Biology 2485B Lecture 22: 22 Climate Change Effects on Organisms and Ecosystems
12 Apr 2018
School
Department
Course
Professor
Document Summary
The polar bear is native to the arctic circle and depends on sea ice for hunting its main prey, seals. They are: snow cover, glacier volume, sea ice area, greater variability in weather conditions and more frequent extreme weather events are also predicted, as global warming proceeds, it modifies temperature-dependent biological phenomena. Climate envelope: climatic conditions under which a particular species can persist (climatic niche") Species with longer lifespans and generation times will not evolve rapidly and will be more dependent on their capacity for phenotypic plasticity: ex. caterpillar could evolve rapidly in response to temp, bird will have a slower response. Spatial shifts in the range of organisms: animals and plants will move towards the poles or upward in elevation. Speckled wood butterfly: data looking at where the species occurs at different time intervals: distribution has been shifting over the 1900s, black and red southern end, blue more northern as time progresses.
