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ENV234H1 (49)
Helene Cyr (48)
Lecture 3

Lecture 3 for Environment.docx

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University of Toronto St. George
School of Environment
Helene Cyr

October 24 Notes In Ontario the trees that have turned color first are the native species The non native species have not changed in color yet. This is due to the fact that the native species have already adapted to the climate Trees change color due to the decrease in day length It is colder here than it is in Eastern Asia or Europe Day lengths are off (signals) Introduced species do catch up eventually  White mull berry: get hammered by early frost  But fall before they turn color  Might be a disadvantage in gaining nutrients with respect to native species At higher elevations= colder temperatures, their trees would change faster Forest Stratification: The Synusia Vegetation Zones of Ontario Why do trees even exist? What do living things need to keep living? How do they get them? Large morphological features of things Life Requirements: Animals: Water, oxygen, organic molecules, minerals, warmth, support How do animals obtain these things?  Through eating  Breathing  Skeleton (invertebrates external)  All requirements come through the front Plants  Sunlight  Inorganic carbon (CO2) Plants live in two environments (aerial portion and terrestrial environment) Trees have relationships with fungus to gain nutrients Main limiting factor to this is sunlight Competition= increase in health Circadian +plants one
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