Unexpected relationship between dispersal strategies and speciation within the association Bathymodiolus (Bivalvia) - Branchipolynoe (Polychaeta) inferred from the rDNA neutral ITS2 marker
Jollivet, D.; Comtet, T.; Chevaldonné, P.; Hourdez, S.; Desbruyères, D.; Dixon, D.R. (1998). Unexpected relationship between dispersal strategies and speciation within the association Bathymodiolus (Bivalvia) - Branchipolynoe (Polychaeta) inferred from the rDNA neutral ITS2 marker. Cah. Biol. Mar. 39(3-4): 359-362. https://dx.doi.org/10.21411/CBM.A.6BB61284
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, meer
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(1998). Proceedings of the First International Symposium on Deep-Sea Hydrothermal Vent Biology: Funchal, Madeira, Portugal 20-24 October 1997. Cahiers de Biologie Marine, 39(3-4). Station Biologique de Roscoff: Roscoff. 219-392 pp., meer
A significant number of marine invertebrate species inhabiting the deep-sea hydrothermal vent environment produce planktonic larvae with varying life-spans in the water column. An obvious benefit derived from long-term dispersal abilities is that species may colonize new areas over a wide geographical range, and therefore maintain gene flow between their fragmented populations. Deep-sea hydrothermal-vent mytilid bivalves and their commensal polychaetes Branchipolynoe form large associations in many venting areas occurring along ridges of the eastern and western Pacific and the Atlantic. Hydrothermal-vent mytilids produce numerous pelagic larvae which can be carried away by water currents over great distances (Lutz, 1988). Such dispersal abilities should favour a low genetic variation between populations over a wide range of geographical distances and a low number of distinct allopatric species. However, allozymes indicated the existence of cryptic species in the Atlantic but no genetic differentiation between populations of the eastern Pacific species, Bathymodiolus thermophilus (Craddock et al., 1995a, 1995b). Similarly, morphological studies allowed the description of numerous Bathymodiolus species in the western Pacific back-arc basins and along the mid-Atlantic Ridge (Cosel et al., 1994; Cosel et al., in press).
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