ENVR 202 Lecture Notes - Logarithmic Scale, Rubiaceae, Lincoln Near-Earth Asteroid Research
Document Summary
Lecture 2 patterns of diversity (jan 9th, 2013) Nature of diversity: biological hierarchical organizational structure, environmental special and temporal pattern, scaling continental/local interactions. Global trends in species diversity processes that created patterns: species-area relationship, latitudinal patterns in diversity. The variety and variability of life at diff lvls of biological organization. Species diversity -> variations among individuals w/in a species: genetic basis of evolution; origin of species. Communities and ecosystems -> abiotic (plant-animal) and biotic (predator/prey, disease) Grouping species in earth"s diversity (species diversity: know a lot of species and their evolutionary relations, fossils past life forms, dna sequences reconstruct phylogenetic relationships of major grps of organisms; evolutionary. Modification through descent: over time new species arise in lineages that share ancestry. Evolutionary trees delineate from one original ancestor: groups. Eukarya: temporal patterns in animal diversity: evolutionary time scales. General trend of increasing diversity over long time periods but punctuated by occasional mass extinctions that reduce global diversity.