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ENVR 202 Lecture Notes - Logarithmic Scale, Rubiaceae, Lincoln Near-Earth Asteroid Research


Department
Environment
Course Code
ENVR 202
Professor
Brian Leung

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LECTURE 2 Patterns of Diversity (Jan 9th, 2013)
Nature of diversity
o Biological hierarchical organizational structure
o Environmental special and temporal pattern
o Scaling continental/local interactions
Global trends in species diversity processes that created
patterns
o Species-area relationship
o Latitudinal patterns in diversity
Spatiotemporal interactions in biotic/abiotic diversity
Political ecology of biodiversity
Biological Diversity
The variety and variability of life at diff lvls of biological
organization
Species Diversity -> variations among individuals w/in a
species
o 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)
o Know a lot of species and their evolutionary relations
o Fossils past life forms,
o 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
o GROUPS
Bacteria
Archaea
Eukarya
o 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
Time line on fossil records, dating
Origins = oceans, not as rich of a fossil record
Fossil evidence juxtapose explanations with
patterns based on evidence
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