influence du climat et de la prédation sur l'utilisation de l'habitat et la ...

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den also increased with wind intensity (Table 5.2, F (I ,284) = 5.11 , P = 0.025), and with
decreasing rain intensity in the last 12 hours (Table 5.2, F ( I,284) = 4.21, P = 0.041).
Outside of the den, juveniles decreased the amount of coyer used as Julian date increased
(F(J ,135) = 9.79, P = 0.002) and with increasing rain intensity in the last 12 hours (Table 5.2,
F (J ,135 ) = 5.35, P = 0.022). There was no effect oftemperature (F(I , 134) = 1.23, P = 0.270) or of
wind intensity (F(J ,135) = 0.20, P = 0.653) on the amount of co ver used (Table 5.2).
Table 5.2 : Use of den (% of locations in den) and use of co ver wh en outside of the den
(mean % of protective coyer) as a function of meteorological conditions for 14 juvenile North
American porcupines in Parc National du Bic, Québec, May to August, 2003-2004. We
considered wind to be present when tree leaves were agitated and rain to be present wh en at
least a light rain was fa lling (see methods). Sample sizes (N) represent number of individuals
and number of observations
Use of den
Use ofcover
Mean ± SE N Mean ± SE N
Air temperature
> 15°C 61 ± 10 12, 65 68 ± 7 9, 21
15-19°C 54 ± 7 13 , 106 55 ± 6 12, 50
20-24°C 42 ± 12 10, 105 63 ± 4 9, 63
2:25 °C 27 ± Il 8, 23 70 ± 9 8, 16
Wind
No wind 61 ± 8 13, 112 63 ± 4 11 , 47
Wind 45 ± 6 13, 187 61 ± 5 13 , 103
Rain in the last 12 h
No rain 50 ± 8 13, 192 68 ± 5 12, 103
Rain 55 ± 9 14, 107 56 ± 6 12, 47
Individua/ indicators of habitat use
We foundjuveniles inside dens, on the ground, and in a tree 47%, 26% and 27% of the
times we located them, respectively. lndividuals significantly differed in their use of den,
tree, and ground locations (Table 5.3). On average, juveniles used microhabitats providing
77% of protective coyer but individuals significantly differed in the me an protective coyer
they used (Table 5.3). The amount of protective coyer was negatively correlated to the air