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

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(1992), we also tested a plastic attachment system (Fig. 2.2) that was made of a 1 mmdiameter
metal wire inserted within Tygon tubing (0.63 xO.95 cm [l/4x3/8 inch], VWR
International, catalogue number 63014-472, Ville Mont-Royal, Que.). We fastened collars
loosely enough to allow animais to gain mass (Berteaux et al. 2005), but tight enough to
prevent loss and reduce chances of an animal getting hung by its collar in a tree. We
attempted to capture, immobilize, and check neck condition of collared porcupines every
three months.
Figure 2.2 : Tygon tubing system used to attach radio transmitter to North American
porcupines in Parc National du Bic, Québec, May 2000-May 2005. Note that the metallic part
(cramp) used to close the collar is visible on the picture but was inserted into the Tygon after
the collar was adjusted around the porcupine's neck. Photo by S. Descamps.
We equipped juveniles captured soon after birth with Holohil VHF transmitters (model
R 1-2DM 7.5 g, Holohil Systems Ltd., Carp, Ont.) mounted on a metal wire inserted within
clear flexible Vinyl tubing (0.31 x0.47 cm [l/8x311 6 inch], United States Plastic Corp.,
catalogue number 5900 l , Lima, OH). We captured and weighed collared juveniles every
week to check mass gain. Juveniles were chemically immobilized after each mass gain of 400
g to verify if size of coll ars needed adjustment. When juveniles reached 3 kg, we changed