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Título : Interannual differences in growth and hatch-date distributions of early juvenile European anchovy in the Bay of Biscay: implications for recruitment
Autor : Aldanondo, Naroa; Cotano, Unai; Goikoetxea, Nerea; Boyra, Guillermo; Ibaibarriaga, Leire; Irigoien, Xabier
Citación : FISHERIES OCEANOGRAPHY, 2016, 25, 147-163
Resumen : In order to understand better the recruitment variability in European anchovy in the Bay of Biscay, it is important to investigate the processes that affect survival during the early life stages. Anchovy juvenile growth trajectories and hatch-date distributions were inferred over a 3-year period based on otolith microstructure analysis. Otolith growth trajectories showed a characteristic shape depending on their hatch-date timing. Earlier-born juveniles had notably broader maximum increments than later born conspecifics, resulting in higher growth rates. This observation suggests that early hatching would be beneficial for larval and juvenile growth, and, therefore, survival. The estimated juvenile hatch-date distributions were relatively narrow compared with the extended anchovy spawning season (March-August) in the Bay of Biscay and indicated that only individuals originated mainly from the summer months (June-August) survived until autumn. Hatch-date distributions were markedly different among years and seemed to influence the interannual recruitment strength of anchovy. We conclude that years characterized by juvenile survivors originating from the peak spawning period (May and June) would lead to considerable recruitment success. Downwelling events during the peak spawning period seem to affect larval survival. Furthermore, size-dependent overwinter mortality would be an additional process that regulates recruitment strength in the anchovy population in the Bay of Biscay.
Palabras clave : Anchovy; Bay of Biscay; Engraulis encrasicolus; Growth; hatch-date distribution; juveniles; recruitment; ENGRAULIS-ENCRASICOLUS-L.; SARDINE SARDINA-PILCHARDUS; SPRAT SPRATTUS-SPRATTUS; OTOLITH MICROSTRUCTURE; SPATIAL-DISTRIBUTION; SELECTIVE PREDATION; BALTIC SEA; BODY-SIZE; LARVAL; PATTERNS
Fecha de publicación : 2016
Editorial : WILEY-BLACKWELL
Tipo de documento: Article
Idioma: Inglés
DOI: 10.1111/fog.12142
URI : http://dspace.azti.es/handle/24689/163
ISSN : 1054-6006
E-ISSN: 1365-2419
Patrocinador: Education, Universities and Research Department of the Basque Country Government
SAVOR \[REN2002-04205-C04-04]
JUVENA (Department of Agriculture, Fisheries and Food of the Basque Country Government)
JUVENA (Spanish Ministry of Agriculture and Fisheries)
Aparece en las tipos de publicación: Artículos científicos



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