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BIODIVERSITY

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Neem tree Azadirachta indica, India Treatment of many diseases, insecticide, spermicide Fig. 10-18f, p. 205 – PowerPoint PPT presentation

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Title: BIODIVERSITY


1
Neem tree Azadirachta indica, India Treatment
of many diseases, insecticide, spermicide
Fig. 10-18f, p. 205
2
Solutions
Sustaining Tropical Forests
Restoration
Prevention
Protect most diverse and endangered
areas Educate settlers about sustainable
agriculture and forestry Phase out subsidies
that encourage unsustainable forest use Add
subsidies that encourage sustainable forest
use Protect forests with debt-for-nature swaps
and conservation easements Certify sustainably
grown timber Reduce illegal cutting Reduce
poverty Slow population growth
Reforestation Rehabilitation of degraded
areas Concentrate farming and ranching on
already-cleared areas
Fig. 10-20, p. 207
3
Kenyas Green Belt Movement Individuals Matter
  • Wangari Maathai founded the Green Belt Movement.
  • The main goal is to organize poor women to plant
    (for fuelwood) and protect millions of trees.
  • In 2004, awarded Nobel peace prize.

Figure 10-10A
4
MANAGING AND SUSTAINING GRASSLANDS
  • Almost half of the worlds livestock graze on
    natural grasslands (rangelands) and managed
    grasslands (pastures).
  • We can sustain rangeland productivity by
    controlling the number and distribution of
    livestock and by restoring degraded rangeland.

5
MANAGING AND SUSTAINING GRASSLANDS
  • Overgrazing (left) occurs when too many animals
    graze for too long and exceed carrying capacity
    of a grassland area.

Figure 10-21
6
MANAGING AND SUSTAINING GRASSLANDS
  • Example of restored area along the San Pedro
    River in Arizona after 10 years of banning
    grazing and off-road vehicles.

Figure 10-22
7
Case Study Grazing and Urban Development in the
American West
  • Ranchers, ecologists, and environmentalists are
    joining together to preserve the grasslands on
    cattle ranches.
  • Paying ranchers conservation easements (barring
    future owners from development).
  • Pressuring government to zone the land to prevent
    development of ecologically sensitive areas.

8
NATIONAL PARKS
  • Countries have established more than 1,100
    national parks, but most are threatened by human
    activities.
  • Local people invade park for wood, cropland, and
    other natural resources.
  • Loggers, miners, and wildlife poachers also
    deplete natural resources.
  • Many are too small to sustain large-animal
    species.
  • Many suffer from invasive species.

9
Case Study Stresses on U.S. National Parks
  • Overused due to popularity.
  • Inholdings (private ownership) within parks
    threaten natural resources.
  • Air pollution.

Figure 10-23
10
Solutions
National Parks
Integrate plans for managing parks and nearby
federal lands Add new parkland near threatened
parks Buy private land inside parks Locate
visitor parking outside parks and use shuttle
buses for entering and touring heavily used
parks Increase funds for park maintenance and
repairs Survey wildlife in parks Raise
entry fees for visitors and use funds for park
management and maintenance Limit the number of
visitors to crowded park areas Increase the
number and pay of park rangers Encourage
volunteers to give visitor lectures and tours
Seek private donations for park maintenance and
repairs
Fig. 10-24, p. 211
11
NATURE RESERVES
  • Ecologists call for protecting more land to help
    sustain biodiversity, but powerful economic and
    political interests oppose doing this.
  • Currently 12 of earths land area is protected.
  • Only 5 is strictly protected from harmful human
    activities.
  • Conservation biologists call for full protection
    of at least 20 of earths land area representing
    multiple examples of all biomes.

12
NATURE RESERVES
  • Large and medium-sized reserves with buffer zones
    help protect biodiversity and can be connected by
    corridors.
  • Costa Rica has consolidated its parks and
    reserves into 8 megareserves designed to sustain
    80 if its biodiversity.

Figure 10-10B
13
Caribbean Sea
Guanacaste
Nigaragua
Llanuras de Tortuguero
Costa Rica
La Amistad
Arenal
Bajo Tempisque
Panama
Cordillera Volcanica Central
Pacifico Central
Peninsula Osa
Pacific Ocean
Fig. 10-B, p. 213
14
  • 34 hotspots identified by ecologists as important
    and endangered centers of biodiversity.

Figure 10-26
15
Case Study The U.S. Endangered Species Act
  • Biodiversity hotspots in relation to the largest
    concentrations of rare and potentially endangered
    species in the U.S.

