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Comparative analysis of the benthic infauna and sediment for two small estuaries in Connecticut / Joseph G. Dunn

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Identifier	Thesis 1488
Author	Dunn, Joseph G
Title	Comparative analysis of the benthic infauna and sediment for two small estuaries in Connecticut / Joseph G. Dunn
Publisher	Central Connecticut State University
Date	1998
Resource Type	Master's Thesis
Notes	Estuaries are rich in nutrients, such as nitrogen which may limit plant growth in coastal water bodies. Organic enrichment caused by allochthonous inputs of nitrogen has been shown to have adverse affects on water quality in estuaries. When estuaries are under pressure from cultural eutrophication, opportunistic species of benthic infauna can be found. Therefore, knowledge of the benthic infauna could be useful in establishing baseline assessments regarding water quality in estuaries. The lower portions of the Lieutenant and Black Hall Rivers are small estuaries located in Old Lyme, Connecticut. A baseline assessment of the macroinfaunal assemblages and the physical sediment characteristics was conducted within these estuaries. Five stations in the Black Hall River and six stations in the Lieutenant River were sampled in September 1996. A total of 24 taxa and 3024 individuals were identified from 132 cores. Annelids were the dominant taxon found in both estuaries, isopods ranked second and amphipods ranked third in total number of individuals. One-way analysis of variance revealed that the abundance of benthic infauna in the Black Hall River was significantly different from that in the Lieutenant River. Diversity, richness and evenness indices were different for both estuaries. Margalef (R1) and Menhinick (R2) mean richness indices on the Black Hall River were R1=1.34 and R2=0.26, respectively. The mean Shannon-Weiner diversity value for the Black Hall River was H'=4.83. The Black Hall River Pielou mean evenness index value was J'= 0.75. On the Lieutenant River, the Margalef (R1) and Menhinick (R2) indices were R1=1.00 and R2=0.24. The mean Shannon-Weiner index for the Lieutenant River was H'=4.33. The Pielou evenness value was J'=0.79. Variation in species composition between estuaries reflected different environmental conditions. Fauna at sites with larger grained sediment with higher water flow and erosion were characterized by lower richness and evenness values. Stations richer in organic material and smaller grained sediment with reducing conditions had fewer species present. Stations having medium-grained sediment and lower organic content had a greater number of species. In addition to sediment characteristics and water currents, other factors may have contributed to the diversity of the macroinfaunal assemblages.
Subject	Water quality monitoring stations -- Connecticut Environmental monitoring -- Connecticut
Department	Department of Biological Sciences
Advisor	Penniman, Clayton A.
Type	Text
Digital Format	application/pdf
Language	eng
OCLC number	40222117
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Comparative analysis of the benthic infauna and sediment for two small estuaries in Connecticut / Joseph G. Dunn

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