Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event

The trophic dynamics of the plankton from the Gulf of Nicoya, a tropical estuary in the Pacific coast of Costa Rica, was conducted during dry and rainy seasons of 1997. Water temperature, oxygen and salinity were measured at two different light penetration depths. Inorganic nutrients, total and nann...

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Autores principales:	Brugnoli-Olivera,Ernesto, Morales-Ramírez,Alvaro
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2008
Materias:	Plankton grazing rate Pacific Ocean
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000100008
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spelling	oai:scielo:S0718-195720080001000082008-07-21Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 eventBrugnoli-Olivera,ErnestoMorales-Ramírez,Alvaro Plankton grazing rate Pacific Ocean The trophic dynamics of the plankton from the Gulf of Nicoya, a tropical estuary in the Pacific coast of Costa Rica, was conducted during dry and rainy seasons of 1997. Water temperature, oxygen and salinity were measured at two different light penetration depths. Inorganic nutrients, total and nannophytoplanktonic chlorophyll a were determined at each depth and additional samples were taken for phytoplankton taxonomic work. Oblique zooplankton hauls were done and abundance, composition and dry weight of zooplankton were determined. Indirect grazing rate estimate was calculated using the pigment budget. The study period coincided with an El Niño event detected in the Punta Morales zone and reflected by a change in the physico-chemical water characteristics. Some nutrient concentrations were correlated to the salinity, and significant differences were observed between the transition and rainy seasons in the phytoplankton biomass of the two fractions. A total of 43 phytoplankton taxa were identified and flagellates, centric and pennate diatoms represented 90% of the total phytoplankton abundance. In the zooplanktonic samples, copepods were the most abundant group and Acartia lilljeborgii, Pseudodiaptomus sp. and Paracalanus parvus were the dominant herbivores; dry weight mean values of herbivorous copepods were between 0.6 and 50 mg m-3. Grazing rate showed a mean of 0.67 ± 0.83 d-1. This study showed a seasonal behavior with changes in nutrient concentrations, availability of phytoplankton and rising temperatures through El Niño. Predation and grazing pressure produced changes in the structure of plankton (phyto and zooplankton) populations in the internal zone of Gulf of Nicoyainfo:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.43 n.1 20082008-04-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000100008en10.4067/S0718-19572008000100008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Plankton grazing rate Pacific Ocean
spellingShingle	Plankton grazing rate Pacific Ocean Brugnoli-Olivera,Ernesto Morales-Ramírez,Alvaro Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event
description	The trophic dynamics of the plankton from the Gulf of Nicoya, a tropical estuary in the Pacific coast of Costa Rica, was conducted during dry and rainy seasons of 1997. Water temperature, oxygen and salinity were measured at two different light penetration depths. Inorganic nutrients, total and nannophytoplanktonic chlorophyll a were determined at each depth and additional samples were taken for phytoplankton taxonomic work. Oblique zooplankton hauls were done and abundance, composition and dry weight of zooplankton were determined. Indirect grazing rate estimate was calculated using the pigment budget. The study period coincided with an El Niño event detected in the Punta Morales zone and reflected by a change in the physico-chemical water characteristics. Some nutrient concentrations were correlated to the salinity, and significant differences were observed between the transition and rainy seasons in the phytoplankton biomass of the two fractions. A total of 43 phytoplankton taxa were identified and flagellates, centric and pennate diatoms represented 90% of the total phytoplankton abundance. In the zooplanktonic samples, copepods were the most abundant group and Acartia lilljeborgii, Pseudodiaptomus sp. and Paracalanus parvus were the dominant herbivores; dry weight mean values of herbivorous copepods were between 0.6 and 50 mg m-3. Grazing rate showed a mean of 0.67 ± 0.83 d-1. This study showed a seasonal behavior with changes in nutrient concentrations, availability of phytoplankton and rising temperatures through El Niño. Predation and grazing pressure produced changes in the structure of plankton (phyto and zooplankton) populations in the internal zone of Gulf of Nicoya
author	Brugnoli-Olivera,Ernesto Morales-Ramírez,Alvaro
author_facet	Brugnoli-Olivera,Ernesto Morales-Ramírez,Alvaro
author_sort	Brugnoli-Olivera,Ernesto
title	Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event
title_short	Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event
title_full	Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event
title_fullStr	Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event
title_full_unstemmed	Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event
title_sort	trophic planktonic dynamics in a tropical estuary, gulf of nicoya, pacific coast of costa rica during el niño 1997 event
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000100008
work_keys_str_mv	AT brugnolioliveraernesto trophicplanktonicdynamicsinatropicalestuarygulfofnicoyapacificcoastofcostaricaduringelnino1997event AT moralesramirezalvaro trophicplanktonicdynamicsinatropicalestuarygulfofnicoyapacificcoastofcostaricaduringelnino1997event
_version_	1714202268654370816

Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event

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