BIO120H1 Lecture Notes - Lecture 15: Scarlet Macaw, Ecological Niche, Invasive Species
31 Oct 2018
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Bio120 lecture 134: climate and other niche axes. October 29, 2018 (relevant reading part 3, struggle for existence; simutext chapter: biogeography, Section 4; optional: part 4, struggle for existence) Climatic variables as important niche axes: e. g. Biomes: latitude mostly determines terrestrial biomes. Sources of climatic variation beyond the basic latitudinal belts (oceans, mountains) Climate warming and range shifts: predicted range shift: how will climate change influence malaria distribution in s. In 2003, a study of 1046 species estimated that species are moving polewards at a rate of 6. 1km per decade. The niche is an n-dimensional hypervolume in which each axis is an ecological factor important to the species being considered (hutchinson 1957) Heated air rises; air cools as it rises, 5-10 degrees c/km. As air cools, water vapour condenses and falls as rain near the equator. Dry, high-pressure areas at +/- 30 degrees latitude. Intertropical convergence zone shifts seasonally, producing rainy and dry seasons in some parts of the tropics.
