Explanipedia

Broadcasting American red squirrel vocalizations influences detection probability Open

Ian G. Warkentin, Heather E. Spicer, Jenna P. B. McDermott, Darroch M. Whitaker, Erin E. Fraser · 2025

Territorial responses by North American red squirrels ( Tamiasciurus hudsonicus ) to conspecifics vary seasonally with peaks during mating and dispersal periods. Broadcast of squirrel vocalizations during surveys may elicit territorial def…

Associations between elevation, introduced red squirrels, and boreal bird distributions on Newfoundland Open

Ian G. Warkentin, Jenna P. B. McDermott, Darroch M. Whitaker · 2025

Elevational gradients in boreal forest songbird assemblages have received limited attention but may have important conservation implications in the face of climate change–induced habitat alteration and shifts in predator communities. Red s…

Change in altitudinal distribution of Newfoundland Gray-cheeked Thrush ( Catharus minimus minimus ) revealed through historical stop-level breeding bird survey data Open

Gabrielle Robineau-Charette, Darroch M. Whitaker, Ian G. Warkentin · 2023

Breeding bird survey (BBS) data are typically analyzed at the route level in which the average or combined total number of individuals across the 50 stops is treated as a single observation. However, analysis at the stop level may provide …

Spatial segregation between Gray-cheeked Thrush and an introduced nest predator in a managed forest landscape Open

Jenna P. B. McDermott, Darroch M. Whitaker, Ian G. Warkentin · 2023

Introduced species are known for inducing changes in ecosystems and for their impacts on endemic island species. North American red squirrels ( Tamiasciurus hudsonicus ) were introduced to Newfoundland, Canada, during the 1960s and have be…

Assessment of Rusty Blackbird Habitat Occupancy in the Long Range Mountains of Newfoundland, Canada Using Forest Inventory Data Open

Kathleen K. E. Manson, Jenna P. B. McDermott, Luke L. Powell, Darroch M. Whitaker, Ian G. Warkentin · 2020

Rusty blackbirds (Euphagus carolinus), once common across their boreal breeding distribution, have undergone steep, range-wide population declines. Newfoundland is home to what has been described as one of just two known subspecies (E. c. …

Constraints on range expansion of introduced red squirrels (<i>Tamiasciurus hudsonicus</i>) in an island ecosystem Open

Jenna P. B. McDermott, Darroch M. Whitaker, Ian G. Warkentin · 2020

Factors that limit the range expansion of introduced species can offer insights into the basic ecology of these species and inform conservation of associated endemic species. North American red squirrels (Tamiasciurus hudsonicus (Erxleben,…

Fine spatial-scale variation in scavenger activity influences avian mortality assessments on a boreal island Open

Megan J. Clarke, Erin E. Fraser, Ian G. Warkentin · 2020

Bird-window collisions are the second leading cause of human-related avian mortality for songbirds in Canada. Our ability to accurately estimate the number of fatalities caused by window collisions is affected by several biases, including …

Genetic structure and biogeographic history of the Bicknell’s Thrush/ Gray-cheeked Thrush species complex Open

Alyssa M. FitzGerald, Jason T. Weir, Joel Ralston, Ian G. Warkentin, Darroch M. Whitaker , et al. · 2019

We examined species limits, admixture, and genetic structure among populations in the Bicknell’s Thrush (Catharus bicknelli)–Gray-cheeked Thrush (C. minimus) species complex to establish the geographic and temporal context of speciation in…

Fall and Winter Movements of Newfoundland Graycheeked Thrushes (Catharus Minimus Minimus) Open

Darroch M. Whitaker, Ian G. Warkentin, Keith A. Hobson, Peter Thomas, Rinchen Boardman · 2018

The Newfoundland subspecies of Gray-cheeked Thrush (Catharus minimus minimus) has declined since the 1980s and degradation of winter habitat has been suggested as a contributing stressor. However, the winter range of this subspecies is not…

Taxonomy and distribution of the imperilled Newfoundland Gray-cheeked Thrush, Catharus minimus minimus Open

Alyssa M. FitzGerald, Darroch M. Whitaker, Joel Ralston, Jeremy J. Kirchman, Ian G. Warkentin · 2017

Gray-cheeked Thrushes breeding on Newfoundland are purported to be a distinct subspecies (Catharus minimus minimus) and have declined precipitously since the 1980s. To assess the validity of Gray-cheeked Thrush subspecies we collected bloo…

Testing a Habitat Suitability Index Model for Boreal Owls in Western Newfoundland, Canada Open

Kathrin J. Munro, Ian G. Warkentin, Christine M. Doucet · 2016

Boreal Owls (Aegolius funereus) rely on mature forests and, consequently, are negatively affected by timber harvesting strategies that alter the composition and structure of these forests. We tested an existing Boreal Owl habitat suitabili…

Life span and reproductive cost explain interspecific variation in the optimal onset of reproduction Open

Emeline Mourocq, Pierre Bize, Sandra Bouwhuis, Russell Bradley, Anne Charmantier , et al. · 2016

Fitness can be profoundly influenced by the age at first reproduction (AFR), but to date the AFR-fitness relationship only has been investigated intraspecifically. Here, we investigated the relationship between AFR and average lifetime rep…

Gray-cheeked Thrush (Catharus minimus minimus) distribution and habitat use in a montane forest landscape of western Newfoundland, Canada Open

Darroch M. Whitaker, Philip D. Taylor, Ian G. Warkentin · 2015

Once abundant, the Newfoundland Gray-cheeked Thrush (Catharus minimus minimus) has declined by as much as 95% since 1975. Underlying cause(s) of this population collapse are not known, although hypotheses include loss of winter habitat and…

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