apes chapter 11: day 1 objectives describe hippco list the threats to aquatic life agenda warm-up...
TRANSCRIPT
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APES Chapter 11: Day 1
Objectives• Describe HIPPCO• List the threats to
aquatic life
Agenda• Warm-up – 5• HIPPCO notes – 10• Strange Days – 10• HIPPCO Notes – 10• Computer Lab
Warm-up1. What is the
epilimnion? Hypolimnion?
2. How does the temperature of each change with season?
Homework:Chapter 11 Objectives
Homework:Chapter 11 Objectives
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Sustaining Aquatic Biodiversity
Chapter 11
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Core Case Study: A Biological Roller Coaster Ride in Lake Victoria
Shallow lake in East Africa• 500 species of fish
found nowhere else
Nile perch: deliberately introduced• Loss of biodiversity and
cichlids (“SIK-lids”)• Increased poverty and
malnutrition• Depleted forests (to
preserve fish oil)
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Core Case Study: A Biological Roller Coaster Ride in Lake Victoria
Frequent algal blooms• Nutrient runoff• Spills of untreated
sewage• Less algae-eating
cichlids
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11.1
What are the major threats to aquatic
biodiversity?
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We Have Much to Learn about Aquatic Biodiversity
Greatest marine biodiversity• Coral reefs• Estuaries • Deep-ocean floor
Biodiversity is higher• Near the coast than in the open sea • In the bottom region of the ocean than the
surface region
We have We have explored 5% explored 5% of the global of the global
ocean!ocean!
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Human Activities Are Destroying and Degrading Aquatic Habitats
Habitat loss and degradation• Marine
• Coastal pollution and tourism
• Ocean floor: effect of trawlers
• Freshwater• Dams• Excessive water
withdrawal
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Science Focus: Protecting and Restoring Mangroves
Protect and restore mangroves• Reduce the impact
of rising sea levels• Protect against
tropical storms and tsunamis
• Cheaper than building concrete sea walls
• Mangrove forests in Indonesia
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Natural Capital Degradation: Area of Ocean Bottom Before and After a Trawler
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Invasive Species Are Degrading Aquatic Biodiversity
Invasive species • Threaten native
species• Disrupt and
degrade whole ecosystems
• 84% of world’s coasts are being colonized by invasive species
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Invasive Species Are Degrading Aquatic Biodiversity
Three examples• Water hyacinth: Lake
Victoria (East Africa)• Asian swamp eel:
waterways of south Florida
• Purple loosestrife: indigenous to Europe• Treating with natural
predators—a weevil species and a leaf-eating beetle—Will it work?
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Science Focus: How Carp Have Muddied Some Waters
Lake Wingra, Wisconsin (U.S.): eutrophic• Contains invasive
species• Purple loosestrife and
the common carp increase turbidity
Dr. Richard Lathrop• Removed carp from an
area of the lake• This area appeared to
recover• More photosynthesis
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Population Growth and Pollution Can Reduce Aquatic Biodiversity
Nitrates and phosphates mainly from fertilizers enter water• Leads to
eutrophication
Toxic pollutants from industrial and urban areas
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Population Growth and Pollution Can Reduce Aquatic Biodiversity
Nitrates and phosphates mainly from fertilizers enter water• Leads to
eutrophication
Toxic pollutants from industrial and urban areas
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Climate Change Is a Growing Threat
Global warming: sea levels will rise and aquatic biodiversity is threatened• Coral reefs• Swamp some low-
lying islands• Drown many highly
productive coastal wetlands• New Orleans,
Louisiana, and New York City
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Video Clip
Strange Days on Planet Earth – Dirty Secrets• Bleaching the Reef
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Overfishing and Extinction: Gone Fishing, Fish Gone
Marine and freshwater fish • Threatened with extinction by human
activities more than any other group of species
• Modern industry can cause 80% depletion of target species in 10-15 years
Commercial extinction – occurs when it is no longer profitable to continue fishing an affected species
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Overfishing and Extinction: Gone Fishing, Fish Gone
Bycatch – nontarget species caught in fishing• Comprises almost 1/3 of
world’s annual fish catch
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Case Study: Industrial Fish Harvesting Methods
Trawler fishing • Dragging funnel shaped
nets held open at the neck along ocean bottom
• Weighted down with chains or metal plates
• Newer nets are large enough to swallow 12 jumbo jet planes!
