Chapter 26, lecture 22 and 23.docx

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18 Apr 2012
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Chapter 26
Biodiversity: genetic change/evolution which brings about new species.
Biological Diversity components
Ecological diversity: The measure of biodiversity that takes into account variation
in ecological roles of species
Genetic diversity: genetic variation In and between species.
Phylogenetic diversity: the diversity between phylogenies. 5 mice represent less
phylogenetic diversity than a mouse, cat and elephant.
Geographic component: species limited to small areas are called endemic species
and srea with lots of endemic species has high endemism. Ex. Oceanic islands
Biodiversity’s value
Social: social customs of eating
Economic : hunting/destruction. ecotourism
Ecological:
Indication of environmental quality: predatory birds
Extinction:
Background extinction- normal low rate extinction
Mass extinction- volcanoes
Anthropogenic extinction- human caused
Human activities and their effects:
Fragmentation
Loss of environment
Aquatic system seem to be particularly vulnerable to species introduction.
Minimal viable population (mvp):- The smallest population of the species that can sustain
itself in the face of environmental variation.
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