Figure 11-18
16
Top Six Hot Spots 1 Hawaii 2 San Francisco Bay
area 3 Southern Appalachians 4 Death Valley 5
Southern California 6 Florida Panhandle
Concentration of rare species
Low
Moderate
High
Fig. 11-18, p. 241
17
Biodiversity Definition Variety of different
species.
18
Species Diversity Number of different species
and their relative abundances in a given area.
19
Genetic Diversity Variety in the genetic makeup
of organisms of a species that allow the species
to reproduce and gain a competitive advantage
20
Ecosystem Diversity The variety of forests,
deserts, grasslands, oceans, lakes, etc.
21
Importance of Diversity
  • Stability- stable environment
  • Genetic reserves- genetic diversity
  • Medicinal- medicines
  • Agricultural- food
  • Industrial- building homes things we use
  • Scientific- experimental new technology
  • Aesthetic- beautiful
  • Ethical- what should we do regarding the
    environment
  • Religious- religious beliefs regarding
    environment

22
Extinction Lights Out
  • Extinction occurs when the population cannot
    adapt to changing environmental conditions.
  • The golden toad of Costa Ricas Monteverde cloud
    forest has become extinct because of changes in
    climate.

Figure 4-11
23
Species and families experiencing mass
extinction
Bar width represents relative number of living
species
Millions of years ago
Era
Period
Current extinction crisis caused by human
activities. Many species are expected to become
extinct within the next 50100 years.
Extinction
Quaternary
Today
Cenozoic
Tertiary
Extinction
65
Cretaceous up to 80 of ruling reptiles
(dinosaurs) many marine species including
many foraminiferans and mollusks.
Cretaceous
Mesozoic
Jurassic
Triassic 35 of animal families, including many
reptiles and marine mollusks.
Extinction
180
Triassic
Permian 90 of animal families, including over
95 of marine species many trees, amphibians,
most bryozoans and brachiopods, all trilobites.
Extinction
250
Permian
Carboniferous
Extinction
345
Devonian 30 of animal families, including
agnathan and placoderm fishes and many trilobites.
Devonian
Paleozoic
Silurian
Ordovician
Extinction
Ordovician 50 of animal families, including
many trilobites.
500
Cambrian
Fig. 4-12, p. 93
24
Effects of Humans on Biodiversity
  • The scientific consensus is that human activities
    are decreasing the earths biodiversity.

Figure 4-13
25
Terrestrial organisms
Silurian
Permian
Jurassic
Devonian
Devonian
Cambrian
Ordovician
Cretaceous
Marine organisms
Pre-cambrian
Carboniferous
Number of families
Quaternary
Tertiary
Millions of years ago
Fig. 4-13, p. 94
26
History of Extinctions
Endangered Species
  • Extinctions have existed long before humans had
    an influence
  • However

27
The current extinction crisis is the first to be
caused by a single species- US! . This is
happening faster than ever a few decades versus
thousands to millions of years. Humans are
eliminating not only the species but, the
environment. Ex. Tropical rainforest
28
Extinct- Complete disappearance of a species
from the earth. Ex Dinosaurs
VOCABULARY
29
SPECIES EXTINCTION
  • Species can become extinct
  • Locally A species is no longer found in an area
    it once inhabited but is still found elsewhere in
    the world.
  • Ecologically Occurs when so few members of a
    species are left they no longer play its
    ecological role.
  • Globally (biologically) Species is no longer
    found on the earth.

30
Global Extinction
  • Some animals have become prematurely extinct
    because of human activities.

Figure 11-2
31
Endangered and Threatened Species Ecological
Smoke Alarms
  • Endangered species so few individual survivors
    that it could soon become extinct.
  • Threatened species still abundant in its natural
    range but is likely to become endangered in the
    near future.

Figure 11-3
32
Fig. 11-3, p. 224
33
Florida manatee
Grizzly bear
Kirklands warbler
Knowlton cactus
African elephant
Swallowtail butterfly
Humpback chub
Utah prairie dog
Siberian tiger
Golden lion tamarin
Fig. 11-3, p. 224
34
Giant panda
Whooping crane
Northern spotted owl
Blue whale
Black-footed ferret
Mountain gorilla
Florida panther
Hawksbill sea turtle
California condor
Black rhinoceros
Fig. 11-3, p. 224
35
Endangered- Species with so few survivors that
the species could soon become extinct. Ex
Leopard
36
Threatened/Vulnerable Wild species that is still
abundant in its natural range but is likely to
become endangered because of a decline in
numbers. Ex Northern Sea Lion
37
Rare A noticeable decline in a species. Ex
African Violet some Orchids
38
ECOLOGICAL RESTORATION
  • Restoration trying to return to a condition as
    similar as possible to original state.
  • Rehabilitation attempting to turn a degraded
    ecosystem back to being functional.
  • Replacement replacing a degraded ecosystem with
    another type of ecosystem.
  • Creating artificial ecosystems such as
    artificial wetlands for flood reduction and
    sewage treatment.

