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Competitive Interactions on Coral Reefs: Dynamics of Algae, Coral, and Fish

This study explores competitive interactions on coral reefs, focusing on various forms of competition between corals and associated organisms. Key mechanisms include direct competition through mesenterial filaments and sweeper tentacles, and indirect competition via overgrowth and shading. The dynamics of recruitment and mortality of new recruits are examined, highlighting the role of macroalgae, sponges, and cryptic metazoans. Additionally, the territorial behaviors of reef fish and their impact on coral health and space utilization are discussed, providing insight into the complex interplay within reef ecosystems.

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Competitive Interactions on Coral Reefs: Dynamics of Algae, Coral, and Fish

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  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. 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

  13. Competition and New Recruits Vermeij, ‘06

  14. Competition and New Recruits Vermeij, ‘06 3 m

  15. Competition and New Recruits Vermeij, ‘06 Available space Time

  16. Competition and New Recruits Vermeij, ‘06 Overgrowth

  17. Competition and New Recruits % Cover Vermeij, ‘06 Time Unoccupied % Cover Coralline algae Macroalgae Sponges Time

  18. Competition and New Recruits Vermeij, ‘06 50 40 30 20 10 0 % Mortality

  19. Competition and New Recruits Vermeij, ‘06 Greatest contributors to recruit mortality 1. Sponges 2. Bivalves

  20. Competition among Cryptic Metazoa

  21. Competition among Cryptic Metazoa Jackson (‘92) - artificial substrates Free space Colonials % Cover Solitary Time

  22. Competition among Cryptic Metazoa Jackson (‘92) - artificial substrates % suspended cells retained Abundance Sponges Bryozoans Time

  23. Competition among Reef Fish Williams ‘78 3 spot territory Dusky territory Acropora Dusky 3-spot

  24. 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

  25. Competition among Reef Fish Roberston ‘96 Species A B C D E F Populations doubled in size & moved from periphery to centre of reef

  26. Competition among Reef Fish Roberston ‘96 Species A B C D E F - little effect - space allocated randomly

  27. KARST SHORE

  28. KARST SHORE - ZONATION

  29. KARST SHORE - ZONATION EHW White Zone MHW Gray Zone Black Zone Yellow Zone MLW Pink Zone ELW

  30. KARST SHORE - ZONATION WHITE ZONE

  31. KARST SHORE - ZONATION GRAY ZONE

  32. KARST SHORE - ZONATION BLACK ZONE

  33. KARST SHORE - ZONATION YELLOW ZONE

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