I found a bloom of cyanobacteria with filaments that look like Sphaerospermopsis aphanizomenoides if you see the dispositions Heterocyte_AKinete_Heterocyte and others features but i found some filaments with an elongated apical cell (fusiform) (i have tried to find Heteocytes or AKinetes but i didn't find).
Some suggestions?? Perhaps Aphanizomenon favaloroi?
Phytoplankton from a Reservoir fixed with lugol
Thanks in advance
Komvophoron cf. crassum (Vozzennikova) Anagnostidis & Komárek 1988 Tricomas solitários, curtos (25,2-123µm), moniliformes, não atenuados, septos translúcidos, não granulados; células em forma de barril, 2,3 – 2,8 mm diâmetro, 1,7 – 2,8 mm comprimento, sem aerótopos; célula apical com ápice arredondado. t índice das espécies Bibliografia: Malone, C.F.S. 2010. Biodiversidade de algas e cianobactérias de duas lagoas salinas do Pantanal Nhecolândia, MS, Brasil. Dissertação de Mestrado. Instituto de Botânica, São Paulo.
Maria Verdugo Althöfer
You might be on the right track. Certainly resembles members of the Family Aphanizomenonaceae with the vacuole less elongated apical cells. The absence of heterocyst in some of the trichomes could have been due to the presence of high concentration of DIN in the reservoir water.
Regards
José franciraldo Lima i think that all the filaments belongs to Heterocytous Genera.
Apical cells seems to be more rounded at the end, and akinetes more spherical than A. favaloroi. In A. favaloroi akinetes are not at both sides of heterocytes, just one akinete next to heterocyte, Dimensions of cells, akinetes and heterocytes? May be other Aphanizomenon/Chrysosporum species
Thanks Silvia Haydee Otaño for your answerd. It s true that my filaments looks different as those from your publication. But in the publication : First report of Aphanizomenon favaloroi ocurrence in Europe associated with saxitoxins and a massive fish kill in Lake Vistonis, Greece from Maria Moustaka-Gouni et all Marine and Freshwater research, 2016,67,1-8 there are some filaments with spherical akinetes and at both sides.
But perhaps it is must be another Aph/Chrysosporum or and hibridus
Thanks
Maria
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