Ekologia Polska, Volume 19Państwowe Wydawnictwo Naukowe, 1971 - Ecology |
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Common terms and phrases
abundance adult alfalfa amount appeared associations average basis biomass body weight bumble-bees calculated carried caught caused changes collected compared concentration considerable consumption covered crops culture decrease density depending determined diaspore distribution dominant Ecology effect eggs Ekol estimated experiments factors females field forest forms given groups growth habitat higher humidity imagines increase indices individuals influence insects Kazuń lake larvae length lines lower material meadow mean method mites mobility months mortality mycelium natural nematodes nests observed obtained occur Partridges percentage period plants plot Poland population possible predators present production ratio relation relatively resistance samples season shooting similar soil species spiders stage stations Strzeleckie studies temperature tion traps trees values variations Warszawa weight