• Catch shrimp, cod, flounder, and scallops
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Case Study: Industrial Fish Harvesting Methods
Purse-seine fishing• Spotter plane
locates school of fish• Vessel encloses it
with large net• Catch surface
dwelling species (tuna, mackerel, anchovies, and herring)
• Dolphins frequent bycatch
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Case Study: Industrial Fish Harvesting Methods
Longlining• Putting out lines up to 80 miles long with
baited hooks• Adjustable depths• Frequent bycatch (sea turtles and seabirds)
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Case Study: Industrial Fish Harvesting Methods
Drift-net fishing• Fish caught by huge
drifting nets• Hang as deep as 50
feet below surface• Extend 40 miles
long• 1992 UN ban on use
of nets longer than 1.6 miles
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Major Commercial Fishing Methods Used to Harvest Various Marine Species
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11.2
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11-2 How Can We Protect and Sustain Marine Biodiversity?
Concept 11-2 We can help to sustain marine biodiversity by using laws and economic incentives to protect species, setting aside marine reserves to protect ecosystems, and using community-based integrated coastal management.
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Legal Protection of Some Endangered and Threatened Marine Species
Why is it hard to protect marine biodiversity? • Human ecological
footprint and fishprint are expanding
• Much of the damage in the ocean is not visible
• The oceans are incorrectly viewed as an inexhaustible resource
• Most of the ocean lies outside the legal jurisdiction of any country
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Case Study: Protecting Whales: A Success Story… So Far
Cetaceans: Toothed whales and baleen whales• Bite and chew food
vs. filter feeders 1970: U.S. • Stopped all
commercial whaling• Banned all imports of
whale products 1986: moratorium on
commercial whaling• Pros? Cons?
Tourism…
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Norwegian Whalers Harpooning a Sperm Whale
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Examples of Cetaceans
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Examples of Cetaceans
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Individuals Matter: Creating an Artificial Coral Reef in Israel
Reuven Yosef, Red Sea Star Restaurant• Coral reef
restoration• Reconciliation
ecology• Treatment of
broken coral with antibiotics
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Case Study: Holding Out Hope for Marine Turtles
Carl Safina, Voyage of the Turtle• Studies of the
leatherback turtle
Threats to the leatherbacks• Trawlers• Pollution• Climate change
Communities protecting the turtles
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Marine Sanctuaries Protect Ecosystems and Species
Offshore fishing• A country’s offshore fishing zone extends
20 statute miles from its shores• Exclusive economic zones – foreign
ships may extend into foreign waters when given governmental permission
• High seas – free for all!
Law of the Sea Treaty – coastal nations have jurisdiction over 36% of ocean surface and 90% fish stocks
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Marine Sanctuaries Protect Ecosystems and Species
Marine Protected Areas (MPAs) – areas of ocean partially protected from human activities• 4, 000 nationwide• 200 US• Only partially protected• Harmful human activities still illegally occur
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Establishing a Global Network of Marine Reserves: An Ecosystem Approach
Marine reserves – fully protected!• Closed to• Commercial fishing• Dredging• Mining and waste disposal
• Core zone• No human activity allowed
• Less harmful activities allowed• E.g., recreational boating and shipping
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Establishing a Global Network of Marine Reserves: An Ecosystem Approach
Fully protected marine reserves work fast• Fish populations double• Fish size grows• Reproduction triples• Species diversity increase by almost one-
fourth
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An Atoll of Australia’s Great Barrier Reef
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11.3
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11-3 How Should We Manage and Sustain Marine Fisheries?
Concept 11-3 Sustaining marine fisheries will require improved monitoring of fish populations, cooperative fisheries management among communities and nations, reduction of fishing subsidies, and careful consumer choices in seafood markets.
