Biodiversity and Conservation

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Biodiversity and Conservation. Levels of Biodiversity. Humans are reducing Earth ’ s diversity of life Biodiversity – sum total of all organisms in an area Split into three specific levels: Species diversity Genetic diversity Ecosystem diversity. Species Diversity.
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Biodiversity and ConservationLevels of Biodiversity
  • Humans are reducing Earth’s diversity of life
  • Biodiversity – sum total of all organisms in an area
  • Split into three specific levels:
  • Species diversity
  • Genetic diversity
  • Ecosystem diversity
  • Species Diversity
  • Species Diversity = the number or variety of species in the world or in a particular region
  • Richness = the number of species
  • Evenness or relative abundance = extent to which numbers of individuals of different species are equal or skewed
  • Speciation generates new species and adds to species richness
  • Extinction reduces species richness
  • TaxonomyTaxonomists = scientists who classify speciesPhysical appearance and genetics determines a speciesGenera = related species are grouped togetherFamilies = groups of generaEvery species has a two-part scientific name: genus and speciesSiberian tiger = PantheratigrisaltaicaSubspecies
  • Subspecies = populations of species that occur in different areas and differ slightly from each other
  • Divergence stops short of separating the species
  • Subspecies are denoted with a third part of the scientific name
  • Bengal tiger = PantheratigristigrisGenetic Diversity
  • Encompasses the differences in DNA among individuals within species and populations
  • The raw material for adaptation to local conditions
  • Populations with higher genetic diversity can survive
  • They can cope with environmental change
  • Populations with low genetic diversity are vulnerable
  • To environmental change
  • Disease
  • Inbreeding depression = genetically similar parents mate and produce inferior offspring
  • Diversity
  • Ecosystem diversity = the number and variety of ecosystems
  • Also encompasses differing communities and habitats
  • Rapid vegetation change and varying landscapes within an ecosystem promote higher levels of biodiversity
  • Diversity
  • Species are not evenly distributed among taxonomic groups
  • Insects predominate over all other life-forms
  • 40% of all insects are beetles
  • Groups accumulate species by
  • Adaptive radiation
  • Allopatric speciation (species isolation)
  • Low rates of extinction
  • Review Evolution
  • Microevolution, macroevolution, natural selection, artificial selection, fitness, adaptation, niche, mutation, sympatric vs. allopatric speciation, bottleneck, founder effects.
  • Measuring Biodiversity
  • Out of the estimated 3 - 100 million species on Earth, only 1.7 - 2 million species have been successfully catalogued
  • Very difficult to identify species
  • Many remote spots on Earth remain unexplored
  • Small organisms are easily overlooked
  • Many species look identical until thoroughly examined
  • Entomologist Terry Erwin found 163 beetle species specialized on one tree species
  • Refer to lab and Simpson’s Index
  • Biodiversity is not evenly distributed
  • Living things are distributed unevenly across Earth
  • Latitudinal gradient = species richness increases towards the equator
  • Canada has 30 - 100 species of breeding birds, while Costa Rica has more than 600 species
  • Latitude Gradient and BiodiversityLoss of Species
  • Extinction = occurs when the last member of a species dies and the species ceases to exist
  • Extirpation = the disappearance of a particular population from a given area, but not the entire species globally
  • Can lead to extinction
  • Extinction is a natural process
  • Paleontologists estimate 99% of all species that ever lived are now extinct
  • Background rate of extinction = natural extinctions for a variety of reasons
  • 1 extinction per 1 to 10 million species for mammals and marine species
  • 1 species out of 1,000 mammal and marine species would go extinct every 1,000 to 10,000 years
  • Endangered and Extinct SpeciesCould become extinct soon.Population declining very fast.Endangered and Threatened SpeciesThreatenedEndangeredSpectacled BearEndangered and Extinct Species
  • Characteristics of Endangered Species
  • Extremely small range
  • Requiring large territories
  • Living on islands
  • Low reproductive success
  • Specialized breeding areas
  • Specialized feeding habits
  • Tiburon mariposa lilyCalifornia condorHawaii ‘O’ oBlue whaleGreen sea turtleGiant pandaEndangered and Extinct Species
  • Most Impacted areas
  • Hawaii and other island habitats
  • Tropical rain forests
  • http://www.pbs.org/wnet/nature/episodes/the-dragon-chronicles/video-komodo-dragon-chases-rom/4520/
  • Past Mass Extinctions
  • In the past 440 million years, mass extinctions have eliminated at least 50% of all species
  • After every mass extinction the biodiversity returned to or exceeded its original state
  • Current Mass Extinction is Human Caused
  • During this Quaternary period, we may lose more than half of all species
  • Hundreds of human-induced species extinctions, and multitudes of others, teeter on the brink of extinction
  • The current global extinction rate is 100 to 1,000 times greater than the background rate
  • This rate will increase tenfold in future decades due to human population growth and resource consumption
  • Loss of Biodiversity is more than extinction
  • Decreasing numbers are accompanied by smaller species’ geographic ranges
  • Genetic, ecosystem, and species diversity are being lost.
