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Caracterización ecológica de la salina artificial Pozos colorados, Caribe colombiano

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Author
Mancera-P., J.E.
Date
1990

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Abstract
Un estudio ecológico de la salina marina Pozos Colorados se llevó a cabo entre enero y agosto de 1987. Si bien las dos estaciones de muestreo presentaron amplias diferencias entre si; en general la dinámica del ecosistema dependió aparentemente de la salinidad, la cual varió entre 75 y 341 °/oo; su incremento y la disminución del nivel de agua, al parecer generaron aumento de la temperatura y disminución del oxígeno disuelto, con rangos de 26,3 y 41 °C para la primera y O y 5,4 mg/l para el segundo. Aunque en promedio el pH fue neutro (7,5), este sistema reductor, caracterizado además por abundante materia orgánica, generó en ocasiones una ligera acidez (6,7). La producción primaria neta fue negativa en la mayoría de los casos, como resultado de una intensa actividad respiratoria, hecho que le confirió un carácter heterotrófico al sistema. La dinámica de las especies posiblemente estuvo determinada por la precipitación y el cambio en la proporción iónica, mostrando una sucesión dominada inicialmente por cianófitas bentónicas y Dunaliella viridis; un incremento en la salinidad acompañó la aparición de D. salina, la cual dominó en altas salinidades, antes del dominio absoluto de bacterias rojas y rosadas.
An ecological study of Pozos Colorados marine brine was carried out between January and August 1987. Although thetwosampled statíons weregreatly differenttoeach other in general, the dynamics of the ecosystem were apparently controlled by salinity, which varied between 75 and 341 °/oo; its ¡ncrease, accompanied by a decrease of the water leve!, possibly generated a temperature increament and a decrease of the dissolved oxygen, ranging between 26,3 and 41°C for the first and between O and 5,4 mg/l for the latter. Although the average pH was neutral (7,5), this reductíve environment, also characterized by the abundance of organic matter, ocassionally generated a slightacidity (6,7). The net primary production was negative ¡n most cases, as a result of an intense respiratory activity. Therefore, the system behaved as heterotrophic, using organic matter as subsidiary energy. The species dynamics was possibly determined by rain and ionic change relations, showing a succesion dominated initially by benthic cyanophites and Dunaliella viridis; an increase in salinity was followed by the appearance of Dunaliella salina, which dominated in high salinitíes, before the total dominance of red and pink bacteria began.
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/1834/3887
Collections
2. Anales del Instituto de Investigaciones Marinas de Punta Betín

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