ìCOCA-LOCA : Connectivity of Loggerhead turtle (Caretta caretta) in Western Indian Ocean, implementation of local and regional management measuresMayeulDalleau,Maxime Lalire,CélineTardy,Suaad AlHarthi,AndrewWillson,MarcosPereira,RaquelFernandes,RonelNel,Berthin Rakotonirina,SebastienJaquemet,Stéphane Ciccione,PhillipeGaspar,Jérôme Bourjea

mayeuldalleau@cedtm-asso.org

TheCOCALOCAprojectispartoftheEuropeanBESTinitiativeandisfundedbytheAFD(AgenceFrançaisedeDéveloppement)

COCA-LOCA Project

ì EuropeanBESTInitiative– 2012-20ì FundedbyAFDì ManagedbyIUCN

ì ProjectHoldersì Centred’Etude etdeDécouverte desTortues Marines- CEDTMì Collecte Localisation Satellite- CLS

ì ProjectNationalPartnersì Kéloniaì Ifremerì UniversityofLaRéunionì CapRun

ì Oman

ì South-Africa

ì Mozambique

ì Madagascar

ì International

International Project Partners

The classic historic model for loggerheads

ì NorthAtlantic- NorthPacific- SouthPacific

Carr1987,Bowenetal. 1995,Bolten etal.1998,Lohmann etal. 2001,BowenandCarl2007,Boyleetal. 2009,Putnametal. 2012,Mansfieldetal.2014,…

What so special about the Indian Ocean ?

ì Monsoonseasons

ì Somalian current

ì South-equatorialcurrent

ì AgulhasCurrent

ì Benguela Current

adaptedfrom SchottandMc Creary 2001,SWOT

ReunionIsland

LoggerheadSea TurtleNesting sites

Loggerhead juvenile spatial cycle in the Indian Ocean ?

ì WhatisthespatialcycleofthemainloggerheadspopulationsoftheIndianOcean?

Study Sites

ì x2majornestingpopulationsì Omanì SouthAfrica/Mozambique

ì x1juvenilegroupì ReunionIsland

(longline fisheriesbycatch)

ì x2RegionalManagementUnits

Methods

ì Amultidisciplinaryapproach– 4methodsì Satellitetracking

ì ReunionIsland(n=22)

ì Geneticsì Oman(107),Mozambique(68),Reunion(96)

ì Lagrangian DriftModelingì Oman,SouthAfrica/Mozambique

ì StableIsotopesì Oman(39),Mozambique(51),Reunion(24)

ì >90%ofReunion Islandjuveniles migratedNorth

ì Tracking durationì 158days ± 112ì Maximum:401days

ì Migrationdistanceì 2584km± 1354ì Maximum:4591km

1. Satellite tracking

South->Northmovement

ì mT-DNAlongsequence(817bp)

ì >83%ofReunion Islandindividuals havethehaplotype signatureoftheOmannestingpopulation

2. GeneticsNorth->Southmovement

ì ImportanceoftheSubtropicalConvergenceZone

ì Multiplecycles

3. Modeling

-North->Southmovement-Southsubtropicalconvergencezone

Subtropicalconvergencezone

A juvenile cycle in the Indian Ocean !

ì TakeHomeì Trans-equatorialì SouthSubtropical

ConvergenceZone

Genetics

Modeling

Isotopes

Tracking

1- Bycatch 2- Operation 3- Care Center

4- Communication 5- SatelliteTracking 6- Release

©Kélonia

©Ifremer,Kélonia,CapRun,L.Bêche,J.Bourjea,H.Sauvignet

Local management of longline fisheries

Local management of longline fisheries

ì SeaTurtleReleaseKits

ì Workshopswithfishermen

ì Communicationì Fisheryjournalì Localandnationalpress

Local management of longline fisheries

ì SeaTurtleCareDatabaseì Kélonia CareCenterì http://soins-kelonia.org/

Regional conservation implication

ì RegionalReportsì Bycatchì Plasticdebris

ì InternationalWorkshopì Açoresì Madeiraì Canary

Regional conservation implication

ì Scientificpapers&Internationalsymposiumsì InternationalSeaTurtleSociety- ISTSì WesternIndianOceanMarineScience

Association-WIOMSAì RedList&RegionalManagementUnits

(RMUs)ì Global:Vulnerableì SouthWestIndianOceanRMU:Near

Threatenedì NorthWestIndianOceanRMU:Critically

Endangered↘70%decline thelast30years,↘90%possibledecline till2040

ì MarineTurtleSpecialistGroup

RegionalManagementUnits

Improving Knowledge What’s ?

ì Trackinginthesouthernsubtropicalconvergencezoneì CollaborationwithIPMAPortuguesefisheriesobservers

Improving Knowledge – First results

ì Northwardmigrationì towards

Omanì 2indiv.

ì Contranatantmigrationì Towards

Indonesiaì 1indiv.

Management Actions - What’s ?

ì MasterThesisonplasticdebrisoriginì Reportabouttheuseofseaturtlereleasekitsì Kitsimprovementì Workshopswithlonglinefisheriesì Fisheryobserversseaturtlesbycatchanalysisì AlabelfortheReunionlonglinefishery?

ìCOCA-LOCA : Connectivity of Loggerhead turtle (Caretta caretta) in Western Indian Ocean, implementation of local and regional management measuresMayeulDalleau,Maxime Lalire,CélineTardy,Suaad AlHarthi,AndrewWillson,MarcosPereira,RaquelFernandes,RonelNel,Berthin Rakotonirina,SebastienJaquemet,Stéphane Ciccione,PhillipeGaspar,Jérôme Bourjea

mayeuldalleau@cedtm-asso.org

TheCOCALOCAprojectispartoftheEuropeanBESTinitiativeandisfundedbytheAFD(AgenceFrançaisedeDéveloppement)

ThanksForWatching!