  • The Living Planet Index summarizes trends in populations
  • Between 1970 and 2003, the Index fell by 30%
  • Causes of Biodiversity Loss
  • Reasons for biodiversity losses are multifaceted, complex, and hard to determine
  • Factors may interact synergistically
  • Four primary causes of population decline are:
  • Habitat alteration
  • Invasive species
  • Pollution
  • Overharvesting
  • Global climate change now is the fifth cause
  • Habitat Loss
  • The greatest cause of biodiversity loss
  • Farming simplifies communities
  • Grazing modifies the grassland structure and species composition
  • Clearing forests removes resources organisms need
  • Hydroelectric dams turn rivers into reservoirs upstream
  • Urbanization and suburban sprawl reduce natural communities
  • A few species (i.e., pigeons, rats) benefit from changing habitats
  • Invasive Species
  • Introduction of non-native species to new environments
  • Accidental: zebra mussels
  • Deliberate: food crops
  • Island species are especially vulnerable
  • Invaders have no natural predators, competitors, or parasites
  • Cost billions of dollars in economic damage
  • Pollution
  • Harms organisms in many ways
  • Air pollution degrades forest ecosystems
  • Water pollution adversely affects fish and amphibians
  • Agricultural runoff harms terrestrial and aquatic species
  • The effects of oil and chemical spills on wildlife are dramatic and well known
  • The damage to wildlife and ecosystems caused by pollution can be severe
  • But it tends to be less than the damage caused by habitat alteration or invasive species
  • Overharvesting
  • Vulnerable species are large, few in number, long-lived, and have few young (K-selected species)
  • The Siberian tiger is hunted without rules and regulations
  • The early 1990s saw increased poaching because of powerful economic incentives
  • Many other species affected: Atlantic gray whale, sharks, gorillas
  • Today the oceans contain only 10% of the large animals they once didClimate Change
  • Emissions of greenhouse gases warms temperatures
  • Modifies global weather patterns and increases the frequency of extreme weather events
  • Increases stress on populations and forces organisms to shift their geographic ranges
  • Most animals and plants will not be able to cope
  • Biodiversity is good for ecosystems (ecosystem services)
  • Provides food, shelter, fuel
  • Purifies air and water, and detoxifies wastes
  • Stabilizes climate, moderates floods, droughts, wind, temperature
  • Generates and renews soil fertility and cycles nutrients
  • Pollinates plants and controls pests and disease
  • Maintains genetic resources
  • Provides cultural and aesthetic benefits
  • Allows us to adapt to change
  • Biodiversity Loss in an Ecosystem
  • Biodiversity increases the stability and resilience of communities and ecosystems
  • Decreased biodiversity reduces a natural systems ability to function and provide services to our society
  • The loss of a species affects ecosystems differently
  • If the species can be functionally replaced by others, it may make little difference
  • Extinction of a keystone species may cause other species to decline or disappear
  • “To keep every cog and wheel is the first precaution of intelligent tinkering” (Aldo Leopold)
  • Biodiversity affects food security
  • Genetic diversity within crops is enormously valuable
  • Turkey’s wheat crops received $50 billion worth of disease resistance from wild wheat
  • Wild strains provide disease resistance and have the ability to grow back year after year without being replanted
  • Biodiversity and Medicines
  • Each year pharmaceutical products owing their origin to wild species generate up to $150 billion in sales
  • The rosy periwinkle produces compounds that treat Hodgkin's disease and leukemia
  • Some economic benefits of biodiversity
  • People like to experience protected natural areas, creating economic opportunities for residents, particularly in developing countries
