Lecture 23.doc

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University of Toronto St. George
James Thomson

Lecture 23 Climate Effects on Organisms PhenologyInteractionsSlide 1We should see animal ranges to shift match between organisms ranges of tolerance will be preserved If it gets too hot we expect migrations toward cold placesLatitudinaltoward poles up the side of the mountainsWere seeing both of these shifts altitudinal and latitudinalEcological forests will favour migration Phenological changesflowering time will also change with climateSlide 2Use a climate model to see how those ecological conditions ie temperature values are going to shift in the future so you can then draw the conditions that are favorable to the species in a future climate and thatll tell you where the new range is Slide 3IPCC rise45 degrees over 100 yearsPETM6 degrees over 20000 years Unclear whether the change is too fast for species to migrate or adaptmore extinctions perhaps Slide 4Longest migration of any North American mammalsSummerhigh elevation Winterlower elevation Animals shift if their climate changes know from PETM What has happened with the modern landscape that makes it easier or harder for them to adjust to a change in climate by migrationoNow that we have fences its much harder to move across that landscape their ability to solve a problem by moving to a different climate by migration is limited by the type of landscapeSlide 8Theyre bad at jumping and get caught and killed because of the barbed wireNow there are safer fences no barbs on the lower levels pronghornsafe fences placed by farmers but they still have difficulty to get through Slide 9This is not due to climate change but this show how an animal can be set back horribly due to a change in landscape configuration One of the most abundant birds before in NA at the time of European settlement
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