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Provedor de dados:  OceanDocs
País:  Belgium
Título:  Diversidad y distribución de la macro- y meiofauna (especialmente nemátodos) en el ecosistema arrecifal de Punta Francés, Cuba
Autores:  Ruiz Abierno, A
Data:  2014-06-06
Ano:  2013
Palavras-chave:  Microfauna
Meiofauna
Coral reefs
Ecosystems
Resumo:  Se estudió la diversidad y distribución de la macro- y meiofauna y los rasgos funcionales de nemátodos marinos en dos sitios y cuatro hábitats dentro del ecosistema arrecifal de Punta Francés, Isla de La Juventud, Cuba. Los hábitats seleccionados fueron: seibadal, arena, coral muerto y fondo duro, y se muestrearon en dos sitios dentro del arrecife (Punta Francés y Cabezo de Moya) en Junio del 2010. Se identificaron y contaron los organismos de la macro- y meiofauna en las muestras; los nemátodos fueron identificados hasta especie, se calculó su tamaño y biomasa y se clasificaron en grupos tróficos. Los hábitats de coral muerto y fondo duro por su heterogeneidad y cubierta de césped de algas tuvieron macro- y meiofauna más diversa. La meiofauna mostró mayor diversidad filética que la macrofauna indicando que es posiblemente el dominio de la biota más diverso en el arrecife. Las nemátodos fueron más abundantes en los fondos blandos posiblemente porque es el grupo que mejor explota el ambiente intersticial. El modo de vida epibéntico en los fondos duros implica mayor exposición a la hidrodinámica y muchas especies de nemátodos en estos hábitats tuvieron adaptaciones morfológicas para evitar la resuspensión. La riqueza observada de nemátodos fue de 156 ± 9 especies; ello indicó una elevada biodiversidad del grupo en el arrecife coralino. La talla y biomasa de los nemátodos dependió del tipo de hábitat, particularmente de la calidad del alimento. Los nemátodos más grandes estuvieron mejor adaptados a digerir el detrito que se acumula en el seibadal mientras que los nemátodos pequeños aparecieron en la arena posiblemente por estar restringidos a alimentarse del biofilm que ocurre sobre los granos de sedimento. Los nemátodos raspadores de epistrato fueron los más abundantes en el arrecife. En el hábitat de arena aumentó la proporción de depredadores, posiblemente debido a su homogeneidad espacial y al pequeño tamaño de otros nemátodos. También en este hábitat, la proporción de detritívoros disminuyó porque no están adaptados eficientemente a consumir el biofilm que es la principal fuente de materia orgánica.
Tipo:  Theses and Dissertations
Idioma:  Espanhol
Identificador:  http://hdl.handle.net/1834/5484
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