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Ecological aspects of syllids (Annelida: Polychaeta: Syllidae) on Thalassia testudinum beds in Venezuela

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Abstract

The spatial and temporal variations of syllids associated with the tropical Thalassia testudinum were studied at four seagrass beds in the Morrocoy National Park. The epifaunal syllids were collected at quarterly intervals throughout one year using a modified suction sampler. Possible relationships between sampling sites, months and species were evaluated by Principal Components Analysis. The spatial-temporal variability of the predominant species was tested by means of a 2-factor ANOVA with the sampling sites and months as factors. A total of 1138 individual syllids were collected, belonging to 41 species and 12 genera, of which Branchiosyllis, Exogone, Odontosyllis, Sphaerosyllis and Syllis showed the highest diversity. Spatial variations were defined by the species of Branchiosyllis (B. exilis, B. lorenae, B. oculata) whereas temporal variability was defined by certain species of Syllis(S. beneliahui, S. broomensis and S. prolifera), the latter also being the most species rich genus present. Of the 41 species found, only these six showed consistent presence–absence and abundance patterns. Species richness and abundance were significantly higher in March at all sampling sites. Collectively, the syllid fauna of the Morrocoy seagrass beds was richer than recorded from other similar habitats. These findings are discussed in relation to the physical and biotic factors that may affect the variability of syllid populations in these seagrass habitats.

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Authors and Affiliations

  1. Departamento de Biología de Organismos, Instituto de Tecnología y Ciencias Marinas, Universidad Simón Bolívar, Caracas, 1080 A. P. 89000, Venezuela

    David Bone

  2. Departamento de Biología (Zoología), Laboratorio de Biología Marina e Invertebrados, Universidad Autónoma de Madrid, Canto Blanco, 28049, Madrid, Spain Fax

    Guillermo San Martín

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  1. David Bone
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  2. Guillermo San Martín
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Bone, D., San Martín, G. Ecological aspects of syllids (Annelida: Polychaeta: Syllidae) on Thalassia testudinum beds in Venezuela. Hydrobiologia 496, 289–298 (2003). https://doi.org/10.1023/A:1026117503709

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