  • Costa Rica: rainforests (Excellent at ecotourism)
  • Australia: Great Barrier Reef
  • Belize: reefs, caves, and rainforests
  • A powerful incentive to preserve natural areas and reduce impacts on the landscape and on native species
  • But, too many visitors to natural areas can degrade the outdoor experience and disturb wildlife
  • People Value and seek nature
  • Biophilia = connections that humans subconsciously seek with life
  • Our affinity for parks and wildlife
  • Keeping of pets
  • High value of real estate with views of natural lands
  • Nature deficit disorder = alienation from the natural environment
  • May be behind the emotional and physical problems of the young
  • Conservation Biology
  • Conservation biology = devoted to understanding the factors that influence the loss, protection, and restoration of biodiversity
  • Arose as scientists became alarmed at the degradation of natural systems
  • An applied and goal-oriented science
  • Conservation Biology
  • Conservation biologists integrate evolution and extinction with ecology and environmental systems
  • Design, test, and implement ways to mitigate human impacts
  • Conservation geneticists = study genetic attributes of organisms to infer the status of their population
  • Minimum viable population = how small a population can become before it runs into problems
  • Metapopulations = a network of subpopulations
  • Small populations are most vulnerable to extinction and need special attention
  • Should we focus on endangered species?
  • Endangered Species Act (1973) (ESA) = forbids the government and private citizens from taking actions that destroy endangered species or their habitats-40 Year anniversary!
  • To prevent extinction
  • Stabilize declining populations
  • Enable populations to recover
  • US has approximately 2050 endangered species.
  • http://www.fws.gov/endangered/
  • http://www.nmfs.noaa.gov/pr/laws/esa/
  • ESA
  • Through federal action and by encouraging the establishment of state programs, the 1973 Endangered Species Act provided for the conservation of ecosystems upon which threatened and endangered species of fish, wildlife, and plants depend. The Act:
  • authorizes the determination and listing of species as endangered and threatened;
  • prohibits unauthorized taking, possession, sale, and transport of endangered species;
  • provides authority to acquire land for the conservation of listed species, using land and water conservation funds;
  • authorizes establishment of cooperative agreements and grants-in-aid to States that establish and maintain active and adequate programs for endangered and threatened wildlife and plants;
  • authorizes the assessment of civil and criminal penalties for violating the Act or regulations; and
  • authorizes the payment of rewards to anyone furnishing information leading to arrest and conviction for any violation of the Act or any regulation issued thereunder.
  • Amendments to ESA
  • Habitat Conservation Plans
  • 1982 amendment to ESA
  • Landowner allowed to set aside land for endangered species, but develop other land with those species
  • Successes
  • Peregrine falcons, brown pelicans, bald eagles, and others have recovered and are no longer listed
  • Intensive management has stabilized other species
  • The red-cockaded woodpecker
  • 40% of declining populations are now stable
  • These successes occur despite underfunding of the U.S. Fish and Wildlife Service and the National Marine Fisheries Service
  • In recent years, political forces have attempted to weaken the ESA
  • http://www.pbs.org/wnet/nature/episodes/american-eagle/video-full-episode/4349/
  • Ways to preserve biodiversity
  • Captive breeding – individuals are bred and raised with the intent of reintroducing them into the wild
  • Zoos and botanical gardens
  • Some reintroductions are controversial
  • Ranchers opposed the reintroduction of wolves to Yellowstone National Park
  • Some habitat is so fragmented, a species cannot survive
  • Seed Banks
  • Cloning????