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Estimating and Monitoring Fishery Populations Is the First Step
Maximum sustained yield (MSY): traditional approach; maximum amount of fish that can be harvested annually without causing a population drop• Difficult to estimate population size and
growth rate
Optimum sustained yield (OSY): takes into account interactions among species
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Estimating and Monitoring Fishery Populations Is the First Step
Multispecies management: also incorporates competitive and predator-prey interactions
Large marine systems: using large complex computer models
**Precautionary principle: sharply reducing fish harvest and closing some overfished areas until they recover • Need more information about what
levels of fishing can be sustained
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Government Subsidies Can Encourage Overfishing
2007: World Trade Organization, U.S.• Proposed a ban on fishing subsidies
Reduce illegal fishing on the high seas and in coastal waters • Close ports and markets to such fishers• Check authenticity of ship flags• Prosecution of offenders
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Some Countries Use the Marketplace to Control Overfishing
Individual transfer rights (ITRs) • Control access to fisheries • Government gives each fishing vessel
owner a specified percentage of total allowable catch (TAC) for a give year• New Zealand and Iceland• Difficult to enforce
Problems with the ITR approach• Illegally exceeding quotas• Difficult to enforce
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Consumer Choices Can Help to Sustain Fisheries and Aquatic Biodiversity
1997: Marine Stewardship Council (MSC), London• Supports sustainable fishing• Certifies sustainably produced seafood
Manage global fisheries more sustainably• Individuals• Organizations• Governments
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Solutions: Managing Fisheries
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Video Clip
Strange Days on Planet Earth: Baboons
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11.4
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11-4 How Should We Protect and Sustain Wetlands?
Concept 11-4 To maintain the ecological and economic services of wetlands, we must maximize preservation of remaining wetlands and restoration of degraded and destroyed wetlands.
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Coastal and Inland Wetlands Are Disappearing around the World
Highly productive wetlands
Provide natural flood and erosion control
Maintain high water quality; natural filters
Effect of rising sea levels
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We Can Preserve and Restore Wetlands
Laws for protection
Mitigation banking• Ecologists argue this as a last resort
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Natural Capital Restoration: Wetland Restoration in Canada
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Individuals Matter: Restoring a Wetland
Jim Callender: 1982
Scientific knowledge + hard work =a restored wetland in California, U.S.
Marsh used again by migratory fowl
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Case Study: Can We Restore the Florida Everglades? (1)
“River of Grass”: south Florida, U.S.
Since 1948: damaged• Drained • Diverted• Paved over• Nutrient pollution from agriculture• Invasive plant species
1947: Everglades National Park unsuccessful protection project
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Case Study: Can We Restore the Florida Everglades? (2)
1970s: political haggling
1990: Comprehensive Everglades Restoration Plan (CERP)• Restore the curving flow of most of the
Kissimmee River• Remove canals and levees in strategic
locations• Flood 240 sq. km farmland to create
artificial marshes• Goal?
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Case Study: Can We Restore the Florida Everglades? (3)
Comprehensive Everglades Restoration Plan (CERP) cont…• Create reservoirs and underground water
storage areas • Build new canals, reservoirs and efficient
pumping systems
Why isn’t this plan working?
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The World’s Largest Restoration Project
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11-5 How Can Protect and Sustain Freshwater Lakes, Rivers, and Fisheries?
Concept 11-5 Freshwater ecosystems are strongly affected by human activities on adjacent lands, and protecting these ecosystems must include protection of their watersheds.
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Freshwater Ecosystems Are under Major Threats
Think: HIPPCO
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Case Study: Can the Great Lakes Survive Repeated Invasions by Alien Species?
Collectively, world’s largest body of freshwater
Invaded by at least 162 nonnative species• Sea lamprey• Zebra mussel• Good and bad
• Quagga mussel• Asian carp
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Zebra Mussels Attached to a Water Current Meter in Lake Michigan, U.S.
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Managing River Basins Is Complex and Controversial
Columbia River: U.S. and Canada• Dam system• Pros and cons
Snake River: Washington state, U.S. • Hydroelectric dams • Pros and cons
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Natural Capital: Ecological Services of Rivers
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We Can Protect Freshwater Ecosystems by Protecting Watersheds
Freshwater ecosystems protected through• Laws• Economic incentives• Restoration efforts
Wild rivers and scenic rivers
Sustainable management of freshwater fishes
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Video: Salmon swimming upstream
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11-6 What Are the Priorities for Sustained Biodiversity, Ecosystem Services?
Concept 11-6 Sustaining the world’s biodiversity and ecosystem services will require mapping terrestrial and aquatic biodiversity, maximizing protection of undeveloped terrestrial and aquatic areas, and carrying out ecological restoration projects worldwide.
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We Need to Set Priorities for Protecting Biodiversity, Ecosystem Services
2002: Edward O. Wilson• Complete the mapping of the world’s
terrestrial and aquatic biodiversity• Keep old-growth forests intact; cease their
logging• Identify and preserve hotspots and
deteriorating ecosystem services that threaten life
• Ecological restoration projects• Make conservation financially rewarding