chapter 22 sustaining wild species chapter 22 sustaining wild species
TRANSCRIPT
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Chapter 22Sustaining Wild Species
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The Story of Martha
Oh high above the trees and the reeds like rainbows they landed soft as moonglow in greens and reds they fluttered past the windows ah but nobody cared or saw til the hungry came in crowds with their guns and dozers and soon the peace was over God what were they thinking of? Oh on and on til dreams come true you know a piece of us all goes with you Oh the birds went down they fell and they faded to the dozens Til in a Cincinnati Zoo was the last one Yes all that remained was the last with a name of Martha Very proud, very sad, but very wise Oh as the lines filed by there were few who cared or could be bothered how could anyone have treated you harder and it was all for a dollar or more Oh on and on til dreams come true you know a piece of us all goes with you Oh and surrounded there by some of whom wept around her in a corner of the cage they found her she went as soft as she came so shy til the last song oh the passenger pigeon was gone... John Harold
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The last word in ignorance is the person who says of an animal or plant: “What good is it?...If the land mechanism as a whole is good, whether we understand it or not…Harmony with land is like harmony with a friend; you cannot cherish his right hand and chop off his left.
Aldo Leopold
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Key ConceptsKey Concepts
Human effects on biodiversityHuman effects on biodiversity
Importance of biodiversityImportance of biodiversity
How human activities affect wildlifeHow human activities affect wildlife
Management of wildlifeManagement of wildlife
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22.1 Human Impacts on Biodiversity
A. Factors that increase biodiversity
Physically diverse habitat Small - moderate
environmental disturbances
Evolution
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B. Factors that decrease biodiversity
Environmental stress- *decrease habitats is greatest threat
Large disturbances Extreme conditions Limitation of
essential resources Introduction of alien
species Geographic
Isolation
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67%Secure orapparently
secure
1%Other
16%Vulnerable
8%Imperiled
7%Critically imperiled
1% Probably extinct
Fig. 22.4, p. 554
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How Serious is a Loss of Biodiversity?
Some argue that the threat is exaggerated…
1. We don’t know how many species there are
2. We don’t know the true value of all species in ecosystems
3. Estimates are based on models that lack data
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Should We Focus on Sustaining Species or Ecosystems?
A. Ecosystem Approach Major goal is to assure that
there is enough protected land and water to provide habitat.
B. Species-by-Species Approach Identify most at-risk species Understand the species Focus on protecting them
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C. SANCTUARY APPROACH- Creation of Refuges- Gene Banks/Botanical Gardens- Zoo/Aquariums
* Egg Pulling* Captive Breeding
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The Species Approach The Ecosystem Approach
Goal
Protect species frompremature extinction
Strategies
• Identify endangered species
•Protect their critical habitats
Tactics• Legally protect endangered species
• Manage habitat
• Propagate endangered species in captivity
• Reintroduce species into suitable habitats
Goal
Protect populations ofspecies in their naturalhabitats
Strategy
Preserve sufficient areasof habitats in differentbiomes and aquaticsystems
Tactics• Protect habitat areas through private
purchase or government action
• Eliminate or reduce populations of alien species from protected areas
• Manage protected areas to sustain native species
• Restore degraded ecosystems
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22.2 Three Types of ExtinctionA. Local Extinction:Species is no longer found in an area it
once was, but it is found in other areas.
Ex. White tail deer was near a local extinction but has recovered to a large population size.
*Roosevelt was most influential in increasing the White Tailed Deer population.
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B. Ecological Extinction: So few that it can no longer
play its ecological role
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C. Biological Extinction: Species is no longer found
anywhere on the earth Biological Extinction is Forever Irreversible loss of genes
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What are Endangered and Threatened Species?
Endangered: So few individual
survivors that the species can become extinct over all or part of its range
Threatened or Vulnerable: Still abundant in its
natural range and may become endangered
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Threatened and Endangered Species of Pennsylvania Links: PA GAME COMMISSION PA FISH AND BOAT COMMISSION US FISH AN WILDLIFE SERVICE
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Rare Species: Naturally small
populations due to limited geographic range
Locally depleted by human activities
Vulnerable to extinction
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Characteristic ExamplesLow reproductive rate(K-strategist)
Specialized niche
Narrow distribution
Feeds at high trophic level
Fixed migratory patterns
Rare
Commercially valuable
Large territories
Blue whale, giant panda,rhinocerosBlue whale, giant panda,Everglades kite
Many island species,elephant seal, desert pupfish
Bengal tiger, bald eagle,grizzly bearBlue whale, whooping crane,sea turtlesMany island species,African violet, some orchidsSnow leopard, tiger, elephant, rhinoceros, rare plants and birdsCalifornia condor, grizzly bear, Florida panther
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Background vs. Mass Extinction
Background Extinction-
A small, naturally occurring, low rate extinction.
