title: Daylength as a factor decisive for the possibility of the existence of a species.
authors.forename: N N
authors.initials: NN
authors.lastname: KONSTANTINOV
mesh_terms: D019369:Life; D008027:Light; D018462:Photobiology; D012621:Seasons; D013045:Species Specificity
keywords: LIFE; LIGHT/biological effects; SPECIES