4. Several frog and toad species have shifted
the timing of spring emergence and calling
in southeastern Ontario. In the four decades
of observation to date, the northern leopard
frog emerges significantly earlier now, by
an estimated 22 days. American toads have
advanced their start of calling by up to
19 days. This significant shift in breeding
behaviour for two species has occurred at
the same time as a significant local increase
in spring temperatures of an estimated
2.8°C over four decades.
8
5. Expansion of the native orchid nodding
ladies’ tresses northward since the 1980s
has been facilitated by its many small light
seeds’ ability to disperse naturally in the
wind and more northerly areas becoming
available with warming temperatures. The
orchid’s native range was traditionally
southern Ontario and US parts of the Great
Lakes Basin but it is now thriving on the
eastern shores of Lake Superior and
Algoma Highlands.
9
6. Until recently, the risk of Lyme disease, a
bacteria spread by some species of ticks,
has been restricted to localized areas
along the north shore of Lake Erie, Lake
Ontario, and the St. Lawrence River due to
temperature limitations. However, as the
climate changes, Lyme disease is emerging
as a serious health risk in many parts of
Ontario. Models suggest that the geographic
range of tick species that transmit Lyme
disease may expand significantly due to
climate change, with a northern expansion
of about 200 km projected by the year
2020. This expansion would likely be due
to longer growing seasons resulting from
warmer temperatures and decreased tick
mortality during milder winters.
10
8. Garroway, C., J. Bowman, T. Cascaden, G. Holloway, C. Mahan, J. Malcolm, M. Steele, G. Turner, P. Wilson. 2010. Climate
Change Induced Hybridization in Flying Squirrels. Global Change Biology. 16(1): 113-121. 3. Klaus, S. and S. Lougheed.
2013. Changes in breeding phenology of eastern Ontario frogs over four decades. Ecology and Evolution. 3(4): 835–845.
9. Catling, P. and Oldham, M. 2011. Recent Expansion of Spiranthes cernua (Orchidaceae) into Northern Ontario due to Climate
Change? The Canadian Field Naturalist.125:34-40.
10. Nituch, L. and J. Bowman. 2013. Community-Level Effects of Climate Change on Ontario’s Terrestrial Biodiversity. Ontario
Ministry of Natural Resources, Climate Change Resources Report Card-36.
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Michael Oldham
Wasyl Bakowsky