Coral Reef and Water Quality Status and Community Understanding of Threats in the Eastern Gulf of Thailand
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TECHNICAL REPORT Project Reference Number: ARCP2012-14NMY-Carter Coral reef and water quality status and community understanding of threats in the Eastern Gulf of Thailand Prepared by: RW (Bill) Carter and Katherine Kelly, University of the Sunshine Coast, Australia with Harriot Beazley and Neil Tindale, University of the Sunshine Coast, Australia S (Yo) Worachananant and P (Ja) Worachananant, Kasetsart University, Thailand Sokhom Thok, Ministry of Tourism, Cambodia i Carter, R.W., K. Kelly, H. Beazley, N. Tindale, S. Worachananant, P. Worachananant, S. Thok Coral reef and water quality status and community understanding of threats in the Eastern Gulf of Thailand ii Carter, R.W., K. Kelly, H. Beazley, N. Tindale, S. Worachananant, P. Worachananant, S. Thok Coral reef and water quality status and community understanding of threats in the Eastern Gulf of Thailand CONTENTS PART ONE: INTRODUCTION ..................................................................................................... 1 1.1 Background ......................................................................................................... 1 1.1.1 Biophysical state of the marine environment ..................................................... 1 1.1.2 Social and cultural influences .............................................................................. 3 1.1.3 Coral reefs, sustainable tourism and economic benefit ...................................... 3 1.2 Research need .................................................................................................... 4 1.3 Research objectives ............................................................................................ 6 PART TWO: CORAL REEF AND SOCIO-ECONOMIC STATUS .............................................................. 2 2.1 Background to coral reefs .................................................................................. 2 2.2 Ecosystem services of coral reefs ....................................................................... 3 2.3 The study area: the east Gulf of Thailand .......................................................... 4 2.3.1 Current research on marine resources ................................................................ 5 2.3.2 Climate and oceanography .................................................................................. 6 2.3.3 Freshwater flows ................................................................................................. 7 2.3.4 Coral reef benthic habitat .................................................................................... 8 2.3.5 Coral reef fish ..................................................................................................... 11 2.3.6 Coral spawning and larval dispersal ................................................................... 12 2.3.7 Seagrass ............................................................................................................. 13 2.3.8 Mangroves ......................................................................................................... 13 2.3.9 Fishing activities ................................................................................................. 13 2.4 Current management measures ...................................................................... 16 2.7.1 Co-management ................................................................................................ 16 2.8 Threats .............................................................................................................. 18 2.8.1 Over-fishing ........................................................................................................ 19 2.8.2 Climate change .................................................................................................. 20 2.8.3 Water quality ..................................................................................................... 20 2.9 Social and economic setting ............................................................................. 21 2.9.1 Demographics .................................................................................................... 21 2.9.2 Fishery dependency in the east Gulf of Thailand............................................... 23 PART THREE: METHODS ........................................................................................................ 25 3.1 Research paradigms for interpreting coral reef status .................................... 25 3.1.1 Four inter-related concepts explaining reef status ............................................ 25 3.1.2 Integrating concepts to explain and predict status ......................................... 28 3.1.3 Applying concepts to this study ......................................................................... 29 3.2 Research methods ............................................................................................ 30 3.2.1 Site selection ...................................................................................................... 30 3.2.2 Data collection ................................................................................................... 31 3.2.3 Data analysis .................................................................................................. 33 PART FOUR: SUMMARY RESULTS AND DISCUSSION ................................................................... 35 4.1 Coral reefs in the east Gulf of Thailand ............................................................ 35 4.1.1 Inshore reefs ...................................................................................................... 35 4.1.2 Offshore reefs .................................................................................................... 36 4.1.3 Key findings ........................................................................................................ 36 4.1.4 Potential responses ........................................................................................... 37 4.2 Coral reef fish in the east Gulf of Thailand ....................................................... 37 4.2.1 Variation between predators and grazer fish guilds .......................................... 37 4.2.2 Variation in species ............................................................................................ 38 4.2.3 Key findings ........................................................................................................ 39 4.2.4 Potential responses ........................................................................................... 40 4.3 Community perceptions of fishery status ........................................................ 40 4.3.1 Thailand communities........................................................................................ 40 4.3.2 Cambodian community ...................................................................................... 42 4.3.3 Key findings ........................................................................................................ 44 iii Carter, R.W., K. Kelly, H. Beazley, N. Tindale, S. Worachananant, P. Worachananant, S. Thok Coral reef and water quality status and community understanding of threats in the Eastern Gulf of Thailand 4.3.4 Potential responses ........................................................................................... 44 PART FIVE: CONCLUSIONS .................................................................................................... 46 5.1 The status of coral reef communities in the east Gulf of Thailand .................. 46 5.2 The status of marine waters in the east Gulf of Thailand ................................ 46 5.3 Community perception of coral reef and fishery status .................................. 46 5.5 Strategic action ................................................................................................. 47 REFERENCES ................................................................................................................ 48 APPENDIX 1 SITE DESCRIPTIONS ............................................................................................ 57 APPENDIX 2 BENTHOS COVER AND WATER QUALITY OF SAMPLED SITES ........................................ 63 iv Part one: Introduction Coral reef and water quality status and community understanding of threats in the Eastern Gulf of Thailand Project Reference Number: ARCP2012-14NMY-Carter Part One: Introduction 1.1 Background Coral reefs are biologically diverse ecosystems that provide goods and services to millions of people around the world (Moberg & Folke 1999). Human induced habitat degradation of coastal ecosystems presents a direct threat to the food and economic security of coastal communities (Macusi et al. 2011; UNEP 2004). The loss of biodiversity and food security is considered the two most significant threats to human well-being in the 21st century (Foale et al. 2013). Overharvesting of marine resources, marine habitat modification and ecological phase-shifts threaten the integrity and resilience of the marine environment (UNEP 2004). For the people of the Gulf of Thailand, for whom marine resources are integral to their livelihood and culture (Carter 2012; Carter et al. 2013b; UNEP 2004), continuing degradation of their resources could be catastrophic. 1.1.1 Biophysical state of the marine environment The east Gulf of Thailand coastal waters comprise extensive coral reefs, beaches, seagrass meadows and mangrove communities that support coastal fisheries,