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:MFCav9 (2023)  -  DOI: https://doi.org/10.3354/meps14329

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Integration of empirical and modelled data unravels spatiotemporal distribution and connectivity patterns of Fuegian sprat early life stages

Virginia A. García Alonso1,2,*, Bárbara C. Franco3,4,5, Elbio D. Palma6,7, Marcelo Pájaro8, Fabiana L. Capitanio1,2

1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental (DBBE), Buenos Aires C1428EGA, Argentina
2CONICET-Universidad de Buenos Aires, Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), Buenos Aires C1428EGA, Argentina
3Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
4Centro de Investigaciones del Mar y la Atmósfera (CIMA), CONICET-Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
5Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI 3351 IFAECI)/CNRS-IRD-CONICET-UBA, Buenos Aires C1428EGA, Argentina
6Departamento de Física, Universidad Nacional del Sur, Bahía Blanca B8000FTN, Argentina
7Instituto Argentino de Oceanografía (IADO), CONICET-UNS, Bahía Blanca B8000FWB, Argentina
8Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata B7602HSA, Argentina
*Corresponding author:

ABSTRACT: The distribution patterns of fish early life stages are critical to recruitment success and closely related to major oceanographic circulation patterns. We explored the spatiotemporal distribution of early life stages of Fuegian sprat Sprattus fuegensis, a key trophic species in the Southwestern Atlantic Ocean (SWAO), in a complex oceanographic setting. Samples were collected during austral spring, summer, and autumn, from 2014 to 2017, across areas with distinct biophysical properties between Tierra del Fuego (TDF) and the marine protected area ‘Namuncurá’ at Burdwood Bank (BB) (ca. 54°S). Results revealed significant seasonal fluctuations in abundance, distribution, and ontogenetic composition across habitats. High egg and early larval abundances at Isla de los Estados (IE) suggest it is an additional spawning ground to those previously identified at TDF and BB. However, only the latter appear to be suitable nursery areas. Particle-tracking simulations based on egg abundance and spawning dates were conducted for the first time using results from a high-resolution hydrodynamic model. Particle transport provides evidence of connectivity between IE and neighbouring areas—enhanced when horizontal diffusivity is incorporated into the model—but not between TDF and BB. Simulated distributions closely resembled empirical patterns from this and other studies, allowing the integration of empirical and modelled data to schematize the species’ dispersal pathways in the study area. These results offer new insights into distribution and connectivity patterns among spawning grounds and highlight the potential use of hydrodynamic models for future assessments of Fuegian sprat and other planktonic species’ dispersal and recruitment in the SWAO.


KEY WORDS: Fuegian sprat · Early life stages · Spatiotemporal distribution · Particle tracking · Dispersal · Connectivity · Southwest Atlantic Ocean



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Cite this article as: García Alonso VA, Franco BC, Palma ED, Pájaro M, Capitanio FL (2023) Integration of empirical and modelled data unravels spatiotemporal distribution and connectivity patterns of Fuegian sprat early life stages. Mar Ecol Prog Ser :MFCav9. https://doi.org/10.3354/meps14329

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