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Competitive Interactions on a Reef

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Benthic Cryptofauna. Fish and Territory. Topics. Death. recruitment. Clonal Life History ... Contact and interaction between soft tissues of coral. No contact ... – PowerPoint PPT presentation

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Title: Competitive Interactions on a Reef


1
Competitive Interactions on a Reef
2
Topics
Coral Coral Coral Algae Competition and
Recruitment Benthic Cryptofauna Fish and
Territory
3
Clonal Life History
recruitment
Fission
Fission
Fission
Death
4
Kinds of Competition between Corals
Connell (73)
Contact and interaction between soft tissues of
coral
No contact between coral colonies
Direct Competition
Indirect Competition
5
Kinds of Competition between Corals
Direct Competition
1. Mesenterial Filaments
6
Kinds of Competition between Corals
Direct Competition
2. Sweeper Tentacles
7
Kinds of Competition between Corals
Direct Competition
3. Sweeper Polyps (Goniopora)
8
Kinds of Competition between Corals
Direct Competition
4. Mucous Secretion (Fungia)
9
Kinds of Competition between Corals
Direct Competition
5. Histoincompatibily
10
Kinds of Competition between Corals
Direct Competition
6. Overgrowth
11
Kinds of Competition between Corals
Indirect Competition
1. Overtopping
12
(No Transcript)
13
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
14
Competition and New Recruits
Vermeij, 06
15
Competition and New Recruits
Vermeij, 06
3 m
16
Competition and New Recruits
Vermeij, 06
Available space
Time
17
Competition and New Recruits
Vermeij, 06
Overgrowth
18
Competition and New Recruits
Cover
Vermeij, 06
Time
Unoccupied
Cover
Coralline algae
Macroalgae
Sponges
Time
19
Competition and New Recruits
Vermeij, 06
50 40 30 20 10 0
Mortality
20
Competition and New Recruits
Vermeij, 06
Greatest contributors to recruit mortality
1. Sponges
2. Bivalves
21
Competition among Cryptic Metazoa
22
Competition among Cryptic Metazoa
Jackson (92) - artificial substrates
Free space
Colonials
Cover
Solitary
Time
23
Competition among Cryptic Metazoa
Jackson (92) - artificial substrates
suspended cells retained
Abundance
Sponges
Bryozoans
Time
24
Competition among Reef Fish
Williams 78
3 spot territory
Dusky territory
Acropora
Dusky
3-spot
25
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
26
Competition among Reef Fish
Roberston 96
Species A B C D E F
Populations doubled in size moved from
periphery to centre of reef
27
Competition among Reef Fish
Roberston 96
Species A B C D E F
- little effect - space allocated randomly
28
KARST SHORE
29
KARST SHORE - ZONATION
30
KARST SHORE - ZONATION
EHW
White Zone
MHW
Gray Zone
Black Zone
Yellow Zone
MLW
Pink Zone
ELW
31
KARST SHORE - ZONATION
WHITE ZONE
32
KARST SHORE - ZONATION
GRAY ZONE
33
KARST SHORE - ZONATION
BLACK ZONE
34
KARST SHORE - ZONATION
YELLOW ZONE
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