39
ECOLOGICAL RESTORATION
  • Five basic science-based principles for
    ecological restoration
  • Identify cause.
  • Stop abuse by eliminating or sharply reducing
    factors.
  • Reintroduce species if necessary.
  • Protect area form further degradation.
  • Use adaptive management to monitor efforts,
    assess successes, and modify strategies.

40
Will Restoration Encourage Further Destruction?
  • There is some concern that ecological restoration
    could promote further environmental destruction
    and degradation.
  • Suggesting that any ecological harm can be
    undone.
  • Preventing ecosystem damage is far cheaper than
    ecological restoration.

41
Mitigation Costs
  • The costs of offsetting damages. For example,
    how much would it cost to protect a forest from
    cutting, move an endangered species to a new
    habitat, or restore a statue damaged by air
    pollution?

42
Restoration
  • Research and scientific study devoted to
    restoring, repairing, and reconstructing damaged
    ecosystems.

43
Preservation
  • Setting aside or protecting undisturbed natural
    areas from harmful human activities.

44
Remediation
  • Repairing an ecosystem that has been destroyed.

45
Sustainability
  • Ability of a system to survive for some specified
    time.

46
WHAT CAN WE DO?
  • Eight priorities for protecting biodiversity
  • Take immediate action to preserve worlds
    biological hot spots.
  • Keep intact remaining old growth.
  • Complete mapping of worlds biodiversity for
    inventory and decision making.
  • Determine worlds marine hot spots.
  • Concentrate on protecting and restoring lake and
    river systems (most threatened ecosystems).

47
WHAT CAN WE DO?
  • Ensure that the full range of the earths
    ecosystems are included in global conservation
    strategy.
  • Make conservation profitable.
  • Initiate ecological restoration products to heal
    some of the damage done and increase share of
    earths land and water allotted to the rest of
    nature.

48
SPECIES EXTINCTION
  • Some species have characteristics that make them
    vulnerable to ecological and biological
    extinction.

Figure 11-4
49
Characteristic
Examples
Blue whale, giant panda, rhinoceros Blue whale,
giant panda, Everglades kite Many island
species, elephant seal, desert pupfish Bengal
tiger, bald eagle, grizzly bear Blue whale,
whooping crane, sea turtles Many island
species, African violet, some orchids Snow
leopard, tiger, elephant, rhinoceros, rare
plants and birds California condor, grizzly
bear, Florida panther
Low reproductive rate (K-strategist) Specialized
niche Narrow distribution Feeds at high trophic
level Fixed migratory patterns Rare Commercial
ly valuable Large territories
Fig. 11-4, p. 225
50
  • Low Reproductive Rate
  • Specialized Feeding Habits
  • Feed at high trophic levels
  • Large size
  • Specialized nesting or breeding areas
  • Found only in one place or region
  • Fixed migratory patterns
  • Preys on livestock or people
  • Behavioral Patterns

51
SPECIES EXTINCTION
  • Scientists use measurements and models to
    estimate extinction rates.
  • The International Union for the Conservation of
    Nature and Natural Resources (IUCN) publishes an
    annual Red List, listing the worlds threatened
    species.
  • The 2004 Red List contains 15,589 species at risk
    for extinction.

Figure 11-5
52
SPECIES EXTINCTION
  • Percentage of various species types threatened
    with premature extinction from human activities.

Figure 11-5
53
HABITAT LOSS, DEGRADATION, AND FRAGMENTATION
  • Conservation biologists summarize the most
    important causes of premature extinction as
    HIPPO
  • Habitat destruction, degradation, and
    fragmentation
  • Invasive species
  • Population growth
  • Pollution
  • Overharvest

54
Causes of Endangerment
  • Habitat Loss- people moving in (the number one
    reason for endangerment!)
  • Biotic pollution- polluted air, water, etc
  • Over-Hunting
  • Commercial Harvest- sold for profit

55
Location Where Endangerment is a Problem
  • United States- California, Hawaii, Texas and
    Southeastern states like Florida
  • Worldwide- Places that dont control poaching and
    starving countries that need the food. Ex.
    Africa, Asia, Middle East.