Fossil records show 1-14 species a year
(Approximately 1 species / million) 0.0001% per year
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B. Mass Extinction- A rise above the background rate, often catastrophic and global.Estimated to be five in the past 500 million years
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Geological Periods
Millions of years ago
Nu
mb
er o
f fa
mil
ies
of
mar
ine
anim
als
Mass extinctions
800
600
400
200
0570 505 438 360 286 208 144 65 0
CambrianOrdovician
SilurianDevonian
Carboniferous
Permian
TriassicJurassic
Cretaceous
TertiaryQuaternary
?
408 245 2
Fig. 22.10, p. 558
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Extinction of the Dinosaurs
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22.3 Why Care About Biodiversity?
The Earth’s Overall Biodiversity has 2 Types of Value:
1. Instrumental Value: Usefulness to humans
2. Intrinsic Value: Because they exist regardless
of their value
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SIDE NOTE
Biologists claim that species have medical and scientific value, ecological value, and economic value.
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Value of Nature
Instrumental Intrinsic
Utilitarian Non-utilitarian
(human centered) (species orecosystemcentered)
Goods
Ecological services
Information
Recreation
Existence
Aesthetic
Bequest
Fig. 22.11, p. 561
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Instrumental Values
Utilitarian (Use)
-Economic goods
-Ecological Services
-Information-Recreation
Non-Utilitarian (Nonuse)
-Existence-Aesthetic-Bequest
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Rauvolfia
Rauvolfia sepentina, Southeast AsiaTranquilizer, high blood pressure medication
Fig. 22.12a, p. 561
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FoxgloveDigitalis purpurea, EuropeDigitalis for heart failure
Fig. 22.12b, p. 561
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Pacific yewTaxus brevifolia, Pacific NorthwestOvarian cancer
Fig. 22.12c, p. 561
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CinchonaCinchona ledogeriana, South AmericaQuinine for malaria treatment
Fig. 22.12d, p. 561
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Rosy periwinkleCathranthus roseus, MadagascarHodgkin's disease, lymphocytic leukemia
Fig. 22.12e, p. 561
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Neem treeAzadirachta indica, IndiaTreatment of many Diseases acts as aninsecticide
Fig. 22.12f, p. 561
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Overfishing
Habitatloss
Habitatdegradation
Introducingnonnativespecies
Commercialhunting
andpoaching
Sale ofexotic pets
anddecorative
plants
Predatorand
pest control
Pollution
Climatechange
Basic Causes
• Population growth• Rising resource use• No environmental
accounting• Poverty
Fig. 22.13, p. 564
Causes of Premature Extinction
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A. Habitat loss and degradation -Greatest threat to wild species -In U.S. the major disturbances
are… *agriculture *development *outdoor recreation *grazing *pollution
22.4 CAUSES FOR PREMATURE EXTINCTION
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Habitat Fragmentation
–A large, continuous area of habitat is reduced in area and divided into a patchwork of isolated areas.
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Can result in loss of genetic diversity, create barriers, create limited habitats.
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Asian or Indian Elephant
Former range
Range today(34,000–54,000 left)
Fig. 22.14d, p. 565
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Indian Tiger
Range 100 years ago
Range today(about 2,300 left)
Fig. 22.14a, p. 565
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Black Rhino
Range in 1700
Range today(about 2,400 left)* endangered* Fig. 22.14b, p. 565
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African Elephant
Probable range 1600
Range today(600,000 left)
Decline due to habitat loss, legal ivory trade, and poaching
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2. Harm by Nonnative Species
-U.S. has 50,000 Nonnative species
-49% of 1,200 endangered and threatened species are threatened by nonnative species. **Can decrease biodiversity.
-Nonnative species fall into two catagories…
A. Deliberately Introduced
B. Accidentally Introduced
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A. Deliberately Introduced -Supply 98% of U.S. food
-Can have detrimental affects w/no predators, parasites, or competition to control numbers.
Example: Asian Carp
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KUDZU VINE:
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B. Accidentally Introduced Many times they are
transported in shipping products
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1918
Fig. 22.18, p. 570
2000
Expansion of the fire ant in southern states.
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Formosia termite
Tiger Mosquito- introduced the
West Nile disease
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Characteristics ofSuccessful
Invader Species
• High reproductive rate, short generation time (r-selected species)
• Pioneer species
• Long lived
• High dispersal rate
• Release growth- inhibiting chemicals into soil
• Generalists
• High genetic variability
Characteristics ofEcosystems Vulnerable
to Invader Species
• Similar climate to habitat of invader
• Absence of predators on invading species
• Early successional species
• Low diversity of native species
• Absence of fire
• Disturbed by human activities
-Control of Nonnative species begins with identifying characteristics that allow them to succeed
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3. Commercial Hunting/Poaching
-International trade of wild plant and animals is worth $10-$20 billion dollars per year.
-1/4 of total is in illegal sales.
Animals worth more if made an attraction for Ecotourism.
Gorilla - $150,000 Chimp - $50,000 Rhino Horn - $13,000/lb. Bushmeat - $150 million /yr.
