Fish species diversity indices as indicators of pollution in Galveston Bay, Texas

dc.acquisition-srcReview of GBNEP-20 reference listen_US in Marine Scienceen_US
dc.contributor.authorBechtel, T.J.en_US
dc.contributor.authorCopeland, B.J.en_US
dc.contributor.otherContributions in Marine Scienceen_US
dc.descriptionpgs. 103-132en_US
dc.description.abstractFish species diversity indices (natural bels/individual) calculated for both fish weights and numbers from trawl collections were found to be useful indicators of environmental and pollution stress in Galveston Bay, Texas. Diversity values ranged from 2.1 in the Texas City-Galveston area to 0.02 in the Houston Ship Channel. Thus it is demonstrated that the concept of using species diversity to indicate adverse water quality conditions is applicable to the higher trophic levels of an estuary. Significant differences were detected in diversity between areas of the bay within each sampling period except in winter as well as between seasons. Also, significant differences between the weight and number indices existed, indicating that both biomass and numbers of organisms should be utilized when studying the diversity of higher trophic levels. Correlation of diversity with percent waste water indicated that those areas receiving the greatest amounts of effluents and toxic materials (up to 86% effluent by volume) exhibited the lowest mean annual diversities. Fish diversity in the Houston Ship Channel above Baytown, Texas can be used to predict diversity in the bay because of the linear relationship between distance and dilution of the ship channel effluent (19% effluent by volume calculated for Bolivar Roads. Sampling throughout the system indicated that the fish populations could be divided into somewhat separate communities, each structured as a response to environmental and pollution stress. In those areas receiving the greatest stress, the bay anchovy, Anchoa mitchilli, was the dominant species. These same areas also supported the fewest numbers of large individuals.en_US
dc.geo-codeGalveston Bayen_US
dc.geo-codeHouston Ship Channelen_US
dc.geo-codeTexas City Ship Channelen_US
dc.geo-codeBolivar Roadsen_US
dc.history3/9/05 easen_US
dc.locationGBIC Archives Collection; TAMUG Periodical Collectionen_US
dc.placePort Aransas, TXen_US
dc.publisherPort Aransas Marine Laboratory, University of Texas Marine Science Instituteen_US
dc.subjectspecies diversityen_US
dc.subjecttrawl netsen_US
dc.subjectmarine pollutionen_US
dc.subjectpollution effectsen_US
dc.subjectpollution toleranceen_US
dc.subjectmarine fishen_US
dc.subjectanchoa mitchellien_US
dc.subjectbay anchovyen_US
dc.subjectindicator speciesen_US
dc.titleFish species diversity indices as indicators of pollution in Galveston Bay, Texasen_US