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Effects of rainfall, recruitment, and the operation of the Cedar Bayou Electric Generating Station (Baytown, Texas) on the dynamics of fish and macrocrustacean communities in the brackish intake and discharge waters
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The impact of the Cedar Bayou Electric Generating Station upon fishes and macrocrustaceans in the intake area, discharge canal, and cooling lake during 1972-1979 was evaluated. Data used to determine relative abundance, biomass, distribution, species composition, and diversity were collected during 1977-1978 by monthly trawling, trammel-netting, and seining. These data were pooled with data from other similar studies between 1972 and 1979 to evaluate the long-term effects of the power plant. In addition, the simultaneous effects of rainfall, recruitment, and species interaction were assessed. Great year-to-year variation occurred in apparent abundance of dominant species. Variation was correlated with rainfall, conductivity, discharge-canal temperature, difference in discharge canal and intake area temperatures ((DELTA)T), recruitment, fish kills, competition, and predation. Moreover, most species or species groups were seasonal in occurrence. A trend toward increased abundance of blue crabs, white shrimp, and brown shrimp in the intake area was attributed to reverse flow of Cedar Bayou caused by the power plant and consequent improvement in habitat. Number of fish species seemed to increase in the intake area with time, and Shannon-Weiner diversity, richness, and evenness seemed directly related to conductivity. Richness was related also to season.In the cooling lake, white shrimp and brown shrimp decreased over time. Abundances of species in the cooling lake were correlated with recruitment (Atlantic croaker), discharge-canal temperature (brown shrimp), (DELTA)T (Gulf menhaden, hardhead catfish, non-migratory forage fish, and brown shrimp), rainfall (Atlantic croaker), fish kills (predatory fishes), competition (Atlantic croaker and hardhead catfish), and predation (Gulf menhaden, forage fish, white shrimp, and brown shrimp). Number of fish species increased with time in the cooling lake. Season was an important factor for Shannon-Weiner diversity, species richness, and species evenness, while conductivity was an important factor influencing Shannon-Weiner diversity; (DELTA)T affected species richness.
SubjectWildlife and Fisheries Sciences
1982 Dissertation J66
Cedar Bayou Generating Station
Effect of water quality on
Effect of water quality on
Johnson, Darlene Ramon (1982). Effects of rainfall, recruitment, and the operation of the Cedar Bayou Electric Generating Station (Baytown, Texas) on the dynamics of fish and macrocrustacean communities in the brackish intake and discharge waters. Texas A&M University. Texas A&M University. Libraries. Available electronically from
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