Gloiopeltis furcata (Postels & Ruprecht) J. Agardh, a macroalga, which grows in an upper, intertidal zone, can withstand drastic environmental changes caused by the periodic tides. In this study, the photosynthetic and morphological characteristics of G. furcata were investigated. The photosynthetic performance and electron flows of the thalli showed significant variations in response to desiccation and salinity compared with the control group. Both PSII and PSI activities declined gradually when the thalli were under stress. However, the electron transport rate of PSI showed still a low value during severe conditions, while the rate of PSII approached zero. Furthermore, PSI activity of the treated thalli recovered faster than PSII after being submerged in seawater. Even though the linear electron flow was inhibited by DCMU [3-(3, 4-dichlorophenyl)-1,1-dimethylurea], the cyclic electron flow could still be restored. The rate of cyclic electron flow recovery declined with the increasing time of dark treatment, which suggested that stromal reductants from starch degradation played an important role in the donation of electrons to PSI. This study demonstrated that PSII was more sensitive than PSI to desiccation and salinity in G. furcata and that the cyclic electron flow around PSI played a significant physiological role. In addition, G. furcata had branches, which were hollow inside and contained considerable quantities of funoran. These might be the most important factors in allowing G. furcata to adapt to adverse intertidal environments., L. Huan, S. Gao, X. J. Xie, W. R. Tao, G. H. Pan, B. Y. Zhang, J. F. Niu, A. P. Lin, L. W. He, G. C. Wang., and Obsahuje bibliografii
Traditionally, all freshwater representatives of red algae with uniaxial cartilagineous and pseudoparenchymatous thalli were placed in the genus Lemanea. Two subgenera of this genus were distinguished, Lemanea and Paralemanea. The recently proposed elevation of these subgenera to genera is fully justified and generally accepted. However, the increasing data from natural populations of Lemanea shows that not all the traditional diacritical features are reliable for distinguishing species. This paper presents the results of a research project on the morphological variability of Lemanea in the Czech Republic. Of the four species Lemanea fluviatilis and L. torulosa appear to be well-defined but there are no clear differences between Paralemanea annulata and P. catenata. A survey of taxa and key to species are presented.
Zástupci rodu Compsopogon (Rhodophyta) jsou tropické druhy řas. Ve střední Evropě se nacházejí v akváriích a v tocích, ovlivněných vypouštěním oteplených odpadních vod. Druh Compsopogon aeruginosus byl nalezen v rakouském přítoku řeky Dyje Pulkavě. Od prvního nálezu v roce 2007 se tato ruducha šířila i do řeky Dyje. V červnu 2012 byla nalezena ve Skryjském potoce, který přivádí odpadní vody z jaderné elektrárny Dukovany. Odpadní voda v době nálezu měla průměrnou roční teplotu 22,8°C, pH 8,5., The representatives of the genus Compsopogon (Rhodophyta) are basically tropical algae. In Central Europe, they are only found in aquaria and in water bodies affected by thermal effluents. The species Compsopogon aeruginosus was found in the Pulkau River (Austria), a tributary of the Thaya. After the first observation of this species in 2007, it also expanded to the Thaya. In June 2012 it was found in the Skryjský stream which is fed waste water from the Dukovany nuclear power station. At the time of this finding, the waste water had an annual average temperature of 22.8°C, pH 8.5., and Pavel Sedláček, Zdeňka Žáková, Hana Mlejnková.