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Abstract Detail

Phycological Section

Anzola, Nestor Raul [1], Pessoney, George F. [1], Hernandez, Carmen Liliana [1].

Algae From the Pascagoula River Basin: Phytoplankton Responses to Water Chemistry Dynamic in Small Streams.

PHYTOPLANKTON monitoring has taken place in headwater streams of South Mississippi since 1993. The sampling protocol has been set up to monitor on a seasonal basis all water exiting the boundaries of Camp Shelby, the largest National Guard and Reserve training facility in the continental USA. Since there is not any creek entering or crossing the camp, the water exiting reflects the operations within the facility. Drastic changes in the phytoplankton structure or a spike in one of the measured chemical parameters would identify any acute spill, which entered a water head. From 1996 to 2005 analyses were conducted in water for 18 parameters and phytoplankton density and composition at 28 permanent locations. Interactions of water quality variables in determining density and richness of phytoplankton within the streams were analyzed. The phytoplankton community was characterized by high genera richness and low abundance. A total of 149 algal genera included in six algal divisions were identified. Chlorophyta and Chrysophyta were the dominant taxa in the phytoplankton. Nuisance algae related to harmful algal blooms in freshwater systems were sporadic or not detectable. The most frequent algal genera were the diatoms Eunotia, Navicula, Nitzchia, Surirella, and Tabellaria. Among the green algae, Closterium, Mougeotia, and Ankistrodesmus, were persistent members of the algal community. Temperature, phosphate concentration, and storm events were the statiscally significant environmental factors that controlled seasonal variations in phytoplankton density over time. Algal richness in the system was driven by water temperature and flow.

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1 - University of Southern Mississippi, Department of Biological Sciences, 118 College Drive #5018, Hattiesburg, Mississippi, 39406-5018, USA

water quality.

Presentation Type: Poster:Posters for Sections
Session: 48-106
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:876

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