Artículo
Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean
Spinelli, Mariela Lorena
; Derisio, Carla María
; Martos, Patricia; Pajaro, Marcelo; Esnal, Graciela Beatriz
; Mianzan, Hermes Walter
; Capitanio, Fabiana Lia
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Fecha de publicación:
07/2015
Editorial:
Taylor & Francis As
Revista:
Marine Biology Research
ISSN:
1745-1000
e-ISSN:
1745-1019
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In frontal systems, larvaceans generally comprise a significant fraction of the mesozooplankton. Given the low mobility of these organisms, their vertical distribution is directly influenced by the physical conditions of the water column. The main goal of this study was to investigate the day and night vertical distribution of the larvaceans Oikopleura dioica in the different sectors of the Península Valdés tidal front (42º- 45ºS;SW Atlantic Ocean), focusing on possible causes such as oceanographic conditions (well-mixed, frontal and stratified), feeding activities, reproductive behaviour and predation risks. Day and night samples were collected with a Multinet of 67 μm and 300μm mesh size, from two depth layers. Conductivity-temperature-depth (CTD)profiles were also recorded. In the well-mixed waters, the size structure of O. dioica was similar in the upper and lower layers both in the day and night samples, probably due to the continuous vertical movement caused by the turbulent mixing of waters. In the frontal and stratified areas, mature animals were found in the upper layers during the night, possibly due to their aggregation in surface waters for synchronized spawning. In these areas, a high percentage of well-fed larvaceans was also found. Principal components analysis showed that, at night, the abundance of potential predators such as chaetognaths, ctenophores and anchovy larvaewere correlated with the parameter of stability of the water column (Simpson parameter), and that these were more abundant in the upper layers of the stratified area containing larvaceans. Our results suggest that the degree of stratification of the water column was the main factor affecting the vertical distribution of O. dioica.
Palabras clave:
LARVACEANS
,
VERTICAL DISTRIBUTION
,
OCEANOGRAPHI CONDITIONS
,
TIDAL FRONT
,
SW
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Identificadores
Colecciones
Articulos(CCT - MAR DEL PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Articulos(IBBEA)
Articulos de INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Articulos de INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Articulos(IIMYC)
Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Citación
Spinelli, Mariela Lorena; Derisio, Carla María; Martos, Patricia; Pajaro, Marcelo; Esnal, Graciela Beatriz; et al.; Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean; Taylor & Francis As; Marine Biology Research; 11; 6; 7-2015; 633-643
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