The Influence of Ekman Transport on Zooplankton Biomass Variability off Southern Brazil

Resgalla, Charrid; Rocha, Christina De La; Montu, M.

doi:10.1093/plankt/23.6.641

Cited by 21 publications

(15 citation statements)

References 11 publications

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“…It was noted by Resgalla Jr. (2011) that this organism cannot be related to upwelling processes of short-duration due to the prevalence of northeast winds in this region. With these intrusions of deeper water into the euphotic zone, there is an increase in phytoplankton biomass, leaving an excess of primary production for the microbial loop that favors the development of organisms that feed on mucus (Resgalla Jr. et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

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The zooplankton of Santa Catarina continental shelf in southern Brazil with emphasis on Copepoda and Cladocera and their relationship with physical coastal processes

Domingos-Nunes

Resgalla

2012

lajar

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ABSTRACT. Very few studies have been carried out to exclusively investigate the zooplankton community of Santa Catarina State continental shelf, despite the economic and ecological importance of the area. This coastal region of southern Brazil presents highly relevant oceanographic processes, such as the strong influence of continental inputs, resurgence in the Cabo de Santa Marta Grande and River Plata plume water to the south. Two sampling cruises were carried out, in December 2005 and May 2006, in order to study temporal hydrological variations, and their influence on the biota of the region. Zooplankton samples for analysis were obtained by oblique hauls with Bongo nets at 33 sampling stations arranged in profiles perpendicular to the coast on each cruise. The predominant groups found in the samples were Copepoda, Cladocera, Salpidae and Chaetognatha, which presented higher densities at the stations closer to the coast. In the case of the December 2005 cruise, the salinity and temperature gradients perpendicular to the coast, promoted by the continental inputs to the north of the area and by the upwelling to the south, determined the limits of distribution of Acartia lilljeborgi and Penilia avirostris. However, the temperature and salinity gradients longitudinal to the coast determined on the May 2006 cruise did not explain the species distribution, indicating that biotic forcing mechanisms may have been active in the ecology of the system during this period.

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Section: Discussionmentioning

confidence: 99%

“…Its most austral portion lies within the Southern Brazilian Continental Shelf (SBCS), which extends from the Cape of Santa Marta to the border with Uruguay (Hille et al, 2008). In the SEBCS portion, the coast is aligned approximately northsouth, while in the SBCS portion the alignment is northeast-southeast (Resgalla Jr. et al, 2001).…”

Section: Study Areamentioning

confidence: 99%

The zooplankton of Santa Catarina continental shelf in southern Brazil with emphasis on Copepoda and Cladocera and their relationship with physical coastal processes

Domingos-Nunes

Resgalla

2012

lajar

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“…Biomass maxima due to coastal zooplanktonic species are restricted to a rather narrow band influenced by CW, decreasing towards the outer shelf regardless of the season (Navas-Pereira, 1973;Hubold and Gurgel, 1978;Hubold, 1980;Bonecker et al, 1990;Muxagata, 1999;Resgalla et al, 2001).…”

Section: Influence Of Physical Processes On Zooplankton and Ichthyoplmentioning

confidence: 99%

Zooplankton and ichthyoplankton distribution on the southern Brazilian shelf: an overview

Lopes¹,

Katsuragawa²,

Dias³

et al. 2006

Sci. Mar.

