Coral Reef Succession. Ecological Succession. The progressive change in the species composition of an ecosystem. New Bare Substrate. Colonizing Stage. Successionist Stage. Climax Stage. Ecological Succession. 2 types of succession. SECONDARY. PRIMARY.
The progressive change in the species composition of an ecosystem.
For example, new land created by a volcanic eruption is colonized by various living organisms
Disturbances responsible can include cleared and plowed land, burned woodlands
Sep. 24, 1980
May 18, 1980
Fireweed 1980 after eruption
What organisms would appear first?
How do organisms arrive, i.e., methods for dispersal?
Volcanic eruption creates
Hanauma Bay Tuff Ring
Ex. Early marine colonists provide a substrate conducive for settling of later arriving species.
First arrivals take precedence.
Competition for space, nutrients and light; allopathic chemicals.
As resources become scarce due to depletion and competition, species capable of tolerating the lowest resource levels will survive.
Mechanisms of Succession
high growth rate
short life span
low competitive ability
low reproductive output
higher maternal investment per offspring
high competitive ability
long life span
slow growth rate
r & K Selected Species
Pioneer species- 1st species to colonize a newly disturbed area
r & K refer to parameters in logistic growth equation
Late successional species
(Competitive Exclusion Model)
(Intermediate Disturbance Model)
Near reef crest
Reef slope beneath
Deep reef slope
b) Wetlands in Texas, following Hurricane Rita
c) A receding glacier
d) A dried up lake
e) Primary succession would not occur on any of these.
Primary succession would take place on all of the following EXCEPT:
A “K” selected species generally has all of the following characteristics EXCEPT:
a) Large size
c) Good competitor
d) Constant population size
e) Slow population growth