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dc.contributor.advisorGroeger, Alan
dc.contributor.authorPennington, Toni ( Orcid Icon 0000-0003-2136-3567 )
dc.date.accessioned2022-02-21T14:17:50Z
dc.date.available2022-02-21T14:17:50Z
dc.date.issued1999-05
dc.identifier.citationPennington, T. (1999). Identifying sediment nutrients that further characterize the habitat associated with the endangered Texas wildrice (Zizania texana Hitch) (Unpublished thesis). Southwest Texas State University, San Marcos, Texas.
dc.identifier.urihttps://digital.library.txstate.edu/handle/10877/15393
dc.description.abstractInterstitial water samplers (peepers) were used to examine porewater nutrients associated with a particular stand of the endangered aquatic macrophyte, Texas wildrice (Zizania texana Hitchcock), in the San Marcos River in June, August, and November 1998. Peepers were oriented vertically down into the sediments to capture water in discrete chambers at 2.5 cm intervals from approximately 15 cm above the sediment-water interface and to a depth of 15 cm into the sediments. They were deployed under the leaf blades (inside the stand) and adjacent to or upstream of the stand (outside the stand). Samples were analyzed for NON and soluble reactive phosphorus (SRP). Water column concentrations were around 1.0 mg L-1 N0N and 10 µg L-1 SRP. Porewater concentrations were <0.4 mg L-1 N0N and between 10 and 58 µg L-1 SRP. Porewater phosphorus concentrations were highly patchy indicating a dynamic sediment structure in the river channel. Significant differences between nutrient concentrations were predominately observed between the water column and porewater and less common between inside and outside the stand. A nutrient limitation experiment using low P (500 µg L-1), high P (1000 µg L-1), and N+P (1.5 mg L-1 N + 500 µg L-1) showed a slight increase in plant mass between P treatments (p<0.10); however, the relationship between plant mass and enrichment concentration was weak (r=0.44). Only a slight effect on plant mass was observed in the N-enriched plants (p=0.08), but not leaf lengths. The lowest r:s ratio was observed in the N+P enrichment.
dc.formatText
dc.format.extent53 pages
dc.format.medium1 file (.pdf)
dc.language.isoen
dc.subjectZizania texana
dc.subjectWild rice
dc.subjectNutrition
dc.subjectHabitats
dc.subjectInterstitial nutrients
dc.subjectSediments
dc.titleIdentifying sediment nutrients that further characterize the habitat associated with the endangered Texas wildrice (Zizania texana Hitch)
txstate.documenttypeThesis
dc.contributor.committeeMemberPower, Paula
dc.contributor.committeeMemberDoyle, Robert
thesis.degree.departmentBiology
thesis.degree.grantorSouthwest Texas State University
thesis.degree.levelMasters
thesis.degree.levelMaster of Science
txstate.accessrestricted
dc.description.departmentBiology


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