Changes in pelagic Polychaete assemblages along the California Current System
The composition, abundance, species richness and structural changes of the planktonic polychaete assemblages were analysed along a latitudinal transect in the California Current System ( California, U. S. A. and Baja California, Mexico). The biological ( species and abundance) and physical ( tempera...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2003 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Sistema de Información de la Facultad de Ciencias, UNAM |
| OAI Identifier: | oai:repositorio.fciencias.unam.mx:11154/141386 |
| Acceso en línea: | http://hdl.handle.net/123456789/1799 http://hdl.handle.net/11154/141386 |
| Access Level: | acceso abierto |
| Palabra clave: | Marine & Freshwater Biology species richness pelagic polychaetes California Current System |
| Sumario: | The composition, abundance, species richness and structural changes of the planktonic polychaete assemblages were analysed along a latitudinal transect in the California Current System ( California, U. S. A. and Baja California, Mexico). The biological ( species and abundance) and physical ( temperature and salinity) data were analysed using Principal Component Analysis (PCA). The principal water masses in the survey area were determined. Twenty-four holoplanktonic species belonging to families Alciopidae, Iospilidae, Lopadorhynchidae, Tomopteridae and Typhloscolecidae were identified. Three clear species assemblages were discerned in the PCA results: 1. A 'north group' (from Oregon-California border to San Francisco), with relatively high species richness (11) and the highest mean abundance (121 ind. per 500 m(3)) was characterised by Tomopteris septentrionalis, T. planktonis, Plotohelmis tenuis, and Travisiopis lobifera. California Current Water and Subtropical Central Water were present in the area occupied by this assemblage. 2. A 'south group' (from off Bahia Magdalena to Cabo San Lucas), with the highest species richness (16), but low mean abundance (37.8 ind. per 500 m(3)) |
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