Browsing NIVA Open Access Archive by Author "Nowak, Petra"
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Charophytes in warm springs on Svalbard (Spitsbergen): DNA barcoding identifies Chara aspera and Chara canescens with unusual morphological traits
Langangen, Anders; Ballot, Andreas; Nowak, Petra; Schneider, Susanne C (Peer reviewed; Journal article, 2019)The Troll springs are warm springs on Svalbard (Spitsbergen). Charophytes were collected in the years 1910, 1912, 1958, 1992/1993, and 2018. However, since the Chara samples showed unusual morphological traits, there were ... -
Genetic and morphological variation in Chara contraria and a taxon morphologically resembling Chara connivens
Trbojević, Ivana; Marković, Aleksandra; Blaženčić, Jelena; Subakov Simić, Gordana; Nowak, Petra; Ballot, Andreas; Schneider, Susanne Claudia (Peer reviewed; Journal article, 2020)Charophyte species delineation is regularly based on a set of thallus morphological characteristics, but considering pronounced phenotypic plasticity, difficulties and doubts commonly occur in Chara species determination. ... -
Plastid DNA sequences and oospore characters of some European taxa of Tolypella section Tolypella (Characeae) identify five clusters, including one new cryptic Tolypella taxon from Sardinia, but they do not coincide with current morphological descriptions
Holzhausen, Anja; Nowak, Petra; Ballot, Andreas; Becker, Ralf; Gebert, Jasmina; Gregor, Thomas; Karol, Kenneth G.; Raabe, Uwe; Schneider, Susanne Claudia; Stewart, Nick; Van de Weyer, Klaus; Wilde, Volker; Schubert, Hendrik (Peer reviewed; Journal article, 2023)In Europe, the genus Tolypella (Characeae) comprises four to eight Tolypella taxa in sections Rothia and Tolypella that have been distinguished by vegetative morphology and gametangial characters such as antheridial size ... -
Species differentiation in the genus Chara (Charophyceae): considerable phenotypic plasticity occurs within homogenous genetic groups
Schneider, Susanne C.; Nowak, Petra; Von Ammon, Ulla; Ballot, Andreas (Journal article; Peer reviewed, 2016)Charophytes are benthic algae with a complex morphology and high phenotypic plasticity. This has led to ambiguities in species delineation. However, until now genetic studies on Chara have been based on samples collected ...