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001 ocm02925592;

003 OCoLC;

005 20250829015641.0;

008 770429s1976 ncuaf b 000 0 eng d;

035 a| (Sirsi) o02925592;

035 a| (OCoLC)2925592;

043 a| n-us-nc;

049 a| EREE;

050 4 a| QH541.3b| .Z9x;

100 1 a| Zamuda, Craig Dennis,e| author.?| UNAUTHORIZED;

245 10 a| Seasonal growth and decomposition of V̲a̲l̲l̲i̲s̲n̲e̲r̲i̲a̲ a̲m̲e̲r̲i̲c̲a̲n̲a̲ in the Pamlico River Estuary /c| by Craig Dennis Zamuda.;

264 0 c| 1976.;

300 a| 77 leaves, 2 leaves of plates :b| illustrations ;c| 28 cm;

336 a| textb| txt2| rdacontent;

337 a| unmediatedb| n2| rdamedia;

338 a| volumeb| nc2| rdacarrier;

502 b| M.S.c| East Carolina Universityd| 1976;

500 a| "A thesis presented to the faculty of the Department of Biology ... in partial fulfillment of the requirements for the degree Master of Science in Biology.";

500 a| Advisor: Graham J. Davis;

520 3 a| Seasonal rates of growth and production and of inorganic and organic matter losses were determined for Vallisneria americana Michx. in the Pamlico River estuary of North Carolina. A direct marking technique was utilized to measure in situ changes in biomass and leaf dynamics for plants from two dissimilar locations. The upriver study site was characterized by extensive plant beds and low salinities (0-5 ⁰/oo) while at the downriver site, plants were less dense and exposed to higher salinities (2-11 ⁰/oo). The mean rate of leaf elongation was 5.6 mm/day for both locations, although elongation was as rapid as 9 mm/day. Plants produced a new leaf on the seasonal average of every 9.9 days, with greater rates for the downriver plants (8.2 days) as compared to those upriver (11.6 days). The seasonal mean production value was 2.3 mg ODW (organic dry weight)/plant-day, with values generally greater downriver. A July depression in growth and production coincided with peak flower and fruit production, subsequently increasing to maximum values in August. Turnover rates averaged 1.5%/day resulting in a total plant turnover of 67 days. Plant densities increased to an August maximum of 280 plants/m^ with a seasonal mean of 200 plants/m². This resulted in a production estimate of 0.47 g ODW/m²-day or a seasonal value of 115 g ODW/m². Total estuarine production was approximately 403 MT ODW. Plants were harvested seasonally from the above stations and maintained submerged in nylon bags (mesh=1mm), with a littoral and midriver decay site at each station. Summer decay was rapid with as much as 70% of the organic matter lost within the first two weeks. Decay coefficients for spring and summer material (k=19.5) were greater than winter material (k=10.0). Newly harvested plants had maximum levels of inorganic nutrients in winter: N, 4.3% ODW; P, 0.6%; Ca, 0.5%; Mg, 0.4%; K, 3.7%; and Na, 2.3%. During decay N and P concentrations remained essentially constant or gradually increased on the basis of ODW remaining. Sodium and K levels fluctuated, with concentrations increasing in spring and decreasing throughout the other seasons. Calcium levels initially increased and then decreased while Mg concentrations remained constant except for a summer decline.;

504 a| Includes bibliographical references (leaves 73-77).;

650 0 a| Biological productivity.=| ^A26344;

650 0 a| Estuarine ecology.=| ^A45439;

651 0 a| Pamlico River (N.C.)=| ^A86588;

650 7 a| Biological productivity.2| fast0| (OCoLC)fst00832287;

650 7 a| Estuarine ecology.2| fast0| (OCoLC)fst00915685;

700 1 a| Davis, Graham J.,e| degree supervisor.1| https://id.oclc.org/worldcat/entity/E39PCjJCHXTCtKKxRKQvW7RYKb=| ^A86589;

710 2 a| East Carolina University.b| Department of Biology.=| ^A637467;

856 41 z| Access via ScholarShipu| http://hdl.handle.net/10342/11592;

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Seasonal growth and decomposition of V̲a̲l̲l̲i̲s̲n̲e̲r̲i̲a̲ a̲m̲e̲r̲i̲c̲a̲n̲a̲ in the Pamlico River Estuary / by Craig Dennis Zamuda.

Author/creator	Zamuda, Craig Dennis author.
Other author	Davis, Graham J., degree supervisor.
Other author	East Carolina University. Department of Biology.
Format	Theses and dissertations
Production	1976.
Description	77 leaves, 2 leaves of plates : illustrations ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Biological productivity. Estuarine ecology. Pamlico River (N.C.)

Summary	Seasonal rates of growth and production and of inorganic and organic matter losses were determined for Vallisneria americana Michx. in the Pamlico River estuary of North Carolina. A direct marking technique was utilized to measure in situ changes in biomass and leaf dynamics for plants from two dissimilar locations. The upriver study site was characterized by extensive plant beds and low salinities (0-5 ⁰/oo) while at the downriver site, plants were less dense and exposed to higher salinities (2-11 ⁰/oo). The mean rate of leaf elongation was 5.6 mm/day for both locations, although elongation was as rapid as 9 mm/day. Plants produced a new leaf on the seasonal average of every 9.9 days, with greater rates for the downriver plants (8.2 days) as compared to those upriver (11.6 days). The seasonal mean production value was 2.3 mg ODW (organic dry weight)/plant-day, with values generally greater downriver. A July depression in growth and production coincided with peak flower and fruit production, subsequently increasing to maximum values in August. Turnover rates averaged 1.5%/day resulting in a total plant turnover of 67 days. Plant densities increased to an August maximum of 280 plants/m^ with a seasonal mean of 200 plants/m². This resulted in a production estimate of 0.47 g ODW/m²-day or a seasonal value of 115 g ODW/m². Total estuarine production was approximately 403 MT ODW. Plants were harvested seasonally from the above stations and maintained submerged in nylon bags (mesh=1mm), with a littoral and midriver decay site at each station. Summer decay was rapid with as much as 70% of the organic matter lost within the first two weeks. Decay coefficients for spring and summer material (k=19.5) were greater than winter material (k=10.0). Newly harvested plants had maximum levels of inorganic nutrients in winter: N, 4.3% ODW; P, 0.6%; Ca, 0.5%; Mg, 0.4%; K, 3.7%; and Na, 2.3%. During decay N and P concentrations remained essentially constant or gradually increased on the basis of ODW remaining. Sodium and K levels fluctuated, with concentrations increasing in spring and decreasing throughout the other seasons. Calcium levels initially increased and then decreased while Mg concentrations remained constant except for a summer decline.
General note	"A thesis presented to the faculty of the Department of Biology ... in partial fulfillment of the requirements for the degree Master of Science in Biology."
General note	Advisor: Graham J. Davis
Dissertation note	M.S. East Carolina University 1976
Bibliography note	Includes bibliographical references (leaves 73-77).

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Seasonal growth and decomposition of V̲a̲l̲l̲i̲s̲n̲e̲r̲i̲a̲ a̲m̲e̲r̲i̲c̲a̲n̲a̲ in the Pamlico River Estuary / by Craig Dennis Zamuda.

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