Aspects in the Biology of Sea Turtles

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1 Charting Multidisciplinary Research and Action Priorities towards the Conservation and Sustainable Management of Sea Turtles in the Pacific Ocean: A Focus on Malaysia Malaysia s Natural Heritage Aspects in the Biology of Sea Turtles Leatherback turtle Dermochelys coriacea Green turtle Chelonia mydas H.C. Liew SEATRU, KUSTEM 213 Kuala Terengganu, Malaysia < kustem.edu.my/.my/seatru Hawksbill turtle Eretmochelys imbricata Olive-ridley turtle Lepidochelys olivacea Leatherback Turtle Largest of the sea turtles, adults weigh 3 6 kg Feeds largely on jellyfish and other gelatinous invertebrates Olive Ridley Turtle Smallest of the sea turtles nesting in Malaysia (3 6 kg) Feeds largely on shellfish, crustaceans, and other invertebrates Once renowned population in Rantau Abang, Terengganu, dropped from 1, nests / yr in 195 s to less than 1 in recent years. Loss as tragic as for the leatherback turtle. along the mainland coast of Terengganu is virtually gone. Hawksbill turtle Commonly seen in coral reef areas, feed largely on sponges Shell exploited for the Beko trade, adults weigh 4 9 kg Largely decimated to only a few individual nesters per year Green Turtle Largest Malaysian hard shelled turtles, adults weigh 1 18kg Adults feed largely on seagrass, algae, seaweed Populations have also declined significantly though rate of decline have not reached a critical state.

2 Management practices and policies Terengganu has a long history of sea turtle conservation management programs, dating back to the 195 s for the leatherbacks WHAT WENT WRONG? What do we know about our turtles? Where have all our turtles gone? Have they gone somewhere else to nest? Were they all killed by fishing nets? Did we take too many eggs? What happened to all the millions of hatchlings we released over the years? How many turtles do we have? How often do they reproduce? How fast do they grow? Have we managed our turtles based on good science or politics? Sea Turtle Life-cycle Where do our turtles go after nesting? Can we prevent them from being killed accidentally in fishing nets? Internesting movements of green turtles determined using radio and ultrasonic telemetry Internesting habitat of Terengganu Leatherbacks Tagging Studies To tag and monitor every nesting turtle Kuala Terengganu Rantau Abang TERENGGANU 3km Radio-tracking the movements of leatherbacks after nesting

3 Frequency Nesting frequency distribution of green turtles in Redang (1993 to 21) No. of nestings Female turtles nests several times during her reproductive season Frequency Internesting Intervals of Green Turtles ( ) 92% 6% Days 1% Why nest so many times and at intervals of about 1 days? Follicles Shelled eggs Tag recovery data of green turtles at Chagar Hutang, Redang ( ) Total Total Turtles cannot affort to nest every year Percent of nesters Inter-seasonal nesting frequency 35% 3% 25% 2% 15% 1% 5% % Where do our turtles go after They have finished nesting? Nesting Interval (s) Turtles have to be healthy and built up enough fat reserves to reproduce. This takes a few years. Turtle carrying satellite transmitter released from its nesting beach at Chagar Hutang, Redang

4 8N 6N 4N 2N 2S Pulau Redang WEST MALAYSIA SUMATRA SOUTH CHINA SEA Anambas Tambelan Bangka Island Natuna BRUNEI Turtle A 3 days Turtle B 28 days Turtle C 28 days Turtle D 16 days Turtle E 13 days 2 km PHILIPPINES Bugsuk Island SABAH SARAWAK KALIMANTAN 166 km 1744 km 1153 km 714 km 669 km Migratory pathway and feeding grounds of a hawksbill turtle nesting at Redang,, Terengganu Redang 14E 16E 18E 11E 12E Post-nesting migration of green turtles from Redang, Malaysia Migratory pathways and feeding grounds of green turtles nesting at the Sarawak Turtle Hatchery management practices P. Banggi In-situ hatchery Relocated fenced hatchery Tawi Tawi Sipadan Turtle P. Pandjang

5 HATCHLINGS RACE TO THE SEA Tracking Turtle Hatchlings 1 st hatchling tracked: covered distance of 39 km in 34 hours. 2 nd hatchling: covered distance of 82 km in 39 hours. Disorientation with light Swimming frenzy Hatchlings do not remain in coastal waters but head straight into the open sea away from coastal predators Current patterns in the South China Sea Ocean currents of the Pacific during the northern winter July January Long maturation periods How many turtles are there in a population? Nesting beach Two One Nesting Season Nesting beach Foraging ground Foraging ground Cannot see the impact of overharvesting eggs until it is too late! Nesting beach

6 Different breeding units sharing regional food resources

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