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| 1 | Patterns of genetic and morphometric diversity in the marbled crab(Pachygrapsus marmoratus, Brachyura, Grapsidae)populations across the Tunisian coast显示文摘The present study reports on population structure analysis of the marbled crab Pachygrapsus marmoratus(Fabricius, 1787) from the Tunisian coast, an appropriate location to study biogeographical processes because of the presence of a well-known discontinuous biogeographic area(the Siculo-Tunisian Strait). Patterns of morphological and genetic variation of this highly dispersive and continuously distributed decapod species were assessed among its geographically close populations which cover almost the entire Tunisian coastline. A total of386 specimens from nine sites were collected and examined for morphometric variability at 14 morphometric traits. The results of multivariate analyses of linear morphometric traits showed the existence of sexual dimorphism in this species by PERMANOVA(Permutational multivariate analysis of variance). In addition, both CDA(Canonical discriminant analysis) and NPMANOVA(Non parametric MANOVA test) analyses revealed statistically significant differences among the studied locations for both sexes. Overall, the outcome of CDA analysis showed that over 87% of individuals could be assigned correctly to three regional groups in both sexes(North, Center and South). Specifically, SIMPER(Similarity Percentages) analysis showed that carapace length,carapace width and merus length were major contributors to the morphometric separation between populations.The pattern of phenotypic variation suggested by morphometric analyses was found to be highly discordant with that suggested by the analysis of a mitochondrial marker(cytochrome oxidase I, COI). Indeed, the results inferred from restriction fragment analysis of the COI in 180 crabs, suggested high genetic homogeneity. Very low levels of haplotype diversity(h) were found in almost all the studied populations, associated with non significant genetic distances for nearly all population comparisons. Explanations to these morphometric and mt DNA patterns as well as the discrepancy between them are discussed. | Temim Deli Hiba Bahles Khaled Said Noureddine Chatti | 2015 | Acta Oceanologica Sinica2015，34，6： | 1 |
| 2 | Genetic and morphological divergence in the purple sea urchin Paracentrotus lividus(Echinodermata,Echinoidea)across the African Mediterranean coast显示文摘The present investigation focuses on population structure analysis of the purple sea urchin Paracentrotus lividus across the African Mediterranean coast, with the main aim of assessing the influence of the Siculo-Tunisian Strait on gene flow disruption in this highly dispersive echinoid species. For this purpose, patterns of morphological and genetic variation were assessed among its populations from the western and eastern Mediterranean coasts. A total of 302 specimens from seven Tunisian sites were collected and examined for morphometric variability at twelve morphometric traits. Concordant results, inferred from CDA(canonical discriminant analyses), pairwise NPMANOVA(non parametric multivariate analysis of variance) comparisons and MDS(multidimensional scaling) plot, unveiled significant inter-population differences in the measured traits among the studied populations. Furthermore, the combined use of the one way ANOSIM(analysis of similarities) and the Discriminant/Hotelling analysis allowed unravelling two morphologically differentiated groups assigned to both western and eastern Mediterranean basins. The SIMPER(similarity percentages) routine analysis showed that total dry weight, test diameter and spine length were major contributors to the morphometric separation between locations and between groups. Pattern of phenotypic divergence discerned in P. lividus across the Siculo-Tunisian Strait is interestingly in congruence with that inferred from the genetic investigation of the purple sea urchin populations from the same region based on the analysis of the mt DNA COI(cytochrome oxidase I) gene in 314 specimens from nineteen locations covering a wider geographic transect, streching westward to the Algerian coast and eastward to the Libyan littoral. The specific haplotypic composition characterizing each Mediterranean basin,as inferred from the minimum spanning network, confirmed the geographic partioning of genetic variation, as revealed by F-statistics and AMOVA(analysis of molecular variance) analyses, yielding significant genetic differentiation between eastern and western Mediterranean populations. The newly detected phylogeographic patterns, observed for the first time in P. lividus throughout the explored distribution range, suggest the involvement of different biotic and abiotic processes in shaping such variation, and provide evidence that a large and geographically exhaustive dataset is necessary to unveil phylogeographic structure within widespread marine species, previously cathegorized as panmictic in part of their distribution range. | Temim Deli Mohamed Hbib Ben Attia Rym Zitari-Chatti Khaled Said Noureddine Chatti | 2017 | Acta Oceanologica Sinica2017，36，12： | 1 |
| 3 | Lack of mitochondrial genetic structure in the endangered giant clam populations of Tridacna maxima(Bivalvia: Cardiidae:Tridacninae) across the Saudi Arabian coast显示文摘The present investigation focuses on population genetic structure analysis of the endangered giant clam species Tridacna maxima across part of the Red Sea,with the main aim of assessing the influence of postulated potential barriers to gene flow(i.e.,particular oceanographic features and marked environmental heterogeneity)on genetic connectivity among populations of this poorly dispersive bivalve species.For this purpose,a total of 44 specimens of T.maxima were collected from five sampling locations along the Saudi Arabian coast and examined for genetic variability at the considerably variable mitochondrial gene cytochrome c oxidase I(COI).Our results revealed lack of population subdivision and phylogeographic structure across the surveyed geographic spectrum,suggesting that neither the short pelagic larval dispersal nor the various postulated barriers to gene flow in the Red Sea can trigger the onset of marked genetic differentiation in T.maxima.Furthermore,the discerned shallow COI haplotype genealogy(exhibiting high haplotype diversity and low nucleotide diversity),associated with recent demographic and spatial expansion events,can be considered as residual effect of a recent evolutionary history of the species in the Red Sea. | Abdelwaheb Ben Othmen Mohamed Abhary Temim Deli Zouhour Ouanes Noura Alhuwaiti Najet Dimassi Lamjed Mansour | 2020 | Acta Oceanologica Sinica2020，39，2： | 0 |
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