Spatial and temporal variation of planktonic cnidarian density in subtropical waters of the Southern Brazilian Bight

Autor(es)

Nagata, Renato Mitsuo ^[1] ; Nogueira Junior, Miodeli ^[2] ; Brandini, Frederico Pereira ^[3] ; Haddad, Maria Angelica ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, BR-05508090 Sao Paulo - Brazil

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

^[3] Univ Sao Paulo, Inst Oceanog, Dept Oceanog Biol, BR-05508120 Sao Paulo - Brazil

^[4] Univ Fed Parana, Dept Zool, Programa Posgrad Zool, Ctr Politecn, BR-81531990 Curitiba, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Marine Biological Association of the United Kingdom; v. 94, n. 7, p. 1387-1400, NOV 2014.
• Citações Web of Science: 9

Resumo

The spatial and temporal variations of planktonic cnidarians were studied across the inner continental shelf (<= 40 m) off the State of Parana in southern Brazil. Monthly zooplankton samples were taken between November 1997 and March 1999 at five stations. The holoplanktonic Liriope tetraphylla and Muggiaea kochi dominated during the entire period, comprising >80% of the specimens. The coast-ocean gradient became evident due to a near-coastal (<= 20 m) assemblage formed by L. tetraphylla, Solmaris corona and meroplanktonic medusae, and a distinct outer (25-40 m) assemblage formed by the medusae Corymorpha gracilis and Aglaura hemistoma and siphonophores. The estuarine runoff during warm rainy periods lowered the salinity (similar to 30) at the inner stations (1, 2 and 3), providing appropriate conditions for the estuarine/coastal species. Wind-driven onshore advection of outer-shelf species to the inner isobaths occurred from late autumn to winter, when the rainfall decreased and salinity increased (>35). Population peaks occurred in both summer and winter at the inner stations. For most species, the seasonal patterns were inconsistent with other studies conducted in the Southern Brazilian Bight, suggesting irregular and unpredictable seasonal distributions of abundance. Whereas in high-latitude ecosystems the dynamics of cnidarian populations follows the seasonal productivity cycle, here, complex hydrographic processes seem to be more important in determining the structure and seasonal dynamics of this community. (AU)

• 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
• 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