- Delphine MUTHS & Jérôme BOURJEA - Connectivity of Marine Protected Areas in South-Western Indian Ocean: Using population genetics of reef fish to contribute.

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- Delphine MUTHS & Jérôme BOURJEA - Connectivity of Marine Protected Areas in South-Western Indian Ocean: Using population genetics of reef fish to contribute to the design of MPAs network

A MPA is an area delimited in sea, which aims to protect biodiversity in a sustainable perspective BUT, for a real efficiency, MPAs need to be integrated in a dense network of representative, individually well-managed and connected MPAs (Mora et al., Science ) How could we estimate the scale of connectivity in marine environment? 26 actual MPAs in the SWIO Connectivity of Marine Protected Areas in South-Western Indian Ocean

Connectivity Genetic differentiation Using population genetics to estimate efficient connectivity: Connectivity of Marine Protected Areas in South-Western Indian Ocean

Marine habitats are often thought as a well-mixed environment with no boundaries. In fact genetic data help to show that dispersal is often very limited: Connectivity of Marine Protected Areas in South-Western Indian Ocean Kinlan & Gaines, 2007 – Ecology: Literature compilation based on genetic data Which is the scale of connectivity for reef fish in the SWIO?

1/ Elaborate a regional strategy of sampling and use population genetics methodology 2/ Better understand actual exchanges between populations and help to localize the most isolated areas 3/ Precise colonisation history of the SWIO 4/ Contribute to the design of the most efficient MPAs network in the SWIO Connectivity of Marine Protected Areas in South-Western Indian Ocean Strategy of our project CAMP:

- Myripristis berndti - Epinephelus merra - Lutjanus kasmira 13 expected sampling sites 2 genetic markers: mitochondrial DNA sequencing & microsatellite genotyping 3 species of fishing interest Connectivity of Marine Protected Areas in South-Western Indian Ocean Strategy of our project:

13 expected sampling sites - Myripristis berndti - Epinephelus merra - Lutjanus kasmira 2 genetic markers: mitochondrial DNA sequencing & microsatellite genotyping 3 species of fishing interest Connectivity of Marine Protected Areas in South-Western Indian Ocean Preliminary results: 6 of the 13 expected sampling sites Is there similar connectivity pattern and/or isolated areas between these 3 species?

Connectivity of Marine Protected Areas in South-Western Indian Ocean We could extract informations from: the morphology of the network Example of haplotype network : 1 black point = 1 haplotype = 1 unique sequence 1 grey bar = 1 mutation 1 color = 1 site the frequency of the different haplotypes the geographical representation of each haplotype

Connectivity of Marine Protected Areas in South-Western Indian Ocean Haplotype network which indicated: A star-like pattern, typical of a population in extension (in agreement with a significant D Tajima ) A main central haplotype = a unique colonisation event Haplotypes homogeneously represented between sites Hd = π = D Tajima = -2.4** Results for Lutjanus kasmira:

Connectivity of Marine Protected Areas in South-Western Indian Ocean Results for Myripristis berndti: A more complex haplotype network with: A divergent branch indicating connection with Pacific fish, that is long- distance connectivity Haplotypes homogeneously represented between sites Hd = π = D Tajima = -1.8** Pacific common haplotypes

Connectivity of Marine Protected Areas in South-Western Indian Ocean Results for Epinephelus merra: Even more complicated network which indicated: A few well-represented haplotypes = ancestral polymorphism retention, giving evidence of multiple colonisation events A significant D Tajima = population still in extension Haplotypes homogeneously reparted between sites Hd = π = D Tajima = -2.1**

For the 3 species: - Different stories : more recent expansion for L. kasmira, more complex for E. merra - A diversity globaly shared between the different sites Connectivity of Marine Protected Areas in South-Western Indian Ocean Comparison of the results for the 3 species → An other genetic indicator is the calculation of Fst, that is fixation index between pair of sites

Connectivity of Marine Protected Areas in South-Western Indian Ocean Fst = Fixation index between populations More Fst → 1, more populations are differentiated Fst Results for the 3 species: SEY

Continue the sampling for the CAMP project in the other SWIO sites Develop the 2 nd genetic marker, i.e. microsatellite, for the 3 species: obtain the best mapping of exchanges between populations Integrate all the genetic results in a global ecological background (oceanic currents, biogeographical boundaries, …) Communicate synthetic results (cartography) to assessment & authorities : Help to understand the MPAs connections and isolated areas Connectivity of Marine Protected Areas in South-Western Indian Ocean Preliminary results give interesting perspectives:

- Thanks for your attention - Many thanks to: - people who help us for fish sampling, - to our main partners: Réserve Naturelle Marine de La Réunion – France Marine Park of Mohéli – Comoros Seychelles Fishing Authority – Seychelles SA Institute of Aquatic Biology – South Africa Mauritius Oceanographic Institute – Mauritius (in progress) - to our financial supports: WIOMSA (MASMA Grant) POCT-OI (Europe, France, La Réunion) TCO Connectivity of Marine Protected Areas in South-Western Indian Ocean