Community ecology Flashcards

1
Q

An ecological community is composed of:

A

All populations of all species living close enough for actual or potential interaction, directly or indirectly

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2
Q

What are the building blocks of community ecology?

A

Species Interactions

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3
Q

Negative interactions for species x and y =

A

Competition

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4
Q

Interactions positive for species x and negative for species y =

A

Predation

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5
Q

Classifications of interactions based on outcomes for individual species and joint outcomes for all species involved:

A

Help / Hinder / No effect

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6
Q

Interspecific competition

A
  • multiple species exploiting same limited resource
  • negative impact on all species involved
  • competition exclusion
  • limiting resources means no 2 species can co-exist in the same space
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7
Q

what is an ecological niche?

A

The sum of a species’ use of the biotic and abiotic resources in it’s environment

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8
Q

Consequences of competition

A
  • drives species to occupy different niches
  • species can co-exist if niches are sufficiently different, if they change or only slightly overlap
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9
Q

How might a species niche change?

A
  • natural selection for a species to access different resources
  • this differentiation = Resource partitioning
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10
Q

Competition and resource partitioning can lead to what?

A

Character displacement

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11
Q

When does character displacement occur?

A

When related species are more similar in isolation then when they occur together
- Allopatry and sympatry

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