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Matthew Subia 1 , Paul Barber 2 1 CSU Monterey Bay, 2 Boston University

Matthew Subia 1 , Paul Barber 2 1 CSU Monterey Bay, 2 Boston University. Phylogeographic structure of Tridacna crocea across the Indo West Pacific “How diverse is your clam chowda?”. IWP is Center of Marine Biodiversity. Fish. Corals. Snails. Roberts et al. 2002. Giant Clam Distribution.

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Matthew Subia 1 , Paul Barber 2 1 CSU Monterey Bay, 2 Boston University

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  1. Matthew Subia1, Paul Barber2 1CSU Monterey Bay, 2Boston University Phylogeographic structure of Tridacna crocea across the Indo West Pacific“How diverse is your clam chowda?”

  2. IWP is Center of Marine Biodiversity Fish Corals Snails Roberts et al. 2002

  3. Giant Clam Distribution

  4. Giant Clam Importance • Food • Colorful decorations • During 1960’s and 70’s annual landings estimated at 100-400 tons. • In 1985, clams were included in the convention on International Trade in Endangered Species of Wild Fauna and flora

  5. Concerns for Giant Clams • Commercial and artisanal exploitation • Bleaching • Disease • Pollution • Poaching

  6. Tridacna crocea

  7. Natural History of T. crocea • Adults tend to burrow in coral in waters less than 10 m deep • Hermaphroditic and reach sexual maturity in approximately 5-7 years • Broadcast spawners • Sperm released first • Eggs follow • Algal symbionts and filter feeders

  8. Asia Pacific Ocean Indian Ocean Australia 400km

  9. Coastal margins during low sea levels stands Indonesia in the Pleistocene After Voris 2002 400km

  10. Genetic differentiation of Pacific and Indian Ocean populations of Starfish Williams et al. 2002

  11. Duke et al. 1999 Lavery et al. 1996 Williams & Benzie, Benzie & Williams 1997 McMillan & Palumbi 1996

  12. H. pulchella ST=0.87 p=0

  13. Sampled C & W Pacific Populations

  14. Plotted Nm values on geography

  15. Objectives • What are the patterns of genetic structuring of T. crocea in Indonesia? • Is there evidence for limited genetic exchange among populations? • Do they show Pacific-Indian Ocean split?

  16. Methods • Extracted DNA from T. crocea tissue samples using Chelex • Amplified DNA using PCR and mtCO1 T. crocea specific primers • Sequenced DNA using ABI 377 • Sequences aligned and edited using Sequencher 4.5 • Sequences analyzed in Arlequin 2.0

  17. N=287

  18. Geographic Distribution

  19. AMOVA Results

  20. Pairwise Comparison

  21. Conclusion • T. crocea demonstrates a new pattern in comparison to previously studied species in this region • Three distinct clades exist: • 1 in the far west • 1 in the far east • 1 in central • Therefore, T. crocea shows regional genetic structure

  22. Acknowledgements • Paul Barber • Elizabeth Jones • Joshua Drew • Eric Crandall • Timery DeBoer • Craig Starger • NSF

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