Abstract
This study, carried out in 2010–11, focuses on species composition and distribution of cyanobacterial and algal communities colonizing ten caves (Biała, Ciemna, Koziarnia, Krakowska, Łokietka, Okopy Wielka Dolna, Sąspowska, Sypialnia, Zbójecka and Złodziejska Caves) in the Ojców National Park (South Poland). A total of 85 taxa were identified, 35 of them belonging to cyanobacteria, 30 chlorophytes, and 20 belonging to other groups of algae. Aerophytic cyanobacteria dominated in these calcareous habitats. Nine species, <em>Gloeocapsa alpina, Nostoc commune, Chlorella vulgaris, Dilabifilum arthopyreniae, Klebsormidium flaccidum, Muriella decolor, Neocystis subglobosa, </em>and <em>Orthoseira roseana</em>, were the most abundant taxa in all the caves. The investigated microhabitats offer relatively stable microclimatic conditions and are likely to be responsible for the observed vertical distribution of aerophytic cyanobacteria and algae.
Highlights
Caves are unique in terms of specific natural characteristics such as: microclimate, temperature, humidity and others
The aim of this study was to present the spatial distribution of aerophytic algae and cyanobacteria growing in ten caves in the Ojców National Park differing in location, morphology and environmental conditions as part of an extensive study of caves in the Polish Jura
A total of 85 aerophytic algae and cyanobacteria species were identified in the ten caves in the Ojców National Park (Fig. 2; Table 2)
Summary
Caves are unique in terms of specific natural characteristics such as: microclimate, temperature, humidity and others. According to Lamprinou et al (2012), a typical cave is described as having three major habitat zones based on light penetration and intensity: the entrance-, transition-, and dim light zone Cave characteristics, such as dimensions, morphology, location, orientation and rocky substrate, can play an important role for the biocommunity structure. Algae often play a key role in the food webs and in the colonization processes of rocky habitats (sediments, rocky surfaces, artificial material) as well as they produce colourful effects on the caves walls (Golubič , 1967). These processes are favoured by usually stable environmental conditions prevailing in caves. Aerophytic algae and cyanobacteria are usually observed in cave entrances illuminated by direct or indirect sunlight and around the artificial light in caves that are open to tourists (Pentecost , 1992; Mulec , 2005; Mulec et al 2008; Czerwik - Marcinkowska and Mrozińska , 2011)
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