Scientia Marina, Vol 83, No 4 (2019)

Otolith elemental composition reveals separate spawning areas of anchoveta, Engraulis ringens, off central Chile and northern Patagonia


https://doi.org/10.3989/scimar.04918.28A

María José Cuevas
Programa de Magíster en Ciencias con mención en Pesquerías, Universidad de Concepción - Centro COPAS Sur-Austral y Laboratorio de Oceanografía Pesquera y Ecología Larval (LOPEL), Departamento de Oceanografía, Universidad de Concepción, Chile
orcid https://orcid.org/0000-0001-7487-4905

Konrad Górski
Departamento de Ecología, Facultad de Ciencias y Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción - Instituto de Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Chile
orcid https://orcid.org/0000-0003-1154-7717

Leonardo R. Castro
Centro COPAS Sur-Austral y Laboratorio de Oceanografía Pesquera y Ecología Larval (LOPEL), Departamento de Oceanografía, Universidad de Concepción, Chile
orcid https://orcid.org/0000-0001-7665-7883

Aurélien Vivancos
Departamento de Sistemas Acuáticos, Facultad de Ciencias Ambientales, Universidad de Concepción, Chile
orcid https://orcid.org/0000-0002-3229-1047

Malcolm Reid
Department of Chemistry, University of Otago, New Zealand
orcid https://orcid.org/0000-0002-4129-0214

Abstract


The anchoveta (Engraulis ringens) is widely distributed throughout the Humboldt Current (4°30′-44°S). In recent years, its eggs and larvae have also been found inside fjords and channels of northern Patagonia, close to the southern limit of the central-south Chilean fishery zone. Currently, it is unclear whether these southern individuals constitute an independent subpopulation. This study analysed the elemental composition of otoliths from 102 specimens from central Chile and northern Patagonia using laser ablation inductively coupled plasma mass spectrometry. The results indicated that the elemental composition of the otolith cores (Mg, Pb, Zn, Ba) differed significantly between sites, revealing the existence of two discrete spawning zones, one in central Chile and one in northern Patagonia. However, the low significant differences of elemental signatures of otolith edges suggest that either individuals from both areas move between spawning areas and mix at certain periods of the year, or they represent pocket units that form part of a larger stock that moves along the coast.

Keywords


LA-ICP-MS; anchovy; Humboldt Current; small pelagic fishes; Patagonia

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