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The spawning spatial structure of two co-occurring small pelagic fish off central southern Chile in 2005

Published online by Cambridge University Press:  17 May 2007

Claudio Castillo-Jordán ,
Luis A. Cubillos  and
Jorge Paramo
Claudio Castillo-Jordán
Affiliation:
Laboratorio de Evaluación de Poblaciones Marinas (EPOMAR), Departamento de Oceanografía, Universidad de Concepción, Casilla 160-C, Concepción, Chile
Luis A. Cubillos
Affiliation:
Laboratorio de Evaluación de Poblaciones Marinas (EPOMAR), Departamento de Oceanografía, Universidad de Concepción, Casilla 160-C, Concepción, Chile
Jorge Paramo
Affiliation:
Grupo de Investigación Ciencia y Tecnología Pesquera Tropical (CITEPT), Universidad del Magdalena, Carrera 32, N 22-08, Santa Marta, Colombia
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Abstract

Anchovy and common sardine co-occur in the same reproductive and feeding habitat off central southern Chile (33°00'–41°20'S), and have a similar reproductive strategy. Egg-survey data from one survey carried out during the austral winter in 2005 were used to analyze the spawning spatial structure of anchovy (Engraulis ringens) and common sardine (Strangomera bentincki) through geostatistical techniques and generalized additive models. The spawning spatial structure of both species was characterized by a spatial autocorrelation intensity varying similarly with distance in all directions, ranging between 27.2 and 32.6 km for anchovy and common sardine, respectively. In average, egg density of anchovy was higher than egg density of common sardine, with the bulk of the spawning for both species located in the southern sector of the study area (38°S–40°S). In this sector, both species showed an overlapped distribution, and egg densities were mainly associated to shallow and coastal zones, suggesting that coastal shape and bottom depth are important factors for the spawning of both species. In the south sector, the egg density of both species was positively correlated, indicating that spatial structure of the spawning is not explained by a different strategy of space occupation among anchovy and common sardine.

Keywords

Spatial structureGeostatisticsGAM modelingSpawning areasPelagic fish eggsAnchovySardine
Type
Research Article
Information
Aquatic Living Resources , Volume 20 , Issue 1: New developments in coastal environment research: results from the national coastal environment program , January 2007 , pp. 77 - 84
Copyright
© EDP Sciences, IFREMER, IRD, 2007

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