Mutualism is a interaction in which both organisms in a close relationship derive some degree of benefit. Mutualism is usually temporary or not obligatory.
... Kusunai and 37.6° at Aniva (January, 9.5°; July, 60.2°). At Alexandrovsk near Dui the annual range is from 81 in July to -38° in January, while at Rykovsk in the interior ...