Larval fish assemblages off central Chile upwelling ecosystem

Landaeta, Mauricio F.; Veas, Rodrigo; Letelier, Jaime; Castro, Leonardo R.

doi:10.4067/s0718-19572008000300016

Cited by 24 publications

(18 citation statements)

References 44 publications

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“…The highest fish larval density (96%) was found in the first 100 m of the water column, a feature documented by other studies (Auth & Brodeur, 2006;Landaeta et al, 2008). The ichthyoplanktonic taxocenosis found off Punta Angamos (Peninsula de Mejillones) showed a mixture of coastal and oceanic species (epipelagic, epimesopelagic and mesopelagic).…”

Section: Community Structure In the Upwelled Filamentssupporting

confidence: 70%

Diel variation in the vertical distribution of fish larvae forced by upwelling filaments off Punta Angamos (northern Chile)

Rojas¹

2014

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ABSTRACT. The role of daily vertical migration (DVM) of ichthyoplanktonic associations off Punta Angamos, in northern Chile, was examined. In September 1998 and January 1999, two oceanographic surveys were conducted during coastal upwelling events. Fish larvae were collected during the day/night in three depth strata (0-20, 20-80 and 80-200 m) and inside/outside of upwelling filaments. The study area was dominated by a southward flow along 200 m depth; meanwhile, the Ekman layer did not exceed 20 m depth. The greatest accumulation of larvae was found in the middle layer (20-80 m), where the current velocity was low and did not interact with the circulation associated with upwelling the filament formation. Most fish larvae were found in non-upwelling waters in the middle stratum. Independent of the origin of water (upwelling/non-upwelling), larvae of Diogenichthys laternatus (Myctophidae), Engraulis ringens (Engraulidae) and Bathylagus nigrigenys (Bathylagidae) showed a deeper vertical distribution during the day, suggesting a daily vertical migration. This behavior can potentially increase retention of larvae near the coast in productive areas through vertical evasion of the Ekman layer during upwelling events. Keywords: fish larvae assemblages, vertical migratory behaviour, upwelling filament, northern Chile.Variación diaria en la distribución vertical de larvas de peces forzada por filamentos de surgencia frente a Punta Angamos (norte de Chile) RESUMEN. Se analizó el papel de la migración vertical diaria (DVM) en las asociaciones ictioplanctónicas frente a Punta Angamos (23°29'S, 70°59'W) norte de Chile. En septiembre de 1998 y enero de 1999 se realizaron dos campañas oceanográficas durante eventos de surgencia costera. Las larvas de peces fueron recolectadas durante el día/noche en tres estratos de profundidad (0-20, 20-80 y 80-200 m) y dentro/fuera de filamentos de surgencia. El área de estudio estuvo dominada por un flujo hacia el sur a lo largo de 200 m de profundidad, mientras que la capa de Ekman no excedió los 20 m. La mayor acumulación de larvas se encontró en el estrato medio (20-80 m), donde la velocidad de las corrientes fue baja y no interactuó con la circulación asociada a la formación de filamentos de surgencia. La mayoría de las larvas de peces fueron encontradas en aguas de nosurgencia en el estrato medio. Independiente del origen del agua (surgencia/no-surgencia), las larvas de Diogenichthys laternatus (Myctophidae), Engraulis ringens (Engraulidae) y Bathylagus nigrigenys (Bathylagidae) mostraron una distribución vertical más profunda durante el día que por la noche, lo que sugiere una migración vertical diaria. Este comportamiento de las larvas puede potencialmente aumentar la retención cerca de la costa en áreas productivas mediante la evasión vertical de la capa de Ekman durante eventos de surgencia. Palabras clave: asociaciones ictioplantónicas, comportamiento migratorio vertical, filamentos de surgencia, norte de Chile.

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Section: Community Structure In the Upwelled Filamentssupporting

confidence: 70%

Diel variation in the vertical distribution of fish larvae forced by upwelling filaments off Punta Angamos (northern Chile)

Rojas¹

2014

lajar

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“…The occurrence of upwelling is known to drive the ichthyoplankton assemblages in the eastern boundary coastal systems (Olivar and Shelton, 1993;Landaeta et al, 2008) and in the SBB , although it is generally considered weaker than the previous systems. The intrusion of the SACW toward the coast in the bottom layer is a hydrographic feature that enhances regional primary productivity and consequently, the fisheries (Brandini, 1990;Gasalla and Rossi-Wongtschowski, 2004).…”

Section: Introductionmentioning

confidence: 99%

Patterns in larval fish assemblages under the influence of the Brazil current

Katsuragawa

Dias

Harari

et al. 2014

Continental Shelf Research

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“…Larval sand stargazers are scarcely or completely absent in deeper waters of the shelf and slope off central Chile (Landaeta et al 2008), but they are collected in low abundance during daytime off central Chile (7.96 ± 4.97 ind. 1000 m -3 , Landaeta et al unpublished results).…”

Section: Discussionmentioning

confidence: 99%