High connectivity across the fragmented chemosynthetic ecosystems of the deep Atlantic Equatorial Belt: efficient dispersal mechanisms or questionable endemism?

Type Article
Date 2013-09
Language English
Author(s) Teixeira Sara1, 2, Olu KarineORCID1, Decker Carole1, Cunha Regina L.2, Fuchs Sandra1, Hourdez Stephane3, Serrao Ester A.2, Arnaud-Haond SophieORCID1
Affiliation(s) 1 : IFREMER, Lab Environm Profond EEP LEP, CS10070, F-2980 Plouzane, France.
2 : Univ Algarve, Ctr Marine Sci, CIMAR, P-8005139 Faro, Portugal.
3 : Equipe Ecophysiol Adaptat & Evolut Mol, Stn Biol Roscoff, F-29680 Roscoff, France.
Source Molecular Ecology (0962-1083) (Wiley-blackwell), 2013-09 , Vol. 22 , N. 18 , P. 4663-4680
DOI 10.1111/mec.12419
WOS© Times Cited 33
Keyword(s) Atlantic equatorial belt, chemosynthetic habitats, deep-sea connectivity, endemic bivalves, endemic shrimp, genetic diversity, microsatellite markers, mitochondrial COI gene
Abstract Chemosynthetic ecosystems are distributed worldwide in fragmented habitats harbouring seemingly highly specialized communities. Yet, shared taxa have been reported from highly distant chemosynthetic communities. These habitats are distributed in distinct biogeographical regions, one of these being the so-called Atlantic Equatorial Belt (AEB). Here, we combined genetic data (COI) from several taxa to assess the possible existence of cryptic or synonymous species and to detect the possible occurrence of contemporary gene flow among populations of chemosynthetic species located on both sides of the Atlantic. Several Evolutionary Significant Units (ESUs) of Alvinocarididae shrimp and Vesicomyidae bivalves were found to be shared across seeps of the AEB. Some were also common to hydrothermal vent communities of the Mid-Atlantic Ridge (MAR), encompassing taxa morphologically described as distinct species or even genera. The hypothesis of current or very recent large-scale gene flow among seeps and vents was supported by microsatellite analysis of the shrimp species Alvinocaris muricola/Alvinocaris markensis across the AEB and MAR. Two nonmutually exclusive hypotheses may explain these findings. The dispersion of larvae or adults following strong deep-sea currents, possibly combined with biochemical cues influencing the duration of larval development and timing of metamorphosis, may result in large-scale effective migration among distant spots scattered on the oceanic seafloor. Alternatively, these results may arise from the prevailing lack of knowledge on the ocean seabed, apart from emblematic ecosystems (chemosynthetic ecosystems, coral reefs or seamounts), where the widespread classification of endemism associated with many chemosynthetic taxa might hide wider distributions in overlooked parts of the deep sea.
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Teixeira Sara, Olu Karine, Decker Carole, Cunha Regina L., Fuchs Sandra, Hourdez Stephane, Serrao Ester A., Arnaud-Haond Sophie (2013). High connectivity across the fragmented chemosynthetic ecosystems of the deep Atlantic Equatorial Belt: efficient dispersal mechanisms or questionable endemism? Molecular Ecology, 22(18), 4663-4680. Publisher's official version : https://doi.org/10.1111/mec.12419 , Open Access version : https://archimer.ifremer.fr/doc/00157/26789/