Phytoplankton class Density (No/mL) Bacillariophyceae 7166.8 Chlorophyceae 1672.97 Chrysophyceae 457.26 Cyanophyceae 382.31 Euglenophyceae 96.46 Pyrrophyceae 286.74 Xanthophyceae
1330.48 Note: Table made from bar graph.
This was the first time to observe Xanthophyceae
directly in the Estonian marine waters.
The work of collectors gathers information of the phyla: Cyanobacteria, Rhodophyta, Ochrophyta (including Phaeophyceae and Xanthophyceae
), Bacillariophyta, Chlorophyta and Charophyta, the best represented being Bacillariophyta and Rhodophyta.
In the 16S-like rRNA analysis we replaced the following genera used in Andersen's analysis with related organisms: Costaria for Laminaria (Phaeophyceae), Cylindrotheca for Biddulphia (Bacillariophyceae), Emiliania for Prymnesium (Prymnesiophyceae), Nannochloropsis for Vischeria (Eustigmatophyceae), Prorocentrum for Amphidinium (Dinophyceae) and Tribonema for Heterococcus (Xanthophyceae
The other classes, Xanthophyceae
, Euglenophyceae, Chrysophyceae, Cryptophyceae, Rhodophyceae and Dinophyceae, presented similar values along years and periods, varying around 0.5.103 individuals per [cm.sup.2].
The classes Euglenophyceae, Xanthophyceae
and Rhodophyceae presented lower abundances.
35 phytoplankton taxa were recorded of which 10 (28.6%) belong to Chlorophyceae (green algae) and Bacillariophyceae (diatom) respectively, 6 (17.1%) to Euglenophyceae (green flagellates), 3 (8.6%) to Cyanophyceae (blue-green algae), Chrysophyceae and Xanthophyceae
litorea, a filamentous heterokont (class Xanthophyceae
; Trench, 1975; West, 1979; Pierce et al., 1996; Rumpho et al., 2000).
The correlation values between different classes of phytoplankton and some physico-chemical parameters showed inverse relationship between Bacillariophyceae, Chlorophyceae, Euglenophyceae and xanthophyceae
with phosphate-phosphorus (Table 4).
Studies involving this substrate include an examination of the taxonomy of periphytic algae belonging to the classes Xanthophyceae
and Euglenophyceae carried out by Biolo and Rodrigues (2010), as well as the elucidation of the structure and dynamics of the periphyton; however, these latter works have been restricted to Argentina (POZZOBON; TELL, 1995; RODRIGUEZ et al., 2011; TELL, 1977; TESOLIN; TELL, 1996).