Palabras clave
diversidad; bentos; procesos sedimentarios; reclutamiento; dinámica de nutrientes, moluscos; dinámica poblacional
Cómo citar
Resumen
Introducción: El afloramiento estacional es un desplazamiento de agua de mar superficial hacia la costa y su reemplazo por agua más profunda y fría con mayores niveles de nutrientes por la influencia del viento. En la costa norte del Pacífico de Costa Rica, el afloramiento está presente de diciembre a abril.
Objetivo: Dentro de esta área de afloramiento estacional, se muestreó la Bahía de Salinas para determinar si el afloramiento tiene un efecto sobre la diversidad, composición y gremios tróficos de la comunidad bentónica de fondos blandos.
Métodos: La bahía fue visitada durante las temporadas de afloramiento y no afloramiento de 2007-2009. Se tomaron de 6 a 9 muestras al azar en cada evento de muestreo.
Resultados: La riqueza y abundancia fueron menores en la temporada sin afloramiento y los valores más altos se observaron al final del afloramiento. La composición de taxones de los ensamblajes varió parcialmente a lo largo de las estaciones, dependiendo de la intensidad del afloramiento.
Conclusiones: La composición de especies fue más diversa y abundante al final de la temporada de afloramiento que al inicio o en la temporada sin afloramiento. Las diferencias en los conjuntos infaunales durante el afloramiento estacional podrían explicarse por el cambio en las características de la interfaz sedimento-agua, los nutrientes y los movimientos de sedimentos que promueven el aumento de la productividad planctónica y, por lo tanto, la disponibilidad de alimentos.
Citas
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