Phytoplankton

Víquez, Roxana; Hargraves, Paul E.

doi:10.1007/978-1-4020-8278-8_4

Cited by 2 publications

(1 citation statement)

References 42 publications

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“…En el Golfo de Nicoya, este dinoflagelado fue un componente frecuente de las floraciones algales que se formaron (Víquez & Hargraves, 1995), sin embargo, en el 2005 se registra por primera vez como la especie responsable (Huo & Shu, 2005); se considera que es euritérmica y eurihalina, encontrándose sobre todo en aguas ricas en nutrientes. Estudios realizados en la plataforma continental de Long Island (EE.…”

Section: Discussionunclassified

Floraciones algales nocivas durante el periodo 2008-2010 en el Golfo de Nicoya, Costa Rica

Vargas¹,

Artavia²,

Abarca³

2016

Rev. Mar. Cost.

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RESUMENEn este estudio se analizaron los eventos de floraciones algales nocivas (FAN) en cuatro estaciones de muestreo fijas en el Golfo de Nicoya durante el periodo de enero de 2008 a diciembre de 2010. Se recolectaron muestras de agua a 1 y 5 m de profundidad durante cada evento de FAN. Además, se midieron in situ los parámetros fisicoquímicos: profundidad del disco de Secchi, temperatura, salinidad, oxígeno disuelto y el porcentaje de saturación de oxígeno del agua. Los datos de radiación solar y precipitación fueron suministrados por el Instituto Meteorológico Nacional de Costa Rica. Se determinaron las concentraciones de las microalgas responsables y las especies asociadas. Se registraron 11 eventos, de los cuales el 72.7% se presentaron en la época lluviosa y un 27.3% en la época seca, la mayoría de éstos, durante el fenómeno atmosférico de La Niña. Las especies responsables fueron los dinoflagelados Alexandrium monilatum, Levanderina fissa, Cochlodinium polykrikoides y Prorocentrum minimum, la diatomea Skeletonema costatum y la cianobacteria Trichodesmium erythraeum. Las especies asociadas que se registraron con mayor frecuencia fueron los dinoflagelados Dinophysis caudata, Prorocentrum micans, Tripos fusus, Tripos furca y Protoperidinium conicum. Las FAN en el Golfo de Nicoya fueron más frecuentes durante la época lluviosa, probablemente debido a los aportes fluviales al sistema estuarino de los ríos Tempisque, Barranca y Grande de Tárcoles. Esa estacionalidad, en conjunto con las alteraciones provocadas por eventos atmosféricos globales como La Niña y El Niño, determinó la formación de FAN en el golfo durante el periodo de estudio.Palabras claves: Floraciones algales nocivas, microalgas responsables, condiciones ambientales, El Niño y La Niña, Golfo de Nicoya. ABSTRACTHarmful Algal Blooms (HABs) events were analyzed in this study at four monitoring stations in the Gulf of Nicoya between January 2008 and December 2010. Water samples were collected at 1 and 5 m deep during each HAB event. Furthermore, the following physicochemical parameters were measured in situ: Secchi disk depth, temperature, salinity, dissolved oxygen, and saturation percentage of oxygen in water. Radiation and precipitation data was provided by the National Meteorological Institute of Costa Rica. The concentration of dominant microalgae and associated species was determined. A total of 11 events were recorded, 72.7% during rainy season and 27.3% during dry season, most of them during the La Niña atmospheric phenomenon. Dominant species included the following dinoflagellates; Alexandrium monilatum, Levanderina

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Section: Discussionunclassified

Floraciones algales nocivas durante el periodo 2008-2010 en el Golfo de Nicoya, Costa Rica

Vargas¹,

Artavia²,

Abarca³

2016

Rev. Mar. Cost.

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Marine biodiversity baseline for Área de Conservación Guanacaste, Costa Rica: published records

Cortés

2017

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The diversity of tropical marine organisms has not been studied as intensively as the terrestrial biota worldwide. Additionally, marine biodiversity research in the tropics lags behind other regions. The 43,000 ha Sector Marino of Área de Conservación Guanacaste ( ACG , Marine Sector of Guanacaste Conservation Area), on the North Pacific coast of Costa Rica is no exception. For more than four decades, the terrestrial flora and fauna has been studied continuously. The ACG marine biodiversity was studied in the 1930’s by expeditions that passed through the area, but not much until the 1990’s, except for the marine turtles. In the mid 1990’s the Center for Research in Marine Science and Limnology ( CIMAR ) of the Universidad de Costa Rica ( UCR ) initiated the exploration of the marine environments and organisms of ACG . In 2015, ACG , in collaboration with CIMAR , started the BioMar project whose goal is to inventory the species of the marine sector of ACG (BioMar ACG project). As a baseline, here I have compiled the published records of marine ACG species, and found that 594 marine species have been reported, representing 15.5% of the known species of the Pacific coast of Costa Rica. The most diverse groups were the crustaceans, mollusks and cnidarians comprising 71.7% of the ACG species. Some taxa, such as mangroves and fish parasites are well represented in ACG when compared to the rest of the Costa Rican coast but others appear to be greatly underrepresented, for example, red algae, polychaetes, copepods, equinoderms, and marine fishes and birds, which could be due to sampling bias. Thirty species have been originally described with specimens from ACG , and 89 species are not known from other localities on the Pacific coast of Costa Rica except ACG . Most of the sampling has been concentrated in a few localities in Sector Marino, Playa Blanca and Islas Murciélago, and in the nearby waters of Bahía Santa Elena. In an effort to fill this gap, CIMAR is collaborating with ACG and a private foundation to start an inventory of the marine organisms of the conservation area. The project will be assisted by two marine parataxonomists, and all samples will be catalogued, photographed, bar coded and voucher specimens deposited at the Museo de Zoología, UCR . All the information will be available through Internet. It is anticipated that the BioMar project will fill many of the knowledge gaps and significantly more marine species will be encountered. This project could become a viable model for marine biodiversity inventories in other Costa Rican Conservation Areas (Áreas de Conservación) and in other countries.

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Phytoplankton

Cited by 2 publications

References 42 publications

Floraciones algales nocivas durante el periodo 2008-2010 en el Golfo de Nicoya, Costa Rica

Floraciones algales nocivas durante el periodo 2008-2010 en el Golfo de Nicoya, Costa Rica

Marine biodiversity baseline for Área de Conservación Guanacaste, Costa Rica: published records

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