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Van Gaever, S.; Moodley, L.; De Beer, D.; Vanreusel, A. (2006). Meiobenthos at the Arctic Håkon Mosby Mud Volcano, with a parental-caring nematode thriving in sulphide-rich sediments. Marine Ecology Progress Series. 321: 143-155.
181419
10.3354/meps321143 [view]
Van Gaever, S.; Moodley, L.; De Beer, D.; Vanreusel, A.
2006
Meiobenthos at the Arctic Håkon Mosby Mud Volcano, with a parental-caring nematode thriving in sulphide-rich sediments
Marine Ecology Progress Series
321: 143-155
Publication
NeMys doc_id: 18010
Available for editors  PDF available
Håkon Mosby Mud Volcano (HMMV, SW Barents Sea slope, 1280 m) is one of the numerous cold methane-venting seeps existing along the continental margins. Analyses of videoguided core samples revealed extreme differences in the diversity and density of the metazoan meiobenthic communities associated with the different sub-habitats (centre, microbial mats, Pogonophora field, outer rim) of this mud volcano. Diversity was lowest in the sulphidic, microbial mat sediments that supported the highest standing stock, with unusually high densities (11 000 ind. 10 cm–2) of 1 nematode species related to Geomonhystera disjuncta. Stable carbon isotope analyses revealed that this nematode species was thriving on chemosynthetically derived food sources in these sediments. Ovoviviparous reproduction has been identified as an important adaptation of parents securing the survival and development of their brood in this toxic environment. The proliferation of this single species in exclusive association with free-living, sulphide-oxidising bacteria (Beggiatoa) indicates that its dominance is strongly related to trophic specialisation, evidently uncommon among the meiofauna. This chemoautotrophic association was replaced by copepods in the bare, sulphidefree sediments of the volcano’s centre, dominated by aerobic methane oxidation as the chemosynthetic process. Copepods and nauplii reached maximum densities and dominance in the volcano’s centre (500 ind. 10 cm–2). Their strongly depleted carbon isotope signatures indicated a trophic link with methane-derived carbon. This proliferation of only selected meiobenthic species supported by chemosynthetically derived carbon suggests that, in addition to the sediment geochemistry, the associated reduced meiobenthic diversity may equally be related to the trophic resource specificity in HMMV sub-habitats.
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2014-06-18 16:05:08Z
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Chromadorita Filipjev, 1922 (additional source)
Daptonema Cobb, 1920 (additional source)
Halalaimus de Man, 1888 (additional source)
Halomonhystera disjuncta (Bastian, 1865) Andrassy, 2006 (additional source)
Metalinhomoeus de Man, 1907 (additional source)
Microlaimus de Man, 1880 (additional source)
Molgolaimus Ditlevsen, 1921 (additional source)
Monhystera Bastian, 1865 (additional source)
Sabatieria Rouville, 1903 (additional source)
Theristus Bastian, 1865 (additional source)
Tricoma Cobb, 1894 (additional source)

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