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Home CCSU Theses & Dissertations Analyses of macrophyte interactions in a eutrophic lake and in experimental microcosms.

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Analyses of macrophyte interactions in a eutrophic lake and in experimental microcosms.

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Identifier	Thesis 1681
Author	Dopirak, William J., Jr
Title	Analyses of macrophyte interactions in a eutrophic lake and in experimental microcosms.
Publisher	Central Connecticut State University
Date	2002
Resource Type	Master's Thesis
Notes	A comprehensive survey of aquatic plant communities in Pickerel Lake, Colchester/East Haddam, Connecticut, was conducted during the growing season of most regional macrophyte species (May 2001 to October 2001). Five weed maps were constructed to analyze changes of rooted macrophyte assemblages. The extent of these assemblages was documented in the field, utilizing a GARMIN GPS 75 data collection system. To assess how two of the predominate species of the survey react to limited resources; replacement series experimental designs were developed. This method studies interactions between two plant species as they are limited by space. Thirty microcosms were established using - v - 150 variable-leaved milfoil (Myriophyllum heterophyllum Michx.) plants and 150 fanwort (Cabomba caroliniana Gray), grown in monocultures and varied mixtures. Twelve freshwater macrophyte species were identified during this survey. Three species of free-floating macrophytes, four species of rooted floating-leaf plants, and five species of rooted submersed aquatic plants contribute to macrophyte productivity in Pickerel Lake. Eight species of rooted macrophytes were illustrated on the weed maps series. The dominant species were Myriophyllum heterophyllum and Cabomba caroliniana. Beginning in May 2001, variable-leaved milfoil was found to blanket the majority of the lake bottom. Also beginning in May 2001 (and present throughout the study), water shield, Brasenia schreberi Gmel., spatterdock, Nuphar variegata L., and white water lily Nymphaea odorata L., appeared in the northern and western coves of Pickerel Lake. From June 2001 through August 2001 fanwort began to gradually encroach on the milfoil, particularly on the northeastern side of the lake. Scattered areas, free of rooted aquatic vegetation, began to appear from mid-summer to early autumn. Appearing in July 2001, and present at the conclusion of this project, water-thread pondweed, Potamogeton diversifolius Raf., occupied a cleared area (previously occupied by milfoil) off the shores of the lake's southern peninsula.
Subject	Biology
Department	Department of Biological Sciences
Advisor	Penniman, Clayton A.
Type	Text
Digital Format	application/pdf
Language	eng
OCLC number	713733975
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Analyses of macrophyte interactions in a eutrophic lake and in experimental microcosms.

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