Observations of Freshwater Ponds on Carroll Island and Gunpowder Neck, Maryland, with Emphasis on the Zooplankton.
Technical rept. Apr 70-Jan 71,
EDGEWOOD ARSENAL MD
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A limnological study was initiated in April 1970 as part of an ecological research program at Edgewood Arsenal, Maryland. Seasonal observations of zooplankton, physicochemical variable, and aquatic vegetation from a pond on the Carroll Island test area were compared with those from a pond on Gunpowder Neck. The Gunpowder Neck pond retained water throughout the study the Carroll Island pond was dry from mid-September until late November. Photosynthetic activities of algae probably influenced physicochemical factors including free carbon dioxide, dissolved oxygen, and hardness these variables fluctuated irregularly in both ponds during the 10-month investigation. Each pond contained a distinct assemblage of zooplankters, which was influenced by amounts of aquatic vegetation. The diversity of zooplankton in the ponds was nearly equal, but the Carroll Island pond contained greater numbers of organisms. A congeneric occurrence of two calanoid copepods Diaptomus birgei Marsh and D. sanguineus Forbes was found in May in the Carroll Island pond. Author
- Hydrology, Limnology and Potamology