Matsalolin tsutsa (musamman kwari) da tsire-tsire suna da mahimmanci ga ilimin halittu na kiyayewa. A matsayin mycorrhizal symbionts, kuma a matsayin masu lalatawa da sake amfani da su, fungi suna da mahimmanci ga dorewar gandun daji. Darajar kwari a cikin yanayin halittu tana da girma saboda sun fi duk sauran rukunin da ke rayuwa a cikin wadatar nau'in halittu. Ana samun mafi yawan kwayoyin halittu a cikin ƙasa, wanda ke ci gaba da alaƙar kwari a duk faɗin Kanada. Wannan ƙarancin ƙwayoyin cuta na ƙwayoyin cuta yana haifar da raguwar ƙwayoyin cuta (gami da nau'ikan da ke samar da lichen), marasa ƙwayoyin cuta (musamman kwari) da kuma al'ummomin tsire-tsire inda yawancin nau'ikan halittu ke wakiltar yawancin halittu.
sun fi duk sauran kungiyoyin rayuwa a gwargwadon nau'in nau'in nau'i