Are free-floating planktonic hydroids (Cnidaria, Hydrozoa) common components of the pelagic fauna from the South Brazilian Bight?

Autor(es)

Cabral, Ana Caroline ^[1] ; Nogueira Junior, Miodeli ^[2] ; Nagata, Renato Mitsuo ^[3] ; Brandini, Frederico Pereira ^[4]

Afiliação do(s) autor(es)

^[1] Univ Fed Parana, Ctr Estudos Mar, Programa Posgrad Sistemas Costeiros & Ocean, BR-83255976 Pontal Do Parana, PR - Brazil

^[2] Univ Fed Paraiba, Dept Sistemat & Ecol, BR-58051900 Joao Pessoa, Paraiba - Brazil

^[3] Univ Sao Paulo, Inst Biociencias, Dept Zool, BR-05508090 Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Inst Oceanog, BR-05508120 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Marine Biological Association of the United Kingdom; v. 95, n. 8, p. 1645-1652, DEC 2015.
• Citações Web of Science: 1

Resumo

We analysed 267 zooplankton samples collected in the South Brazilian Bight (SBB; 23-27 degrees 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 (similar to 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. (AU)

• Processo FAPESP: 11/21290-1 - Flutuações inter-decadais (1969-2003) na estrutura e abundância do zooplâncton gelatinoso (Cnidaria e Thaliacea) na Plataforma Continental Sudeste do Brasil
• Beneficiário: Frederico Pereira Brandini
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/09880-8 - Flutuações inter-decadais (1969-2003) na estrutura e abundância do zooplâncton gelatinoso (Cnidaria e Thaliacea) na Plataforma Continental Sudeste do Brasil
• Beneficiário: Miodeli Nogueira Junior
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 11/00436-8 - Bases morfo-funcionais da alimentação e o papel trófico de Lychnorhiza lucerna (Scyphozoa, Rhizostomeae)
• Beneficiário: Renato Mitsuo Nagata
• Linha de fomento: Bolsas no Brasil - Doutorado