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

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Table 3.2 : Structure and size of a NOith American porcupine population followed in Parc
National du Bic, Québec, May 2000-May 2006. Population growth rate was calculated as
j2oj2ulation size in ;iear t+ 1 divided b;i j2oj2ulation size in ;iear t
2000 2001 2002 2003 2004 2005 2006
Juvenile males 7 1 4 3 2 0 0
Juvenile females 2 3 1 3 3 0 0
Subadult males 6 2 2 0 0 0 0
Subadult females 10 3 2 0 2 0 0
Adult males 47 38 27 17 7 1 0
Adult females 45 37 30 21 9 3
Total 117 84 66 44 23 4
Growth rate 0.72 0.79 0.67 0.52 0. 17 0.25
Relationships between solar irradiance and local weather variables
The solar irradiance was negatively correlated with winter precipitation (r = -0. 81, P =
0.027, n = 7) but only marginally with snowfall (r = -0.71, P = 0.076, n = 7) and not at ail
with spring temperature (r = 0.18, P = 0.700, n = 7) (see Fig. 3.1).
2,0 - . - Solar Irradiance 1
1,5
2
(Il
" 1,0
2
s:::
QI
E 0,5
s:::
0
...
tJ,
--Winter precipitation
··0· · Snowfall 1
tJ,
Spring Temperature
>
s:::
0,0
QI
199 2001 .>1002
"
" ...
(Il
"
. ~ ·0,5
s::: ·10
2 ' o.
Cf)
·1 ,5
\ 2003
\
\
\
\
\
.,
2004
, , ,
. 0
, , , , , ,
'.
·2,0
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.