Lack of population structure in the fiddler crab Uca annulipes along an East African latitudinal gradient: genetic and morphometric evidence |
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Authors: | Inês C Silva Natacha Mesquita José Paula |
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Institution: | 1. Centro de Oceanografia, Laboratório Marítimo da Guia, Faculdade de Ciências da, Universidade de Lisboa, Avenida Nossa Senhora do Cabo 939, 2750-374, Cascais, Portugal 2. Museu Nacional de História Natural, Universidade de Lisboa, Rua da Escola Politécnica 58, 1269-102, Lisbon, Portugal 3. Centro de Biologia Ambiental, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal
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Abstract: | Phylogeographic patterns in Uca annulipes sampled from 30 locations across an East African latitudinal gradient were investigated using mitochondrial DNA cytochrome
oxidase I sequences and analysed together with patterns of morphometric differentiation. Four hundred and four specimens along
the east African coast were sampled, and 18 haplotypes were encountered. Haplotype and nucleotide diversity values were very
low and the phylogenetic analysis did not reveal any clear phylogeographic structure. Furthermore, the analysis of molecular
variance and pairwise Φ
ST values showed no significant spatial population differentiation. Mismatch analyses and tests of neutrality supported the
hypothesis that this species has undergone a fairly recent demographic expansion. Our results, therefore, failed to demonstrate
significant geographical structure in the pattern of genetic variation, indicating that populations of U. annulipes are capable of extensive gene flow among mangroves along the coast. The genetic structure of this species could be panmictic
due to a high amount of gene flow along the geographical gradient in study during the planktonic larval phase, when larvae
are carried along stream by the dominant currents. Moreover, the morphometric analysis performed did not reveal differences
of shape differentiation according to a geographical pattern, although significant differences among the sampling areas were
found. |
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Keywords: | |
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