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Lecture _24 Date ______

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Lecture _24 Date  ______ Powered By Docstoc
					Lecture #24   Date ________
                    Biodiversity crisis
F   Extinction ~ natural
    phenomenon, however, rate is of
    concern…..
F   Major Threats:
F   Habitat destruction ~ single
    greatest threat; cause of 73% of
    species designation as extinct,
    endangered, vulnerable, rare; 93%
    of coral reefs
F   Competition by exotic (non-
    native) species ~ cause of 68%
    of species designation as extinct,
    endangered, vulnerable, rare; travel
F   Overexploitation ~ commercial
    harvest or sport fishing; illegal
    trade
    Biodiversity: Human welfare
F   25% of all medical
    prescriptions
F   Genetic variability
F   Aesthetic and ethical
    reasons
F   Species survival
            Conservation biology focus
F   Preservationism: setting side select
    areas as natural and underdeveloped
F   Resource conservation: public
    lands to meet the needs of agriculture and
    extractive industries, i.e., ”multiple use”

F   Evolutionary / ecological view:
    natural systems result from millions of
    years of evolution and ecosystem
    processes are necessary to maintain the
    biosphere
         Geographic distribution of
               biodiversity
F   Energy availability ~ solar
    radiation
F   Habitat heterogeneity ~
    environmental patchiness

F   Niche specialization        ~
    narrow resource range
    specialization

F   Population interactions ~
    complex population interactions
       Population & species level conservation

F   Biodiversity hot spot: small area
    with an exceptional concentration of
    species
F   Endemic species: species found
    nowhere else
F   Endangered species: organism
    “in danger of extinction”
F   Threatened species: likely to
    become endangered in the foreseeable
    future
F   Bioremediation: use of living
    organisms to detoxify polluted systems
F   La Fin
F   El Extremo
F   Das Ende
F   L’ estremita
F   The End

				
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posted:7/19/2013
language:English
pages:7