competitive interactions on a reef
DESCRIPTION
Competitive Interactions on a Reef. Topics. Coral Coral Coral Algae Competition and Recruitment Benthic Cryptofauna Fish and Territory. Clonal Life History. recruitment. Fission. Fission. Fission. Death. Kinds of Competition between Corals. Connell (‘73). - PowerPoint PPT PresentationTRANSCRIPT
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Competitive Interactions on a Reef
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Coral Coral
Coral Algae
Competition and Recruitment
Benthic Cryptofauna
Fish and Territory
Topics
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Death
recruitment
Clonal Life History
FissionFissionFission
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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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Mechanisms for Algal Effects on Corals
Microalgae
Filamentous
Foliose
Crustose
Calcareous
Branching Digitate Tabulate Encrusting Massive Mushroom
O, C O, C O, C O, C O, C -
O, C O, C O, C O, C O, C -
O, O, O, O, O, -
O, - - O, O, -
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
Availablespace
Time
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Competition and New Recruits
Vermeij, ‘06
Overgrowth
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Competition and New Recruits
Vermeij, ‘06
Unoccupied
Coralline algaeMacroalgaeSponges
%Cover
%Cover
Time
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
% Cover
Time
Free space
Colonials
Solitary
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Competition among Cryptic Metazoa
Jackson (‘92) - artificial substrates
Abundance
Time
% suspended cellsretained
Sponges
Bryozoans
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Competition among Reef Fish
3 spot territory
Dusky territory
Acropora
3-spot
Dusky
Williams ‘78
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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
FPopulations 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
White ZoneGray Zone
Black ZoneYellow Zone
Pink ZoneELW
EHW
MLW
MHW
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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