BIO220H1 Lecture 23: BIO220 (Winter 2014) Lecture 23
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BIO220H1 Full Course Notes
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Lecture 23: climate effects on organisms, phenology & interactions. Basic eeb principles (and example of petm) leads us to expect: migrations. Altitudinal (toward mountaintops: evolutionary change, population dynamics, including extinction, phenological changes. Range of tolerance & ecological niche modeling: assume that a species is now found in places where conditions are suitable. Map where a species is found now. Measure ecological conditions there to produce an envelope of suitability (understand what characterizes habitat abiotic conditions) Use gcm (global climate model) to predict how conditions will change in the future. Map where conditions will be suitable in future: thus, predict how far the range will need to shift. Climate change migrations will be hampered by human-altered landscapes, animals can"t just migrate north: our changes have also altered the landscapes to disrupt migratory routines. Passenger pigeons: at the time of european settlement of na, there were millions of passenger pigeons. (probably about 3-5 billion, ~1/3 of all na bird individuals.
