Life And Death At Chek Jawa 9th August 08

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  • Hi Allan, feel free to link the slides to ur website. Pls share with us your website url once its done. Thks
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  • Hi Kok Sheng,

    Like you informative and somewhat scientific approach on the subject of Chek Jawa . The slides inject life and passion to Chek Jawa as opposed to your pessimistic n melancholic approach towards Chek Jawa. Your slides document well of the living aspect of Chek Jawa and it also presents vividly of its living treasures in today's modern Singapore. I wish to share with you that together with a couple of course mates, we are working on a website on Pulau Ubin which emcompasses Chek Jawa. The objective of this website is to promote the interest and awareness of this last remaining island of Singapore, to both local and international visitors. When come to the day of reckoning, we hope that the authorities will considered the conservation of Pulau Ubin and Chek Jawa in its natural form - leaving a living legacy to our future generation of Singaporean.
    I would seek your consent to link your slide presentation to our website where it will definitely present an uncommercialised view of Chek Jawa. My email contact is allanhuikh@gmail.com. Cheers Allan ( hope to hear from you soon )
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  • Interesting - thanks for sharing your work!
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  • Life And Death At Chek Jawa 9th August 08

    1. 1. LIFE AND DEATH AT CHEK JAWA 9 th August 2008
    2. 2. I volunteer with… <ul><li>Team Seagrass </li></ul><ul><li>Naked Hermit Crabs </li></ul><ul><li>Semakau intertidal walks with Raffles Museum of Biological Research (RMBR) </li></ul>
    3. 3. Key points of this session <ul><li>High Biodiversity of Chek Jawa </li></ul><ul><li>Mass death on January 2007 </li></ul><ul><li>How this study began? </li></ul><ul><li>What caused the mass death? </li></ul><ul><li>How are the marine animals recovering? </li></ul><ul><li>What is the future of Chek Jawa? </li></ul><ul><li>Experiences of this project </li></ul>
    4. 4. Have you been to Chek Jawa before?
    5. 5. Where is Chek Jawa
    6. 6. Chek Jawa
    7. 7. Chek Jawa is lauded for its high biodiversity Figure from Ria Tan Six distinct ecosystems exist at Chek Jawa and it is abundant with locally rare fauna and flora
    8. 8. Coastal Hill Forest
    9. 9. Mangroves
    10. 10. Rocky Shore Photos: N. Sivasothi
    11. 11. Sandy Ecosystems Photos: Ria Tan
    12. 12. Seagrass Lagoon
    13. 13. Coral Rubble Area Photos: Ria Tan
    14. 14. URA development guide plan 1997 To be reclaimed
    15. 15. Chek Jawa reclamation deferred!
    16. 16. Key points of this session <ul><li>High Biodiversity of Chek Jawa </li></ul><ul><li>Mass death on January 2007 </li></ul><ul><li>How this study began? </li></ul><ul><li>What caused the mass death? </li></ul><ul><li>How are the marine animals recovering? </li></ul><ul><li>What is the future of Chek Jawa? </li></ul><ul><li>Experiences of this project </li></ul>
    17. 17. Mass mortality occurred on January 2007
    18. 18. After a period of exceptional heavy rain in Jan 2007, a field trip to Chek Jawa revealed…
    19. 20. Living Carpet Anemones
    20. 21. Dying Carpet Anemones
    21. 22. Living Sponges
    22. 23. Dying Sponges
    23. 24. Living sea stars and sea cucumbers
    24. 25. Dying sea stars and sea cucumbers
    25. 26. Soft bodied marine animals affected
    26. 27. Key points of this session <ul><li>High Biodiversity of Chek Jawa </li></ul><ul><li>Mass death on January 2007 </li></ul><ul><li>How this study began? </li></ul><ul><li>What caused the mass death? </li></ul><ul><li>How are the marine animals recovering? </li></ul><ul><li>What is the future of Chek Jawa? </li></ul><ul><li>Experiences of this project </li></ul>
    27. 28. Asking questions <ul><li>What happened at Chek Jawa? </li></ul><ul><li>What caused the mass death? </li></ul><ul><li>Why were some animals more affected as compared to others? </li></ul><ul><li>Is this mass death a tragic event? </li></ul><ul><li>Will Chek Jawa recover? </li></ul><ul><li>If yes, how? </li></ul>
    28. 29. Answering questions through.. <ul><li>UROPS </li></ul>
    29. 30. What is UROPs
    30. 31. Undergraduate Research Opportunities Programme in Science <ul><li>doing an independent research project </li></ul><ul><li>work with Faculty staff </li></ul><ul><li>work in a specific field of study </li></ul>
