2024-03-29T15:54:06Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1704222022-05-30T06:41:02Zcom_10261_88com_10261_8col_10261_341
DIGITAL.CSIC
author
Sitjà, Cèlia
author
Maldonado, Manuel
author
Farias, Carlos
author
Rueda, Jose L.
2018-10-02T06:32:54Z
2018-10-02T06:32:54Z
2018
Journal of the Marine Biological Association of the United Kingdom : doi:10.1017/S0025315418000589 (2018)
0025-3154
http://hdl.handle.net/10261/170422
1469-7769
Mud volcanoes are singular seafloor structures classified as ‘sensitive habitats’. Here we report
on the sponge fauna from a field of eight mud volcanoes located in the Spanish margin of the
northern Gulf of Cadiz (North-eastern Atlantic), at depths ranging from 380 to 1146 m.
Thirty-eight beam-trawl samplings were conducted (covering over 61,000 m2) from 2010 to
2012, in the frame of a EC-LIFE + INDEMARES grant. A total of 1659 specimens were
retrieved, belonging to 82 species, from which 79 were in the Class Demospongiae and
three in Hexactinellida. Two species were new to science (Jaspis sinuoxea sp. nov.;
Myrmekioderma indemaresi sp. nov.) and three others recorded for the first time in the
Atlantic Ocean (Geodia anceps, Coelosphaera cryosi and Petrosia raphida). Five additional species
were ‘Atlantic oddities’, since this study provides their second record in the Atlantic
Ocean (Lanuginella cf. pupa, Geodia cf. spherastrella, Cladocroce spathiformis, Cladocroce
fibrosa and Haliclona pedunculata). Basic numerical analyses indicated a significant linear
relationship between the species richness per m2 and the number of sponge individuals per
m2, meaning that in most volcanoes many species occur in equivalent, moderate abundance.
Likewise, sponge species richness increased with depth, while the abundance of hard substrata
resulting from carbonate precipitation and the fishing activities around the volcanoes had no
detectable effect on the sponge fauna. However, in the latter case, a negative trend – lacking
statistical support – underlaid the analyses, suggesting that a more extensive sampling would
be necessary to derive more definitive conclusions in this regard.
eng
openAccess
Porifera
Sponge aggregations
Bathyal benthos
Continental slope
Deep-sea biodiversity
Environmental conservation
Methane seeps
Deep-water sponge fauna from the mud volcanoes of the Gulf of Cadiz (North Atlantic, Spain)
artículo
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URL
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2258057
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Sitjà 2018.pdf