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Zooplanktonic Crustacea and Ichthyoplankton of the Patagonian Shelf-Break Front

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The Patagonian Shelfbreak Front

Part of the book series: Aquatic Ecology Series ((AQEC,volume 13))

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Abstract

This chapter reviews information from the 1970s to the present day about zooplankton and ichthyoplankton occurring at the Patagonian shelf-break front (PSBF), aiming to establish a baseline of knowledge for both groups. Zooplankton information focuses on copepods, hyperiid amphipods, and euphausiids because of their abundance and relevance to the food web. General patterns of species diversity and biogeographic zonation of these zooplanktonic groups are described. Copepod diversity roughly increases northward, and the shelf-break front does not represent a sharp boundary between shelf and oceanic zooplankton species. Key species are defined, and data about their seasonal distribution, abundance, and life-history traits indicate that the same few species dominate the composition of these taxa all year round. The presence of larvae of some demersal and mesopelagic fish typical of cold sub-Antarctic waters denotes reproductive activity in the PSBF surroundings. Ichthyoplankton can be classified, according to bottom depths, as pertaining to the shelf-edge (80–200 m); slope (200–800 m); or oceanic regions (800–3100 m). Larvae show higher abundances immediately offshore of the front, especially above the thermocline. Copepods, especially their larval stages, constitute the main feeding source for fish larvae inhabiting along the shelf-break. Zooplankton and ichthyoplankton composition and abundance along the shelf-break are compared with those of the adjacent shelf. We finally go over open questions and prospects for future work on zooplankton and ichthyoplankton along the shelf-break.

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Abbreviations

ACS:

Argentine continental shelf

DVM:

daily vertical migrations

FAO:

Food and Agriculture Organization

OF:

occurrence frequency

PSBF:

Patagonian shelf-break front

INIDEP:

National Institute for Fisheries Research and Development

MCW:

Malvinas Current Waters

RII:

relative importance index

SASW:

Subantarctic Shelf Water

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Acknowledgments

The authors thank infinitely to Drs. F.C. Ramírez, M.E. Sabatini, M.D. Viñas, and J.D. de Ciechomski for all the knowledge transmitted over so many years along diverse academic instances, which was essential for tackling this chapter. Also, we wish to thank the scientists, technicians, and research vessel crews of INIDEP, CONICET, and other international agencies who got the plankton samples, which were indispensable and valuable material for building our present understanding of the crustacean zooplankton and ichthyoplankton along the Patagonian shelf-break. Special thanks must be given to G.L. Álvarez-Colombo and L.N. Padovani for amphipods data, to the heads of the several assessment groups at INIDEP for receiving and helping plankton researchers on board their stock assessment cruises, to INIDEP facilities, and to the financial support from all the institutions involved and the grants held by all the authors. This is INIDEP contribution No. 2308.

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Authors and Affiliations

  1. Instituto de Investigaciones Marinas y Costeras (IIMyC), Universidad Nacional de Mar del Plata, (UNMdP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina

    Georgina D. Cepeda, Ayelén Severo, Marina Do Souto & E. Marcelo Acha

  2. Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina

    Georgina D. Cepeda, Martín D. Ehrlich, Carla M. Derisio, Ayelén Severo, Laura Machinandiarena, Mariana Cadaveira, Paola Betti, Marina Do Souto & E. Marcelo Acha

  3. Facultad de Ciencias Exactas y Naturales (FCEN), Departamento de Ecología, Genética y Evolución (EGE), Universidad de Buenos Aires (UBA), Buenos Aires, Argentina

    Carolina Pantano

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  1. Georgina D. Cepeda
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  2. Martín D. Ehrlich
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  8. Marina Do Souto
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  9. Carolina Pantano
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  10. E. Marcelo Acha
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Correspondence to Georgina D. Cepeda .

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  1. UNMdP- CONICET, Instituto de Investigaciones Marinas y Costeras, Mar del Plata, Argentina

    E. Marcelo Acha

  2. INIDEP, Instituto Nacional Investigacion y Desarrollo Pesquero, Mar del Plata, Argentina

    Oscar Osvaldo Iribarne

  3. Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina

    Alberto Piola

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Cepeda, G.D. et al. (2024). Zooplanktonic Crustacea and Ichthyoplankton of the Patagonian Shelf-Break Front. In: Acha, E.M., Iribarne, O.O., Piola, A. (eds) The Patagonian Shelfbreak Front. Aquatic Ecology Series, vol 13. Springer, Cham. https://doi.org/10.1007/978-3-031-71190-9_4

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