-(Desmid flora (Zygnemaphyceae, Desmidiales) of the Cascavel River, Western Paraná State, Brazil). This study aimed to perform the taxonomic survey of desmids of an important lotic ecosystem in the western region of Paraná State. Samples were collected monthly (July 2010 to June 2011), in three sampling stations from the Cascavel River, resulting in the identification of 60 taxa, belonging to 10 genera. The Cosmarium Corda ex Ralfs (29) and Closterium Nitzsch ex Ralfs (10) obtained the largest number of inventoried species. A total of 14 new citations were recorded for the Paraná State, distributed among genera Actinotaenium (Nägeli) Teiling (2), Cosmarium (7), Closterium (1), Micrasterias C. Agardh ex Ralfs (1), Pleurotaenium Nägeli (1), Staurastrum Meyen (1) and Staurodesmus Teiling (1). At the end of the study was observed that the total number of species identified, 83.9% were common to all three stations collected, 13.3% were recorded in the sampling stations 2 and 3, and 3.3% only at station 3.
This study aimed to document the Cosmarium (Desmiadiales, Zygnematophyceae) taxa at a subtropical stream located in an area adjacent to the Iguaçu National Park, an important environmental protection area in the further west of Paraná State. For this purpose, monthly samplings of periphytic material associated to Eleocharis minima Kunth were performed in the period of August 2012 to July 2013. This taxonomic inventory allowed the identification of 37 taxa at specific and infra-specific levels. There were 15 new records for Paraná State: Cosmarium bipunctatum Börgensen, C. clepsydra Nordstedt var. bicardia (Reinsch) Croasdale, C. crenatum var. crenatum Ralfs, C. difficile Lütkemüller var. dilatatum Borge, C. isthmochondrum var. isthmochondrum Nordstedt, C.obsoletum (Hantzsch) Reinsch var. obsoletum, C. ordinatum (Borge) West & West var. ordinatum, C.ornatum Ralfs var. ornatum f. ornatum, C. pseudoconnatum Nordstedt var. pluriradians Scott & Grönblad, C. pseudoretusum F. Ducell. var. pseudoretusum Krieger et Gerlof, C. pyramidatum var. borgei Krieger & Gerloff, C. regnellii var. minimum Eichler & Gutwinski, C. repandum var. minus (West & West) Krieger & Gerloff, C. securiforme Borge var. brasiliense Grönblad and C. variolatum var. variolatum Lundell.
-(Chlorococcales sensu latu (Chlorophyceae) from a subtropical lotic ecosystem, Paraná State, Brazil). This study aimed to perform the taxonomic survey of Chlorococcales from Cascavel River, municipality of Cascavel, Paraná State, Brazil. Samples of the biological material (periphytic, metaphytic and phytoplanktonic) were collected monthly from July 2010 to June 2011, in three sampling stations along of the river. This paper resulted in the identification of 30 taxa, belonging to 16 genera (Desmodesmus (8) and Pediastrum (4) were the ones that presented the largest number of species) and six taxonomic families. A total of five new citations were recorded for the Paraná State: Chlorotetraedron incus (Teiling) Kom, Desmodesmus pseudodenticulatus (Hegew.) Hegew., Dictyosphaerium chlorelloides (Naum.) Kom. & Perm., Oocystis marssonii Lemm. and Pediastrum duplex var. gracillimum West & G.S. West.
Aim: The aim of this study was to assess the taxonomic aspects and geographical distribution of the periphytic desmids from two different substrates in the littoral zone of an urban artificial lake. Methods Samples of epiphytic and epilithic desmids were collected by grass and rock scraping, respectively, in two stations in the Cascavel municipal lake, Paraná, during April 2015, and March 2016 and 2017. In the laboratory, the taxa obtained from the samples were photographed and their morphometric characteristics recorded. The species composition of the desmid was characterized, and the frequency of occurrence as well as the geographic distribution of each taxon in the Paraná State were recorded. Results We identified 35 taxa, distributed in 10 genera. The most representative were Closterium Nitzsch ex Ralfs and Cosmarium Corda ex Ralfs. A high occurrence of sporadic taxa (60%) was observed and among the recorded taxa, the most frequent were Cosmarium pseudoconnatum Nordstedt var. pseudoconnatum and Desmidium grevillei (Kützing ex Ralfs) De Bary. Nine taxa were exclusive to the epilithic substrate and only Netrium digitus (Ralfs) Itzigsohn & Rothe var. digitus was exclusive to the epiphytic substrate, while the remaining 25 taxa occurred in both substrates. Seven taxa are new records for the Paraná State. Conclusion Although our results are of qualitative nature, they provide baseline data on the biogeographic distribution of taxa, which are crucial for future taxonomic and ecological studies that might contribute to the preservation of the biodiversity.
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