4 6 species role in ecosystems

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  • 1. 4-6 Species Role in Ecosystems
  • 2. Concept to Understand• Each species plays a specificecological role called its niche.
  • 3. Ecological Niche• Every species occupy unique niches and play specificroles in an ecosystem
  • 4. Ecological Niche• Generalist species – can live many different places,eat many things, tolerate wide variety ofenvironmental conditions▫ Examples: people, mice, cockroaches
  • 5. Cockroach Information• Existed for 350 million years – 3,500 known species• Highly adapted, rapidly producing generalists▫ Consume almost anything▫ Endure food shortage▫ Survive everywhere except polar regions▫ Avoid predation• Carry human diseases
  • 6. Ecological Niche• Specialist species – can only survive in very specifichabitat▫ Examples: most salamanders, giant pandas
  • 7. Ecological Niche• Native species – naturally found in that ecosystem• Nonnative species – invasive, alien, exotic• Spread to new ecosystems (because of humans)• Problems:• 1. No predators• 2. Kill native specieswhich lack adaptation
  • 8. Indicator Species• Indicator Species - Early warningsystem, damage to the environmentcauses this species population decline.
  • 9. Keystone Species• Keystone Species - Significant role inecosystem food web: large affect on otherspecies in an ecosystem.• Ex. Algae
  • 10. Keystone Species• Elimination mayalter structureand/or functionof ecosystem• Pollinators –bees, butterflies,hummingbirds,bats
  • 11. Keystone Species• Top predators – alligator, wolf, lion,sharks
  • 12. Keystone Species• Keystone species create habitat/ecosystem & help to keep itfunctioning.
  • 13. Foundation Species• Create habitats and ecosystems• Ex. Beavers, Elephants, Seed dispersers