Preprints
https://doi.org/10.5194/egusphere-2022-216
https://doi.org/10.5194/egusphere-2022-216
 
06 May 2022
06 May 2022
Status: this preprint is open for discussion.

Planktonic cnidarian responses to contrasting thermohaline and circulation seasonal scenarios in a tropical western boundary current system

Everton Giachini Tosetto1,2,3, Arnaud Bertrand1,2,3,4, Sigrid Neumann-Leitão3, Alex Costa da Silva3, and Miodeli Nogueira Júnior5 Everton Giachini Tosetto et al.
  • 1MARBEC, Univ Montpellier, CNRS, IFREMER, IRD, Sète, 34200, France
  • 2Institut de Recherche pour le Développement, Sète, 34200, France
  • 3Departamento de Oceanografia, Universidade Federal de Pernambuco, Recife, 50670-901, Brazil
  • 4Departamento de Pesca e Aquicultura, Universidade Federal Rural de Pernambuco, Recife, 52171-900, Brazil
  • 5Departamento de Sistemática e Ecologia, Universidade Federal da Paraíba, João Pessoa, 58051-900, Brazil

Abstract. In western boundary current systems (WBCS), strong currents flow coastward carrying oceanic water masses and their associated planktonic fauna. Variation in the intensity of these currents and in the continental runoff may affect the dynamic interplay between oceanic and coastal communities. In addition, changes in the continental runoff and the thermohaline structure modulate the primary production, adding complexity to the dynamics of these oligotrophic systems. These dynamics likely shape the planktonic cnidarian communities. To further understand such relationships, we used a comprehensive dataset encompassing samples collected above the shelf, slope and around oceanic seamounts and islands of the Fernando de Noronha Ridge in the Western Tropical South Atlantic, in two seasons characterized by distinct thermohaline structure and circulation patterns. Results show that in this WBCS, coastward currents spread oceanic waters and their associated cnidarian species over the continental shelf. However, while both costal and oceanic communities co-occur when the continental runoff is notable, oceanic species dominate almost the entire shelf during the dry season characterized by a stronger boundary current intensity. We also conclude that when the mixed-layer depth and associated nutricline is shallower, the enhanced primary productivity supports larger populations of planktonic cnidarian species through a bottom-up control.

Everton Giachini Tosetto et al.

Status: open (until 01 Jul 2022)

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Everton Giachini Tosetto et al.

Everton Giachini Tosetto et al.

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Short summary
In the Western Tropical South Atlantic, coastward currents spread oceanic cnidarians over the continental shelf. While both costal and oceanic communities co-occur in scenarios of higher runoff and weaker boundary current intensity, oceanic species dominate almost the entire shelf during the dry season characterized by stronger currents. Meanwhile, offshore, when the mixed-layer, the enhanced primary productivity supports larger populations of planktonic cnidarians.