124

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SUMMARY:The southern Brazilian coast is the major fishery ground for the Brazilian sardine (Sardinella brasiliensis), a species responsible for up to 40% of marine fish catches in the region. Fish spawning and recruitment are locally influenced by seasonal advection of nutrient-rich waters from both inshore and offshore sources. Plankton communities are otherwise controlled by regenerative processes related to the oligotrophic nature of the Tropical Water from the Brazil Current. As recorded in other continental margins, zooplankton species diversity increases towards outer shelf and open ocean waters. Peaks of zooplankton biomass and ichthyoplankton abundance are frequent on the inner shelf, either at upwelling sites or off large estuarine systems. However, meandering features of the Brazil Current provide an additional mechanism of upward motion of the cold and nutrient-rich South Atlantic Central Water, increasing phyto-and zooplankton biomass and production on mid-and outer shelves. Cold neritic waters originating off Argentina, and subtropical waters from the Subtropical Convergence exert a strong seasonal influence on zooplankton and ichthyoplankton distribution towards more southern areas. This brief review highlights the need for further experimental studies on zooplankton life cycle strategies in order to understand the major processes controlling food web dynamics in this shelf ecosystem.Keywords: zooplankton, ichthyoplankton, distribution, biomass, water masses, upwelling, continental shelf, south-western Atlantic Ocean. RESUMEN: INFLUENCIA DE LOS PROCESOS FÍSICOS EN LA DISTRIBUCIÓN DEL ZOOPLANCTON E ICTIOPLANCTON: UNA REVISIÓN DE LOS ESTUDIOS REALIZADOS ENLA COSTA SUR DE BRASIL. -La costa sur de Brasil representa la principal zona de pesca de la sardina brasileña (Sardinella brasiliensis), especie responsable de más del 40% de las capturas de especies marinas de la región. El desove y el reclutamiento están influenciados localmente por la advección estacional de aguas ricas en nutrientes procedentes tanto de fuentes costeras como oceánicas. Por otro lado, las comunidades planctónicas son controladas por procesos regenerativos asociados a la naturaleza oligotrófica del Agua Tropical procedente de la Corriente de Brasil. Como se ha observado para otros márgenes continentales, la diversidad de especies del zooplancton aumenta hacia las aguas de la plataforma externa y de océano abierto. Máximos en la biomasa de zooplancton y la abundancia de ictioplancton son frecuentes en la plataforma interna, tanto en afloramientos como en grandes sistemas estuáricos. No obstante, la formación de meandros en la Corriente de Brasil proporciona un mecanismo adicional para la ascensión de las aguas frías y ricas en nutrientes del Atlántico Sur Central, aumentando la biomasa fito-y zooplanctónica y la producción en la plataforma media y externa. Las aguas neríticas frías procedentes del estuario de La Plata y las aguas subtropicales de la Convergencia Subtropical ejercen una fuerte influencia en la distribución del zoopl...

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“…These eddies, of 60 to 100 nautical miles diameter, cause upwelling of deep water layers in the centers of cyclonic movements (Hubold 1980a). The water mass that upwells in the Brazilian southwest coast is the South Atlantic Central Water (Ciotti et al 1995, Resgalla Jr. et al 2001.…”

Section: Discussionmentioning

confidence: 99%

Composition of Trichiuridae and Gempylidae larvae (Teleostei) and their association with water masses in the Southwest Atlantic Ocean

Júnior

Souza

Weiss

2009

Oceanological and Hydrobiological Studies

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In this paper the relationship between temporal changes in the occurrence of water masses and Trichiuridae and Gempylidae larvae composition and distribution in the Southwest Atlantic ocean were analysed between 25° and 40° S. Ichthyoplankton was collected during the three expeditions of the Subtropical Convergence Project: Winter and Spring 1977, Autumn 1978 and Summer 1981, realized in the Southwest Atlantic waters. Oblique tows were conducted using a Hensen net with 250 µm mesh size. Steep salinity and temperature gradient were found, where the * Corresponding author: pomafa@ufba.br † Deceased

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The Influence of Ekman Transport on Zooplankton Biomass Variability off Southern Brazil

Cited by 21 publications

References 11 publications

The zooplankton of Santa Catarina continental shelf in southern Brazil with emphasis on Copepoda and Cladocera and their relationship with physical coastal processes

The zooplankton of Santa Catarina continental shelf in southern Brazil with emphasis on Copepoda and Cladocera and their relationship with physical coastal processes

Zooplankton and ichthyoplankton distribution on the southern Brazilian shelf: an overview

Composition of Trichiuridae and Gempylidae larvae (Teleostei) and their association with water masses in the Southwest Atlantic Ocean

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