Vertical stratification patterns of methanotrophs and their genetic controllers in water columns of oxygen-stratified boreal lakes by Rissanen, Antti J. Saarela, Taija Jäntti, Helena Buck, Moritz Peura, Sari Aalto, Sanni L. Ojala, Anne Pumpanen, Jukka Tiirola, Marja Elvert, Marcus Nykänen, Hannu