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

Phenotypic and genetic variability i...

Prada Montoya, Carlos Andres.

Linked to FindBook

Google Book

Amazon

博客來

Phenotypic and genetic variability in the octocoral Plexaura flexuosa.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Phenotypic and genetic variability in the octocoral Plexaura flexuosa./
Author:	Prada Montoya, Carlos Andres.
Description:	75 p.
Notes:	Adviser: Paul Yoshioka.
Contained By:	Masters Abstracts International46-04.
Subject:	Biology, Oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1451292
ISBN:	9780549403562

Phenotypic and genetic variability in the octocoral Plexaura flexuosa.
Prada Montoya, Carlos Andres.

Phenotypic and genetic variability in the octocoral Plexaura flexuosa. - 75 p.

Adviser: Paul Yoshioka.

Thesis (M.S.)--University of Puerto Rico, Mayaguez (Puerto Rico), 2008.

Clonal marine organisms exhibit high levels of morphological variation. Morphological variation may be a response to environmental factors but also they can be attributed to genetic factors. In this study, we examined the extensive morphological variation observed in the gorgonian Plexaura flexuosa (Lamouroux, 1821), a widely distributed Caribbean octocoral. We quantified differences in morphological traits in natural populations along depth profiles (shallow <5 m and deep >17 m), degree of protection to water motion and sedimentation rates (from inshore, protected and high sedimentation rates to offshore, exposed and lower sediment loads). Also, transplant experiments and genetic analysis were performed to test for possible ecophenotypic and genetic interactions. Significant differences (P<0.001) in 14 morphological traits were found among colonies inhabiting 12 locations comprising seven reefs in southwest Puerto Rico. Results from principal component analysis indicated the presence of two groups based on depth distribution, suggesting the presence of two discrete morphotypes (i.e. shallow type <5 m and deep type >17 m). A discriminant function analysis based on a priori univariate and multivariate analyses (which separated the colonies in morphotypes) correctly classified 93% of the colonies for each environment. Light, water motion and sediment transport co-varied along the depth profiles and they might influence the distribution of the two morphotypes. However, the study was not designed to separate the contribution of each variable. Reaction norms of morphological characters of colonies that were reciprocally transplanted showed gradual significant changes through the 15 months of transplantation. Sclerites of shallow water colonies became larger when transplanted to deeper environments and vice versa, but, neither of the two transplanted groups overlapped with the residents' morphology. Genetic analysis of mitochondrial and nuclear genes suggested that such discrete morphology and non-overlapping phenotypic plasticity is correlated with the presence of two independent evolutionary lineages distributed non-randomly in shallow and deep environments. The genetic patterns found in the two sympatrically living morphs may have resulted from (1) secondary contact after populations diverged in allopatry and reproductive isolation machinery developed, (2) by divergence with gene flow through ecological specialization in sympatry or (3) by the poorly understood process of hybridization in anthozoan evolution.

ISBN: 9780549403562Subjects--Topical Terms:

783691
Biology, Oceanography.

Phenotypic and genetic variability in the octocoral Plexaura flexuosa.
LDR:03411nam 2200265 a 45 001 962326
005 20110830
008 110831s2008 ||||||||||||||||| ||eng d
020 $a 9780549403562
035 $a (UMI)AAI1451292
035 $a AAI1451292
040 $a UMI $c UMI
100 1 $a Prada Montoya, Carlos Andres. $3 1285373
245 1 0 $a Phenotypic and genetic variability in the octocoral Plexaura flexuosa.
300 $a 75 p.
500 $a Adviser: Paul Yoshioka.
500 $a Source: Masters Abstracts International, Volume: 46-04, page: 2001.
502 $a Thesis (M.S.)--University of Puerto Rico, Mayaguez (Puerto Rico), 2008.
520 $a Clonal marine organisms exhibit high levels of morphological variation. Morphological variation may be a response to environmental factors but also they can be attributed to genetic factors. In this study, we examined the extensive morphological variation observed in the gorgonian Plexaura flexuosa (Lamouroux, 1821), a widely distributed Caribbean octocoral. We quantified differences in morphological traits in natural populations along depth profiles (shallow <5 m and deep >17 m), degree of protection to water motion and sedimentation rates (from inshore, protected and high sedimentation rates to offshore, exposed and lower sediment loads). Also, transplant experiments and genetic analysis were performed to test for possible ecophenotypic and genetic interactions. Significant differences (P<0.001) in 14 morphological traits were found among colonies inhabiting 12 locations comprising seven reefs in southwest Puerto Rico. Results from principal component analysis indicated the presence of two groups based on depth distribution, suggesting the presence of two discrete morphotypes (i.e. shallow type <5 m and deep type >17 m). A discriminant function analysis based on a priori univariate and multivariate analyses (which separated the colonies in morphotypes) correctly classified 93% of the colonies for each environment. Light, water motion and sediment transport co-varied along the depth profiles and they might influence the distribution of the two morphotypes. However, the study was not designed to separate the contribution of each variable. Reaction norms of morphological characters of colonies that were reciprocally transplanted showed gradual significant changes through the 15 months of transplantation. Sclerites of shallow water colonies became larger when transplanted to deeper environments and vice versa, but, neither of the two transplanted groups overlapped with the residents' morphology. Genetic analysis of mitochondrial and nuclear genes suggested that such discrete morphology and non-overlapping phenotypic plasticity is correlated with the presence of two independent evolutionary lineages distributed non-randomly in shallow and deep environments. The genetic patterns found in the two sympatrically living morphs may have resulted from (1) secondary contact after populations diverged in allopatry and reproductive isolation machinery developed, (2) by divergence with gene flow through ecological specialization in sympatry or (3) by the poorly understood process of hybridization in anthozoan evolution.
590 $a School code: 0553.
650 4 $a Biology, Oceanography. $3 783691
690 $a 0416
710 2 $a University of Puerto Rico, Mayaguez (Puerto Rico). $3 1017811
773 0 $t Masters Abstracts International $g 46-04.
790 $a 0553
790 1 0 $a Yoshioka, Paul, $e advisor
791 $a M.S.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1451292