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Algologia 2013, 23(2): 201–216
https://doi.org/10.15407/alg23.02.201
New Taxa and Noteworthy Records

New for Black Sea specie Chaetoceros minimus (Bacillariophyta): natural observations and experimental researches

Pautova L.A.1, Silkin V.A.2,3, Lifanchuk A.V.2
Abstract

New for Black Sea algae species – small cell diatomea Chaetoceros minimus (Levander) Marino, Giuffré, Montresor et Zingone was discovered in spring 2005 in northeastern shelf water with maximum abundance 1.6·105 cell/L. In this period specie was registered in experimental work of natural phytoplankton continuous culture. In the end of May 2006 Ch. minimus was discovered in the water of northeastern part of Black Sea (4.4·105 cell/L) in the period of intensive bloom of coccolithophore Emiliania huxleyi (Lohm.) Hay et Mohl. In June 2011 this alien specie had intensive growth in the bath phytoplankton culture. By used experiments with nitrogen and phosphorus supply it was showed that the growth of Ch. minimus will be intensive in relatively high phosphorus concentration and low nitrogen concentration. Maximal specific growth rate of Ch. minimus is considerably exceeded this parameter of E. huxleyi and this alien specie has high capability to intrude in ecosystem and to be dominant specie in phytoplankton. The consequence of this introduction will be unpredictable.

Keywords: Black Sea, alien specie, phytoplankton, Chaetoceros minimus, nitrogen, phosphorus

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