Seasonal and spatial distributions of dinoflgellates in relation to environmental factors along the north and south coasts of Sfax (Tunisia, Eastern Mediterranean Sea)
| Autor: | Amira Rekik, Jannet Elloumi, Habib Ayadi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
lcsh:R5-920 010604 marine biology & hydrobiology Sfax coast 010501 environmental sciences 01 natural sciences Dinoflagellates Eastern mediterranean Geography Oceanography lcsh:Biology (General) Eastern Mediterranean Sea Environmental parameters lcsh:Medicine (General) lcsh:QH301-705.5 0105 earth and related environmental sciences |
| Zdroj: | Journal of Coastal Life Medicine, Vol 5, Iss 7, Pp 299-308 (2017) |
| ISSN: | 2309-6152 2309-5288 |
| Popis: | Objective: To compare the spatial and seasonal distribution of dinoflagellates in relation to environmental factors in north (restored) and south (not yet restored) coasts of Sfax. Methods: The present study was conducted during the year of 2010 and 2011 at 12 stations for evaluation of the spatial and seasonal distribution of dinoflagellates and abiotic parameters. Results: Results revealed a striking difference between the two coasts regarding pH with strong acidification of seawater in the south, which may be caused by industrial activity. Suspended matter was more in the north than in the south, which may be reasonably attributed to the recently added soil that has not yet fully stabilised. Inverted microscopy analysis of dinoflagellates showed 35 and 28 taxa in the north and south coasts of Sfax, respectively. Dinoflagellates developed in association with an important proliferation of common species like Gymnodinium sp., Prorocentrum lima and Prorocentrum micans. Two distinct associations of dinoflagellates species were identified: a north association involving an important abundance of Peridinium sp. and Protoperidinium sp., and a south assemblage concerning mainly Prorocentum triestinum. Chlorophyll a concentrations on the north [(2.48 ± 2.12) mg/L] and south [(4.95 ± 6.60) mg/L] coasts of Sfax were not correlated with dinoflagellates abundance, probably explained by the fact that an important number of dinoflagellates species are deprived of chloroplasts. The highest heterotrophic dinoflagellates mean abundance was recorded in south Sfax coast (1.64 × 102 cells/L) during summer. Conclusions: This study shows that environmental variables were in relation with the dinoflagellates community composition which exhibited clear variations over the study area. |
| Databáze: | OpenAIRE |
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