Life And Death At Chek Jawa 9th August 08
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The document summarizes a study on the mass mortality event that occurred at Chek Jawa, Singapore in January 2007 following heavy rainfall. Field surveys found many marine invertebrates like anemones, sponges, sea stars and sea cucumbers dying. The study aimed to understand the causes and monitor recovery. Prolonged rainfall and low tides were found to have discharged freshwater from the Johor River into Chek Jawa, causing osmotic stress on marine animals. Surveys since have shown signs of recovery with some populations returning. The future of Chek Jawa relies on continued protection and understanding to safeguard its biodiversity.
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1) A mass mortality event occurred at Chek Jawa intertidal flat in January 2007, killing many soft-bodied invertebrates like sea anemones, sponges, sea stars, and sea cucumbers.
2) The student conducted an independent research project through the UROPs program to investigate the causes of this mass death, examining factors like changes in salinity from rainfall and river outputs.
3) Through field surveys over multiple months, the student monitored recovery of affected species and populations at Chek Jawa, finding signs that it was rebounding with recruitment of larvae from nearby areas.
Life And Death At Chek Jawa Editted verson
1. The document summarizes the author's experience with an undergraduate research project studying the mass death event of marine invertebrates at Chek Jawa, a intertidal flat located off Singapore, in January 2007.
2. Over the course of the project, the author conducted field surveys of the affected area, consulted experts, analyzed data, and worked to determine the cause of the mass death.
3. Through the project, the author gained hands-on research experience, enhanced communication and presentation skills, and explored pursuing further research on sea star behavior and ecology.
Presentation 30 Oct 08
- A mass mortality event occurred in January 2007 at Chek Jawa in Singapore, affecting soft-bodied invertebrates like anemones, sponges, and echinoderms. Prolonged heavy rainfall and low tides led to a freshwater surge that lowered salinity to as little as 4ppt, contributing to the mortality.
- Monitoring found that populations of certain species like tube worms were recovering by 2008. However, mussel beds dominated by an invasive species were still affecting the recovery of other species.
- While some fauna were still absent or in low densities, the future of Chek Jawa appears promising if it continues to be protected, as natural recruitment and recovery
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Life And Death At Chek Jawa 9th August 08
- 1. LIFE AND DEATH AT CHEK JAWA 9 th August 2008
- 4. Have you been to Chek Jawa before?
- 5. Where is Chek Jawa
- 6. Chek Jawa
- 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
- 9. Mangroves
- 10. Rocky Shore Photos: N. Sivasothi
- 11. Sandy Ecosystems Photos: Ria Tan
- 12. Seagrass Lagoon
- 13. Coral Rubble Area Photos: Ria Tan
- 14. URA development guide plan 1997 To be reclaimed
- 15. Chek Jawa reclamation deferred!
- 17. Mass mortality occurred on January 2007
- 18. After a period of exceptional heavy rain in Jan 2007, a field trip to Chek Jawa revealed…
- 20. Living Carpet Anemones
- 21. Dying Carpet Anemones
- 22. Living Sponges
- 23. Dying Sponges
- 24. Living sea stars and sea cucumbers
- 25. Dying sea stars and sea cucumbers
- 26. Soft bodied marine animals affected
- 30. What is UROPs
- 36. Figure: Aerial photograph of Chek Jawa (squared in white) and its surrounding. Photo by Google Earth. Kuala Johore Salinity decreases
- 38. Chek Jawa Enhanced runoff? Narrowed Johor Straits channel amplifies discharge
- 39. How wide is the mouth of Johor River
- 41. Side view Bird’s eye view
- 42. Cumulative rainfall data for January 2007 taken from Changi Meteorological Station Prolonged Prolonged direct rainfall for about three days Mass death first sighted
- 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
- 45. Rainfall data to predict river water level patterns for January 2007 December 2006 January 2007
- 46. River water-level data for December 2006, taken from Johor River, Kota Tinggi.
- 49. Sometimes we set off early…
- 50. … sometimes we go back late
- 51. T6 T5 T4 T3 T2 T1 N
- 52. Six transect lines T1 T2 T3 T4 T5 T6 T1 T5 T4 T3 T2 T6
- 54. Sometimes disasters do happen…
- 55. … after a day’s hard work
- 56. Number of tubeworms between four periods suggests recovery
- 60. A closer look
- 61. Asian date mussel An invasive species
- 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
- 63. Dec 2007 vs Jan 2008 suggests a possibility of mussel beds slowly being replaced away as recovery progresses
- 64. Latest update from last Monday
- 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
- 68. Not all things work!
- 69. Sea anemone morphology is variable NOT easy to study
- 71. Sand dollars
- 72. Sand stars
- 73. Common sea stars
- 74. Button shells
- 75. Peacock Anemones
- 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
- 77. Latest update from last Monday
- 80. Life at Chek Jawa
- 90. Celebrating Christmas at Chek Jawa
- 95. On a more serious note…
- 96. Nearing submission of report…
- 97. Intense email discussions with various supervisors/experts etc
- 98. Corrections on my report drafts
- 100. Friend who is inspired to do work at Chek Jawa too
- 103. Thank you !