Lecture 8: Problem of diveristy Flashcards Preview

APS278: Tropical Forest Ecology & Conservation > Lecture 8: Problem of diveristy > Flashcards

Flashcards in Lecture 8: Problem of diveristy Deck (9)
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1
Q

disturbance delays competitive exclusion, in itself does…

A

not prevent exclusion

2
Q

Lots-Volterra model for competition between 2 species:

A

used t understand when competitive exclusion occurs

3
Q

neutral dynamics:

A
  • if all species were identical
  • nothing to decide which species should be the winner
  • species or individual indent is irrelevant
  • add randomness we can’t predict the outcome
4
Q

neutral competition a __ model=

A

NONEQUILIBRIUM

  • does not explain diversity, except that rate of elimination is v slow
  • in the end in a finite environment we would end up with just one species
5
Q

tow scales of organisation

A
  • local community
  • – a set of species in a give location
  • meta-community
  • –a pool of species from which local communities are formed
6
Q

dynamics of the meta-community are much ___ than those of the local community

A

slower

7
Q

example of a meta-community

A

amazon rain forest

8
Q

Hubbels neutral theory: model for local community

A
  • Think of the community as consisting of a series of ‘sites’
  • Each site is large enough to support one tree
  • J trees in the community: this number is constant, i.e. the community is assumed to be saturated with individuals
  • All individuals are ecologically identical: i.e. occupy the same space and have the same rates of death and reproduction
  • Competition occurs when individuals die
  • gap formation and competition for gap occupancy = gap dynamics
  • -allows a lot of species to persist for long time
  • but eventually random extinction will lead to just one species remaining
  • so need new source of new diversity
9
Q

Hubbels neutral Theory: meta-community

A
  • Individuals migrate from the meta community to the local community
  • Provides an input of new species
  • This compensates for the loss of species in the local community through local extinction
  • This is a wider community from which individuals may immigrate to local communities
  • Is of size J individuals
  • Dynamics of the species pool is governed by speciation-extinction dynamics
  • Speciation occurs at a rate V