31. Succession Flashcards
Insurance hypothesis:
What affect does diversity have on stability?
Increased diversity increases community stability
Increased probability some genotype will be present and able to cope with disturbance
What was the Park Grass Experiment at Rothamsted?
A study intended to test the effect of fertilizer on hay yield, but helps describe community composition over time
Succession involves a change in (6 things)
Diversity
Dominance
Evenness
Composition
Soil properties
Nutrient flow
Why would a species establish? (5 things)
Dispersal
Niche requirements
Competition
Exploitation
Mutualists
How long does Glacier Bay succession take?
Centuries to millennia
Chronosequence
A series of communities or ecosystems representing a range of ages or times since disturbance
What kind of succession takes place in a glacier bay
Primary succession
How long does boreal forest succession take
~200 years
What kind of succession takes place in boreal forests
Secondary succession
How long does succession take in intertidal communities
~1.5 years
How long does succession take in a desert stream?
A few weeks
Sedimentation
Deposition of suspended matter onto lake bottom
How does succession of a shallow lake proceed
Sedimentation leads to the lake becoming a marsh
Eventually becomes
Bog/fen (organic sediment)
Or
Terrestrial vegitation (erosion derived sediment)
What properties if an ecosystem can change during succession (4 things)
Biomass
Primary production
Respiration
Nutrient retention
What are the 3 modes of succession
Facilitation
Tolerance
Inhibition
