https://www.socictopen.socict.org/items/show/27453
title: Importance of the Río de la Plata estuarine front (southwestern Atlantic Ocean) in the feeding ecology of Argentine anchovy, Engraulis anchoita (Clupeiformes, Clupeidae) Importancia del frente estuarial del Río de la Plata (Océano Atlántico sudoccidental) en la ecología trófica de la anchoíta argentina, Engraulis anchoita (Clupeiformes, Clupeidae)
subject: Alimentación, Argentina, Atlántico sudoccidental, Copepods, Copépodos, Engraulis anchoita, Southwestern Atlantic, Stomach content, contenido estomacal, estuarine front, feeding, frente estuarial
description: The feeding of Engraulis anchoita was studied in the coastal reproductive habitat of the northern population during the spawning period. Stomach contents of anchovy adults and plankton samples taken during a research cruise were examined. The highest stomach fullness values were found in the Rio de la Plata estuary, particularly at stations close to the surface salinity front. Copepods, particularly those < 1 mm total length, represented by Paracalanus spp. and Oithona spp., were the most abundant prey. The dominance of small copepods in the Argentine anchovy diet is noted for the first time. Ecological implications of this fact are discussed. Other abundant preys were appendicularians, cladocerans, and fish eggs. The species composition of the zooplankton samples coincided roughly with that found in the stomach contents. However, selective feeding was observed on preys > 1 mm total length. This might be explained by a low gill rakers efficiency of adult anchovies to retain small prey. In the Rio de la Plata front, both the reported large biomasses of zooplankton and the observed intense anchovy feeding revealed the ecological significance of this front, especially when compared with the contiguous 'poor in food' coastal areas.Se estudió la alimentación de la población norteña de Engraulis anchoita en el hábitat reproductivo costero durante su periodo de desove. Se analizaron los contenidos estomacales de adultos de anchoíta y muestras de zooplancton tomados durante un crucero de investigación. Los mayores valores de repleción estomacal se encontraron en el estuario del Río de la Plata, particularmente en estaciones cercanas al frente salino de superficie. Los copépodos fueron las presas más abundantes, particularmente especímenes < 1 mm de longitud total, representados por Paracalanus spp. y Oithona spp. Este dominio de pequeños copépodos en la dieta de la anchoíta argentina se destaca por primera vez. Se discutieron las implicancias ecológicas de este hecho. Otras…
creator: María D Viñas, Luciano N Padovani, Marcelo Pájaro
source: Latin American Journal of Aquatic Research
publisher: Escuela de Ciencias del Mar, Facultad de Recursos Naturales, Pontificia Universidad Católica de Valparaíso
date: 2011
relation: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2011000200002
coverage: Biology (General), Oceanography, Aquaculture. Fisheries. Angling