Seasonal and daily fluctuation of diatoms during spring tide periods in Kerkennah Islands
| Autor: | Mounir Ben brahim, Wafa Feki-Sahnouna, Morsi Feki, Mabrouka Mahfoudi, Asma Hamza |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Journal of Coastal Life Medicine, Vol 3, Iss 6, Pp 446-452 (2015) |
| ISSN: | 2309-6152 2309-5288 |
| Popis: | Objective: To study seasonal and the daily distribution of diatoms in the three tidal periods (flood, slack and ebb period) during the spring tide. Methods: Water samples were taken and environmental variables were measured three times in each tidal period during 10 days of spring tide. Sampling was done in 2007 in Cercina station located in the western coast of Kerkennah (34°41'27'' N; 11°07'45'' E) (Southern Tunisia). Results: Nutrients showed significant variation between seasons, increasing in spring and decreasing noticeably in autumn and winter. About 36 diatom species were found. Results revealed a remarkable abundance increase in spring and summer. Irregular differences in diatom abundances were revealed over the tidal periods, with the highest rates being detected during the flood and the ebb period, while the abundance rate was lowest during the slack period. This could presumably be attributed to the increase of nutrient supply of suspended particulate matter during water motion. The results revealed a correlation between diatom abundance and temperature, NO2 - , NO3 - , Si(OH)4 and PO4 3 . Temperature seemed to be the most important factors which may influence the distribution and diatom abundance. Conclusions: Tide has various effects on the nutrients status and diatoms community (in terms of species composition, succession and abundance) between different tidal periods. Fluctuation of diatoms was correlated with changes in the circulation of water bodies and changes in nutrient regime. |
| Databáze: | OpenAIRE |
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