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The race for reaching mates by the time they are receptive, or sexual selection by scramble competition, has received little attention. We argue that smaller males are favored in species in which the male must climb to reach females located in high habitat patches. This new explanation we term the "gravity hypothesis" of sexual size dimorphism (SSD). We(More)
Cover photos. Monitoring wildlife, rare plants, and their habitats is conveyed through three photos: (1) Peromyscus maniculatus, on Pesola scale (photo credit: Dean E. Pearson); (2) western prairie fringed orchid (Platanthera praeclara) (photo credit: Carolyn Hull Sieg); and (3) measuring a ponderosa pine (Pinus ponderosa) log in Idaho (photo credit:(More)
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