October 22 notes
World Floricities and Vegetation
How doe the Flora and vegetation of Ontario fit into Worldwide?
Vegetation Zonation in Canada show both longtitudinal and latitudinal effects
Latitudinal distribution (slide 4)
Doesn’t reflect the distribution limits of particular species
Boundaries are fluid
As you travel around the world there are two things that vary:
1. Different plants and animals
2. Way the plants look in different parts of the world
Difference between flora and vegetation?
Floristic map very different from vegetation map
Biota plants and animals + microorganisms (fungi, bacteria, single celled protozoa etc)
Populations are aggregates of a single species in a particular space
What explains this Zonation?
It could be an accident of history of it might reflect our present environment
- Plants have occupied the whole of Ontario for only the last 10,000 years (not a lot of time)
- Beginning of the Holocene/start of agriculture in the middle east
Could differential migration rates among tree species be responsible?
Record of wind pollinated trees, mostly
Change with time trees migrating
Doesn’t look like migration is going on in( our part of the world)
With the exception of the last 50-100 years (migration of species northwards, flowering sooner
migration starting again, but it is an isolated event) probably due to human influences
Kanoo, Manitoba, Saskatchewan was entirely underwater- doesn’t effect Ontario distribution Going back even further