Abstract
International and national protection strategies and directives focus mainly on macroscopic organism and attempt to maintain their endangered habitats. However, microscopic communities are also threatened by decreasing biodiversity and many species including freshwater algae can disappear without even knowing they were present in the habitat. Defining rarity of microscopic taxa is not easy. The species’ rarity is based on detailed knowledge of distribution and abundance of species. But only limited information is available about rare algal species especially in a given ecoregion. Reducing the data gaps, here, we present altogether 20 phytoplankton taxa rare in Hungary: three species of Chlorophyceae, eight species of Trebouxiophyceae, two taxa of Euglenophyceae, one-one species of Cyanobacteria, Bacillariophyceae and Mediophyceae and three species of Xanthophyceae. One of them, the Cylindrotheca gracilis is on the Hungarian Red List. Physical and ecological characteristics of standing waters where these species were found as well as their former occurrence all over the world are also reviewed.
Highlights
The quest to understand how the world can work always presents new challenges for researchers
The Cylindrotheca gracilis (Brébisson ex Kützing) Grunow is on the Hungarian Red List
Ecological data: We found this species in a gravel pit lake with a few individuals. This species is listed into the Vulnerable (VU) category based on the Hungarian Red List of Algae (Németh 2005)
Summary
The quest to understand how the world can work always presents new challenges for researchers. Tasks had to be solved were under significant social pressure. From the middle part of the twentieth, eutrophication has been become the one of the most important tackled tasks both in local and global scales (Reynolds 2006). The surplus nutrient supply, mainly phosphorus and nitrogen, can cause undesirable changes in water quality (Istvánovics 2009). Eutrophication can modify the dynamics of phytoplankton with increasing algal biomass and blooming cyanobacteria resulting alteration in the species composition (Reynolds 2006). The drastic changes of climate, primarily hydrological drought or flash floods, cause deterioration of the quantity and quality of surface waters (Murdoch et al 2000, Mosley 2015). The structure of communities living here is significantly changed by the decreasing water
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