naa a22 4500 51075208X CHVBK 20180411083108.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11270-013-1563-8 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1563-8 The Presence of Nitrates and the Impact of Ultraviolet Radiation as Factors that Determine Nitrate Reductase Activity and Nitrogen Concentrations in Deschampsia antarctica Desv. Around Penguin Rookeries on King George Island, Maritime Antarctica [Elektronische Daten] [Marek Krywult, Jerzy Smykla, Adam Wincenciak] Plant communities around penguin rookeries were studied during the Antarctic summer. Antarctic hair grass Deschampsia antarctica was examined. The abundance of this grass around penguin rookeries demonstrated a characteristic distribution. Eight UV screens were installed on a transect leading away from the rookeries. Nitrate reductase activity was measured below and outside of the screens. The activity varied between the measurement sites and also changed with the distance from rookeries. Fifteen cycles of nitrate reductase activity were conducted during the experiment. The highest values of nitrate reductase in the leaves of plants protected from UV radiation, which occurred in well-fertilized sites close to the rookery, reached 743.1 (SD = 789.7) nmol of nitrite synthesizedg−1 of dry massh−1; the lowest occurred in the poorly fertilized sites 77.2 (SD = 41.2) nmolg−1 of dry massh−1. Nitrate reductase activity in unprotected plants growing in ambient conditions reached up to 843.8 (SD = 894.5) in well-fertilized sites and 159.5 (SD = 257.6) nmolg−1 of dry massh−1, respectively. The greatest abundance of D. antarctica occurred in the middle of the transect. The influence of ultraviolet radiation caused the induction of NR activity in poorly fertilized sites, but this effect was not visible in sites that were well fertilized. Total nitrogen concentrations in the plant tissues varied between 1.4% in poor sites and 3.4% in sites that were situated close to the rookeries. In addition, the concentrations of total nitrogen in the soil varied between the sites and ranged from 0.2 to 3.3%. Springer Science+Business Media Dordrecht, 2013 Nitrate reductase activity nationallicence Ultraviolet radiation nationallicence Deschampsia antarctica nationallicence King George Island nationallicence Maritime Antarctic nationallicence Krywult Marek Institute of Environmental Protection and Engineering, University of Bielsko-Biała, Willowa 2, 43-309, Bielsko-Biała, Poland aut Smykla Jerzy Department of Biodiversity, Institute of Nature Conservation, Polish Academy of Sciences, Mickiewicza 33, 31-120, Kraków, Poland aut Wincenciak Adam Department of Plant Ecology and Nature Protection, Institute of Ecology and Environmental Protection, Nicolaus Copernicus University, Gagarina 9, 87-100, Toruń, Poland aut Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-12 0049-6979 224:5<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1563-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1563-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Krywult Marek Institute of Environmental Protection and Engineering, University of Bielsko-Biała, Willowa 2, 43-309, Bielsko-Biała, Poland aut NATIONALLICENCE 700 1- Smykla Jerzy Department of Biodiversity, Institute of Nature Conservation, Polish Academy of Sciences, Mickiewicza 33, 31-120, Kraków, Poland aut NATIONALLICENCE 700 1- Wincenciak Adam Department of Plant Ecology and Nature Protection, Institute of Ecology and Environmental Protection, Nicolaus Copernicus University, Gagarina 9, 87-100, Toruń, Poland aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-12 0049-6979 224:5<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer