lo: to examine an evolutionary case and develop a claim ... · rough-skinned newt:...
TRANSCRIPT
LEVEL ZERO VOICECATALYST (4 minutes, individual work):
1. Define natural selectionProcess in which organisms that are better adapted to their environment survive to reproduce and organisms that are less adapted die (and don’t reproduce)
2. Explain how natural selection caused the finches to form new species.
AGENDA 4/20-4/21
1. Notes
2. Discussion
3. Video
4. Investigation
HOMEWORK
1. Synthesis (wait 1 day)
Assignment #8 Evolution in Action: SalamandersLO: To examine an evolutionary case and develop a claim and explain what drives evolution. EQ: What is driving the evolution of the species? Incorporate natural selection into answer. (4-5 sentences)
What is evolution?
The gradual process where different kinds of life change, diversify, develop
What causes evolution to occur?
Darwin's Theory of Evolution by Natural Selection• Variation: individuals in a population are different random DNA
mutations, sex• Heredity: variations are passed from one generation to another• Overproduction: more individuals in a population are produced
than can survive• Reproductive Advantage: certain traits make the individuals with
that trait more likely to survive
Niche
The “place” a species occupies in the world
including habitat, energy flow, interspecies
interaction
Speciation- The formation of new species through evolution
Two types: GradualBranching
Cladogram- Diagram that shows the
evolutionary relationships between
species
Salamanders
160mya to today(the ones we are studying are only 10mya)
Amphibian (370my-present): cold blood, tetrapod, lungs, require water to breed
Feeding: worms, flies, beetles, each otherTiger Salamander: cannibalism but not related individuals… why?
Sex: quiet and sexes look similar pheromones
Limb regeneration!
https://www.youtube.com/watch?v=byLDgtSMI0w
Coevolution: when species exert selective
pressures directly on each other.
Rough-skinned newt: Tetrodotoxin Could kill 20 people, 100’s of miceWhy?
Evolutionary arms race
Coevolution of newts video:https://youtu.be/-bVowxq8IVM
Coevolution examples: (write 2)
• Humans and cows
• Orchids and moths
• Newts and snakes
• Cheetah and gazelle
Coevolution explanation video:https://www.youtube.com/watch?v=QDVbt2qQRqs
Are these the same species?
What data would you collect to determine if they are the same or different species?
• Focus Question: Are the Ensatina salamanders one species with different varieties or several distinct species?
• Read This! The small salamanders of the genus Ensatina are strictly terrestrial. They even lay their eggs on land. Nevertheless, these lungless salamanders need a moist environment and do not thrive in arid regions. In California, the species is Ensatina eschscholtzii. This species of salamander also have various subspecies. A subspecies is a geographically restricted population that differs consistently from other populations of the same species. There is considerable variation in color patterns among the subspecies. Ensatina eschscholtzii has been studied by R.C. Stebbins at the University of California - Berkeley. Your investigation is based on that work.
• Task: Use field study data on Ensatina eschscholtzii to build a model that can be used to argue potential speciation.
Are the Ensastina salamanders one species with different variations or several distinct species?
Claim 1: The salamanders are one species with different variations.
Claim 2: The salamanders are becoming different species.
Claim 3: The salamanders are different species.
Claim 4: ?
1. Discuss each claim/hypothesis2. Complete you CA salamander population model3. Complete your investigation sheet4. Get approval from Klossner5. Get task card 2
Procedure if they get stuck:• Plot each collection area by filling in the
corresponding square on the California map grid.
• Color in the square above and to the left of the point where the specified grid coordinates cross. For example, the square in the upper left-hand corner is 1/A. Use the colors indicated for each subspecies population (listed above) to make a distribution map of Ensatina eschscholtzii in California.
Answer key for after Task Card 1, after first set of data
Make sure to paste in your pictures for morphology comparison
What are the limitations of your model?Model Quickwrite:
Endangered Salamander Quickwrite:According to the International Union for Conservation of Nature (IUCN),About half of all the world’s salamander species are listed as threatened
Why might salamanders be at risk?Should this be a concern?
Elaborate/Explain: Salamander Species Argumentgroup discussion
https://www.youtube.com/watch?v=aDIQFQOCGaI (the whole video now)
Your claim is just as valid as the scientists from UCB as long as you can support it and provide compelling reasoning.
LEVEL ZERO VOICEPROCESSING TASK (4 minutes, individual work):
Cl.Ev.Re.
Question: Are the Ensatina salamanders one species with different varieties or several distinct species?
3 lines of evidence/reasoning
AGENDA 4/20-4/21
1. Discussion
2. Video
3. Investigation
HOMEWORK
1. Synthesis (wait 1 day)
Assignment #8 Evolution in Action: SalamandersLO: To examine an evolutionary case and develop a claim and explain what drives evolution. EQ: What is driving the evolution of the species? Incorporate natural selection into answer. (4-5 sentences)