chapter 5
DESCRIPTION
APES Chapter 5TRANSCRIPT
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1.25.13
• Test on Tuesday
• Quizlet due Tuesday
• Homework: Read 5.2, 5.3, 5.4
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Review
• Describe the processes that create a rain shadow
• On a map identify regions of the globe that are affected by rain shadows
• Explain how abiotic conditions determine the characteristics of a biome
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Chapter 5Evolution of Biodiversity
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Objectives
• Describe the importance of biodiversity.
• Differentiate between species richness and species evenness.
• Utilize Shannon’s index to calculate species diversity.
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Question
• Why does a healthy lawn need 4 types of grass?
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Levels of Biodiversity
• Does anyone recall the 3 levels of biodiversity?
• Ecosystem
• Species
• Genetic
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Levels of Biodiversity
• In general, will greater biodiversity be found on tended land or untended land?
• Why?
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Levels of Biodiversity
• Of the three levels of biodiversity, which one ultimately determines the other two?
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Richness vs. Evenness
• Why is the number of species on earth not a useful indicator of local or regional diversity?
• Species aren’t distributed evenly over the face of the earth.
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Richness vs. Evenness
• If you had to define SPECIES RICHNESS vs. SPECIES EVENNESS, how would you do it?
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Richness vs. Evenness
• Richness: The number of species in a given area
• Gives a sense of the biodiversity in an area
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Richness vs. Evenness
• Evenness: Relative proportions of individuals within the different species
• Are there equal numbers of many species?
• Is the area dominated by one species?
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Richness vs. Evenness
• High Evenness
• All species have a relatively equal number of individuals
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Richness vs. Evenness
• Low evenness
• One species has many individuals
• Other species have only a few
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Richness vs. Evenness
• Could an ecosystem have low evenness and still be rich?
• If two areas have the same richness ...
• The more even ecosystem is considered more diverse
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Shannon’s Index
• Used to calculate the biodiversity present in an area
• H = -∑ pi ln (pi)
• Shannon’s Index = [(% A X (ln % A)) + (% B X (ln % B))]
• Example: 3 Species: Species A 75%, Species B 15%, Species C 10%
• Calculate the Shannon’s Index for each sample on the next slide
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Sample 1 Sample II Sample III
Species A 24 48 24
Species B 20 40 20
Species C 7 14 7
Species D 3 6 3
Species E 3
Species F 1
Index
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Sample 1 Sample II Sample III
Species A 24 48 24
Species B 20 40 20
Species C 7 14 7
Species D 3 6 3
Species E 3
Species F 1
Index 1.15 1.15 1.36
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Why is BD Important
• Get out a sheet of paper
• Write a D on the top of your paper
• Walk around and write down the names of 3 people
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Why is BD Important
• Everyone remain standing
• I am the disease
• When your name is called sit down
• How many are left standing?
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Why is BD Important
• 2 D
• N - Noble Fir
• C - Western Cedar
• M - Vine maple
• H- Hemlock
• W - Fir
• L - Pine
• WP - White Pine
• B - Bigleaf Maple
• WD - Dogwood
• 2-3 of each tree
• Repeat walk around
• Debrief questions
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Agenda
• Garbage Patch projects due Tuesday
• Should have completed packet reading
• Completed lab will be due next Friday
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Reading Quiz
• Name 1 way in which evolution occurs
• How are artificial and natural selection alike, how are they different?
• How does evolution lead to biodiversity?
• How does geographic isolation lead to reproductive isolation?
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Objectives
• calculate diversity values for sampled habitats, using three indices: species richness, Shannon-Wiener, and Simpson’s
• Explain trade-offs involved in establishing biodiversity reserves.
• Understand rationales for maintaining biodiversity when possible.
• Understand subtle differences between the different ways of measuring and defining biodiversity
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Berlese Funnels
• What are some possible reasons for low microarthropod captures?
• How could the experiment be altered to obtain better data?
• Use hand lenses and dissecting scopes to determine if you have anything in your alcohol
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Schedule
• Go outside and collect sticky traps
• Come inside and begin to crunch data
• Look at photos from yesterday
• Analyze trap catches and gather data
• Work through Berlese Funnel catches
• Start questions
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Agenda
• Hope you turned in your garbage patch work
• Chapter 4 and 5 test tomorrow
• Lab due Friday
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Objectives
• Explain the terms fundamental niche, realized niche, niche generalist, and niche specialist.
• Relate environmental change to species distribution.
• Compare and contrast major mass extinctions
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Question
• Is it better to be mediocre at many things or excellent at one thing?
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Niches
• How would you define Range of Tolerance?
• The minimum and maximum amount of any factor that an organism can handle
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Niches
• Range of Tolerance
• At either end of the spectrum an organism may survive but not thrive.
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Niches
• Fundamental Niche
• The combination of all ideal conditions for an organism
• Determined by abiotic factors
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Niches
• How could biotic conditions limit a species range or survival?
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Niches
• Realized Niche
• The combination of biotic and abiotic conditions under which an organism survives
• Once realized niche is determined distribution can be understood.
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Niches
• Some species can thrive under a wide variety of environmental conditions.
• Large Realized Niche
• Known as NICHE GENERALISTS
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Niches
• Some species can only thrive only under a very small set of conditions.
• Small realized niche
• Known as a NICHE SPECIALIST
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Niches
• Where do you think generalists are likely to be found?
• Specialists?
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Niches
• We’ve seen that environmental conditions determine what lives where.
• What do you think will happen if the environment changes?
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Climate Change
• Organisms follow the conditions.
• New areas are colonized by new species.
• How do you think this relates to disease transmission?
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Climate Change
• Malaria
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Extinction
• 99% of species that have ever lived are now extinct?
• How could environmental change lead to species extinction?
• No where to go.
• Polar Bears
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Extinction
• The fossil record shows 5 mass extinctions
• During the last mass extinction, 65 mya, 50% of species were killed by a meteorite impact.
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Extinction
• We are currently in the middle of the 6th mass extinction.
• How do you think this mass extinction is different from the others?