Environmental Science (Biology)
Memorial University of Newfoundland - Grenfell Campus
Corner Brook NL, A2H 6P9
Phone: (709) 637-6246
E-mail: ian.warkentin "at" grenfell.mun.ca
Cognitive and Behavioural Ecology Graduate Program, Memorial University of Newfoundland
Environmental Science Graduate Program, Memorial University of Newfoundland
Specifically, my research investigates how the configuration and composition of landscapes influence the movement and population dynamics of forest birds. Both natural and human-derived fragmenting of habitat can influence where birds settle, how they access the resources they need to survive and reproduce, and these factors in turn affect population demographics. Most recently, I have been studying the ability of individuals to move through and utilize forested areas which have been modified through timber harvest as they seek out resources for the breeding and postfledging phases. As well I am working in collaboration with Parks Canada scientists to examine in the influence of high density moose populations on forest bird communities in Gros Morne National Park. Many of my projects are conducted in collaboration or consultation with representatives of industry and government agencies, seeking to improve the management and sustainability of natural resource extraction.
Previously completed projects:
(1) the factors controlling reproductive success of urban-breeding merlins (Falco columbarius) in Saskatoon, Saskatchewan
(2) habitat use and foraging behavior of songbirds
wintering in Costa Rican mangrove forest
(3) use of riparian forest fragments by Neotropical birds in agricultural landscapes of Chiapas, Mexico
(4) training courses on landbird monitoring in west-central Mexico
(5) impact of cattle grazing on riparian bird communities in Toiyabe National Forest, Nevada
(6) impact of forestry practices in Newfoundland on the breeding biology of northern waterthrush
(7) influence of forest spatial configuration and composition on the capacity of songbirds to move in search of critical resources
(M.Sc. ongoing). .
and Behavioural Ecology), Memorial University of Newfoundland, St. John's NL.
(M.Sc. ongoing).Influence of silviculture and red squirrels on Gray-cheeked Thrush in montane forests
. (Cognitive and Behavioural Ecology), Memorial University of Newfoundland, St. John's NL.
Lauren Rae. 2014. Forest bird communities in Gros Morne National Park and the influence of high moose densities. M.Sc. (Cognitive and Behavioural Ecology), Memorial University of Newfoundland, St. John's NL.
Carlos Vinueza. 2013. Monitoring in protected areas of Guayas, Ecuador. M.E.S. (Environmental Science). Memorial University of Newfoundland, St. John's NL.
Kathrin Munro. 2012. Habitat suitability for boreal owls: home range and habitat use. M.Sc. (Environmental Science). Memorial University of Newfoundland, St. John's NL.
Melissa Creasey. 2009. Effects of overbrowsing by moose on bird communities in Gros Morne National Park. B.Sc. (Hons), Environmental Science, Memorial University of Newfoundland, Corner Brook NL.
Caryn Smith. 2008. Snag longevity and availability for cavity-nesters in post-harvest landscapes in western Newfoundland. M.Sc. (Cognitive and Behavioural Ecology), Memorial University of Newfoundland, St. John's NL.
Greg Mitchell. 2007. Habitat, behaviour and movements of juvenile songbirds in natural and harvested landscapes. M.Sc. (Biology), Acadia University, Wolfville NS.
Tina Leonard. 2007. Songbird space use and movement in heterogeneous landscapes vary with landscape structure and spatial scale. M.Sc. (Biology), Acadia University, Wolfville NS.
Renée Dawe. 2006. Factors contributing to nest predation and the implications of clear-cutting practices in the Main River watershed of Newfoundland. B.Sc. (Hons), Environmental Science, Memorial University of Newfoundland, Corner Brook NL.
Tina Leonard. 2003. Factors influencing colonization of the Trout River watershed, Gros Morne National Park, by exotic rainbow trout (Onchorhynchus mykiss). B.Sc. (Hons), Environmental Science, Memorial University of Newfoundland, Corner Brook NL.