    31. 32. What motivated me to do this Chek Jawa study ? <ul><li>Curiosity </li></ul><ul><li>Answer questions </li></ul><ul><li>gain experience </li></ul><ul><li>Relevance to conservation </li></ul>
    32. 33. My supervisors <ul><li>1. Mr. N. Sivasothi </li></ul><ul><li>(Department of Biological Science, NUS) </li></ul><ul><li>2. Dr. Peter Todd </li></ul><ul><li>(Department of Biological Science, NUS) </li></ul><ul><li>3. Dr. Dan Rittschof </li></ul><ul><li>(Duke University) </li></ul>Photo: Ria Tan
    33. 34. At the beginning… <ul><li>reading up various literatures </li></ul><ul><li>compilation of data and past observations </li></ul><ul><li>Discussions with my supervisors and experts </li></ul><ul><li>Conducting of field surveys </li></ul>
    34. 35. Key points of this session <ul><li>High Biodiversity of Chek Jawa </li></ul><ul><li>Mass death on January 2007 </li></ul><ul><li>How this study began? </li></ul><ul><li>What caused the mass death? </li></ul><ul><li>How are the marine animals recovering? </li></ul><ul><li>What is the future of Chek Jawa? </li></ul><ul><li>Experiences of this project </li></ul>
    35. 36. Figure: Aerial photograph of Chek Jawa (squared in white) and its surrounding. Photo by Google Earth. Kuala Johore Salinity decreases
    36. 37. Heavy rainfall and flooding events <ul><li>Intensified northeast monsoon in December and January </li></ul><ul><li>Flooding reported in different parts of Malaysia and Singapore </li></ul><ul><li>Freshwater surge into Chek Jawa from Johor River </li></ul>
    37. 38. Chek Jawa Enhanced runoff? Narrowed Johor Straits channel amplifies discharge
    38. 39. How wide is the mouth of Johor River
    39. 40. What may have contributed to the mass death? <ul><li>incidents of low tide </li></ul><ul><li>amplified river output </li></ul><ul><li>prolonged direct rainfall </li></ul>
    40. 41. Side view Bird’s eye view
    41. 42. Cumulative rainfall data for January 2007 taken from Changi Meteorological Station Prolonged Prolonged direct rainfall for about three days Mass death first sighted
    42. 43. Incidence of low tide: 11-14 January 2007 1.5 1.6 16:00 1.3 4.4 15:00 1.1 2.3 14:00 1.1 2.3 13:00 1.2 2.4 12:00 14th 1.3 1.1 13:00 1.3 4.6 12:00 13th 1.5 4.7 22:00 1.6 1.9 21:00 1.8 13 14:00 1.6 24.1 13:00 1.4 10.7 12:00 1.3 7.4 11:00 12th 1.6 1.4 0:00 1.4 10.9 23:00 1.3 3.3 22:00 1.3 2.1 21:00 1.4 14.1 11:00 1.3 7.8 10:00 11th Tide level (m) Hourly Rainfall (mm) Hour Jan-07
    43. 44. Amplified river output?
    44. 45. Rainfall data to predict river water level patterns for January 2007 December 2006 January 2007
    45. 46. River water-level data for December 2006, taken from Johor River, Kota Tinggi.
    46. 47. Key points of this session <ul><li>High Biodiversity of Chek Jawa </li></ul><ul><li>Mass death on January 2007 </li></ul><ul><li>How this study began? </li></ul><ul><li>What caused the mass death? </li></ul><ul><li>How are the marine animals recovering? </li></ul><ul><li>What is the future of Chek Jawa? </li></ul><ul><li>Experiences of this project </li></ul>
    47. 48. Conducting of field surveys <ul><li>Transects surveys (once in 3 months) </li></ul><ul><li>Monitoring of different groups of marine animals (once in 2 months) </li></ul>
    48. 49. Sometimes we set off early…
    49. 50. … sometimes we go back late
    50. 51. T6 T5 T4 T3 T2 T1 N
    51. 52. Six transect lines T1 T2 T3 T4 T5 T6 T1 T5 T4 T3 T2 T6
    52. 53. Transect surveying
    53. 54. Sometimes disasters do happen…
    54. 55. … after a day’s hard work
    55. 56. Number of tubeworms between four periods suggests recovery
    56. 57. Monitoring Recovery <ul><li>Specific fauna targeted </li></ul><ul><li>Once every two months </li></ul><ul><li>Record density </li></ul><ul><li>Study changes </li></ul>
    57. 59. Monitoring Mussel Beds
    58. 60. A closer look
    59. 61. Asian date mussel An invasive species
    60. 62. A friend or a foe? > can dominate and exclude some species by aggregation in high density > may restrict growth of seagrass > provide additional habitat
    61. 63. Dec 2007 vs Jan 2008 suggests a possibility of mussel beds slowly being replaced away as recovery progresses
    62. 64. Latest update from last Monday
    63. 65. Missing in action
    64. 66. Slowly but surely being eaten up? Real reason behind such an elimination is difficult to account for More will be needed to give a scientific explanation
    65. 67. Carpet Anemones Photos: Ria Tan <ul><li>30 located and marked </li></ul><ul><li>Shortest and longest diameter axis measured </li></ul><ul><li>Tentacles counted </li></ul>
    66. 68. Not all things work!
