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035 a| (Sirsi) o82458828;

035 a| (OCoLC)82458828;

043 a| n-us-nc;

049 a| EREE;

050 4 a| QK495.A48b| J64 2004;

100 1 a| Johnson, Sarah E.c| (Plant ecologist),e| author.=| ^A1471301;

245 13 a| An assessment of the nearest associates and the effects of competition on the threatened dune annual, Amaranthus pumilus Rafinesque (Amaranthaceae) /c| by Sarah E. Johnson.;

264 0 c| 2004.;

300 a| 98 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| 2004;

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

500 a| Advisor: Claudia L. Jolls;

520 3 a| The influence of competition in population dynamics and community structure is not well understood for unproductive and stressful environments such as the coastal dune system. Amaranthus pumilus is a rare dune annual that establishes in the highly dynamic foredune habitat of the U.S. Atlantic Coast and is described as a fugitive species that is associated with habitat free of possible competitors. I assessed the potential for competition with associates using a point-centered quarter sampling regime and determined that the annual Cakile edentula, along with the perennials Iva imbricata and Uniola panicualta, were among the most frequent near associates of A. pumilus. The effects of neighbors on growth of A. pumilus were assessed by linear size metrics, an index of total competitive response and relative growth rate. Iva imbricata neighbors had the strongest effect on A. pumilus success, followed by U. paniculata, C. edentula and A. pumilus conspecifics. Negative effects by interspecific interactions were stronger and occurred sooner than did effects by intraspecific neighbors. Interspecific competitive exclusion of target A. pumilus plants occurred in the presence of perennial neighbors. Intraspecific competition, however, did not affect survival of A. pumilus, but it did result in reduced growth of targets through time. These data suggest that competition may influence the distribution of Amaranthus pumilus at the upper limit of its zone of distribution on the beach. This research provides further experimental support for reduced competitive ability of annual species associated with unproductive environments.;

504 a| Includes bibliographical references (leaves 89-98).;

650 0 a| Amaranthsz| North Carolinaz| Cape Hatteras National Seashore.=| ^A862354;

650 0 a| Amaranthsz| North Carolinaz| Cape Lookout National Seashore.=| ^A862354;

650 0 a| Sand dune plantsz| North Carolina.=| ^A376829;

650 0 a| Plant competitionz| North Carolina.=| ^A244376;

650 7 a| Amaranths.2| fast0| (OCoLC)fst00806639;

650 7 a| Plant competition.2| fast0| (OCoLC)fst01065349;

650 7 a| Sand dune plants.2| fast0| (OCoLC)fst01104855;

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| Jolls, Claudia Lee,e| degree supervisor.=| ^A1268116;

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

856 41 z| Access via ScholarShipu| http://hdl.handle.net/10342/12528;

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

949 a| Click on web addressw| asish| hsl111;

994 a| C0b| ERE;

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999 a| ASK AT SPECIAL COLLECTIONS DESKw| ASISc| 1i| MQ1883392l| JSCJTHDm| JOYNERr| Ys| Yt| JSCJTHDu| 2/9/2007x| ETDz| JSPECCOLLo| .STAFF. 0;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 1069623-3001l| JNETm| JOYNERr| Ys| Yt| JNE3ETDu| 11/19/2024x| ETDz| JERESOURCE;

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An assessment of the nearest associates and the effects of competition on the threatened dune annual, Amaranthus pumilus Rafinesque (Amaranthaceae) / by Sarah E. Johnson.

Author/creator	Johnson, Sarah E. author.
Other author	Jolls, Claudia Lee, degree supervisor.
Other author	East Carolina University. Department of Biology.
Format	Theses and dissertations
Production	2004.
Description	98 leaves : illustrations ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Amaranths--North Carolina. --Cape Hatteras National Seashore. Amaranths--North Carolina. --Cape Lookout National Seashore. Sand dune plants--North Carolina. Plant competition--North Carolina.

Summary	The influence of competition in population dynamics and community structure is not well understood for unproductive and stressful environments such as the coastal dune system. Amaranthus pumilus is a rare dune annual that establishes in the highly dynamic foredune habitat of the U.S. Atlantic Coast and is described as a fugitive species that is associated with habitat free of possible competitors. I assessed the potential for competition with associates using a point-centered quarter sampling regime and determined that the annual Cakile edentula, along with the perennials Iva imbricata and Uniola panicualta, were among the most frequent near associates of A. pumilus. The effects of neighbors on growth of A. pumilus were assessed by linear size metrics, an index of total competitive response and relative growth rate. Iva imbricata neighbors had the strongest effect on A. pumilus success, followed by U. paniculata, C. edentula and A. pumilus conspecifics. Negative effects by interspecific interactions were stronger and occurred sooner than did effects by intraspecific neighbors. Interspecific competitive exclusion of target A. pumilus plants occurred in the presence of perennial neighbors. Intraspecific competition, however, did not affect survival of A. pumilus, but it did result in reduced growth of targets through time. These data suggest that competition may influence the distribution of Amaranthus pumilus at the upper limit of its zone of distribution on the beach. This research provides further experimental support for reduced competitive ability of annual species associated with unproductive environments.
General note	Presented to the faculty of the Department of Biology.
General note	Advisor: Claudia L. Jolls
Dissertation note	M.S. East Carolina University 2004
Bibliography note	Includes bibliographical references (leaves 89-98).
Genre/form	dissertations.
Genre/form	Academic theses.
Genre/form	Academic theses.
Genre/form	Thèses et écrits académiques.

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An assessment of the nearest associates and the effects of competition on the threatened dune annual, Amaranthus pumilus Rafinesque (Amaranthaceae) / by Sarah E. Johnson.

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