Kristin Powell. 2002. Watersheds and water quality as determinants of anuran distribution in western Newfoundland. B.Sc. (Hons), Environmental Science, Memorial University of Newfoundland, Corner Brook NL.
Allison Fisher. 2000. Food availability and foraging behaviour of the northern waterthrush in western Newfoundland. B.Sc. (Hons), Environmental Science, Memorial University of Newfoundland, Corner Brook NL.
Shawn Roberts. 1999. Nest site characteristics of northern waterthrush in western Newfoundland. B.Sc. (Hons), Environmental Science, Memorial University of Newfoundland, Corner Brook NL.
Mark Yetman. 1999. Factors in the development of a snowmobile management plan for Gros Morne National Park: integrating conservation and social needs. M.Env.Sci. (Environmental Science), Memorial University of Newfoundland, St. John's NL.
Boreal & avian ecology
Whitaker DM, Taylor PD & Warkentin IG. 2015. Habitat use by Gray-cheeked Thrushes in a montane forest landscape of western Newfoundland, Canada. Avian Conservation & Ecology 10 (2):4. [online] URL: http://www.ace-eco.org/vol10/iss2/art4/
Bradshaw CJA & Warkentin IG. 2015. Global estimates of boreal forest carbon stocks and flux. Global and Planetary Change. 128:24-30. doi:10.1016/j.gloplacha.2015.02.004
Rae LF, Whitaker DM & Warkentin IG. 2015. Variable effect of chickadee mobbing call playback on detection probability of boreal forest birds. Journal of Field Ornithology 86:51-64. doi: 10.1111/jofo.12088
Moen J, L Rist, K Bishop, FS Chapin III, D Ellison, T Kuuluvainen, H Petersson, K Puettmann, J Rayner, IG Warkentin & CJA Bradshaw. 2014. Eye on the Taiga: removing global policy impediments to safeguard the boreal forest. Conservation Letters 7:408-418 doi: 10.1111/conl.12098
Rae LF, Whitaker DM & Warkentin IG. 2014. Multiscale impacts of herbivore-induced forest degradation on songbird assemblages. Diversity and Distributions 20:382-395. DOI: 10.1111/ddi.12133.
Warkentin IG & Bradshaw CJA. 2012. A tropical perspective on conserving the boreal ‘lung of the planet’. Biological Conservation 151:50-52.
Whitaker DM &Warkentin IG. 2010. Spatial ecology of migratory passerines on temperate and boreal forest breeding grounds. Auk 127:471-484.
Mitchell GW, Taylor PD & Warkentin IG. 2010. Assessing the function of broad-scale movements made by juvenile songbirds prior to migration. Condor 112:644-654.
Bradshaw CJA, Warkentin IG & Sodhi NS. 2009. Urgent preservation of boreal carbon stocks and biodiversity. Trends in Ecology & Evolution 24:541-548. doi: 10.1016j.tree.2009.03.019
Mitchell GW, Warkentin IG & Taylor PD. 2009. Movement of juvenile songbirds in harvested boreal forest: assessing residency time and landscape connectivity. Avian Conservation and Ecology - Écologie et Conservation des Oiseaux 4(1):5 [online] URL: http:// www.ace-eco.org/vol4/iss1/art5/
Leonard TD, Taylor PD & Warkentin IG. 2008. Space use by songbirds in naturally patchy and harvested boreal forests. Condor 110:467-481.
Smith CY, Warkentin IG & Moroni MT. 2008. Snag availability for cavity nesters across a chronosequence of post-harvest landscapes in western Newfoundland. Forest Ecology and Management 256:641-647.
Whitaker DM, Taylor PD & Warkentin IG. 2008. Survival of adult songbirds in boreal forest landscapes fragmented by clearcuts and natural openings. Avian Conservation and Ecology - Écologie et Conservation des Oiseaux 3(1):5 [online] URL: http://www.ace-eco.org/vol3/iss1/art5/
Thompson RG, Warkentin IG & Flemming SP. 2008. Response to logging by a limited but variable nest predator guild in the boreal forest. Canadian Journal of Forest Research 38:1974-1982.
