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Communities & Ecosystems. Honors Biology Ch 37 concepts. Communities described by:. Species diversity (biodiversity) Richness Relative abundance Dominant species Succession Keystone species Response to disturbances Trophic structure Feeding structure.

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communities ecosystems

Communities & Ecosystems

Honors Biology Ch 37 concepts

communities described by
Communities described by:
  • Species diversity (biodiversity)
    • Richness
    • Relative abundance
  • Dominant species
    • Succession
    • Keystone species
  • Response to disturbances
  • Trophic structure
    • Feeding structure
evolution is key to forming niches
Evolution is key to forming niches
  • Role an organism plays in the Environment
interactions tie populations together as communities
Interactions tie populations together as communities
  • Symbiosis
    • any close relationship between species
  • Influenced by NRG gain/loss
  • Evolution’s role in interactions?
interactions symbiosis
Interactions (symbiosis)
  • Helpful
    • Mutualism
    • Commensalism
    • Predator/prey
    • Coevolution
      • herbivory
  • Harmful
    • Parasite/host
    • Competition
  • Neither
    • neutralism
evolutionary influence on symbiosis
Evolutionary influence on symbiosis
  • camouflage
    • Batesian mimicry
    • Mullerian mimicry
trophic levels
Trophic levels
  • Producers form the basis
  • Consumers “eat” those below them
  • Only 10-20% of the energy of one level is passed on to the next level
  • Up to 90% of the energy available at one level is LOST to the other levels as HEAT
  • HOW many trophic levels can any ecosystem support?
in all ecosystems
In all ecosystems…
  • Energy is moved through an ecosystem via a series of linked reactions
  • Some is lost as heat
  • The role an organism plays determines how much energy it will get
  • (nutrient matter is recycled)
biomagnification
BioMagnification
  • Youtube video – garbage island
slide16
The more interconnections that are made, the more stable an ecosystem is
  • Species diversity or species richness
  • diversity = stability = survivability of ecosystem
slide18
Primary succession
    • Pioneer plant
  • Secondary succession