Abstract：
:The spatio-temporal distribution of epiphytic and planktonic microalgae coupled with environmental factors was investigated for a one-year period in the Gulf of Tunis (northeastern Tunisia). Harmful microalgae assemblages were dominated by three toxic epiphytic dinoflagellates: Ostreopsis sp., Prorocentrum lima and Coolia monotis. They were observed, both on macrophytes (1.03 × 105 cells g-1 FW ; 1.3 × 104 cells g-1 FW and 865 cells g-1 FW, respectively) and in the water column (2.35 × 104 cells L-1; 3.72 × 103 cells L-1; 1.04 × 103 cells L-1, respectively). Species abundances decreased with depth and maximum concentrations were found in shallow waters (0.5-1 m). The highest species abundance was registered both on macroalgae and seagrass with no special preference observed for either of these substrates. Redundancy analyses (RDA) show significant changes in these species abundances according to sites and seasons. The proliferation of Ostreopsis sp. is widespread in summer, when water temperature is warm, and especially in bay zones. The occurrence of P. lima and C. monotis blooms was mainly correlated to nutrients. In this study, macrophyte beds in the Gulf of Tunis were a reservoir of potentially toxic species that could pose a real threat, both to ecosystems and to public health.
journal_name
Harmful Algaejournal_title
Harmful algaeauthors
Hachani MA,Dhib A,Fathalli A,Ziadi B,Turki S,Aleya Ldoi
10.1016/j.hal.2018.06.006subject
Has Abstractpub_date
2018-07-01 00:00:00pages
29-42eissn
1568-9883issn
1878-1470pii
S1568-9883(18)30096-9journal_volume
77pub_type
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