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CONSERVATION BIOLOGY & BIODIVERSITY
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Conservation Biology A branch of biology that studies the biological diversity with conservation as its main focus Balances human needs for available resources & maintaining biodiversity
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Visit www.ibiblio.org/lunarbin/worldpop www.ibiblio.org/lunarbin/worldpop For up to the minute population growth
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LDC vs MDC & Resource consumption?
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Value of Biodiversity Agricultural Value Genetic resources Biological control Many insects are pollinators of flowering plants Source of Food Food from wild animals, fishes, plants, & algae Medicinal Value
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Indirect Value of Biodiversity Biogeochemical value Waste disposal Provision of fresh water Prevention of soil erosion Regulation of climate Ecotourism
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Causes of Extinction Habitat loss due to human activities Brazilian rain forest loses 2 million hectare/yearhectare/year 60% of coral reefs have been destroyeddestroyed 45% of mangrove ecosystems were lostwere lost Accidental introduction of alien species (purple loosestrife)purple loosestrife Pollution (acid rain, eutrophication, ozone depletion, global warming)eutrophication Overexploitation (overfishing, hunting, illegal collection of decorative plants)
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Study case: in U.S. 1880 spp. were threatened and endangered because of habitat loss, invasion, pollution, & diseases
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Agents of Habitat Loss Importance of various forms of habitat loss. (Stein, et al, 2000, pg. 245)
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Coral
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Mangr ove Mangrove estuary (Kenya) showing prop roots (roots from stem that help anchor the plant) Photo by Nico Koedam
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Effect of Invasive Species See next slide for the effect of invasive species
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America’s least wanted: Purple Loosestrife (Lythrum salicaria) www.npwrc.usgs.gov/resource/1999/loosstrf/loosstrf.htm
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Striga asiatica (witchweed) A parasitic plant of cereals like corn. Accidentally introduced in the States with great consequences Seeds corn witchweed sorghum
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Eutrophication
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Lake Neatahwanta, Fulton NY The Post-Standard, June 4, 2004: Lake algae may be Killing Animals
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