56
Conservation Biology- Multidisciplinary science
that deals with the crisis of diversity and how
to maintain the earths ecosystems.
Methods used to help Endangered Species
57
In Situ
In situ vs. ex situ
  • Leaving the animal where it lives but protecting
    it.
  • Ex. Elephants make laws that prevent poaching
    and have people to enforce it.
  • Ex. Marine turtles are protected- escape nets
    must be used on all fishing nets so the turtles
    can get out and not drown.

58
Ex Situ
  • Taking the animal out of its habitat protecting
    it.
  • Ex. Zoos
  • 2 types
  • egg pulling -collecting wild eggs laid by
    critically endangered bird species and then
    hatching them in zoos or research centers
  • captive breeding, wild individuals of a
    critically endangered species are captured for
    breeding in captivity, with the aim of
    reintroducing the offspring into the wild.

59
Indian Tiger
Range 100 years ago
Range today (about 2,300 left)
Fig. 11-8a, p. 230
60
Black Rhino
Range in 1700
Range today (about 3,600 left)
Fig. 11-8b, p. 230
61
African Elephant
Probable range 1600
Range today
Fig. 11-8c, p. 230
62
Asian or Indian Elephant
Former range
Range today (34,00054,000 left)
Fig. 11-8d, p. 230
63
INVASIVE SPECIES
  • Many nonnative species provide us with food,
    medicine, and other benefits but a a few can wipe
    out native species, disrupt ecosystems, and cause
    large economic losses.

Kudzu vine was introduced in the southeastern
U.S. to control erosion. It has taken over native
species habitats.
Figure 11-A
64
INVASIVE SPECIES
  • Many invasive species have been introduced
    intentionally.

Figure 11-11
65
INVASIVE SPECIES
  • Many invasive species have been introduced
    unintentionally.

Figure 11-11
66
INVASIVE SPECIES
  • The Argentina fire ant was introduced to Mobile,
    Alabama in 1932 from South America.
  • Most probably from ships.
  • No natural predators.

Figure 11-12
67
What Can You Do?
Invasive Species
Do not allow wild animals to escape. Do not
spread wild plants to other areas. Do not dump
the contents of an aquarium into waterways,
wetlands, or storm drains. When camping use
wood near your campsite instead of bringing
firewood from somewhere else. Do not dump
unused bait into the water. After dogs visit
woods or the water brush them before taking them
home. After each use clean your vehicle,
mountain bike, surfboard, kayaks, canoes, boats,
tent, hiking boots, and other gear before heading
for home. Empty all water from canoes, kayaks,
dive gear, and other outdoor equipment before
heading home. Plant a variety of trees,
shrubs, and other plants in your yard to reduce
losses from invasive species. Do not buy
plants from overseas or swap them with others
using the Internet.
Fig. 11-14, p. 236
68
Characteristics of Successful Invader Species
Characteristics of Ecosystems Vulnerable to
Invader Species
Climate similar to habitat of invader
Absence of predators on invading species Early
successional systems Low diversity of
native species Absence of fire Disturbed by
human activities
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
Fig. 11-13, p. 236
69
Pollution
  • Each year pesticides
  • Kill about 1/5th of the U.S. honeybee colonies.
  • 67 million birds.
  • 6 -14 million fish.
  • Threaten 1/5th of the U.S.s endangered and
    threatened species.

Example of biomagnification of DDT in an aquatic
food chain.
Figure 11-15
70
OVEREXPLOITATION
  • Some protected species are killed for their
    valuable parts or are sold live to collectors.
  • Killing predators and pests that bother us or
    cause economic losses threatens some species with
    premature extinction.
  • Legal and illegal trade in wildlife species used
    as pets or for decorative purposes threatens some
    species with extinction.

71
Habitat Protection
  • A prevention strategy Federally protect or
    protect the environment before endangerment
    occurs.

72
Habitat Restoration
  • Renewing, repairing, or reconstructing damaged
    ecosystems.

73
RECONCILIATION ECOLOGY
  • Reconciliation ecology involves finding ways to
    share places we dominate with other species.
  • Replacing monoculture grasses with native
    species.
  • Maintaining habitats for insect eating bats can
    keep down unwanted insects.
  • Reduction and elimination of pesticides to
    protect non-target organisms (such as vital
    insect pollinators).

