Characteristics of Wolverine (Gulo gulo) dens in the lowland boreal forest of north-central Alberta

We investigated Wolverine (Gulo gulo) denning ecology in the boreal forest of northern Alberta. During winters 2015/2016 and 2016/2017, we used live traps to capture four female Wolverines and fitted them with global positioning system (GPS) collars programmed to take a location every two hours. We determined reproductive status at capture and GPS location data were used to identify den sites. One female denned in one of the two years, one female denned in two consecutive years, and two females did not den during the study. Seven of the eight Wolverine den sites were in mature or old Black Spruce (Picea mariana) stands, where dens consisted of a hollow, moss-covered mound originating from a partially uplifted root mass caused by a leaning or fallen tree. One den was located under decayed logging debris with an overstorey dominated by dense deciduous regeneration. Maximum snow depth recorded (December–March) at weather stations in the study area was 32–51 cm. Spring snow coverage was scarce in our study area (<1%) and always associated with ice cover on lakes and large ponds; mean distance from dens to nearest spring snow coverage was 15.19 km (SD = 2.73, n = 8). Female Wolverines appear to be using locally-available denning structures in the lowland boreal forest, despite a lack of deep snow, persistent spring snow cover, or large boulders documented in other studies.

Nesting trees of the Red Giant Gliding Squirrel Petaurista petaurista (Mammalia: Rodentia: Sciuridae) in a tropical forest of Namdapha National Park, India

The present study investigated the nesting habits of the Red Giant Gliding Squirrel in the tropical forest of Namdapha National Park, India within the time period of 2012–2013. Gliding squirrel nest trees were located by searching for them with using spotlighting during evenings and early mornings. For each den site we recorded data on nesting tree species, total height of tree, height of the nest on tree, tree diameter at breast height (DBH), and canopy connectivity of the nesting tree. We observed P. petaurista using cavity nests (n=27) in eight tree species. The majority of nest trees observed were in Altingia excelsa (40.7%) and Terminalia myriocarpa (22.2%). Trees with less canopy connectivity were preferred for nesting where 59.3% of nest trees had <25% canopy connectivity. Petaurista petaurista nested in trees with an average of 31.1±0.86m (Mean ± SE) height and the nests were located at a mean height of 17.8±0.89m (SE) (min & max: 9.3m & 35.2m). Mean DBH of nesting trees was 70.6±0.98cm (SE) (min & max: 38.2cm & 168.8cm). This data helps in filling the gaps on the denning ecology of the species and may be useful for the management and conservation purpose of forest trees.