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Chapter 5,9 &10: Review…How do we get Bio Diversity PowerPoint PPT Presentation


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Chapter 5,9 &10: Review…How do we get Bio Diversity. Biodiversity Influenced by Climate which determines biomes, Diverse Habitat and Natural selection ….species interactions…. Natural Selection . Some individuals may be better suited to the environment than others.

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Chapter 5,9 &10: Review…How do we get Bio Diversity

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Chapter 5 9 10 review how do we get bio diversity l.jpg

Chapter 5,9 &10: Review…How do we get Bio Diversity

Biodiversity Influenced by

Climate which determines biomes, Diverse Habitat and Natural selection

….species interactions….


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Natural Selection

  • Some individuals may be better suited to the environment than others.

  • Those better able to survive and reproduce leave more offspring. Bird of Paradise

  • Their descendants form a larger proportion of the next generation.


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Mutation

  • Genes are inherited from one generation to the next

    • Genes made up of DNA

  • When cells divide

    • DNA is reproduced , Each cell gets a copy

  • If an error occurs in the reproduction of DNA it gets passed to new cells

  • DNA change = Mutation


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Mutation


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The Evolution of Life on Earth

  • Earliest fossils 3.5 billion years old

    • Photosynthetic relative of bacteria

    • Released large amounts of oxygen into the atmosphere


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Evolution of Life on Earth

Carl Sagan


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The Evolution of Life on Earth

  • Cambrian Period 600 million years- 500 my

    • Earliest multicellular organisms

    • Shells, gills, filters, efficient guts and circulatory system.

    • Life remained in oceans


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The Evolution of Life on Earth

  • Devonian Period

    • 420–360 million years ago

    • First animals on land = crossopterygian

    • Gave rise to the amphibians

      • Still tied to water for reproduction

      • Modern species include frogs, toads, newts, limbless water “snakes”


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Early Life on Land Innovations for life on landStructural supportAvoid dessication and UV raysMeans for exchanging gases with airA moist environment for reproduction system


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The Evolution of Life on Earth

  • Reptiles

    • Freed from water by evolving a watertight egg

    • Originate in the Carboniferous (375 mya)

    • Wide spread by the Jurassic (185 mya)

    • Two orders of dinosaurs that gave rise to mammal and birds.


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The Evolution of Life on Earth

  • Mammals

    • More capable brain and faster metabolism

    • Placental uterus one key to mammalian success


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Human Success

Walking upright

Strong Opposable thumb

Complex brain

That means we can solve problems and work to live more sustainably


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Varied Habitat calls for varied forms


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Virginia

California


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Habitats are dynamic… constantly changing.. Succession


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Primary Succession

Where there was no life previously

Examples

-after a lava flow and at the edge of a receding glacier.


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Secondary Succession- re-colonization

Secondary succession- from abandoned field to mature forest


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Dune Succession

Plants of early succession tend to be

Small, grow well in bright light, and withstand harshness of environment

Over time, soils richer, hold more moisture and larger plants can become established

Eastern red cedar, eastern white pine

Beech and maple later on


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Succession and Chemical Cycling


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