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Productividad primaria en la Ciénaga Grande de Santa Marta, Colombia

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Author
Hernández-J., C.A.
Gocke, K.
Date
1990

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Abstract
Entre enero 1987 y enero 1988 se estudiaron la productividad primaria y una serie de factores relacionados con ella en la Ciénaga Grande de Santa Marta. La Ciénaga es una laguna costera de 423 km2 de área y de 1.6 m de profundidad media, situada en la costa caribeña de Colombia y sometida a una fluctuación fuerte de salinidad. Se trata de un sistema acuático con una alta concentración de seston y una gran productividad primaria. La concentración de clorofila "a" Fluctuó entre 5.6 y 181 ug I ' , el promedio anual fue de 59 ug I ' . La concentración de proteínas 0sciló entre 0.9 y 9.5 mg I"' , el promedio anual fue de 4.2 mg T1 . La productividad primaria bruta anual en la parte central de la Ciénaga fue de 1690 g C m-2 . Los valores extremos en todo el sistema fueron 1.40 y 16.3 g Cm-2 por día. La variación temporal y espacial de la productividad primaria en la Ciénaga está causada sobre todo por la entrada de aguas continentales, la productividad es más alta cuando la salinidad es baja. La productividad está también controlada por turbidez del agua y la disponibílidd de nutrientes. La capa fotosintética está restringida a menos de 1.5m por ía alta concentración de partículas. La proporción N:P, inorgánico, es en promedio 4:1 indicando que los compuestos nitrogenados son factores limitantes en el sistema lagunar. La alta productividad primaria de la Ciénaga Grande sostiene una importante pesquería artesanal. Los excedentes de la productividad son exportados al mar adyacente donde subsidian una extensa zona costera.
Between January 1987 and January 1988 the primary productivity and related parameters were studied in the Ciénaga Grande de Santa Marta. The Ciénaga ¡s a coastal lagoon wíth an área of 423 km"2 and mean depth of 1.6 m, which is located at the caribbean coast of Colombia. The saliníty fluctuates seasonally within a wide range. The system ¡s characterized by a high concentration of seston and a great primary productivity. The concentration of chlorophyll "a" ranged from 5.6to 181 ug I - 1 , the mean valué was 59 ug I'1 . The concentration of proteins was within the extremes of 0.9 and 9.5 mg T1 , the mean valué was 4.2 mg I ' . The gross primary productivity in the central part of the Ciénaga amounted to 1690 g C m""2 per year. Considering the temporal fluctuation ín the whole system the lowest and highest valúes were 1.40 and 16.3 g C m-2 per day. Highest productivity valúes were encountered when the salinity was low. The primary productivity is controlled by waterturbidity and availability of nutrients, thus, seasonal continental waters. The photosinthetic laver is restricted to less than 1.5 m due to the high particle concentration. The mean N:P relation was 4:1 which indicates that the nitrogen compounds are the limiting nutrients. The high primary productivity sustains an important local fishery. The coastal area in the vicinity of the Ciénaga Grande is benefitted by the export of particulated and dissolved organic matter produced in escess within the coastal lagoon.
Journal
Anales del Instituto de Investigaciones Marinas de Punta Betín
Issue/Article Nr
19-20
Publisher or University
INVEMAR, Santa Marta (Colombia)
URI
http://hdl.handle.net/1834/3886
Collections
2. Anales del Instituto de Investigaciones Marinas de Punta Betín

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