The Effects of Pollutants on Marine Zooplankton at Deep Water Dumpsite 106: Preliminary Findings
The toxicity of duPont’s Grasselli waste to the marine copepods Pseudocalanus sp. and Centropages typicus has been evaluated in 96 hour bioassays. Test organisms were exposed to concentrations of waste ranging from 1 to 1000 ppm and the resulting effects on survival and feeding rates were monitored. Complete mortality of Pseudocalanus was observed at an exposure concentration of 1000 ppm; no mortality was detected among control organisms or those exposed to lesser concentrations. Significant reductions in filtration activity, however, were detected with exposure to 10 and 100 ppm. Significant mortality of Centropages was detected at 100 ppm and exposure to higher concentrations resulted in 100% mortality. Feeding rates of Centropages as measured by both consumption of Artemia nauplii and fecal pellet production rates were significantly lower than control values with exposure to 50 and 100 ppm. The findings of other investigators dealing with the effects of dumped wastes on marine zoo-plankton are discussed.
KeywordsFeeding Rate Phaeodactylum Tricornutum Woods Hole Oceanographic Institution Marine Copepod Copepod Population
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