Dynamics of dinoflagellates and environmental factors during the summer in the Gulf of Gabes (Tunisia, Eastern Mediterranean Sea)

Zaher Drira; Asma Hamza; Malika Belhassen; Habib Ayadi; Abderrahmen Bouaïn; Lotfi Aleya

doi:10.3989/scimar.2008.72n159

Autores/as

Zaher Drira Université de Sfax, Faculté des Sciences de Sfax, Département des Sciences de la Vie
Asma Hamza Institut National des Sciences et Technologie de la Mer, Centre de Sfax
Malika Belhassen Institut National des Sciences et Technologie de la Mer
Habib Ayadi Université de Sfax, Faculté des Sciences de Sfax, Département des Sciences de la Vie
Abderrahmen Bouaïn Université de Sfax, Faculté des Sciences de Sfax, Département des Sciences de la Vie
Lotfi Aleya Université de Franche-Comté, Laboratoire de Chrono Environnement

DOI:

https://doi.org/10.3989/scimar.2008.72n159

Palabras clave:

Golfo de Gabes, dinoflagelados, dinocysts, nutrientes

Resumen

Se estudió la distribución espacial de la comunidad de dinoflagelados junto con los factores ambientales a lo largo de un gradiente desde la costa a mar abierto en el Golfo de Gabes (Túnez, Mediterráneo oriental). Las familias dominantes de dinoflagelados estuvieron representadas por Gymnodiniaceae (32%), Peridiniaceae (20%), Prorocentraceae (15%), Ceratiaceae (13%), and Ebriaceae (10%). La comunidad de dinoflagelados estuvo más concentrada a lo largo de la costa del Golfo que en mar abierto. Se detectaron 8 especies de dinoflagelados tóxicos entre los cuales, Karenia cf. selliformis (37% del total de dinoflagelados tóxicos) estuvo homogeneamente distribuida en la zona nerítica y en áreas de mar abierto. Dinocysts contribuyeron en un 33% del total de células móviles y fueron más abundantes a lo largo de la costa que en el mar abierto. Esta alta concentración puede adscribirse a los vertidos de nitrógeno dentro de las agues costeras de Gabes. Las corrientes Atlánticas gobiernan el desarrollo de los dinoflagelados en el mar abierto. La degradación de la cualidad del agua que acompaña la eutrofización del Golfo de Gabes puede tener consecuencias socio-económicas significativas. Nosotros sugerimos que el tipo de gestión de las aguas, similar al usado en ecosistemas de agua dulce sea desarrollado en la zona costera del Golfo, para así reducir de forma drástica las interferencias urbanas.

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