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Unit 4 Karen Cox

Delve into the vast array of species on Earth, from genetic differences and species richness to the critical role of ecosystems. Discover the significance of adaptations and the principles of natural selection with Charles Darwin's insights.

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Unit 4 Karen Cox

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  1. Unit 4 Karen Cox

  2. BiodiversityBio – Life Diversity - Different • How many species have been identified? • So far ONLY 1.75 million have been identified • Scientists estimate that 99.9% of all species that ever lived on earth are now extinct….! • What does that mean for the species that are currently thriving? • History of the Earth 10 min

  3. Scientists study 3 types of bioDIVERSITY • Genetic Diversity • Species Diversity • Ecosystem Diversity

  4. Genetic diversity • Genetic variation within a species, Increases chances of survival !

  5. Genetic Diversity

  6. Genetic diversity • Genetic variation within a species

  7. Genetic diversity

  8. Genetic Diversity • After looking at those pictures – explain HOW genetic diversity can lead to survival for a species?

  9. species diversity • The variety of species found in an ecosystem comprise that system's species diversity.

  10. Two components of species diversity:species richness - the number of different species in the communityrelative abundance - the proportion of the community represented by each species

  11. The two forest communities below have the same species richness (four species), but the relative abundance of the four species is different between the two communities.

  12. Ecosystem Diversity –Different Biomes

  13. PA BIOME • TEMPERATE DECIDUOUS FOREST

  14. Biodiversity is…. • The foundation for ecosystems stability… • All organisms have a niche (job) that keeps the world in balance.. (predator – prey, consumer, producer, scavenger…etc.) • Why so important? Ted Ed

  15. Linnaean Taxonomy • Example: human classification • DOMAIN Eukarya • Kingdom animalia • Phylum chordata • Class mammalia • Order primate • Family hominid • Genus homo • Species sapiens • Assignment – make up an acronym to remember the order above • Dumb Kids Playing Chicken on Freeways Get Smashed • Darn Kids Prefer Cheese Over Fried Green Spinach

  16. The environment is hostile, and survival is not easy….. So how do animals survive? This is one of the main ideas for this unit… write it down!

  17. WHAT IS AN ADAPTATION? Any characteristic that increases the chance for survival… • Why do you / they want to survive?...... To produce offspring.

  18. StructuralAdaptations • physical characteristics that help an animal survive…examples include: - shape of teeth - camo - nails - skin See pictures…..

  19. WHY ARE THEIR TEETH DIFFERENT?

  20. CAN YOU NAME ANY OTHER PHYSICAL ADAPTATIONS?

  21. Moth Mimicry • Video / worksheet • Video • Worksheet

  22. Mimicry – trying to look like another creature…vid 1 2

  23. If red touches black you’re ok jack - if red touches yellow you’re a dead fellow Coral vs milk snake

  24. Reflexive Adaptations • Behavior triggered automatically by outside stimulus….examples include: • Blink • Flinch • Responses to environment that help survival.

  25. Instinct • Behavior an organism carries out because it is genetically programmed to. • Courtship • Raising and protecting young • Build nests safe from predators How did these genetically programmed behaviors begin ( in relationship to survival)?

  26. birds • Peacock • Paradise • Part 2 • Another • Blue footed boobie • Spider

  27. Natural Selection and Specialization

  28. Charles Darwin • Studied Medicine and Theology • Excelled in Geology and Biology • In 1831 Darwin joined the H.M.S. Beagle on a trip around the world to make maps • He was the ship’s naturalist • Darwin’s Diary (optional)

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