Associated fauna of the fan shell Pinna nobilis (Mollusca: Bivalvia) in the northern and eastern Tunisian coasts

Authors

  • Lotfi Rabaoui Research Unit of Biology, Ecology and Parasitology of Aquatic Organisms, Faculty of Sciences of Tunis
  • Sabiha Tlig-Zouari Research Unit of Biology, Ecology and Parasitology of Aquatic Organisms, Faculty of Sciences of Tunis
  • Andrea Cosentino Dipartimento di Biologia Animale ed Ecologia Marina, Università di Messina
  • Oum Kalthoum Ben Hassine Research Unit of Biology, Ecology and Parasitology of Aquatic Organisms, Faculty of Sciences of Tunis

DOI:

https://doi.org/10.3989/scimar.2009.73n1129

Keywords:

Pinna nobilis, epifauna, assemblages, β-diversity, spatial scale, Tunisian coasts

Abstract


Epifaunal communities associated with the fan shell Pinna nobilis Linnaeus, 1758 along the Tunisian coastline were investigated. Both univariate and multivariate analysis were done at different spatial scales within five populations located at different localities, three from northern and two from eastern Tunisia. The size of Pinna did not appear as the main factor affecting the structure of the associated biota, which seemed to be more influenced by (a) marine-lagoon and (b) biogeographic gradients. Patterns of similarity of sessile sclerobionts and motile epifauna were clearly different. The former assemblage best replied to lagoon-sea gradient and to locality, with three real clusters at 40%, whereas the latter assemblage scattered widely in a non-metrical MDS plane, with two real clusters only at 20% similarity. The spatial turnover of motile species was ten times higher than that of sessile species at a small spatial scale, being less affected by Pinna size, and three times higher though invariant at a large geographic scale. On the other hand, β-diversity of sessile species appeared to be more influenced by latitudinal (climatic) gradient at a large scale, being higher in the northern than in the eastern communities. Analysis of taxonomic (dis)similarity of the whole community detected these two sources of environmental (lagoon-sea gradient) and biogeographic (lati-longitudinal gradient) variation, although each phylum showed its peculiar pattern. In terms of Dajoz’s constancy index the majority of associated communities were dominated by rare species, and within the majority of epifaunal assemblages, the most abundant sessile epizoobiont was a bivalve mollusc. The sessile epifauna was dominated by active filterers, which led to a possible existence of trophic competition between the host and the sedentary epizoites, since both basibionts and sclerobionts occupy the same trophic niche. The fan shell played an important ecological role, providing new hard substrate to colonise, increasing the spatial heterogeneity for the surrounding soft-bottom communities, and contributing to the overall increase of the local biotope complexity level.

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References

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Published

2009-03-30

How to Cite

1.
Rabaoui L, Tlig-Zouari S, Cosentino A, Ben Hassine OK. Associated fauna of the fan shell Pinna nobilis (Mollusca: Bivalvia) in the northern and eastern Tunisian coasts. Sci. mar. [Internet]. 2009Mar.30 [cited 2024Mar.28];73(1):129-41. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1048

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