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absorption Acta age-classes algae animals assimilation biomass biosynthesis calculated Calendula officinalis Carabidae carotenoids cells changes chlorophyll chloroplasts coefficient compounds concentration crop-fields cultivation culture dark debarking decrease density dipterans dormancy dry matter ecol Ecological ecosystems effect electron transport embryos endogenous energy transfer enzymes estimation European bison factors fluorescence forest fraction glucose glycosides green algae growth higher hornbeam illumination increase influence inhibition investigations isolated KASPRZYK laboratory leaf leaves light conditions light intensity measurements mechanism medium metabolism method moose nitrogen obtained oleanolic acid organisms oxygen period photorespiration photosynthesis photosynthetic activity photosynthetic apparatus photosynthetic production Physiol pigments plants population potato fields processes protein radioactivity red deer respiration roe deer rye field samples Scenedesmus shoots SKRZYPCZYK soil species spiders Spirulina sterols structure studies sunflower synthesis temperature terpenoids Tilia cordata tion trees triterpene unicellular wild boars winter ZURZYCKI