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Published: 2022-01-28
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Cymbopleura amicula stat nov. et. nom. nov. (Bacillariophyceae)—a rare diatom species from a karst river in Croatia

University of Zagreb, Faculty of Science, Department of Biology, Rooseveltov trg 6, 10000 Zagreb, Croatia 2 Institute of Oceanography and Fisheries, Laboratory of Plankton and Shellfish Toxicity, Šetalište I. Meštrovića 63, 21000 Split, Croatia
University of Zagreb, Faculty of Science, Department of Biology, Rooseveltov trg 6, 10000 Zagreb, Croatia
University of Zagreb, Faculty of Science, Department of Biology, Rooseveltov trg 6, 10000 Zagreb, Croatia
Institute of Oceanography and Fisheries, Laboratory of Plankton and Shellfish Toxicity, Šetalište I. Meštrovića 63, 21000 Split, Croatia
The Institute of the Environment, University of León, León, Spain
Institute of Biology, Faculty of Natural Science, Ss Cyril and Methodius University, Skopje, R. North Macedonia
Cymbopleura diatom assemblage freshwater karstic spring zone Krka River Algae

Abstract

The Krka River is located at Balkan Peninsula in the Dinaric region of Croatia and it is a typical groundwater-fed karst river characterized by an unusual phenomenon-tufa. Tufa designates porous CaCO3 deposits forming under specific physical and chemical conditions and hosting very diverse freshwater biota. Karst springs are considered one of the most diverse habitats for diatoms and are usually inhabited by specific diatom assemblages, which include the Krka spring zone. However, such habitats are particularly impacted by human activities, so previous studies have recently been conducted to raise awareness of the importance of karstic spring zones, especially because they are inhabited by specific and rare species. During the research at Krka River, samples were collected in the spring zone in May 2017, and the observations revealed the existence of a one Cymbopleura species characterized by slightly convex to almost linear valves, which are slightly protracted, broadly rounded and weakly dorsally bent at the apices. Based on detailed morphological analyses on light and scanning electron microscopy it appears that this population resembles two previously described taxa: C. rupicola var. minor Krammer and C. rupicola var. korana Krammer. Here we provide a more detailed description of the mentioned population under the new name Cymbopleura amicula stat. nov. et nom. nov. due to the significant differences from C. rupicola, together with a comparison with similar taxa in Cymbopleura.

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