ch4 - biodiversity and evolution - ftsapes's blog · biodiversity and evolution chapter 4....
TRANSCRIPT
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Biodiversity and Evolution
Chapter 4
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Core Case Study: Why Should We Care about the American Alligator?
� Largest reptile in North America
� 1930s: Hunters and poachers
� Importance of gator holes and nesting mounds
� 1967: endangered species
� 1977: comeback, threatened species
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The American Alligator
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4-1 What Is Biodiversity and Why Is It Important?
� Concept 4-1 The biodiversity found in genes,
species, ecosystems, and ecosystem processes
is vital to sustaining life on earth.
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Biodiversity Is a Crucial Part of the Earth’s Natural Capital
� Vital renewable resource
� Species diversity
� Ecosystem diversity
� Functional diversity
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Natural Capital: Major Components of the Earth’s Biodiversity
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Animation: Evolutionary tree of life
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Active Figure: Matter recycling and energy flow
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Video: Frogs galore
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4-2 Where Do Species Come From?
� Concept 4-2A The scientific theory of evolution
explains how life on earth changes over time
through changes in the genes of populations.
� Concept 4-2B Populations evolve when genes � Concept 4-2B Populations evolve when genes
mutate and give some individuals genetic traits
that enhance their abilities to survive and to
produce offspring with these traits (natural
selection).
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Biological Evolution by Natural Selection Explains How Life Changes over Time
� Biological evolution
� Natural selection
• Charles Darwin
• Alfred Russel Wallace
� Tree of Life
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Six Major Kingdoms of Species as a Result of Natural Selection
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CenozoicMesozoic
Paleozoic
Mil
lio
ns
of
ye
ars
ag
oFirst humansExtinction of dinosaurs
Plantscolonize land
Origin ofmulticellularorganisms
Oldesteukaryotic fossils
Prokaryotes Eukaryotes
AnimalsFungiPlantsProtistsArchaebacteriaEubacteria
0
500
2,000
1,500
1,000
Fig. 4-3, p. 81
Precambrian
Mil
lio
ns
of
ye
ars
ag
o
Accumulation ofO2 in atmospherefrom photosyntheticcyanobacterium
Origin of Earth
Earth cool enoughfor crust to solidify
Oldest prokaryoticfossils
4,500
4,000
3,500
3,000
2,500
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The Fossil Record Tells Much of the Story of Evolution
� Fossils
• Physical evidence of ancient organisms
• Reveal what their internal structures looked
like
� Fossil record is incomplete: why?
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Fossilized Skeleton of an Herbivore that Lived during the Cenozoic Era
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The Genetic Makeup of a Population Can Change
� Populations evolve by becoming genetically
different
� Genetic variations
• First step in biological evolution
• Occurs through mutations in reproductive cells
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Individuals in Populations with Beneficial Genetic Traits Can Leave More Offspring
� Natural selection: acts on individuals
• Second step in biological evolution
• Adaptation may lead to differential reproduction
• Genetic resistance
� When environmental conditions change,
populations
• Adapt
• Migrate
• Become extinct
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Evolution by Natural Selection
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A group of bacteria, including genetically resistant ones, areexposed to an antibiotic
Most of the normal bacteria die
The genetically resistant bacteriastart multiplying
Eventually the resistant strainreplaces the strain affected bythe antibiotic
Fig. 4-5, p. 83
Normal bacterium
Resistant bacterium
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Most of the normal bacteria die
The genetically resistant bacteriastart multiplying
Eventually the resistant strainreplaces the strain affected bythe antibiotic
A group of bacteria, including genetically resistant ones, areexposed to an antibiotic
Fig. 4-5, p. 83
Normal bacterium
Resistant bacterium
Stepped Art
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Case Study: How Did Humans Become Such a Powerful Species?
