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Filling biodiversity gaps: benthic hydroids from the Bellingshausen Sea (Antarctica)

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Abstract

The Bellingshausen Sea constitutes the third largest sea in the Southern Ocean, though it is widely recognized as one of the less-studied Antarctic areas. To reduce this lack of knowledge, a survey to study the biodiversity of its marine benthic communities was carried out during the Bentart 2003 and Bentart 2006 Spanish Antarctic expeditions. The study of the hydroid collection has provided 27 species, belonging to ten families and 15 genera. Twenty-one out of the 27 species constitute new records for the Bellingshausen Sea, raising the total number of known species to 37, as also do nine out of the 15 genera. Candelabrum penola, Lafoea annulata, and Staurotheca juncea are recorded for the second time. Most species belong to Leptothecata. Sertulariidae with 13 species (48%) is by far the most speciose family, and Symplectoscyphus with seven species (26%), including S. bellingshauseni sp. nov. and S. hesperides sp. nov., the most diverse genus. Considering the whole benthic hydroid fauna of the Bellingshausen Sea, 18 species (69%) are endemic to Antarctic waters, either with a circum-Antarctic (12 species, 46%) or West Antarctic (6 species, 23%) distribution, 23 (88%) are restricted to Antarctic or Antarctic/sub-Antarctic waters, and only three species have a wider distribution. Bellingshausen Sea hydroid fauna is composed of a relatively high diversity of typical representatives of the Antarctic benthic hydroid fauna, though with a surprisingly low representation of some of the most diverse and widespread Antarctic genera (Oswaldella and Schizotricha), what could be related to the fact that its shelf-inhabiting hydroid fauna remains practically unknown.

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Acknowledgments

I wish to thank Dr. José Luis Sanz Alonso from the Instituto Español de Oceanografía for his help in the elaboration of Fig. 1. Bentart 2003 and Bentart 2006 campaigns were funded, respectively, by the Ministerio de Educación y Ciencia (Ref. REN2001-1074/ANT) and the Ministerio de Ciencia y Tecnología (Ref. CG/2004-01856) of Spain. This study was developed thanks to a research project (Ref. CTM2009-11128ANT) funded by the Ministerio de Ciencia e Innovación of Spain and the Fondo Europeo de Desarrollo Regional (FEDER).

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  1. Instituto Cavanilles de Biodiversidad y Biología Evolutiva (ICBiBE), Universidad de Valencia, Apdo. Correos 22085, 46071, Valencia, Spain

    Álvaro Luis Peña Cantero

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Peña Cantero, Á.L. Filling biodiversity gaps: benthic hydroids from the Bellingshausen Sea (Antarctica). Polar Biol 35, 851–865 (2012). https://doi.org/10.1007/s00300-011-1130-y

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  • DOI: https://doi.org/10.1007/s00300-011-1130-y

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