. The Canadian field-naturalist. 2000 Notes 497 550 500- 450- 400-. 350 'i I I I I I I I I I I I M I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I' ,-, <Ti ooi/i CO f\i r-<T) r^ CO cj ooin ID »o t^ 00 a>'ârvi CO in il> t~- â âCO h-O oj 00 o'^ JH.â1â.ââ â.â.âOOOOO"ââ¢âPJ'vJCJtNlcvjtvioJroroeocorococooorocoOOOOOOO'ââ¢ââ¢â(vJtvitvirorr) l_l_l-JâIâJâJâIâIâiâIâIâiâJâI {^ days of periods Figure 2. Body weight changes in one squirrel in pregnancy and lactation: PB n: the n days before pregn
. The Canadian field-naturalist. 2000 Notes 497 550 500- 450- 400-. 350 'i I I I I I I I I I I I M I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I' ,-, <Ti ooi/i CO f\i r-<T) r^ CO cj ooin ID »o t^ 00 a>'ârvi CO in il> t~- â âCO h-O oj 00 o'^ JH.â1â.ââ â.â.âOOOOO"ââ¢âPJ'vJCJtNlcvjtvioJroroeocorococooorocoOOOOOOO'ââ¢ââ¢â(vJtvitvirorr) l_l_l-JâIâJâJâIâIâiâIâIâiâJâI {^ days of periods Figure 2. Body weight changes in one squirrel in pregnancy and lactation: PB n: the n days before pregnancy; P n: the n days of pregnancy; L n: the n days of lactation; *: female mean body weight on that day. Literature Cited Gurnell, J. 1987. The Natural History of Squirrels. Christopher Helm, London, 201 pages. Ha vera, S. P. 1979. Energy and nutrient cost of lactation in fox squirrels. Journal of Wildlife Management 43: 958-965. Kaczmarski, F. 1966. Bioenergetics of pregnancy and lac- tation in the bank vole. Acta Theriologica 19: 409-417. Knee, C. 1983. Squirrel energetics. Mammal Review 13: 113-122. Loveridge, G. G. 1986. Body weight changes and energy intake of cats during gestation and lactation. Animal Technology 37: 7-15. Myers, P., and L. L. Master. 1983. Reproduction by Peromyscus maniculatus: size and compromise. Journal of Mammalogy 64: 1-18. Prado, M. D., G. Delgado, and S. Villalpando. 1997. Maternal lipid intake during pregnancy and lactation alters milk composition and production and litter growth in rats. Journal of Nutrition 127: 458^62. Sauer, J. R., and N. A. Slade. 1986. Size-dependent pop- ulation dynamics of Microtus ochrogaster. The American Naturahst 127: 902-908. Short, H. L., and W. B. Duke. 1971. Seasonal food con- sumption and body weights of captive tree squirrels. Journal of Wildlife Management 35: 436^39. Smith, C. C. 1968. The adaptive nature of social organi- zation in the genus of tree squirrel Tamiasciurus. E
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