Phylogeographic structure of Tridacna crocea across the Indo West Pacific “How diverse is your clam chowda?” Matthew Subia 1, Paul Barber 2 1 CSU Monterey.

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Presentation transcript:

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

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

Giant Clam Distribution

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

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

Tridacna crocea

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

Pacific Ocean Indian Ocean Australia Asia 400km

Coastal margins during low sea levels stands Indonesia in the Pleistocene After Voris km

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

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

 ST =0.87 p=0 H. pulchella

Sampled C & W Pacific Populations

Plotted Nm values on geography

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?

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

N=287

Geographic Distribution

AMOVA Results

Pairwise Comparison

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

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