T.D. Drezner

Department of Geography

Associate Professor

Office: Ross Building, S408
Phone: (416) 736-2100 Ext: 20511
Emaildrezner@yorku.ca

I am a biogeographer with ecological interests that include deserts (how high temperature and aridity shape desert communities, facilitation and positive plant interactions), cactus species and their demographics, and riparian areas and disturbance. My interests extend beyond arid environments to also include disturbance and dispersal in some tropical rain forest ecosystems, and Great Lakes and urban environments, including disturbance and invasive species.

Area of Specialization

Biogeography

Degrees


Research Interests

Deserts and Arid Lands, Plant-Climate Interactions, Disturbance and Invasion

All Publications

Journal Articles

Drezner, T.D., Drezner, Z., Balakrishnan, N. 2015. Estimating the transition of individuals between life stages. Environmetrics. 26: 526-533.

Dinh, T. Hewitt N., and Drezner, T.D. 2015. Fire history reconstruction in the black oak (Quercus velutina) savanna of High Park, Toronto. Natural Areas Journal. 35(3): 468-475.

Drezner, T.D. 2015. Regional environmental conditions affect microsite response in a keystone desert species. Journal of Arid Environments. 116: 89-95.

Gorelick, R., Drezner, T.D., Hancock, K. 2015. Freeze-tolerance of cacti (Cactaceae) in Ottawa, Ontario, Canada. Madroņo 62: 33-45.

Drezner, T.D. 2014. The keystone saguaro (Carnegiea gigantea, Cactaceae): a review of its ecology, associations, reproduction, limits, and demographics. Braun-Blanquet invited review. Plant Ecology. 215: 581-595.

Danzer S. and Drezner, T.D. 2014. Relationships between epidermal browning, girdling, damage, and bird cavities in a military restricted database of 12,000+ plants of the keystone Carnegiea gigantea in the northern Sonoran Desert. Madroņo. 61: 115-125.

Drezner, T.D. 2014. How long does the giant saguaro live? Life, death and reproduction in the desert. Journal of Arid Environments. 104: 34-37.

Fall, P.L. and Drezner, T.D. 2013. Species origins, dispersal, and island vegetation dynamics in the South Pacific. Annals of the Association of American Geographers. 103: 1041-1057.

Drezner, T.D. 2013. The paradoxical distribution of a shallow-rooted keystone species away from surface water, near the water-limited edge of its range in the Sonoran Desert: Seed-seedling conflicts. Acta Oecologica. 47: 81-84.

Medeiros, A.S. and Drezner, T.D. 2012. Vegetation, climate, and soil relationships across the Sonoran Desert. Ecoscience. 19(2): 148-160.

Donnermeyer, C.J. and Drezner, T.D. 2012. Cohort establishment on slopes: growth rates, demographic patterns, and the relationship to volcanic eruptions. Journal of Arid Environments. 76: 133-137.

Drezner, T.D. 2011. Cactus surface temperatures are impacted by seasonality, spines and height on plant. Environmental and Experimental Botany. 74: 17-21.

Lam, D.K., Remmel, T.K., and Drezner, T.D. 2011. Tracking desertification in California using remote sensing: a sand dune encroachment approach. Remote Sensing. 3: 1-13.

Fall, P.L. and Drezner, T.D. 2011. Plant dispersal, introduced species, and vegetation change in the South Pacific Kingdom of Tonga. Pacific Science. 65(2): 143-156.

Danzer, S. and Drezner, T.D. 2010. Demographics of more than 12,000 individuals of a keystone species in the northern Sonoran Desert since the mid-1800s. International Journal of Plant Sciences. 171(5): 538-546.

Drezner, T.D. and Balling, R.C. Jr. 2008. Regeneration cycles of the keystone species Carnegiea gigantea are linked to worldwide volcanism. Journal of Vegetation Science 19: 587-596

Drezner, T.D. 2008. Variation in age and height of onset of reproduction in the saguaro cactus (Carnegiea gigantea) in the Sonoran Desert. Plant Ecology. 194: 223-229.

Drezner, T.D. and Lazarus, B.L. 2008. The population dynamics of columnar and other cacti: a review. Invited to Geography Compass. 2: 1-29.

Fall, P.L., Drezner, T.D., and Franklin, J. 2007. Dispersal ecology of the lowland rain forest in the Vava’u Island Group, Kingdom of Tonga. New Zealand Journal of Botany. 45: 393-417.

Drezner, T.D. 2007. An analysis of winter temperature and dew point under the canopy of a common Sonoran Desert nurse and the implications for positive plant interactions. Journal of Arid Environments. 69: 554-568.

Tenorio, R.C. and Drezner, T.D. 2006. Native and invasive vegetation of karst springs in Wisconsin’s Driftless Area. Hydrobiologia. 568: 499-505.

Drezner, T.D. 2006. The regeneration of a protected Sonoran Desert cactus since 1800 A.D. over 50,000 km2 of its range. Plant Ecology. 183: 171-176.

