title: Radial and peripheral clines in northern polymorphic populations of Philaenus spumarius.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D004463:Ecology; D005260:Female; D005387:Finland; D005843:Geography; D006430:Hemiptera; D008297:Male; D009664:Norway; D010641:Phenotype; D011110:Polymorphism, Genetic; D012737:Sex Factors; D013548:Sweden