endangered species
DESCRIPTION
ENDANGERED SPECIES. 1.2.3.4.BIOLOGICAL DIVERSITY. SPECIES = a group of closely related organisms capable of breeding and producing fertile offspring Every day , somewhere on Earth, a unique species of organism becomes extinct - PowerPoint PPT PresentationTRANSCRIPT
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ENDANGERED SPECIES
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1.2.3.4.BIOLOGICAL DIVERSITY SPECIES = a group of closely related organisms capable of
breeding and producing fertile
offspring
Every day , somewhere on Earth, a unique species of organism becomes extinct
Over 1.7 million species known to science, most are INSECTS (see p 241)
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4.5.Levels of BIODIVERSITY BIOLOGICAL DIVERSITY -refers to the # and type of
species in a given area -an important natural resource SPECIES = all different populations ECOSYSTEM = variety of habitats
and eco- logical processes GENETIC = all the different D.N.A.
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6. Benefits of Biodiversity Stability of ecosystem Sustainability of ecosystem Species survival Human use and benefit - medicine - shelter -
products - food - clothing -
knowledge - crops(hybrids)
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7.Pacific YewSlow growing tree in old growth forests of Pacific North West
Considered ‘trash’ tree
Bark contains TAXOL
Promising treatment for breast and ovarian cancer trt
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7.Purple foxglove
Contains DIGITALIS
Prevents ‘dropsy’ (heart failure)
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8. Keystone species
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(8A) Why save species?(bottom of p 1 notes)
Ethical reasons- the right thing to do, right to exist
Aesthetic reasons- beauty, enjoyment, pets, nature
Commercial- agriculture, jobs, tourism, fishing & hunting
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Major extinctions- see p 245
All generaWell defined genera
Trend lineBig Five mass extinctionsOther mass extinctions
Million Years Ago Thousands of Genera
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10.LEVELS OF THREAT
EXTINCT- gone forever
ENDANGERED- likely to b/c extinct w/o
protective measures
THREATENED- has a declining population
likely to b/c endangered
See table p 246
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11.Prone to Extinctions
Rate of extinctions increasing Since 1800 up to 25% of all species
extinct
Species with small populations Species with a limited range Migratory species Species with special needs Species exploited by humans
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12.Why are Species in Danger?Destruction of habitatIntroduction of nonnative species
Pollution/PesticidesOverharvestingClimate Change
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AREAS of Critical Biodiversity
Tropical Rain Forests
Coral ReefsCoastal AreasIslands
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13.Biodiversity Hotspots- p 250
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The most remarkable areas on earth are also the most threatened. These are the Hotspots, the richest and most threatened reservoirs of plants and animal life on Earth.”
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14.California Floristic Province
Zone of Mediterranean climate
Many unique plants like Giant Sequoia
Also critically endangered Ca. Condor
Threatened by farming, pollution, overpopulation, road building etc.
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15. Cross out question
INSTEAD:
Answer Questions 20-21-22-23 On page 260 in the space for #15
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16.How do we Conserve Species? Captive Breeding Preservation of Genetic Material Zoos, Parks and Gardens Research Protection of habitats & ecosystems International cooperation Laws
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California Condor
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International Cooperation
International Union for the Conservation of Nature and Natural Resources (I.U.C.N.)- produce RED LIST
The Convention on International Trade in Endangered Species-elephants and ivory
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17. Endangered Species Act Signed by President Nixon in 1973 Protect species from economic
growth & development Overseen by N.O.A.A. and U.S. Fish &
Wildlife Must make list of endangered
species Must protect from human harm Must prevent projects that jeopardize
species Must create recovery plan
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Research Endangered Species in your assigned Country
Media Center Work:
Monday Nov 26th- Period 11
Tuesday Nov 27th- Period 4/5
Come in to class Wednesday with the info on your Endangered Species
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