title: Demographic History and Reproductive Output Correlates with Intraspecific Genetic Variation in Seven Species of Indo-Pacific Mangrove Crabs.
abstract: The spatial distribution and the amount of intraspecific genetic variation of marine organisms are strongly influenced by many biotic and abiotic factors. Comparing biological and genetic data characterizing species living in the same habitat can help to elucidate the processes driving these variation patterns. Here, we present a comparative multispecies population genetic study on seven mangrove crabs co-occurring in the West Indian Ocean characterized by planktotrophic larvae with similar pelagic larval duration. Our main aim was to investigate whether a suite of biological, behavioural and ecological traits could affect genetic diversities of the study species in combination with historical demographic parameters. As possible current explanatory factors, we used the intertidal micro-habitat colonised by adult populations, various parameters of individual and population fecundity, and the timing of larval release. As the genetic marker, we used partial sequences of cytochrome oxidase subunit I gene. Genetic and ecological data were collected by the authors and/or gathered from primary literature. Permutational multiple regression models and ANOVA tests showed that species density and their reproductive output in combination with historical demographic parameters could explain the intraspecific genetic variation indexes across the seven species. In particular, species producing consistently less eggs per spawning event showed higher values of haplotype diversity. Moreover, Tajima's D parameters well explained the recorded values for haplotype diversity and average γst. We concluded that current intraspecific gene diversities in crabs inhabiting mangrove forests were affected by population fecundity as well as past demographic history. The results were also discussed in terms of management and conservation of fauna in the Western Indian Ocean mangroves.
authors.affiliation: Department of Biology, University of Florence, Firenze, Italy.
authors.forename: Sara
authors.initials: S
authors.lastname: Fratini
authors.affiliation: Institute for Zoology, Functional Peptidomics, University of Cologne, Cologne, Germany.
authors.forename: Lapo
authors.initials: L
authors.lastname: Ragionieri
authors.affiliation: Department of Biology, University of Florence, Firenze, Italy.|The Swire Institute of Marine Science and the School of Biological Sciences, The University of Hong Kong, Hong Kong, Hong Kong SAR.
authors.forename: Stefano
authors.initials: S
authors.lastname: Cannicci
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D060829:Arthropod Proteins / Q000235:genetics; D003386:Brachyura / Q000145:classification / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000737:chemistry / Q000235:genetics*; D003576:Electron Transport Complex IV / Q000235:genetics; D005260:Female; D014644:Genetic Variation; D005828:Genetics, Population; D005843:Geography; D006239:Haplotypes; D019156:Indian Ocean; D016014:Linear Models; D008297:Male; D010140:Pacific Ocean; D010802:Phylogeny; D011156:Population Density; D012098:Reproduction / Q000235:genetics; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D053833:Wetlands
chemical_list: D060829:Arthropod Proteins; D004272:DNA, Mitochondrial; D003576:Electron Transport Complex IV