Exudates from Gracilaria chilensis stimulate settlement of epiphytic ulvoids |
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Authors: | Santelices B Varela D |
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Institution: | (1) Institute of Freshwater Biology, Polish Academy of Sciences, Sawkowska 17, 31-016 Kraków, Poland;(2) Institute of Botany, Jagiellonian University, Lubicz 46, 31-512 Kraków, Poland |
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Abstract: | In the diatom communities of the Vanishing and Ornithologist Creek 74 taxa were found. Most of the taxa have a cosmopolitan range and are resistant to various environmental stresses. For example, Achnanthes lanceolata var. lanceolata, is found in all types of waters and in several ecological conditions. Achnanthes delicatula ssp. delicatula, Nitzschia frustulum, N. capitellata, Navicula mutica, and N. gregaria develop both in fresh and brackish waters. Some of the organisms also settle in terrestrial environments. Navicula atomus, N. mutica, Pinnularia borealis, and Hantzschia amphioxys are common soil algae. Navicula digitulus, N. contenta, N. cohnii and Achnanthes coarctata also live in an aerial environment. Navicula atomus is well developed in eutrophic waters and Nitzschia capitellata can tolerate a high level of pollution, while Nitzschia gracilis, Fragilaria capucina, and F. alpestris appear both in oligotrophic, and enriched waters. Stenotopic ecological features are shown by Achnanthes marginulata and Navicula digitulus — known from the Alps and the North, and Navicula muticopsis characteristic for Antarctic and Subantarctic.The index of diatom biomass, usually of low and medium value, was highest in the area of possible impact by a penguin colony. |
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Keywords: | Antarctica King George Island Arctowski Station stream diatoms taxonomy ecology |
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