東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

The establishment, expansion and eco...

Stanton, Lee Ellis.

FindBook

Google Book

Amazon

博客來

The establishment, expansion and ecosystem effects of Phragmites australis, an invasive species in coastal Louisiana.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The establishment, expansion and ecosystem effects of Phragmites australis, an invasive species in coastal Louisiana./
作者:	Stanton, Lee Ellis.
面頁冊數:	182 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1267.
Contained By:	Dissertation Abstracts International66-03B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3167162
ISBN:	0542025906

The establishment, expansion and ecosystem effects of Phragmites australis, an invasive species in coastal Louisiana.
Stanton, Lee Ellis.

The establishment, expansion and ecosystem effects of Phragmites australis, an invasive species in coastal Louisiana. - 182 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1267.

Thesis (Ph.D.)--Louisiana State University and Agricultural & Mechanical College, 2005.

As biological invasions have become a common phenomenon throughout the world, ecologists have intensified efforts to understand why natural communities are susceptible to invasion. Invading species can cause shifts in community structure that result in irreversible changes to ecosystem function. Phragmites australis has rapidly spread in North American coastal wetlands during the past 50 years and has become a dominant feature in Northern Gulf of Mexico brackish marshes. The rate at which Phragmites is spreading or the mechanisms controlling its establishment in these marshes is unknown. My research objectives were to: (1) determine the spatial and temporal patterns of Phragmites invasion and expansion; (2) evaluate how disturbance and nutrient enrichment controls brackish marsh invasibility and Phragmites establishment, and (3) identify the ecosystem impacts occurring within a brackish marsh during Phragmites invasion. I found substantial increases in the abundance and size of clones of Phragmites during the past 75 years. Annual increases of 11--23% occurred in area covered by clones, which had intrinsic rates of increase in size of 0.07--0.23 yr-1. To test marsh invasibility, I manipulated both nutrient levels and disturbance regimes in conjunction with purposeful introductions of Phragmites seed and rhizome material. Phragmites demonstrated the potential for active growth and spread when rhizomes were introduced into brackish marsh. To examine the ecosystem impacts of Phragmites invasion, I located three isolated Phragmites invasions and identified four distinct community types along a transect from the center of each invasion to adjacent un-invaded marsh. My results demonstrate for the first time that Phragmites increases marsh surface elevation relative to un-invaded marsh. Phragmites invasion resulted greater aboveground biomass, increased organic matter accumulation and peat development and lower cellulose decomposition rates relative to un-invaded marsh.

ISBN: 0542025906Subjects--Topical Terms:

1017726
Biology, Ecology.

The establishment, expansion and ecosystem effects of Phragmites australis, an invasive species in coastal Louisiana.
LDR:03476nmm 2200301 4500 001 1849869
005 20051203081301.5
008 130614s2005 eng d
020 $a 0542025906
035 $a (UnM)AAI3167162
035 $a AAI3167162
040 $a UnM $c UnM
100 1 $a Stanton, Lee Ellis. $3 1937803
245 1 4 $a The establishment, expansion and ecosystem effects of Phragmites australis, an invasive species in coastal Louisiana.
300 $a 182 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1267.
500 $a Director: Irving A. Mendelssohn.
502 $a Thesis (Ph.D.)--Louisiana State University and Agricultural & Mechanical College, 2005.
520 $a As biological invasions have become a common phenomenon throughout the world, ecologists have intensified efforts to understand why natural communities are susceptible to invasion. Invading species can cause shifts in community structure that result in irreversible changes to ecosystem function. Phragmites australis has rapidly spread in North American coastal wetlands during the past 50 years and has become a dominant feature in Northern Gulf of Mexico brackish marshes. The rate at which Phragmites is spreading or the mechanisms controlling its establishment in these marshes is unknown. My research objectives were to: (1) determine the spatial and temporal patterns of Phragmites invasion and expansion; (2) evaluate how disturbance and nutrient enrichment controls brackish marsh invasibility and Phragmites establishment, and (3) identify the ecosystem impacts occurring within a brackish marsh during Phragmites invasion. I found substantial increases in the abundance and size of clones of Phragmites during the past 75 years. Annual increases of 11--23% occurred in area covered by clones, which had intrinsic rates of increase in size of 0.07--0.23 yr-1. To test marsh invasibility, I manipulated both nutrient levels and disturbance regimes in conjunction with purposeful introductions of Phragmites seed and rhizome material. Phragmites demonstrated the potential for active growth and spread when rhizomes were introduced into brackish marsh. To examine the ecosystem impacts of Phragmites invasion, I located three isolated Phragmites invasions and identified four distinct community types along a transect from the center of each invasion to adjacent un-invaded marsh. My results demonstrate for the first time that Phragmites increases marsh surface elevation relative to un-invaded marsh. Phragmites invasion resulted greater aboveground biomass, increased organic matter accumulation and peat development and lower cellulose decomposition rates relative to un-invaded marsh.
520 $a The numbers and sizes of Phragmites invasions are increasing without apparent restriction in this Louisiana brackish marsh. These communities remain vulnerable to future Phragmites invasions if rhizomes are transported to new locations. Furthermore, Phragmites has an obvious affect as an ecosystem engineer and may allow invaded marshes to better tolerate increasing water levels due to sea-level rise/land subsidence than native short-stature graminoids.
590 $a School code: 0107.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Botany. $3 1017825
650 4 $a Biology, Oceanography. $3 783691
690 $a 0329
690 $a 0309
690 $a 0416
710 2 0 $a Louisiana State University and Agricultural & Mechanical College. $3 783779
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Mendelssohn, Irving A., $e advisor
790 $a 0107
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3167162