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Experimental tests of food limitation. Individual as the experimental unit. Becker et al. 1998. Oikos 81:81-92. Larsen et al. 1997. J. Mamm. 78:192-203. Boutin & Larsen 1993 J.Anim.Ecol. 78:192-203. The effects of food supplementation on winter survival…. p=0.07. p=0.22.

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experimental tests of food limitation
Experimental tests offood limitation
  • Individual as the experimental unit

Becker et al. 1998. Oikos

81:81-92

Larsen et al. 1997. J. Mamm.

78:192-203

Boutin & Larsen 1993 J.Anim.Ecol. 78:192-203

body mass
…body mass

p=0.79

p=0.27

parturition date
…parturition date

p=0.003

p=0.73

litter size
…litter size

p=0.14

p=0.10

slide6

…weaning success

p=0.63

p=0.73

reproductiveenergetics
ReproductiveEnergetics
  • Natural and experimental variation in litter size
  • Short-term energetic and behavioural consequences
  • Long-term life history consequences

Humphries & Boutin 2000 Ecology 81:2867-77

Humphries & Boutin 1999 Can.J. Zool. 77:171-73

Humphries & Boutin. 1996. J. Anim. Ecol. 65:332-338

slide9

+/-/ 2 offspring

Weigh and tag

Maternal behaviour

and energetics

juvenile growth
Juvenile growth

Treatment p=0.009 Year p<0.001

slide11

Maternal behaviour

Treatment p=0.54 Year p<0.001

slide12

Maternal expenditure

Treatment p=0.001 Temperature p<0.001

slide14

Post-weaning

Juvenile Survival

Treatment p=0.04

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