Temporal variation of the algae-associated molluscan assemblage of artificial substrata in Bay of Tunis (Tunisia)
| Autor: | Mouna Antit, José L. Rueda, Carmen Salas, A. Daoulatli |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
lcsh:SH1-691
Diversity Environmental Engineering biology Ecology Mytilaster minimus Tricolia littoral fauna annual cycle Aquatic Science Oceanography biology.organism_classification lcsh:Aquaculture. Fisheries. Angling Nassarius Rocky shore Dominance (ecology) Bittium reticulatum Gibbula racketti Species richness Ecology Evolution Behavior and Systematics |
| Zdroj: | Mediterranean Marine Science; Vol 14, No 2 (2013); 390-402 Mediterranean Marine Science, Vol 14, Iss 2, Pp 390-402 (2013) |
| ISSN: | 1108-393X 1791-6763 |
| Popis: | The molluscan assemblage inhabiting the photophilous algae from artificial rocky shores in theBay of Tunis) was studied from February 2009 to February 2010. Five monthly replicates were taken with a quadrat of 25 × 25 cm .. A total of 16105 individuals of molluscs, belonging to 93 species, were collected. Gastropods were the most species-rich group, with 66 species (70.96%), followed by bivalves with 26 species (27.95%). Gastropods were also the most abundant with 11529 individuals (71.60%), followed by bivalves with 4575 individuals (28.41%). Nevertheless, Mytilaster minimus was the dominant species overall during the studied period (15.6% of total abundance), followed by Tricolia miniata (11.6%), Bittium reticulatum (11.5%), Gibbula racketti (10.4%) and Rissoa similis (9.8%). The high abundance of juveniles of soft (e.g. Venerupis aurea , Nassarius corniculum ) and hard bottom species (e.g. M. minimus, Fissurella nubecula ) point out the important role of this habitat as nursery for species from nearby located habitats. The presence of the alien molluscs Mitrella psilla (2.5% dominance) and Arcuatula senhousia highlights the importance of algae as vehicle and/or receptor habitat for alien species. Species richness and abundance displayed significant seasonal changes, with maxima in winter 2009, but the Shannon-Wiener diversity index showed similar values throughout the year. Multivariate analyses also indicated the presence of significant seasonal differences of this molluscan assemblage. |
| Databáze: | OpenAIRE |
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