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Additional information on the distribution and ecology of the recently described diatom species Geissleria gereckei

Danijela Vidakovic
Danijela Vidakovic
, 
Marco Cantonati
Marco Cantonati
, 
Marcella Mogna
Marcella Mogna
, 
Olga Jakovljević
Olga Jakovljević
, 
Sanja Šovran
Sanja Šovran
, 
Vladimir Lazović
Vladimir Lazović
, 
Katarina Stojanović
Katarina Stojanović
, 
Jelena Đorđević
Jelena Đorđević
 et 
Jelena Krizmanić
Jelena Krizmanić
   | 06 mars 2017
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Article Category: Original research paper
Publié en ligne: 06 mars 2017
Pages: 18 - 23
Reçu: 03 mai 2016
Accepté: 08 juil. 2016
DOI: https://doi.org/10.1515/ohs-2017-0002
© Faculty of Oceanography and Geography, University of Gdańsk, Poland. All rights reserved.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

(a-g) Light microscopy (LM) micrographs of Geissleria gereckei Cantonati et Lange-Bertalot. Scale bar = 10 μm
(a-g) Light microscopy (LM) micrographs of Geissleria gereckei Cantonati et Lange-Bertalot. Scale bar = 10 μm

Figure 2

Scanning electron microscopy (SEM) micrographs of Geissleria gereckei. (a) Inside view of the valve. (b) Valve outside view of the frustule; apically elongated areolae (annulus). (c) Distal ends (internally) and helictoglossa; annulus structure with warty outgrowths. Scale bar = 1 μm
Scanning electron microscopy (SEM) micrographs of Geissleria gereckei. (a) Inside view of the valve. (b) Valve outside view of the frustule; apically elongated areolae (annulus). (c) Distal ends (internally) and helictoglossa; annulus structure with warty outgrowths. Scale bar = 1 μm

Value ranges of physical and chemical parameters of the sites with Geissleria gereckei

Parameters/Sampling sites Rivers in Serbia Spring SE Alps (Trentino) Springs Alpine foothills (Verona Province, Lessinia) Springs in the south-western Alps
Raška River Mlava River AT0756 ML0622 DC1620 RF1477 MT1300 SB1050 MC1650 MC1652 MC1655 RP1800
Shading (1-5 scale) 2 1 1 1 4 3 1 1 1 2
Temperature (°C) 7.5-14 9.1-14.6 9.4 11 8.4 8.1 5.8 7 4 3.4 3.2 2
pH 7.02-8.23 6.95-7.95 7.6 7.3 8.4 7.39 8.33 8.31 8.48 8.56 8.43 8.9
Conductivity (μS cm-1) 305-420 389-490 356 411 200 105 125 175 198 200 201 170
Alkalinity (as mg CaCO3 l-1) 7-120.8 12.6-120.6 195 240 25 15.2 17.7 26 23 23 24 18.4
N-NH4+ (μg I-1) <18.9-473.8 <18.9-355.8 < 20 <100 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10
N-NO3- (μg I-1) 6300-7900 6900-9500 224 3160 45 147 481 565 361 373 230 319
TP (μg P I-1) 13.5-104.2 8.7-112.8 4 - - - - - - - - -
SRP (μg P I-1) 5.2-51.7 3.7-46.8 2 - - - - - - - - -
Cl-(mg l-1) 1.2-2.2 0.9-2 1.0 8.0 0.4 0.4 0.3 0.3 0.5 0.5 0.4 0.2
SO42-(mg l-1) 1.4-3.4 5.5-22.4 21.0 10.0 - 1.6 1.8 4.3 - - - -
% Geissleria gereckei 0.5-3 - <0.2 4.5 1.0 2.3 0.2 0.5 1.0 0.8/0.5 0.5 0.8
Substrate epil./epib. epilithon epilithon epilithon epilithon epilithon epilithon epilithon epilithon epil./epib. epilithon epilithon
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