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The effects of human disturbance on ...

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The effects of human disturbance on alien plant distributions and primary dune vegetation of the Georgia Sea Islands.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The effects of human disturbance on alien plant distributions and primary dune vegetation of the Georgia Sea Islands./
作者:	Rodgers, John Canttrell, III.
面頁冊數:	135 p.
附註:	Director: Kathleen Conn Parker.
Contained By:	Dissertation Abstracts International60-11A.
標題:	Biology, Botany. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9949531
ISBN:	9780599519374

The effects of human disturbance on alien plant distributions and primary dune vegetation of the Georgia Sea Islands.
Rodgers, John Canttrell, III.

The effects of human disturbance on alien plant distributions and primary dune vegetation of the Georgia Sea Islands. - 135 p.

Director: Kathleen Conn Parker.

Thesis (Ph.D.)--University of Georgia, 1999.

This study investigates the effects of human disturbance on the vegetation of the Georgia Sea Islands (GSI). Vegetation composition and environmental stress variables (soil properties and salt spray) were measured in sites categorized by human-modification and environmental-stress levels on two tourist islands (Jekyll Island and St. Simons Island) and two national wildlife refuge islands (Blackbeard Island and Wassaw Island). Human disturbance had a significant affect on the distribution of alien plant species. Alien abundance was significantly greater in human-disturbed habitats on all islands and islands with different levels of land-use (tourist islands versus non-tourist islands) had similar mean cover of alien plants in disturbed sites. Alien abundance was also much greater in the less stressful forest habitat, where disturbance agents created open ground and increased available light. The more stressful primary dune habitat had significantly less alien cover presumably because human disturbance agents did not mitigate the harsh environmental conditions of this habitat (salt-spray and poor soils). It appears, then, that human disturbance increases alien cover in general, but in environments where the stress levels are not mitigated, human disturbance does little to foster alien invasions. Human disturbance also had a significant affect on the overall vegetation composition of the primary dune habitat. The tourist islands in general and the human disturbed primary dune sites within all islands had significantly lower cover of native dune-building grasses (Uniola paniculata and Panicum amarum) but had higher cover of other native dune taxa, native generalists taxa, and alien species. Copper concentrations, an element that is known to decrease plant productivity of dune-building taxa, were also greater in the human disturbed primary dune sites. Because primary dune morphology is inherently related to the vegetation that colonizes it, human disturbance may be indirectly reducing the stability of primary dunes by altering the dune vegetation composition.

ISBN: 9780599519374Subjects--Topical Terms:

1017825
Biology, Botany.

The effects of human disturbance on alien plant distributions and primary dune vegetation of the Georgia Sea Islands.
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