  • Cloning – a technique to create more individuals and save species from extinction
  • Most biologists agree that these efforts are not adequate to recreate the lost biodiversity
  • Ample habitat and protection in the wild are needed to save species
  • Jurassic Park 
  • Strategies
  • Conservation biologists use particular species as tools to conserve communities and ecosystems
  • Protecting the habitat of these umbrella species helps protect less-charismatic animals that would not have generated public interest
  • Flagship species – large and charismatic species used as spearheads for biodiversity conservation
  • The World Wildlife Fund’s panda bear
  • Some organizations are moving beyond the single species approach to focus on whole landscapes
  • International Conservation
  • UN Convention on International Trade in Endangered Species of Wild Fauna and Flora (1973) (CITES) – protects endangered species by banning international transport of their body parts
  • Convention on Biological Diversity (1992) –
  • Seeks to conserve biodiversity
  • Use biodiversity in a sustainable manner
  • Ensure the fair distribution of biodiversity’s benefits
  • By 2007, 188 nations had signed on
  • Iraq, Somalia, the Vatican, and the U.S. did not join
  • Hot spots
  • Biodiversity hotspots – prioritizes regions most important globally for biodiversity
  • Support a great number of endemic species = species found nowhere else in the world
  • The area must have at least 1.500 endemic plant species (0.5% of the world total)
  • It must have lost 70% of its habitat due to human impact
  • 2.3% of the planet’s land surface contains 50% of the world’s plant species and 42% of all terrestrial vertebrate speciesCommunity Based Conservation
  • Protecting habitats makes good sense, but this affects people living in and near these areas
  • Community-based conservation = conservation biologists actively engage local people in protecting land and wildlife
  • Protecting land deprives people access to resources
  • But, it can guarantee that these resources will not be used up or sold to foreign corporations and can instead be sustainably managed
  • Many projects have succeeded
  • But, others have not, due mainly to funding problems
  • Economic Incentives
  • Debt-for-nature swap = a conservation organization pays off a portion of a developing country’s international debt
  • In exchange for a promise by the country to set aside reserves
  • Fund environmental education, and
  • Better manage protected areas
  • Conservation concession = conservation organizations pay nations to conserve, and not sell, resources
  • Costa Rica and Debt Swap
  • Under the U.S. Tropical Forest Conservation Act, the United States agreed to forgive $26 million of Costa Rica’s debt in return for the Central American nation’s commitment to redirect that money toward conservation inside its borders. The U.S. government appropriated $12.6 million for the effort. Both Conservation International (CI) and The Nature Conservancy each gave $1.26 million to the debt purchase at a discounted rate.
  • Wildlife management
  • Differs from conservation biology in that wildlife managers focus more often on common organisms and manage those species primarily for human benefits
  • Management of Aquatic Organisms
  • Freshwater fisheries primarily managed by state fishing regulations
  • Ocean fisheries commonly viewed as common property-this has lead many species close to commercial extinction
  • Case Studies and FYI
  • Sharks-32% of the world’s open-ocean species are threatened. They are keystone species and can potential help cancer research.
  • E. O. Wilson-Champion of Biodiversity
  • Vanishing Amphibians-an indicator Species.
  • Go to the media centers website and log onto discovery education-search Vanishing Frogs for a documentary
  • Polar Bears and Climate Change
  • Elephants in Africa
  • Black Rhinos and Poaching
  • Kudzu, zebra mussels, termites, gypsy moths, Cane toads http://www.youtube.com/watch?v=4mvV8OT-mmE (don’t know if you can get this at school)
  • Birds of Thailand
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