AA.VV., - American Naturalist 1975, Vol

1975. 109 issue 968 "Letters to the editors" pp. 465-490, In 8vo, offp., pp. 23 - Contains these papers: Batzli GO, Pitelka FA. - Vole cycles: test of another hypothesis; Charlesworth D, Charlesworth B. - Sexual selection and polymorphism; Emlen JM. - Niches and genes: some further thoughts; Gadgil M, Taylor CE. - Plausible models of sexual selection and polymorphism; Kulesza G. - Comment on "niche, habitat, and ecotype"; Whittaker RH, Levin SA, Root RB. -. On the reasons for distinguishing "niche, habitat, and ecotype".

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