Ulva fenestrata
Creators: name: Rautenberger, Ralf
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Plantae
Chlorophyta
Ulvophyceae
Ulvales
Ulvaceae
Ulva
Ulva fenestrata

description: 3.2 Small- and large-scale experiments with Ulva fenestrata treated with GeO 2
In the small-scale experiment, the RGR and all three photosynthetic parameters of Ulva fenestrata were statistically similar between the control (0 mg GeO 2 l −1) and the 3 GeO 2)
standard deviations. Lowercase letters above columns indicate
statistically significant differences between the treatments (P <0.001,
1-way ANOVA, Tukey-Kramer HSD post-hoc test).
20 photons 0.25 0.30
)
15
−
1
1
−
%
d
ETR
μmol0.20
(10
0.15
RGR 5 α electrons 0.05 0.10
0 μmol 0.00
0 0.022 0.223 2.235 (0 0.022 0.223 2.235 Figure 3: Physiological parameters of the small-scale cultivation of Ulva fenestrata with GeO 2.
40)
) 1
(A) Relative growth rates (RGR),
1
− − s200
s
2 (B) photosynthetic electron transport
−
2 −
m
30
m
efficiencies (α ETR), (C) maximum electron
ETR
electrons max
20 photons 150
100 transport
fenestrata
saturation rates
after
points (
small-scale
ETR of max photosynthesis) and
cultivation
(D) light (E k
(
)
5
of
days
Ulva
) 10
μmol μmol
(
E
(
k 50 in tions 1-l glass at 140 beakers µmol photons with four m −2 GeO s −1 2 and concentra- 9 ° C.
0 0
Data are means of three replicates per treat-
0 0.022 0.223 2.235 0 0.022 0.223 2.235
ment (n = 3) and error bars represent standard
GeO 2 concentration (mg L− 1) GeO 2 concentration (mg L− 1) deviations.
Fresh weight (FW)-based contents of chlorophyll a (Chl a), chlorophyll b (Chl b), total chlorophylls (Chl a + b) and the Chl a -to- b ratio (Chl a / b). Data are means ± standard deviations of three replicates per treatment (n = 3). Different lowercase letters behind the data in each column indicate statistically significant differences of the pigments between the GeO 2 concentrations (P <0.001, 1-way ANOVA, Tukey-Kramer HSD post-hoc test).
concentrations tested between 0.022 and 2.235 mg l −1 (Figure 3). In addition, the contents of Chl a and Chl b in U. fenestrata remained unaffected by the presence of different GeO 2 concentrations in the seawater (Table 1). However, there was slight decrease in the Chl a / b ratio of U. fenestrata from 1.61 ± 0.08 in the control by 10 – 15 % in the presence of GeO 2 (P = 0.0208, 1-way ANOVA; Table 1).
In the large-scale experiment, the RGR, all three photosynthetic parameters, and the chlorophyll contents, including the Chl a / b ratio of U. fenestrata, were statistically similar between the control and the two tested GeO 2 concentrations after 14 days of cultivation (Figure 4 and Table 1). However, the addition of GeO 2 to the seawater decreased the density of F. oceanica on the wall surfaces of the Plexiglass water tanks by 36 – 43 % at 0.223 – 2.235 mg GeO 2 l −1 compared to the control (P = 0.0077, 1-way ANOVA; Figure 5).
description: Published as part of Rautenberger, Ralf, 2024, Germanium dioxide as agent to control the biofouling diatom Fragilariopsis oceanica for the cultivation of Ulva fenestrata (Chlorophyta), pp. 93-100 in Botanica Marina (Warsaw, Poland) (Warsaw, Poland) 67 (2) on pages 95-96, DOI: 10.1515/bot-2023-0075, http://zenodo.org/record/11360456