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Aphanizomenon issatschenkoi  and  Raphidiopsis mediterranea  were studied in the Mediterranean Lake Doirani during a cyanobacterial bloom (August–October 2004).  Aphanizomenon issatschenkoi  was clearly morphologically distinct from  R. mediterranea  on the basis of apical cells. The two species demonstrated an almost inverse temporal distribution, consistent preference for different water depths and negative correlation between their net growth rates.  Raphidiopsis mediterranea  exhibited a higher net growth rate (0.17 days −1 ) and dominated during warmer water periods, with high  Z  max / Z  sec  ratio and low but available inorganic nitrogen.  Aphanizomenon issatschenkoi  was more generalist, exhibiting slower net growth (0.10 days −1 ) and a broader distribution in relation to temperature and light, regularly forming heterocytes under low nitrogen conditions.  Aphanizomenon issatschenkoi  was also phylogenetically distinct from  R. mediterranea  on the basis of partial 16S rRNA gene sequence. The  R. mediterranea  typical morphotype corresponded to one phylotype in the well-defined 16S rRNA gene sequence cluster of  Cylindrospermopsis raciborskii . The formation of two specialized reproductive cells in the same individual of  R. mediterranea  is described for the first time and may indicate unknown alternative reproductive modes and lifestyles in planktonic Cyanobacteria.

Polyphasic evaluation of Aphanizomenon issatschenkoi and Raphidiopsis mediterranea in a Mediterranean lake