Study of the Effects of Fresh Water on the Plankton, Benthos, and Nekton Assemblages of the Lavaca Bay system, Texas

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dc.acquisition-srcReview of GBNEP-19 reference list.; Dr. James Baker's Working Collectionen_US
dc.call-noSPEC COLL GBAY ACC#6913en_US
dc.contract-noTx Doc No. W600.8 St94een_US
dc.contributor.authorGilmore, G.en_US
dc.contributor.authorDailey, J.en_US
dc.contributor.authorGarcia, M.en_US
dc.contributor.authorHannebaum, N.en_US
dc.contributor.authorMeans, J.en_US
dc.contributor.otheren_US
dc.date.accessioned2010-02-15T17:26:33Z
dc.date.available2010-02-15T17:26:33Z
dc.date.issued1976en_US
dc.degreeen_US
dc.description113 pages; available for download at the link below.en_US
dc.description-otheren_US
dc.description.abstractThis study was typified by above-normal freshwater inflow. The average inflow into the Lavaca Bay system during this 30-month study (1944 cfs) was about 59% above normal (1,254 cfs). Inflow was greater than 4000 cfs during 10% (3months) of the study and daily inflow ranged from 100 to 94,949 cfs. A total of 156 phytoplankton taxa representing 6 divisions were identified. Phytoplankton taxa diversities generally declined with increasing freshwater inflow. Minimum phytoplankton density was associated with high river discharge (above 2000 cfs) while maximum standing crops occurred with blooms of small microflagellates and diatoms as the bay salinity began to stabilize afte rhigh inflow. Chlorophyll a values seemed negatively related to high river discharge (above 2000 cfs). A total of 201 zooplankton taxa representing 14 phyla wer identified. Barnacle nauplii, Acartia tonsa, and Oithona spp. populations comprised 80% of the total zooplankton standing crop. No significant correlations were found between zooplankton standing crops or taxa diversity and freshwater inflow; however, taxa diversity generally increased when river inflow increased to above 2000 cfs. Standing crops were inversely related to water temperature and directly related to salinity. A total of 169 benthos taxa representing 9 phyla were identified. The numerically most abundant benthos taxa included Littoridina sphinctostoma, Mediomastus californiensis, Rangia cuneata, Mulinia lateralis, and Streblospio benedicti. Benthos taxa diversity was positively related to bottom salinity and negatively related to bottom turbidity and nutrients. Taxa diversity declined from the high salinity lower bay to the low salinity upper bay and river areas. Benthos standing crops were not significantly correlated to freshwater inflow; however, standing crops were related to salinity, turbidity, total carbon, organic nitrogen, and nitrate. No relation between benthos populations and bottom sediment types was found. Benthos populations were generally lowest at dredged channel sites. A total of 70 nekton taxa representing 3 phyla were identified from trawl samples. The five numerically dominant species were Anchoa mitchilli, Micropogon undulatus, Brevoortia patronus, Penaeus setiferusm and Leiostomus xanthurus. Nekton populations appeared to be affected more by water temperature than by freshwater inflow.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeTexas coasten_US
dc.geo-codeTexasen_US
dc.geo-codeLavaca Bayen_US
dc.history10/19/04 eas; 2-3-09 kswen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/24800
dc.latitudeen_US
dc.locationGBIC Special Collectionen_US
dc.longitudeen_US
dc.notesTechnical Report to the Texas Water Development Board, January 1973-June 1975en_US
dc.placeAustin, TXen_US
dc.publisherTexas Parks and Wildlife Department, Coastal Fisheries Branchen_US
dc.relation.ispartofseries6913en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectbenthosen_US
dc.subjectmarine zooplanktonen_US
dc.subjectmarine phytoplanktonen_US
dc.subjectestuarine sedimentsen_US
dc.subjectestuaryen_US
dc.subjectestuariesen_US
dc.subjectestuarine ecologyen_US
dc.titleStudy of the Effects of Fresh Water on the Plankton, Benthos, and Nekton Assemblages of the Lavaca Bay system, Texasen_US
dc.typeTechnical Reporten_US
dc.universityen_US
dc.vol-issueen_US

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