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035 a| (Sirsi) o41745604;

035 a| (OCoLC)41745604;

043 a| n-us---;

049 a| EREE;

050 4 a| QH541.5.S24b| T56 1998;

100 1 a| Thomas, Cassondra R.,e| author.?| UNAUTHORIZED;

245 14 a| The use of network analysis to compare the nitrogen cycles of three salt marsh zones experiencing relative sea-level rise /c| by Cassondra R. Thomas.;

264 0 c| 1998.;

300 a| viii, 209 leaves :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| 1998;

500 a| Submitted to the faculty of the Department of Biology.;

500 a| Advisor: Robert R. Christian;

520 0 a| Network analysis was used to analyze the nitrogen cycles of three salt marshes on the east coast of the US.A., Great Sippewissett in Massachusetts, Upper Phillips Creek in Virginia, and Sapelo Island in Georgia A general nitrogen cycle model was constructed after a preliminary review of literature on the Great Sippewissett marsh. This model structure was used to construct 9 networks, one for each zone (creekbank, low marsh, and high marsh) within each marsh, largely using data collected from the literature on the 3 marshes The networks were analyzed to determine how nitrogen flowed through each zone The factors used for analysis included how nitrogen import was exported, how imports related to primary productivity, the amount of nitrogen that cycled within the system, and how mature each zone was These results were then compared between marsh zones to determine if trends existed. The Friedmans test, a nonparametric statistical test, was used to determine the significance of the trends. When precipitation and Tidal particulate nitrogen (PN) were the imports, export via burial and denitrification significantly increased in importance moving across the marsh from the creekbank to the high marsh. Nitrogen cycling also significantly increased from creekbank to high marsh. The maturity of marsh was measured using the relative ascendency index and a multicriteria analysis with the expectation that maturity would be highest in the low marsh. Contrary to expectation, it was determined that maturity increased moving across the marsh from the creekbank to the high marsh These patterns were used to evaluate how a marsh may respond to increasing relative sea-level rise. Key factors are the slope and sediment supply. If the marsh is able to migrate overland, increasing the high marsh zone, nitrogen cycling will increase on a per unit area basis, and the marsh will display more characteristics of a mature ecosystem. If, however, the marsh stalls because of a steep slope, the amount of cycling will decrease on a per unit area basis, and the marsh will act less mature If the supply of sediment is great and the marsh progrades toward the sea, the nitrogen cycling and maturity of the marsh may decrease.;

504 a| Includes bibliographical references (leaves 127-138).;

650 0 a| Salt marsh ecologyz| Atlantic Coast (U.S.)=| ^A354628;

650 0 a| Nitrogen cycle.=| ^A91164;

650 0 a| Seashore ecologyz| Atlantic Coast (U.S.)=| ^A38109;

650 7 a| Nitrogen cycle.2| fast0| (OCoLC)fst01038072;

650 7 a| Salt marsh ecology.2| fast0| (OCoLC)fst01104280;

650 7 a| Seashore ecology.2| fast0| (OCoLC)fst01110404;

655 7 a| dissertations.2| aat0| (CStmoGRI)aatgf300028029;

655 7 a| Academic theses.2| fast0| (OCoLC)fst01726453;

655 7 a| Academic theses.2| lcgft;

655 7 a| Thèses et écrits académiques.2| rvmgf0| (CaQQLa)RVMGF-000001173;

700 1 a| Christian, Robert R.q| (Robert Raymond),d| 1947-e| degree supervisor.1| https://id.oclc.org/worldcat/entity/E39PCjyx3yhgwxjTYRppyY4tjy=| ^A168653;

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

856 41 z| Access via ScholarShipu| http://hdl.handle.net/10342/11529;

949 a| Click on web addressw| asish| joyner101;

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The use of network analysis to compare the nitrogen cycles of three salt marsh zones experiencing relative sea-level rise / by Cassondra R. Thomas.

Author/creator	Thomas, Cassondra R. author.
Other author	Christian, Robert R. (Robert Raymond), 1947- degree supervisor.
Other author	East Carolina University. Department of Biology.
Format	Theses and dissertations
Production	1998.
Description	viii, 209 leaves : illustrations ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Salt marsh ecology--Atlantic Coast (U.S.). Nitrogen cycle. Seashore ecology--Atlantic Coast (U.S.).

Subject	Network analysis was used to analyze the nitrogen cycles of three salt marshes on the east coast of the US.A., Great Sippewissett in Massachusetts, Upper Phillips Creek in Virginia, and Sapelo Island in Georgia A general nitrogen cycle model was constructed after a preliminary review of literature on the Great Sippewissett marsh. This model structure was used to construct 9 networks, one for each zone (creekbank, low marsh, and high marsh) within each marsh, largely using data collected from the literature on the 3 marshes The networks were analyzed to determine how nitrogen flowed through each zone The factors used for analysis included how nitrogen import was exported, how imports related to primary productivity, the amount of nitrogen that cycled within the system, and how mature each zone was These results were then compared between marsh zones to determine if trends existed. The Friedmans test, a nonparametric statistical test, was used to determine the significance of the trends. When precipitation and Tidal particulate nitrogen (PN) were the imports, export via burial and denitrification significantly increased in importance moving across the marsh from the creekbank to the high marsh. Nitrogen cycling also significantly increased from creekbank to high marsh. The maturity of marsh was measured using the relative ascendency index and a multicriteria analysis with the expectation that maturity would be highest in the low marsh. Contrary to expectation, it was determined that maturity increased moving across the marsh from the creekbank to the high marsh These patterns were used to evaluate how a marsh may respond to increasing relative sea-level rise. Key factors are the slope and sediment supply. If the marsh is able to migrate overland, increasing the high marsh zone, nitrogen cycling will increase on a per unit area basis, and the marsh will display more characteristics of a mature ecosystem. If, however, the marsh stalls because of a steep slope, the amount of cycling will decrease on a per unit area basis, and the marsh will act less mature If the supply of sediment is great and the marsh progrades toward the sea, the nitrogen cycling and maturity of the marsh may decrease.
General note	Submitted to the faculty of the Department of Biology.
General note	Advisor: Robert R. Christian
Dissertation note	M.S. East Carolina University 1998
Bibliography note	Includes bibliographical references (leaves 127-138).
Genre/form	dissertations.
Genre/form	Academic theses.
Genre/form	Academic theses.
Genre/form	Thèses et écrits académiques.

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