GGR305H5 Lecture Notes - Lecture 3: Biogeography, Map Projection, Species Richness
Document Summary
More vegetation: more land present? near equator, stable climate in topics. Map projection stretching out of the poles; flattening out the. Land near poles appear larger than in reality. Norther hemisphere looks bigger and seem to have more landmass than the southern hemisphere (mercator. More landmass near equator (peters projection: similar climatic conditions. Argues that species have larger range (more suitable habitat) Tropics, even during glacial periods, were not covered in ice. This stability is ideal for species growth: no migration, no mass extinction (?) Species moving northward, due to warming of climate in the northern hemisphere. There are still fluctuations (drier and cooler in the past: change in climate may have enabled a high species, changing climates in tropics. There are changing of climate in tropics richness near equator. During glacial periods, moist, relatively warm area only existed in small pockets of area: isolated fragments in species. Evolved into different species: energy hypothesis.
