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

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Figure 4.3 Time spent outside of a den (mean ± SE) in a day for male (open circles)
and female (filled circles) North American porcupines and occurrence of feeding
behaviour (mean ± SE) wh en in a coniferous tree (filled squares: males and females
pooled since difference between sexes was not significant) as a function of operative
temperature, Parc National du Bic, Québec, January to April, 2004-2005. Sample
sizes are specified near each symbol as: number of individuals, number of
observations on those individuals. 70
Figure 4.4 Estimated time spent feeding (mean ± SE) in a day for male (white bars)
and female (dark bars) North American porcupines, Parc National du Bic, Québec,
January to April, 2004-2005. Time spent feeding was estimated for each individual and
c1ass of operative tempe rature (Te) and then averaged for males and females for each
class of Tc.
73
Chapitre 5
Figure 5.1 Characteristics of microhabitats measured within 1 m of hiding sites used
by 14 juvenile North American porcupines, and at random locations in Parc National du
Bic, Québec, May to August, 2003-2004. Results shown are means (± SE) for the
population (calculated from individual means). a) Proportion ofhiding sites that were in a
den (/10), proportion of protective co ver (/10) around hiding sites, air temperature (oC),
and wind speed (cm/s) in the microhabitat (n = 14 individuals and 299 observations for ail
variables). b) Percentage oftimes the tree used was an aspen, fruit-bearing, other
deciduous, cedar, or other coniferous tree Bars to the right show mean circumference
(cm) of the tree (n = 10 individuals and 73 observations for aU variables). 93