Drezner, T.D. 2006. Regeneration of Carnegiea gigantea (Cactaceae) since 1850 in three populations in the northern Sonoran Desert. Acta Oecologica. 29: 178-186.

Drezner, T.D. 2006. Plant facilitation in extreme environments: the non-random distribution of saguaro cacti (Carnegiea gigantea) under their nurse associates and the relationship to nurse architecture. Journal of Arid Environments. 65: 46-61.

Drezner, T.D. 2005. Saguaro (Carnegiea gigantea, Cactaceae) growth rate over its American range and the link to summer precipitation. Southwestern Naturalist. 50(1): 65-68.

Drezner, T.D. 2004. Few native species colonize on mud flats ten years after dam removal (Wisconsin). Ecological Restoration. 22(1): 50-51.

Drezner, T.D. 2003. A test of the relationship between seasonal rainfall and saguaro cacti branching patterns. Ecography. 26(4): 393-404.

Drezner, T.D. 2003. Saguaro (Carnegiea gigantea, Cactaceae) age-height relationships and growth: the development of a general growth curve. American Journal of Botany. 90(6): 911-914.

Drezner, T.D., and Garrity, C.M. 2003. Saguaro distribution under nurse plants in Arizona's Sonoran Desert: directional and microclimate influences. Professional Geographer. 55(4): 505-512.

Drezner, T.D. 2003. Revisiting Bergmann's Rule for saguaros (Carnegiea gigantea (Engelm.) Britt. and Rose): stem diameter patterns over space. Journal of Biogeography. 30: 353-359.

Drezner, T.D. 2003. Regional- and local-scale variations in plant distribution in the Sonoran Desert. Madroņo. 50(2): 122-125.

Drezner, T.D. and Balling, R.C. Jr. 2002. Climatic controls of saguaro (Carnegiea gigantea) regeneration: a potential link with El Niņo. Physical Geography. 23(6): 465-475.

Drezner, T.D., Fall, P.L., and Stromberg, J.C. 2001. Plant distribution and dispersal mechanisms at the Hassayampa River Preserve, Arizona, U.S.A. Global Ecology and Biogeography. 10: 205-217.

Approach To Teaching

In 2015 I was honoured to receive the Department's UNDERGRADUATE TEACHING AWARD, as selected by students. I teach a variety of classes, including -Physical Geography (1400) -Intro to Statistics (2420) -Disaster! The Earth's Extreme Natural Events (3700) -Desert Ecosystems (4410) -Seminar in Physical Geography (graduate class, 5600) and irregularly -Biogeography (3500) -Physical Geography of the City (3900)


I am a biogeographer with ecological interests that include deserts (how high temperature and aridity shape desert communities, facilitation and positive plant interactions), cactus species and their demographics, and riparian areas and disturbance. My interests extend beyond arid environments to also include disturbance and dispersal in some tropical rain forest ecosystems, and Great Lakes and urban environments, including disturbance and invasive species.

Area of Specialization

Biogeography

Degrees



Research Interests:

Deserts and Arid Lands, Plant-Climate Interactions, Disturbance and Invasion

All Publications

Journal Articles

Drezner, T.D., Drezner, Z., Balakrishnan, N. 2015. Estimating the transition of individuals between life stages. Environmetrics. 26: 526-533.

Dinh, T. Hewitt N., and Drezner, T.D. 2015. Fire history reconstruction in the black oak (Quercus velutina) savanna of High Park, Toronto. Natural Areas Journal. 35(3): 468-475.

Drezner, T.D. 2015. Regional environmental conditions affect microsite response in a keystone desert species. Journal of Arid Environments. 116: 89-95.

Gorelick, R., Drezner, T.D., Hancock, K. 2015. Freeze-tolerance of cacti (Cactaceae) in Ottawa, Ontario, Canada. Madroņo 62: 33-45.

Drezner, T.D. 2014. The keystone saguaro (Carnegiea gigantea, Cactaceae): a review of its ecology, associations, reproduction, limits, and demographics. Braun-Blanquet invited review. Plant Ecology. 215: 581-595.

Danzer S. and Drezner, T.D. 2014. Relationships between epidermal browning, girdling, damage, and bird cavities in a military restricted database of 12,000+ plants of the keystone Carnegiea gigantea in the northern Sonoran Desert. Madroņo. 61: 115-125.

Drezner, T.D. 2014. How long does the giant saguaro live? Life, death and reproduction in the desert. Journal of Arid Environments. 104: 34-37.

Fall, P.L. and Drezner, T.D. 2013. Species origins, dispersal, and island vegetation dynamics in the South Pacific. Annals of the Association of American Geographers. 103: 1041-1057.

Drezner, T.D. 2013. The paradoxical distribution of a shallow-rooted keystone species away from surface water, near the water-limited edge of its range in the Sonoran Desert: Seed-seedling conflicts. Acta Oecologica. 47: 81-84.

Medeiros, A.S. and Drezner, T.D. 2012. Vegetation, climate, and soil relationships across the Sonoran Desert. Ecoscience. 19(2): 148-160.

