Spatial patterns in planktonic cnidarian distribution in the western boundary current system of the tropical South Atlantic Ocean

Type Article
Date 2021-03
Language English
Author(s) Tosetto Everton GiachiniORCID1, Bertrand ArnaudORCID1, 2, 3, Neumann-Leitão SigridORCID1, Costa Da Silva AlexORCID1, Nogueira Júnior MiodeliORCID4, Irigoien Xabier
Affiliation(s) 1 : Departamento de Oceanografia, Universidade Federal de Pernambuco, Avenida Arquitetura, S/N, 50670-901, Recife, PE, Brazil
2 : Institut de Recherche pour le Développement (IRD), MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, 34200 Sète, France
3 : Departamento de Pesca e Aquicultura, Universidade Federal Rural de Pernambuco, Rua D. Manuel de Medeiros, S/N, 52171-900, Recife, PE, Brazil
4 : Departamento de Sistemática e Ecologia, Universidade Federal da Paraíba, Cidade Universitária, 58051-900, João Pessoa, PB, Brazil
Source Journal Of Plankton Research (0142-7873) (Oxford University Press (OUP)), 2021-03 , Vol. 43 , N. 2 , P. 270-287
DOI 10.1093/plankt/fbaa066
WOS© Times Cited 8
Keyword(s) medusae, siphonophores, tropical Atlantic Ocean, South Equatorial Current, North Brazil Undercurrent, Fernando de Noronha chain, Northeast Brazil

In marine western boundary systems, strong currents flowing coastward spread oceanic water masses over the continental shelves. Here we propose to test the hypothesis according to which oceanic cnidarian species may dominate western boundary system regions even in coastal waters. For that purpose we use a set of data collected above the shelf, slope and around oceanic seamounts and islands in the Western Tropical South Atlantic. Samples were acquired with a plankton net with 300 μm mesh size over 34 stations during an oceanographic cruise carried out in October 2015. Results reveal a diverse cnidarian assemblage in the area, extending the known distribution of many species. In addition, the Fernando de Noronha Chain and most of the narrow continental shelf presented a typical oceanic cnidarian community, dominated by holoplanktonic siphonophores. In this western boundary system, this condition was likely driven by the strong currents, which carry the oceanic tropical water and associated planktonic fauna toward the coast. A specific area with reduced influence of oceanic currents presented typical coastal species. The pattern we observed with the dominance of oceanic plankton communities up to coastal areas may be typical in western boundary systems characterized by a narrow continental shelf.

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Tosetto Everton Giachini, Bertrand Arnaud, Neumann-Leitão Sigrid, Costa Da Silva Alex, Nogueira Júnior Miodeli, Irigoien Xabier (2021). Spatial patterns in planktonic cnidarian distribution in the western boundary current system of the tropical South Atlantic Ocean. Journal Of Plankton Research, 43(2), 270-287. Publisher's official version : , Open Access version :