� Three human adaptations
• Strong opposable thumbs
• Walk upright
• Complex brain
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Adaptation through Natural Selection Has Limits
� Genetic change must precede change in the
environmental conditions
� Reproductive capacity
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Three Common Myths about Evolution through Natural Selection
� “Survival of the fittest” is not “survival of the
strongest”
� Organisms do not develop traits out of need or
wantwant
� No grand plan of nature for perfect adaptation
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Animation: Adaptive trait
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Animation: Modeling genetic drift
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Animation: Disruptive selection
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Animation: Evolutionary tree diagrams
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Animation: Change in moth population
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Animation: Stabilizing selection
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Video: Dinosaur discovery
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4-3 How Do Geological Processes and Climate Change Affect Evolution?
� Concept 4-3 Tectonic plate movements,
volcanic eruptions, earthquakes, and climate
change have shifted wildlife habitats, wiped out
large numbers of species, and created
opportunities for the evolution of new species. opportunities for the evolution of new species.
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Geologic Processes Affect Natural Selection
� Tectonic plates affect evolution and the location
of life on earth
• Location of continents and oceans
• Species physically move, or adapt, or form new species through natural selectionspecies through natural selection
� Earthquakes
� Volcanic eruptions
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Movement of the Earth’s Continents over Millions of Years
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225 million years ago 135 million years ago
Fig. 4-6, p. 85
65 million years ago Present
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225 million years ago 135 million years ago
Fig. 4-6, p. 85
65 million years ago Present
Stepped Art
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Climate Change and Catastrophes Affect Natural Selection
� Ice ages followed by warming temperatures
� Collisions between the earth and large asteroids
• New species
• Extinction
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Changes in Ice Coverage in the Northern Hemisphere During the last 18,000 Years
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18,000years beforepresent
Modern day(August)
Northern HemisphereIce coverage
Fig. 4-7, p. 85
Legend
Continental ice
Sea ice
Land above sea level
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Science Focus: Earth Is Just Right for Life to Thrive
� Certain temperature range
� Dependence on water
� Rotation on its axis
� Revolution around the sun
� Enough gravitational mass
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Animation: Continental drift
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Animation: Stanley Miller's experiment
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4-4 How Do Speciation, Extinction, and Human Activities Affect Biodiversity?
� Concept 4-4A As environmental conditions
change, the balance between formation of new
species and extinction of existing species
determines the earth’s biodiversity.
� Concept 4-4B Human activities can decrease
biodiversity by causing the premature extinction
of species and by destroying or degrading
habitats needed for the development of new
species.
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How Do New Species Evolve?
� Geographic isolation
� Reproductive isolation
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Geographic Isolation Can Lead to Reproductive Isolation
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Early foxpopulation
Spreads northand southand separates
Northernpopulation
Different environmentalconditions lead to different
Arctic Fox Adapted to coldthrough heavier fur,short ears, short legs,and short nose. Whitefur matches snow forcamouflage.
Fig. 4-8, p. 87
Southernpopulation
populationand separates
Adapted to heatthrough lightweightfur and long ears,legs, and nose, which give off more heat.
selective pressures and evolutioninto two different species.
Gray Fox
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Extinction is Forever
� Extinction
� Endemic species
• Particularly vulnerable
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Golden Toad of Costa Rica, Extinct
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Extinction Can Affect One Species or Many Species at a Time
� Background extinction
� Mass extinction
• How numbered is debated: 3–5
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Science Focus: We Have Two Ways to Change the Genetic Traits of Populations
� Artificial selection
� Genetic engineering, gene splicing
� Consider
• Ethics
• Morals
• Privacy issues
• Harmful effects
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Genetically Engineered Mice
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Animation: Speciation on an archipelago
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Animation: Transferring genes into plants
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Video: Cloned pooch
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Video: Creation vs. evolution
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4-5 What Is Species Diversity and Why Is It Important?
� Concept 4-5 Species diversity is a major
component of biodiversity and tends to increase
the sustainability of ecosystems.
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Species Diversity: Variety, Abundance of Species in a Particular Place
� Species diversity
• Species richness
• Species evenness
� Diversity varies with geographical location
• Most species-rich communities
• Tropical rain forests
• Coral reefs
• Ocean bottom zone
• Large tropical lakes
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Variations in Species Richness and Species Evenness
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Science Focus: Species Richness on Islands
� Species equilibrium model, theory of island biogeography
• Rate of new species immigrating should balance with the rate of species extinction
� Island size and distance from the mainland need
to be considered
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Species-Rich Ecosystems Tend to Be Productive and Sustainable
� Species richness seems to increase productivity
and stability or sustainability
� How much species richness is needed is
debatabledebatable
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4-6 What Roles Do Species Play in Ecosystems?