Donnermeyer, C.J. and Drezner, T.D. 2012. Cohort establishment on slopes: growth rates, demographic patterns, and the relationship to volcanic eruptions. Journal of Arid Environments. 76: 133-137.

Drezner, T.D. 2011. Cactus surface temperatures are impacted by seasonality, spines and height on plant. Environmental and Experimental Botany. 74: 17-21.

Lam, D.K., Remmel, T.K., and Drezner, T.D. 2011. Tracking desertification in California using remote sensing: a sand dune encroachment approach. Remote Sensing. 3: 1-13.

Fall, P.L. and Drezner, T.D. 2011. Plant dispersal, introduced species, and vegetation change in the South Pacific Kingdom of Tonga. Pacific Science. 65(2): 143-156.

Danzer, S. and Drezner, T.D. 2010. Demographics of more than 12,000 individuals of a keystone species in the northern Sonoran Desert since the mid-1800s. International Journal of Plant Sciences. 171(5): 538-546.

Drezner, T.D. and Balling, R.C. Jr. 2008. Regeneration cycles of the keystone species Carnegiea gigantea are linked to worldwide volcanism. Journal of Vegetation Science 19: 587-596

Drezner, T.D. 2008. Variation in age and height of onset of reproduction in the saguaro cactus (Carnegiea gigantea) in the Sonoran Desert. Plant Ecology. 194: 223-229.

Drezner, T.D. and Lazarus, B.L. 2008. The population dynamics of columnar and other cacti: a review. Invited to Geography Compass. 2: 1-29.

Fall, P.L., Drezner, T.D., and Franklin, J. 2007. Dispersal ecology of the lowland rain forest in the Vava’u Island Group, Kingdom of Tonga. New Zealand Journal of Botany. 45: 393-417.

Drezner, T.D. 2007. An analysis of winter temperature and dew point under the canopy of a common Sonoran Desert nurse and the implications for positive plant interactions. Journal of Arid Environments. 69: 554-568.

Tenorio, R.C. and Drezner, T.D. 2006. Native and invasive vegetation of karst springs in Wisconsin’s Driftless Area. Hydrobiologia. 568: 499-505.

Drezner, T.D. 2006. The regeneration of a protected Sonoran Desert cactus since 1800 A.D. over 50,000 km2 of its range. Plant Ecology. 183: 171-176.

Drezner, T.D. 2006. Regeneration of Carnegiea gigantea (Cactaceae) since 1850 in three populations in the northern Sonoran Desert. Acta Oecologica. 29: 178-186.

Drezner, T.D. 2006. Plant facilitation in extreme environments: the non-random distribution of saguaro cacti (Carnegiea gigantea) under their nurse associates and the relationship to nurse architecture. Journal of Arid Environments. 65: 46-61.

Drezner, T.D. 2005. Saguaro (Carnegiea gigantea, Cactaceae) growth rate over its American range and the link to summer precipitation. Southwestern Naturalist. 50(1): 65-68.

Drezner, T.D. 2004. Few native species colonize on mud flats ten years after dam removal (Wisconsin). Ecological Restoration. 22(1): 50-51.

Drezner, T.D. 2003. A test of the relationship between seasonal rainfall and saguaro cacti branching patterns. Ecography. 26(4): 393-404.

Drezner, T.D. 2003. Saguaro (Carnegiea gigantea, Cactaceae) age-height relationships and growth: the development of a general growth curve. American Journal of Botany. 90(6): 911-914.

Drezner, T.D., and Garrity, C.M. 2003. Saguaro distribution under nurse plants in Arizona's Sonoran Desert: directional and microclimate influences. Professional Geographer. 55(4): 505-512.

Drezner, T.D. 2003. Revisiting Bergmann's Rule for saguaros (Carnegiea gigantea (Engelm.) Britt. and Rose): stem diameter patterns over space. Journal of Biogeography. 30: 353-359.

Drezner, T.D. 2003. Regional- and local-scale variations in plant distribution in the Sonoran Desert. Madroņo. 50(2): 122-125.

Drezner, T.D. and Balling, R.C. Jr. 2002. Climatic controls of saguaro (Carnegiea gigantea) regeneration: a potential link with El Niņo. Physical Geography. 23(6): 465-475.

Drezner, T.D., Fall, P.L., and Stromberg, J.C. 2001. Plant distribution and dispersal mechanisms at the Hassayampa River Preserve, Arizona, U.S.A. Global Ecology and Biogeography. 10: 205-217.


Teaching:

Approach To Teaching

In 2015 I was honoured to receive the Department's UNDERGRADUATE TEACHING AWARD, as selected by students. I teach a variety of classes, including -Physical Geography (1400) -Intro to Statistics (2420) -Disaster! The Earth's Extreme Natural Events (3700) -Desert Ecosystems (4410) -Seminar in Physical Geography (graduate class, 5600) and irregularly -Biogeography (3500) -Physical Geography of the City (3900)