Biology Reference
In-Depth Information
Figure 15:
Representatives of planktonic cyanobacteria from different water bodies of Czech Republic. Colonies (A, 300x) and
individual fi laments (B, 600x) of
Aphanizomenon klebahnii
;
Aphanizomenon aphanizomenoides
(C, 600x),
Anabaenopsis
cf.
elenkinii
(D, 400x),
Anabaena planctonica
(E, 300x), and
Anabaena fl os
-
aquae
(F, 300x). All are Nomarski contrast images downloaded
from www.FytoPlankton.cz with the kind permission of Dr. P. Znachor, Laboratory of Phytoplankton Ecology, Institute of
Hydrobiology, Biology Centre, ASCR, Na Sádkách, 37005 České Budějovice, Czech Republic.
that are totally not consistent with their generic and species identities. However, all the heterocystous
strains contained up to fi ve rrn operons with variable ITS regions in all the taxa investigated. As
observed in case of bacteria, in cyanobacteria too, the RB values and 16S rRNA sequence similarity are
at variance (Lachance, 1981). Iteman
et al
. (2002) showed that two strains of
Nodularia,
i.e.
Nodularia
PCC 7804 and PCC 7314 exhibited 98.3% 16S rDNA sequence similarity but only 65% RB (ΔT
m
6
