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Are free-floating planktonic hydroids (Cnidaria, Hydrozoa) common components of the pelagic fauna from the South Brazilian Bight?
Cabral, A.C.; Noguiera Junior, M.; Nagata, R.M.; Pereira Brandini, F. (2015). Are free-floating planktonic hydroids (Cnidaria, Hydrozoa) common components of the pelagic fauna from the South Brazilian Bight?, in: Sukhotin, A. et al. (Ed.) Proceedings of the 49th European Marine Biology Symposium September 8-12, 2014, St. Petersburg, Russia. Journal of the Marine Biological Association of the United Kingdom, 95(8): pp. 1645-1652. hdl.handle.net/10.1017/S0025315415000727
In: Sukhotin, A. et al. (Ed.) (2015). Proceedings of the 49th European Marine Biology Symposium September 8-12, 2014, St. Petersburg, Russia. Journal of the Marine Biological Association of the United Kingdom, 95(8). Cambridge University Press: Cambridge. 1517-1721 pp., more
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Peer reviewed article  

Available in Authors 
Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Cabral, A.C.
  • Noguiera Junior, M.
  • Nagata, R.M.
  • Pereira Brandini, F.

Abstract
    We analysed 267 zooplankton samples collected in the South Brazilian Bight (SBB; 23–27°S) to determine whether hydroids, typically benthic, are common components of the pelagic SBB. Two species, Clytia arborescens, recorded for the first time in the Atlantic Ocean, and Clytia sp. were identified. While these planktonic hydroids were frequent or relatively so in shallow shelf waters (~23% of the samples <50 m isobaths, and 5% of the samples >100 m), abundances were low (up to 61 hydranths m-3) suggesting a low trophic impact. Such colonies are probably fragments of benthic colonies detached by storms and/or tides. Given the good condition of the coenosarc, existence of gastric content, and presence of reproductive structures, development of these species appears to be normal in the pelagic environment. Existence in the plankton may increase their capacity for dispersion.

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