Rodriguez, A. E. University of Puerto Rico, auryro@coqui.net
Garcia, J. E. University of Puerto Rico, renigar@caribe.net

 
TAXONOMIC COMPOSITION AND SEASONAL ABUNDANCE OF ZOOPLANKTON ENTRAINED BY A THERMOELECTRIC POWER PLANT IN SAN JUAN BAY, PUERTO RICO
 
The taxonomic structure and seasonal abundance of entrained holoplankton and meroplankton (including ichthyoplankton) by a thermoelectric power plant in San Juan Bay was studied from October 1993 to September 1994. Barnacle larvae and calanoid copepods were the numerically dominant taxa of the total entrained zooplankton. Ichthyoplankton accounted for 10 % of the total zooplankton. Fish eggs represented 91% of the total ichthyoplankton. Clupeiform eggs were the dominant type entrained. Larval anchovies showed a high relative abundance, accounting for more than 52% of total larvae. Significantly higher abundance of zooplankton was evidenced during the months of May, June and September, reflecting a mild seasonal pattern associated with rainfall. Monthly differences of fish eggs abundance were only related to lower values during October 1993 and September 1994. Monthly variability patterns of zooplankton abundance was characterized by ephemeral peaks at different stations. Such inconsistent pattern suggests that patchiness, at a frequency shorter than the sampling scheme, may be influencing the observed distributions. It must be underscored that in the high water temperatures of tropical systems a season of high productivity may be very short, and may occur at unpredictable times and lengths during a year.
 
Day: Wednesday, Feb. 3
Time: Poster
Location: Sweeney Center
 
Code: CS59WE1227S