東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Etude du role de la selection nature...

Veliz, David.

Linked to FindBook

Google Book

Amazon

博客來

Etude du role de la selection naturelle et de la dispersion comme determinisme de la structure genetique chez Semibalanus balanoides.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Etude du role de la selection naturelle et de la dispersion comme determinisme de la structure genetique chez Semibalanus balanoides./
Author:	Veliz, David.
Description:	162 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1268.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR00634
ISBN:	049400634X

Etude du role de la selection naturelle et de la dispersion comme determinisme de la structure genetique chez Semibalanus balanoides.
Veliz, David.

Etude du role de la selection naturelle et de la dispersion comme determinisme de la structure genetique chez Semibalanus balanoides. - 162 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1268.

Thesis (Ph.D.)--Universite Laval (Canada), 2005.

Understanding spatial and temporal scales at which evolutionary processes interact is fundamental to know how the species and their populations adapt to the environment. Among these evolutionary processes, selection and dispersal play an important role, due to the speed with which they can change population dynamics and their adaptation to the environment. We examined these two processes in the acorn barnacle Semibalanus balanoides, a model invertebrate intertidal species having to adapt to a highly heterogeneous environment. In this species, a geographic (or spatial) discontinuity in the allelic frequencies of two allozymes (MPI* and GPI*) is maintained under the effect of selection in the south of the gulf of the St. Lawrence, whereas neutrality cannot be ruled out in the north region. Our results showed that the selection occurs during first days after larval settlement. Modeling of the system showed that polymorphism can be maintained when barnacles from the northern region of the Gulf contribute the majority of recruitment of the whole population. The ecological data, in particular the disproportionate movements of the larvae in north-south direction and oceanographic currents in the area, support the prediction of the model. This discovery represents one of the rare studies able to explain the maintenance of genetic variability by natural selection in a heterogeneous environment. Finally, an analysis of microsatellite markers showed that the larvae of S. balanoides do not mix completely during planktonic development, suggesting that barnacles within a microhabitat have similar parental lineages despite the enormous potential for planktonic mixing. Indeed, unidirectional currents in the Gulf of St. Lawrence, high individual fecundity, and gregarious behaviour of the larvae at settlement could influence the non-random distribution of individuals in the intertidal. This study shows for this S. balanoides population that the oceanographic currents play a predominant role in the selection and dispersal dynamics, fundamental processes for the adaptation to highly heterogeneous environments.

ISBN: 049400634XSubjects--Topical Terms:

1017726
Biology, Ecology.

Etude du role de la selection naturelle et de la dispersion comme determinisme de la structure genetique chez Semibalanus balanoides.
LDR:03118nmm 2200301 4500 001 1849874
005 20051203081302.5
008 130614s2005 eng d
020 $a 049400634X
035 $a (UnM)AAINR00634
035 $a AAINR00634
040 $a UnM $c UnM
100 1 $a Veliz, David. $3 1937808
245 1 0 $a Etude du role de la selection naturelle et de la dispersion comme determinisme de la structure genetique chez Semibalanus balanoides.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1268.
500 $a Adviser: Louis Bernatchez.
502 $a Thesis (Ph.D.)--Universite Laval (Canada), 2005.
520 $a Understanding spatial and temporal scales at which evolutionary processes interact is fundamental to know how the species and their populations adapt to the environment. Among these evolutionary processes, selection and dispersal play an important role, due to the speed with which they can change population dynamics and their adaptation to the environment. We examined these two processes in the acorn barnacle Semibalanus balanoides, a model invertebrate intertidal species having to adapt to a highly heterogeneous environment. In this species, a geographic (or spatial) discontinuity in the allelic frequencies of two allozymes (MPI* and GPI*) is maintained under the effect of selection in the south of the gulf of the St. Lawrence, whereas neutrality cannot be ruled out in the north region. Our results showed that the selection occurs during first days after larval settlement. Modeling of the system showed that polymorphism can be maintained when barnacles from the northern region of the Gulf contribute the majority of recruitment of the whole population. The ecological data, in particular the disproportionate movements of the larvae in north-south direction and oceanographic currents in the area, support the prediction of the model. This discovery represents one of the rare studies able to explain the maintenance of genetic variability by natural selection in a heterogeneous environment. Finally, an analysis of microsatellite markers showed that the larvae of S. balanoides do not mix completely during planktonic development, suggesting that barnacles within a microhabitat have similar parental lineages despite the enormous potential for planktonic mixing. Indeed, unidirectional currents in the Gulf of St. Lawrence, high individual fecundity, and gregarious behaviour of the larvae at settlement could influence the non-random distribution of individuals in the intertidal. This study shows for this S. balanoides population that the oceanographic currents play a predominant role in the selection and dispersal dynamics, fundamental processes for the adaptation to highly heterogeneous environments.
590 $a School code: 0726.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Genetics. $3 1017730
650 4 $a Biology, Oceanography. $3 783691
650 4 $a Biology, Zoology. $3 1018632
690 $a 0329
690 $a 0369
690 $a 0416
690 $a 0472
710 2 0 $a Universite Laval (Canada). $3 1020170
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Bernatchez, Louis, $e advisor
790 $a 0726
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR00634