engleski

The heterotrophic ebridian microflagellate Hermesinum adriaticum Zach. in the Adriatic sea

Hermesinum adriaticum Zach. is a rare non-photosynthetic flagellate with an internal siliceous skeleton. It is of uncertain taxonomic position and was, recently classified within dinoflagellates (Ebridiales). Subsurface accumulation of H. adriaticum Zach. (up to 380,000 cells l^1) was found around the brackish/seawater interface (BSI), in a small, saline coastal lake (Lake Rogoznica, central Adriatic coast), from March to November 1994. Dense populations of this species may be found only in stratified ecosystems with a well defined oxyc/hypoxic (anoxic) – H_2S enriched boundary layer. In Lake Rogoznica such conditions coincided with the BSI. The increasing gradient of phosphate, nitrate, ammonia and silicate concentrations provided evidence of a sharp chemocline below the BSI. In winter, an advective transport of H. adriaticum population was evident in the southeastern Adriatic; by inflowing northerly current from the eastern Mediterranean

phytoplankton; dinoflagellate; halocline; thermocline; chemocline; Adriatic Sea

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