshStream invertebrates--Texas--Guadalupe Riveren_US
dc.titleBenthic Macroinvertebrate Metacommunity Structure of the Guadalupe River Basin, TX
dc.typeThesis
thesis.degree.departmentBiology
thesis.degree.disciplinePopulation and Conservation Biology
thesis.degree.grantorTexas State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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