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

Dispersal limitations and population...

University of Puerto Rico, Rio Piedras (Puerto Rico).

FindBook

Google Book

Amazon

博客來

Dispersal limitations and population genetic structure of two mangroves in the neotropics.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Dispersal limitations and population genetic structure of two mangroves in the neotropics./
作者:	Ceron Souza, Ivania.
面頁冊數:	160 p.
附註:	Adviser: Owen McMillan.
Contained By:	Dissertation Abstracts International70-02B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3346410
ISBN:	9781109012804

Dispersal limitations and population genetic structure of two mangroves in the neotropics.
Ceron Souza, Ivania.

Dispersal limitations and population genetic structure of two mangroves in the neotropics. - 160 p.

Adviser: Owen McMillan.

Thesis (Ph.D.)--University of Puerto Rico, Rio Piedras (Puerto Rico), 2009.

In this study I focused on mangrove forests as a model system to understand the role of historical and contemporary forces in shaping local and regional patterns of genetic diversity. Mangroves have a very important ecological role in tropical coastal areas; however they are disappearing at an alarming rate. Therefore, a better understanding of historical and contemporary patterns of gene flow is critical for their conservation. Here, I focused on the two most widespread mangrove species in the Neotropics: red mangrove (Rhizophora mangle) and black mangrove (Avicennia germinans) and to address the following questions (1) what is the evolutionary history of the Rhizophora genus in Neotropics? (2) Does R. mangle show evidence of long-distance dispersal across its geographic range of distribution? Is this pattern similar to the pattern previously described for A. germinans? And (3) how do life-history characteristics of A. germinans and R. mangle affect Spatial Genetic Structure (SGS) at local scales? I found the evolutionary history of Rhizophora genus in Neotropics resulted very complex. Genetic data support ancient and ongoing introgressive hybridization between R. mangle and R. racemosa, at both sides of CAI and when these two sister species are in sympatry. Apparently, the final closure of the Central American Isthmus (CAI) represents the most important geologic event in the evolutionary history of Rhizophora because generated strong divergence between Oceans without evidence of secondary gene flow across this barrier. In consequence Caribbean/Atlantic and East Pacific Ocean basins have been evolving independently since the Pliocene. In addition, similar to previously reported in A. germinans, there is long-distance dispersal (LDD) of R. mangle within Oceans. Extreme LDD is occurring between West Africa and South America, across the Atlantic Ocean. Nevertheless, R. mangle populations have strong geographic structure within each Ocean basin indicating that cooling events and sea-level fluctuations in late Tertiary and Quaternary contract and expand populations several times generating strong structure. Finally, I found stronger fine-scale SGS in A. germinans than R. mangle suggesting that pollen and propagule dispersal is more restricted in A. germinans and that recruitment in riverine and fringe forest favor R. mangle over A. germinans.

ISBN: 9781109012804Subjects--Topical Terms:

1017726
Biology, Ecology.

Dispersal limitations and population genetic structure of two mangroves in the neotropics.
LDR:03321nam 2200289 a 45 001 861276
005 20100719
008 100719s2009 ||||||||||||||||| ||eng d
020 $a 9781109012804
035 $a (UMI)AAI3346410
035 $a AAI3346410
040 $a UMI $c UMI
100 1 $a Ceron Souza, Ivania. $3 1028958
245 1 0 $a Dispersal limitations and population genetic structure of two mangroves in the neotropics.
300 $a 160 p.
500 $a Adviser: Owen McMillan.
500 $a Source: Dissertation Abstracts International, Volume: 70-02, Section: B, page: .
502 $a Thesis (Ph.D.)--University of Puerto Rico, Rio Piedras (Puerto Rico), 2009.
520 $a In this study I focused on mangrove forests as a model system to understand the role of historical and contemporary forces in shaping local and regional patterns of genetic diversity. Mangroves have a very important ecological role in tropical coastal areas; however they are disappearing at an alarming rate. Therefore, a better understanding of historical and contemporary patterns of gene flow is critical for their conservation. Here, I focused on the two most widespread mangrove species in the Neotropics: red mangrove (Rhizophora mangle) and black mangrove (Avicennia germinans) and to address the following questions (1) what is the evolutionary history of the Rhizophora genus in Neotropics? (2) Does R. mangle show evidence of long-distance dispersal across its geographic range of distribution? Is this pattern similar to the pattern previously described for A. germinans? And (3) how do life-history characteristics of A. germinans and R. mangle affect Spatial Genetic Structure (SGS) at local scales? I found the evolutionary history of Rhizophora genus in Neotropics resulted very complex. Genetic data support ancient and ongoing introgressive hybridization between R. mangle and R. racemosa, at both sides of CAI and when these two sister species are in sympatry. Apparently, the final closure of the Central American Isthmus (CAI) represents the most important geologic event in the evolutionary history of Rhizophora because generated strong divergence between Oceans without evidence of secondary gene flow across this barrier. In consequence Caribbean/Atlantic and East Pacific Ocean basins have been evolving independently since the Pliocene. In addition, similar to previously reported in A. germinans, there is long-distance dispersal (LDD) of R. mangle within Oceans. Extreme LDD is occurring between West Africa and South America, across the Atlantic Ocean. Nevertheless, R. mangle populations have strong geographic structure within each Ocean basin indicating that cooling events and sea-level fluctuations in late Tertiary and Quaternary contract and expand populations several times generating strong structure. Finally, I found stronger fine-scale SGS in A. germinans than R. mangle suggesting that pollen and propagule dispersal is more restricted in A. germinans and that recruitment in riverine and fringe forest favor R. mangle over A. germinans.
590 $a School code: 0281.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Genetics. $3 1017730
650 4 $a Biology, Molecular. $3 1017719
690 $a 0307
690 $a 0329
690 $a 0369
710 2 $a University of Puerto Rico, Rio Piedras (Puerto Rico). $3 1017828
773 0 $t Dissertation Abstracts International $g 70-02B.
790 $a 0281
790 1 0 $a McMillan, Owen, $e advisor
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3346410