Warkentin IG, Reed JM & Dunham SM. 2004. Offspring quality as an index of habitat degradation. Ornithological Science 3: 145-153. .
Warkentin IG, Fisher AL, Flemming SP & Roberts SE. 2003. Response to clear-cut logging by northern waterthrushes. Canadian Journal of Forest Research 33:755-762.
Tropical conservation ecology
Warkentin IG, Bickford DP, Sodhi NS & Bradshaw CJA. 2009. Eating frogs to extinction. Conservation Biology 23:1056-1059.
Warkentin IG & Sodhi NS. 2008. Financing tropical forest preservation. Science 320:874.
Sodhi NS, Posa MRC, Lee TM & Warkentin IG. 2008. Effects of tropical rainforest disturbance and loss on birds. Auk 125:511-519.
Warkentin, IG & Morton ES. 2000. Flocking and foraging behavior of wintering Prothonotary Warblers. Wilson Bulletin 112:88-98.
Warkentin, IG & Hernandez D. 1996. Conservation implications of site fidelity: a case study involving nearctic-neotropical migrant songbirds wintering in a Costa Rican mangrove. Biological Conservation 77: 143-150.
Warkentin, IG, Greenberg R & Salgado Ortiz J. 1995. Songbird use of gallery woodlands in recently cleared and older settled landscapes of the Selva Lacandona in Chiapas, Mexico. Conservation Biology 9: 1095-1106.
Warkentin IG, Espie RHM, Lieske DJ & James PC. 2016. Variation in selection pressures acting on body size by age and sex for a reverse sexually size dimorphic bird. Ibis. doi: 10.1111/ibi.12369
Mourocq E, Bize P, Bouwhuis S, Bradley RW, Charmantier A, de la Cruz C, Drobniak SM, Espie RHM, Hötker H, Kempenaers B, Krüger O, Herényi M, Marzluff JM, Nakagawa S, Mřller AP, Phillips RA, Radford AN, Roulin A, Schlicht E, Sheldon BC, Török J, Valencia J, Van de Pol M, Warkentin IG, Wood AG, Winney IS & Griesser M. 2016. Lifespan and reproductive cost explain interspecific variation in the optimal onset of reproduction. Evolution 70-2:296-313.
Warkentin IG, Lieske DJ, Espie, RHM, & James PC. 2013. Close inbreeding and dispersal in Merlins: further examination. Journal of Raptor Research 47: 69-74. DOI: 10.3356/JRR-12-00005.1
Warkentin IG, Sodhi NS, Espie RHM & Poole AF. 2005. Merlin (Falco columbarius). In The Birds of North America Online. (A. Poole, Ed.): http://bna.birds.cornell.edu/BNA/account/Merlin/ doi:10.2173/bna.44
Espie, RHM, James PC, Oliphant LW, Warkentin IG, & Lieske DJ. 2004. Influence of nest-site and individual quality on breeding performance in Merlins (Falco columbarius). Ibis 81:3404-3415. .
Espie, RHM, Oliphant LW, James PC, Warkentin IG, & Lieske DJ. 2000. Age dependent breeding performance in Merlins (Falco columbarius). Ecology 81:3404-3415. .
Warkentin, IG, Curzon AD, Carter RE, Wetton JH, James PC, Parkin DT & Oliphant LW. 1994. No evidence for extra-pair fertilizations in the Merlin revealed by DNA fingerprinting. Molecular Ecology 3: 229-234. .
Warkentin IG, James PC & Oliphant LW. 1991. Influence of site fidelity on mate switching in urban-breeding Merlins (Falco columbarius). Auk 108:294-302. .
Warkentin, IG & NH West. 1990. Ecological energetics of
Merlins (Falco columbarius). Physiological Zoology