Energetic Constraints on Home-Range Size

摘要: McNab (1963) plotted home-range size (HR) against body weight (BW) for a variety of mammal species, and concluded that was determined by an animal's energetic needs the density available food. Using regression model, he fitted allometric relationship form HR = * BWb. The value exponent (b) close to 0.75, which relates basal metabolic rate (Kleiber 1961). also divided species in his sample into two dietetic categories, "hunters" "croppers," showed coefficient (a) higher among hunters, finding attributed relatively low their preferred food items. Since then, similar relationships have been revealed other taxa (lizards: Turner et al. 1969; birds: Schoener 1968; Armstrong 1965; mammalian carnivores: Gittleman Harvey 1982; primates: Milton May 1976; Clutton-Brock 1977; 1981; mammals general: Harestad Bunnell 1979) where variation both b noted. In particular, exponents tend be than originally documented. Jenkins (1981) has recently summarized some these data attempt compare scaling on various bird taxa. However, simple comparison may rather uninformative since correlations most are weak, confidence limits slopes therefore wide. If, as suggested, is energy needs, then consistent differences requirements similar-sized birds should lead groups. this paper, rate, size, dietary from used address following questions: (1) Does between daily expenditure differ mammals? (2) directly determine size?