Competitive Interactions on a Reef

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Competitive Interactions on a Reef
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Topics
Coral Coral Coral Algae Competition and
Recruitment Benthic Cryptofauna Fish and
Territory
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Clonal Life History
recruitment
Fission
Fission
Fission
Death
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Kinds of Competition between Corals
Connell (73)
Contact and interaction between soft tissues of
coral
No contact between coral colonies
Direct Competition
Indirect Competition
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Kinds of Competition between Corals
Direct Competition
1. Mesenterial Filaments
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Kinds of Competition between Corals
Direct Competition
2. Sweeper Tentacles
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Kinds of Competition between Corals
Direct Competition
3. Sweeper Polyps (Goniopora)
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Kinds of Competition between Corals
Direct Competition
4. Mucous Secretion (Fungia)
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Kinds of Competition between Corals
Direct Competition
5. Histoincompatibily
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Kinds of Competition between Corals
Direct Competition
6. Overgrowth
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Kinds of Competition between Corals
Indirect Competition
1. Overtopping
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(No Transcript)
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Mechanisms for Algal Effects on Corals
Branching Digitate Tabulate Encrusting
Massive Mushroom
Microalgae
O, C O, C O, C O,
C O, C -
Filamentous
O, C O, C O, C O,
C O, C -
Foliose
O, O, O,
O, O, -
Crustose
O, - -
O, O, -
Calcareous
O, - -
- - -
Macrophytes
S, C S, C S, C S, A
S, A -
O OVERGROWTH, C CHEMICAL, S SHADING, A
ABRASION
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Competition and New Recruits
Vermeij, 06
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Competition and New Recruits
Vermeij, 06
3 m
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Competition and New Recruits
Vermeij, 06
Available space
Time
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Competition and New Recruits
Vermeij, 06
Overgrowth
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Competition and New Recruits
Cover
Vermeij, 06
Time
Unoccupied
Cover
Coralline algae
Macroalgae
Sponges
Time
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Competition and New Recruits
Vermeij, 06
50 40 30 20 10 0
Mortality
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Competition and New Recruits
Vermeij, 06
Greatest contributors to recruit mortality
1. Sponges
2. Bivalves
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Competition among Cryptic Metazoa
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Competition among Cryptic Metazoa
Jackson (92) - artificial substrates
Free space
Colonials
Cover
Solitary
Time
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Competition among Cryptic Metazoa
Jackson (92) - artificial substrates
suspended cells retained
Abundance
Sponges
Bryozoans
Time
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Competition among Reef Fish
Williams 78
3 spot territory
Dusky territory
Acropora
Dusky
3-spot
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Competition among Reef Fish
Robertson 96
Species A B C D E F
Aggressive territory holders - defend and eat
algae
Less aggressive territory holders - wide variety
of foods
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Competition among Reef Fish
Roberston 96
Species A B C D E F
Populations doubled in size moved from
periphery to centre of reef
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Competition among Reef Fish
Roberston 96
Species A B C D E F
- little effect - space allocated randomly
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KARST SHORE
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KARST SHORE - ZONATION
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KARST SHORE - ZONATION
EHW
White Zone
MHW
Gray Zone
Black Zone
Yellow Zone
MLW
Pink Zone
ELW
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KARST SHORE - ZONATION
WHITE ZONE
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KARST SHORE - ZONATION
GRAY ZONE
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KARST SHORE - ZONATION
BLACK ZONE
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KARST SHORE - ZONATION
YELLOW ZONE