Deli, Temim and Chatti, Noureddine and Said, Khaled and Gonzalez-Ortegon, Enrique and Schubart, Christoph D. (2025) Population genetic polymorphism and structure in the two coastal crab species Carcinus aestuarii (Brachyura, Carcinidae) and Pachygrapsus marmoratus (Brachyura, Grapsidae), across the Mediterranean Sea, reflect residual effects of different evolutionary histories. ACTA OCEANOLOGICA SINICA, 44 (7). pp. 88-107. ISSN 0253-505X, 1869-1099
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The present investigation aims at unveiling the main causes of the recorded disparate phylogeographic patterning among the two highly dispersive coastal crab species Carcinus aestuarii and Pachygrapsus marmoratus in the Mediterranean Sea. For this purpose, available mitochondrial and nuclear data for both species were re-analyzed and investigated for genetic polymorphism and differentiation patterns across three defined geographic scales in their distribution ranges, but also across the same locations in the Mediterranean Sea. The temporal frame of genetic diversification was also determined for both species in order to check whether observed differences in phylogeographic patterns among these coastal decapods could be attributed to different evolutionary histories. The obtained results revealed a more variable and diversified gene pool in the green crab C. aestuarii than the one recorded in the marbled crab P. marmoratus. Lack of significant correlation between pairwise genetic dissimilarities observed among C. aestuarii populations and those detected for P. marmoratus was notably discerned across the same defined Mediterranean locations. This finding indicates that the pattern of pairwise genetic differentiation does not vary in the same way in both examined crab species. Significant outputs of population genetic differentiation, retrieved within both species, were shown to be differently associated with the potential effects of various kinds of isolation processes (related to geography, environment and biogeographic boundary). Evolutionary history reconstruction showed older genetic diversification event in C. aestuarii than the one recorded in P. marmoratus. These recorded temporal frames suggest different modes of genetic diversification in both crab species (glacial vicariance for C. aestuarii and interglacial dispersal for P. marmoratus). They may also provide an explanation for the recorded differences in variation of patterns of population genetic diversity and structure, when integrated with species ecological requirements and life-history traits.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SHORE CRAB; GREEN CRAB; MITOCHONDRIAL-DNA; DISPERSAL; TRANSITION; PATTERNS; WESTERN; PHYLOGEOGRAPHY; SPECIATION; DIVERSITY; crustaceans; Mediterranean Sea; Cox1 gene; nuclear microsatellite loci; genetic diversity and structure; evolutionary history |
| Subjects: | 500 Science > 570 Life sciences 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Apr 2026 04:29 |
| Last Modified: | 15 Apr 2026 04:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67396 |
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