Experimental tests of food limitation

1
Experimental tests offood limitation

• Individual as the experimental unit

Becker et al. 1998. Oikos 8181-92
Larsen et al. 1997. J. Mamm. 78192-203
Boutin Larsen 1993 J.Anim.Ecol.
78192-203
2
The effects of food supplementation on winter
survival
p0.07
p0.22
3
body mass
p0.79
p0.27
4
parturition date
p0.003
p0.73
5
litter size
p0.14
p0.10
6
weaning success
p0.63
p0.73
7
ReproductiveEnergetics

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

Humphries Boutin 2000 Ecology 812867-77
Humphries Boutin 1999 Can. J. Zool. 77171-73
Humphries Boutin. 1996. J. Anim. Ecol.
65332-338
8
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9
/-/? 2 offspring
Weigh and tag
Maternal behaviour and energetics
10
Juvenile growth
Treatment p0.009 Year plt0.001
11
Maternal behaviour
Treatment p0.54 Year plt0.001
12
Maternal expenditure
Treatment p0.001 Temperature plt0.001
13
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14
Post-weaning Juvenile Survival
Treatment p0.04