Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000

Between January 1997 and December 2000 daily data of sea surface temperature, sea level height and Ekman transport were taken, together with biweekly and monthly sampling of ichthyoplankton in a coastal station located in Valparaíso Bay. Samples were collected through vertical tows from 50 m depth t...

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Autores principales:	Landaeta,Mauricio F, Schrebler,Katherine, Bustos,Claudia A, Letelier,Jaime, Balbontín,Fernando
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2009
Materias:	larval fish seasonality Engraulis ringens Sardinops sagax
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572009000300005
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spelling	oai:scielo:S0718-195720090003000052010-03-31Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000Landaeta,Mauricio FSchrebler,KatherineBustos,Claudia ALetelier,JaimeBalbontín,Fernando larval fish seasonality Engraulis ringens Sardinops sagax Between January 1997 and December 2000 daily data of sea surface temperature, sea level height and Ekman transport were taken, together with biweekly and monthly sampling of ichthyoplankton in a coastal station located in Valparaíso Bay. Samples were collected through vertical tows from 50 m depth to surface with a conical net. From a total of 103 zooplankton samples, 71 samples had positive presence of ichthyoplankton; a total of 10,646 eggs and 1,189 larval fish were separated, corresponding to 6 and 20 taxa, respectively. Eggs specific composition was dominated by Engraulis ringens (35.5%), Merluccius gayi (32.7%) and Sardinops sagax (23.3%). For larvae, dominant species were M. gayi (53.5%), S. sagax (16.1%), E. ringens (13.7%), Hygophum bruuni (3.0%) and Prolatilus jugularis (2.9%). Specific taxa of both eggs and larvae showed fluctuations of their abundance at seasonal scale and according to the warm and cold phases of El Niño-Southern Oscillation (ENSO), similar to those observed in the physical time series data. Despite the strong differences in egg abundance in the period, only M. gayi eggs showed a significant increase during La Niña phase. In the ENSO 1997-2000 cycle, sea level height and Ekman transport showed strong differences between ENSO phases, but the whole diversity of the larval fish community was not affected. No significant differences in the diversity indices were detected, for Shannon index or for Simpson index. However, multivariate analyses showed that larval assemblages were significantly stratified according to the warm and cold phase of ENSO. Therefore, composition of ichthyoplankton was significantly affected by the ENSO cycle in the coastal area of Valparaíso between 1997 and 2000.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.44 n.3 20092009-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572009000300005en10.4067/S0718-19572009000300005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	larval fish seasonality Engraulis ringens Sardinops sagax
spellingShingle	larval fish seasonality Engraulis ringens Sardinops sagax Landaeta,Mauricio F Schrebler,Katherine Bustos,Claudia A Letelier,Jaime Balbontín,Fernando Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000
description	Between January 1997 and December 2000 daily data of sea surface temperature, sea level height and Ekman transport were taken, together with biweekly and monthly sampling of ichthyoplankton in a coastal station located in Valparaíso Bay. Samples were collected through vertical tows from 50 m depth to surface with a conical net. From a total of 103 zooplankton samples, 71 samples had positive presence of ichthyoplankton; a total of 10,646 eggs and 1,189 larval fish were separated, corresponding to 6 and 20 taxa, respectively. Eggs specific composition was dominated by Engraulis ringens (35.5%), Merluccius gayi (32.7%) and Sardinops sagax (23.3%). For larvae, dominant species were M. gayi (53.5%), S. sagax (16.1%), E. ringens (13.7%), Hygophum bruuni (3.0%) and Prolatilus jugularis (2.9%). Specific taxa of both eggs and larvae showed fluctuations of their abundance at seasonal scale and according to the warm and cold phases of El Niño-Southern Oscillation (ENSO), similar to those observed in the physical time series data. Despite the strong differences in egg abundance in the period, only M. gayi eggs showed a significant increase during La Niña phase. In the ENSO 1997-2000 cycle, sea level height and Ekman transport showed strong differences between ENSO phases, but the whole diversity of the larval fish community was not affected. No significant differences in the diversity indices were detected, for Shannon index or for Simpson index. However, multivariate analyses showed that larval assemblages were significantly stratified according to the warm and cold phase of ENSO. Therefore, composition of ichthyoplankton was significantly affected by the ENSO cycle in the coastal area of Valparaíso between 1997 and 2000.
author	Landaeta,Mauricio F Schrebler,Katherine Bustos,Claudia A Letelier,Jaime Balbontín,Fernando
author_facet	Landaeta,Mauricio F Schrebler,Katherine Bustos,Claudia A Letelier,Jaime Balbontín,Fernando
author_sort	Landaeta,Mauricio F
title	Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000
title_short	Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000
title_full	Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000
title_fullStr	Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000
title_full_unstemmed	Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000
title_sort	temporal fluctuations of nearshore ichthyoplankton off valparaíso, central chile, during the enso cycle 1997-2000
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572009000300005
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Temporal fluctuations of nearshore ichthyoplankton off Valparaíso, central Chile, during the ENSO cycle 1997-2000

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