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Fig. 22.24, p. 576
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This family of Gorillas was Slaughtered for Bush meat
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Orphans of the Slaughter
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Gorilla Hand: A Delicacy
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Poachers Use a Chain Saw to Remove a Rhino Horn
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POACHING A EGG
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Ivory Trade
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Profiting from Safaris 5min flash
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A Controversial Management Practice “Culling” 5min flash
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4. Exotic Pets
-25 Million U.S. households have exotic birds
-Leads to a loss of Ecotourism
-Use of Cyanide to capture tropical fish
-Orchids and Cacti for decoration
* The pet trade has depleted populations of birds, tropical fish, and mammals
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Using Chemicals to catch exotic fish 3min flash
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5. Climate Change and Pollution
-Increase in global warming -Introduction of
pesticides/herbicides, etc.
6. Loss of Genetic Diversity -Decreased ability to reproduce and
adapt to changing conditions
Founder Effect InbreedingGenetic Drift Bottleneck Effect
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22.5 Solutions to Protecting Species
A. International Treaties
1. CITES (1975 Convention on International Trade in Endangered Species)
800 species that can’t be traded
29,000 species regulated since they are at risk of becoming threatened
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LIMITED SUCCESS for CITES
Difficult to enforce Small fines for those
convicted Countries can exempt
themselves Many countries that have not
signed CITES
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B. National Laws1. LACEY ACT 1900: Prohibits transport of dead animals
across state lines without a permit2. ENDANGERED SPECIES ACT: *Most
species on listed on ESA have not recovered.
Illegal to import or trade any product from an endangered or threatened species…
Unless used for scientific purposes
* 1st organism to be listed on ESA due to global climate change = Polar Bear
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Who Determines What is Protected?
National Marine Fisheries Service:List and identify Ocean Species
U.S. Fish and Wildlife Service:Identify all other endangered
species. Also regulates the enforcement of the ESA and CITIES Treaty
* Fines and imprisonment can be imposed to ensure the protection of endangered species
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Concentration of rare species
Low Moderate High
Top Six Hot Spots
1 Hawaii2 San Francisco Bay area3 Southern Appalachians4 Death Valley5 Southern California6 Florida Panhandle
4
5
2
6
3
1 Fig. 22.23, p. 575
6 Hotspots for Endangered Species
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Charcoal Roadblock 4min
http://www.youtube.com/watch?v=9cnPljd_jJg&feature=player_embedded
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http://www.youtube.com/watch?v=tJ5nfgYJhD4
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What Have Land Owners Done to Avoid the ESA?
Some land owners have managed their land so less endangered species use it
*The Bald Eagle was the first organism to be protected under the ESA
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Should We Weaken the ESAConcerns about the economic impacts…1. Make protection on private land
voluntary2. Have the gov’t pay for lost land3. Make it harder to list new species4. Give the secretary of the interior
the right to allow a species to become extinct
5. Can allow exemptions to states6. Prohibit public lawsuits
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Should the ESA be Strengthened?
0.05% of projects have been blocked by ESA
The act does allow for economic concerns
“God Squad” – any federal project can be exempted from ESA to prevent economic loss
Government will bargain with HCP’s
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Habitat Conservation Plans (HCP) Used as a compromise between
the interests of land owners and the threatened species
Owners are allowed to destroy some habitat or endangered species on private land…
In exchange for taking measures to protect the species
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Protective Measures of HCP’s
Set aside a part of the habitat as a preserve
Pay to relocate to a suitable habitat
Pay the government to buy suitable habitat elsewhere.
What are the concerns with this type of plan?
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Removing Barriers of ProtectionSafe Harbor Agreement: Land owners voluntarily
restore habitat on their land
Candidate Conservation Agreement:
Landowners volunteer to take steps to help declining populations not yet listed
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Should We Try to Protect all Species?
Can’t possibly save all Focus on…1. Most likely to succeed2. Ones with the greatest
amount of ecological value3. The most useful in medicine* FOCUS ON KEYSTONE
SPECIES
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Biome % of Area Disturbed
Temperate broadleaf forests
Temperate evergreen forests
Temperate grasslands
Mixed mountain systems
Tropical dry forests
Subtropical and temperate rain forests
Cold deserts and semidesert
Mixed island systems
Warm deserts and semideserts
Tropical humid forests
Tropical grasslands
Temperate Boreal forests
Tundra
94%
94%
72%
71%
70%
67%
55%
53%
44%
37%
26%
18%
0.7%Fig. 22.15, p. 566
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Type of Nonnative Organism Annual Losses and damagesCrop disease
Crop weeds
Rats
Feral cats and outdoor pet cats
Crop insects
Livestock diseases
Forest insects and diseases
Zebra mussels
Common pigeon
Formosan termite
Fishes
Asian clam
Feral pigs
Starlings
Fire ant
$23.5 billion
$23.5 billion
$19 billion
$17 billion
$14 billion
$9 billion
$4.8 billion
$3 billion
$1.1 billion
$1.1 billion
$1.1 billion
$1.1 billion
$0.8 billion
$0.8 billion
$0.6 billionFig. 22.16, p. 566
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Estimation of Extinction Risks1. Population Viability Analysis (PVA) Risk assessment with math and
stats2. Minimal Viable Population (MVP) Smallest # of individuals necessary
to ensure the survival of a population
3. Minimum Dynamic Area (MDA) Minimum area of habitat needed to
maintain the MVP