    67. 69. Sea anemone morphology is variable NOT easy to study
    68. 70. What I’ve learnt from field applications from Dr Daphne Fautin? <ul><li>anemones from tide pools contract when exposed to air </li></ul><ul><li>can detach and move </li></ul><ul><li>difficult to determine size </li></ul><ul><li>density differs </li></ul><ul><li>incorrect to correlated size with age </li></ul>
    69. 71. Sand dollars
    70. 72. Sand stars  
    71. 73. Common sea stars
    72. 74. Button shells
    73. 75. Peacock Anemones
    74. 76. The sandbar before mass mortality is covered with several carpet anemones. After the mass mortality, the sand bar is almost barren of carpet anemones. These post mortality photographs were taken as part of using photographs for comparison and also to monitor recruitment over time. 12 January 2002 25 December 2007 16 August 2007 22 January 2008
    75. 77. Latest update from last Monday
    76. 78. 4 August 2008 Still no anemones back on sand bar? <ul><li>long time to rebuild a population? </li></ul><ul><li>Among the largest anemones </li></ul><ul><li>live several centuries </li></ul><ul><li>Replace themselves during their lifetime </li></ul><ul><li>Reproduction is slow </li></ul>
    77. 79. Key points of this session <ul><li>High Biodiversity of Chek Jawa </li></ul><ul><li>Mass death on January 2007 </li></ul><ul><li>How this study began? </li></ul><ul><li>What caused the mass death? </li></ul><ul><li>How are the marine animals recovering? </li></ul><ul><li>What is the future of Chek Jawa? </li></ul><ul><li>Experiences of this project </li></ul>
    78. 80. Life at Chek Jawa
    79. 87. What is the future for Chek Jawa ? <ul><li>Appears to be recovering </li></ul><ul><li>Recruitment of larvae from nearby seeding sites </li></ul><ul><li>Designation as protected area enhances natural recovery </li></ul><ul><li>Marine life is vulnerable </li></ul><ul><li>better understanding is essential to protect Chek Jawa </li></ul>
    80. 88. Key points of this session <ul><li>High Biodiversity of Chek Jawa </li></ul><ul><li>Mass death on January 2007 </li></ul><ul><li>How this study began? </li></ul><ul><li>What caused the mass death? </li></ul><ul><li>How are the marine animals recovering? </li></ul><ul><li>What is the future of Chek Jawa? </li></ul><ul><li>Experiences of this project </li></ul>
    81. 89. Some interesting experiences
    82. 90. Celebrating Christmas at Chek Jawa
    83. 95. On a more serious note…
    84. 96. Nearing submission of report…
    85. 97. Intense email discussions with various supervisors/experts etc
    86. 98. Corrections on my report drafts
    87. 99. How this project has enhanced my undergraduate experience ? <ul><li>Understand the meaning of research </li></ul><ul><li>Start questioning, analysing and exploring </li></ul><ul><li>More questions than answers </li></ul><ul><li>Walk out of comfort zone </li></ul><ul><li>Some of best learning is </li></ul><ul><li>by making mistakes </li></ul>
    88. 100. Friend who is inspired to do work at Chek Jawa too
    89. 101. What are my future plans ? <ul><li>Preparing to publish my findings </li></ul><ul><li>Working on sea stars behaviour and ecology </li></ul><ul><li>teaching after I graduate from NUS </li></ul><ul><li>Sharing experiences with my students </li></ul>
    90. 102. Find out more about the project here <ul><li>cjproject.blogspot.com </li></ul>
    91. 103. Thank you !

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