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

XI
Figure 2.3 Number oftimes ajuvenile was found through a systematic se arch
around a female North American porcupine in Parc National du Bic, Québec, May 2000
to May 2005, according to a) number of search(es) performed to find the juvenile
(includes the successful search), and b) time spent searching (min) before finding a
juvenile (only data from successful searches are shown).
27
Chapitre 3
Figure 3.1 Standardized yearly solar irradiance, winter precipitation, snowfall and
spring temperature between 1998 and 2004. Solar irradiance was obtained from the
PMOD/WRC (Davos, Switzerland), and weather records from the Environment Canada
weather station at Rimouski, about 20 km from Parc National du Bic, Québec. 42
Figure 3.2 Mean monthly survival probability between August in year t and May
in year t + 1 according to age (white symbols: juveniles; black symbols: individuals
:::: l-yr-old) in a North American porcupine population, Parc National du Bic, Québec,
August 2000-May 2005. Results correspond to estimated values (mean ± SE) from
model selected in table 3.4. Secondary axis shows environmental covariates related
to winter survival: dotted line corresponds to me an solar irradiance (for year t, in W/m 2 ) ,
long-dashed line cOiTesponds to winter precipitation recorded at Rimouski (from
November, year t to April, year t + 1, in mm). 45
Figure 3.3 Causes of mortality determined for carcasses found during monitoring
of a North American porcupine population in Parc National du Bic, Québec,
May 2000-May 2006. Percentage of carcasses dead by starvation, road kill, tree fall and
predation are shown respectively in white, light grey, dark grey and black. Sample sizes
for each year are indicated at the top of each bar. 47