74
Using Reconciliation Ecology to Protect Bluebirds
  • Putting up bluebird boxes with holes too small
    for (nonnative) competitors in areas where trees
    have been cut down have helped reestablish
    populations.

Figure 11-B
75
Zoos, aquaria, gardens, etc.
  • Breeding programs, protection, teach public about
    the animals/ plants so they will want to conserve
    them.

76
Conservation Organizations
  • Some are severe like Greenpeace- bomb whaling
    vessels, etc., others send money or try to pass
    laws.

77
Policy Laws Endangered Species Act- 1973
  • One of the worlds toughest environmental laws.
  • It is illegal for Americans to import or trade in
    any product made from an endangered or threatened
    species unless it is used for an approved
    scientific purpose or to enhance the survival of
    the species.
  • Authorizes the Marine Fishery Service and the
    U.S. Fish and Wildlife Service to identify and
    list all other endangered threatened species.
  • These species cannot be hunted, killed, collected
    or injured in the U.S.

78
Case Study U.S. Endangered Species Act
  • One of the worlds most far-reaching and
    controversial environmental laws is the 1973 U.S.
    Endangered Species Act (ESA).
  • ESA forbids federal agencies (besides defense
    department) to carry out / fund projects that
    would jeopardize an endangered species.
  • ESA makes it illegal for Americans to engage in
    commerce associated with or hunt / kill / collect
    endangered or threatened species.

79
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80
OVEREXPLOITATION
  • Rhinoceros are often killed for their horns and
    sold illegally on the black market for decorative
    and medicinal purposes.

Figure 11-16
81
Case Study Rising Demand for Bushmeat in Africa
  • Bushmeat hunting has caused the local extinction
    of many animals in West Africa.
  • Can spread disease such as HIV/AIDS and ebola
    virus.

Figure 11-17
82
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83
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84
Endangered Species
  • Because of scarcity of inspectors, probably no
    more than 1/10th of the illegal wildlife trade in
    the U.S. is discovered.

Figure 11-19
85
Endangered Species
  • Congress has amended the ESA to help landowners
    protect species on their land.
  • Some believe that the ESA should be weakened or
    repealed while others believe it should be
    strengthened and modified to focus on protecting
    ecosystems.
  • Many scientists believe that we should focus on
    protecting and sustaining biodiversity and
    ecosystem function as the best way to protect
    species.

86
Local Examples of Endangered Species
  • American Alligator- threat.
  • Peregrine Falcon- DM
  • Whooping Crane- end.
  • Bald Eagle- DM
  • Grizzly Bear- threatened

87
PROTECTING WILD SPECIES LEGAL AND ECONOMIC
APPROACHES
  • International treaties have helped reduce the
    international trade of endangered and threatened
    species, but enforcement is difficult.
  • One of the most powerful is the 1975 Convention
    on International Trade of Endangered Species
    (CITES).
  • Signed by 169 countries, lists 900 species that
    cannot be commercially traded.

88
CITIES Treaty
  • Convention on International Trade in Endangered
    Species of Wild Fauna and Flora
  • Banned all international trade in elephant
    products to protect elephant populations that
    were being decimated by poachers.
  • Signed by 152 countries and lists more than 800
    species that cannot be commercially traded as
    live specimens or wildlife products because they
    are in danger of extinction and 29,000 other
    species whose international trade is monitored
    because they are at risk of becoming threatened.

89
What Can You Do?
Sustaining Terrestrial Biodiversity
Adopt a forest. Plant trees and take care
of them. Recycle paper and buy recycled paper
products. Buy sustainable wood and wood
products. Choose wood substitutes such as
bamboo furniture and recycled plastic outdoor
furniture, decking, and fencing. Restore a
nearby degraded forest or grassland. Landscape
your yard with a diversity of plants natural to
the area. Live in town because suburban sprawl
reduces biodiversity.
Fig. 10-27, p. 219
90
What Can You Do?
Protecting Species
Do not buy furs, ivory products, and other
materials made from endangered or threatened
animal species. Do not buy wood and paper
products produced by cutting remaining
old-growth forests in the tropics. Do not buy
birds, snakes, turtles, tropical fish, and other
animals that are taken from the wild. Do not
buy orchids, cacti, and other plants that are
taken from the wild. Spread the word. Talk to
your friends and relatives about this problem and
what they can do about it.
Fig. 11-21, p. 246
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