� Concept 4-6A Each species plays a specific
ecological role called its niche.
� Concept 4-6B Any given species may play one
or more of five important roles—native, or more of five important roles—native,
nonnative, indicator, keystone, or foundation
roles—in a particular ecosystem.
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Each Species Plays a Unique Role in Its Ecosystem
� Ecological niche, niche
• Pattern of living
� Generalist species
• Broad niche
� Specialist species
• Narrow niche
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Specialist Species and Generalist Species Niches
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Nu
mb
er
of
ind
ivid
uals
Specialist specieswith a narrow niche
Nicheseparation
Generalist specieswith a broad niche
Fig. 4-11, p. 91
Nu
mb
er
of
ind
ivid
uals
Resource use
Region ofniche overlap
Nichebreadth
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Case Study: Cockroaches: Nature’s Ultimate Survivors
� Cockroaches
• Generalists
• High reproductive rates
� Giant panda and tiger salamanders
• Specialists
• Low reproductive rates
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Cockroach
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Specialized Feeding Niches of Various Bird Species in a Coastal Wetland
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Black skimmerseizes small fishat water surfaceBlack skimmerseizes small fishat water surface
Brown pelican divesfor fish, which itlocates from the air
Avocet sweeps billthrough mud andsurface water in searchof small crustaceans,insects, and seeds
Dowitcher probesdeeply into mud insearch of snails,marine worms, andsmall crustaceans Herring gull
is a tirelessscavenger
Ruddy turnstonesearches undershells and pebblesfor smallinvertebrates
Fig. 4-13, p. 93
Flamingo feeds on minute organisms in mud
Scaup and other diving ducks feed on mollusks, crustaceans, and aquatic vegetation
Louisiana heron wades into water to seize small fish
Oystercatcher feeds on clams, mussels, and other shellfish into which it pries its narrow beak
Knot (sandpiper)picks up wormsand small crustaceansleft by receding tide
Piping plover feeds on insects and tinycrustaceans on sandy beaches
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Niches Can Be Occupied by Native and Nonnative Species
� Native species
� Nonnative species; invasive, alien, or exotic
species
• May spread rapidly
• Not all are villains
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Indicator Species Serve as Biological Smoke Alarms
� Indicator species
• Can monitor environmental quality
• Trout
• Birds
• Butterflies• Butterflies
• Frogs
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Case Study: Why Are Amphibians Vanishing? (1)
� Habitat loss and fragmentation
� Prolonged drought
� Pollution
� Increase in UV radiation� Increase in UV radiation
� Parasites
� Viral and fungal diseases
� Climate change
� Overhunting
� Nonnative predators and competitors
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Case Study: Why Are Amphibians Vanishing? (2)
� Importance of amphibians
• Sensitive biological indicators of environmental changes
• Adult amphibians
• Important ecological roles in biological • Important ecological roles in biological
communities
• Genetic storehouse of pharmaceutical products waiting to be discovered
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Life Cycle of a Frog
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Adult frog(3 years) Young frog
Tadpole developsinto frog
Sperm
Fig. 4-14, p. 94
Sexualreproduction
Tadpole developsinto frog
Tadpole
Egg hatches
Organ formation
Fertilized eggdevelopment
Eggs
Sperm
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Keystone, Foundation Species Determine Structure, Function of Their Ecosystems
� Keystone species
• Pollinators
• Top predator
� Foundation species
• Create or enhance their habitats, which benefit others
• Elephants
• Beavers
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Case Study: Why Should We Protect Sharks?
� Keystone species
• Eat dead and dying fish in the ocean
• Strong immune systems
• Wounds do not get infected
• Almost never get cancer• Almost never get cancer
• Could help humans if we understood their immune
system