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GREEN TURTLES IN THE EPARSE ISLANDS: POPULATION STATUS BASED ON 20 YEARS TREND OF DAILY TRACK COUNTS 29th Annual Symposium on Sea Turtle Biologie & Conservation.

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Presentation on theme: "GREEN TURTLES IN THE EPARSE ISLANDS: POPULATION STATUS BASED ON 20 YEARS TREND OF DAILY TRACK COUNTS 29th Annual Symposium on Sea Turtle Biologie & Conservation."— Presentation transcript:

1 GREEN TURTLES IN THE EPARSE ISLANDS: POPULATION STATUS BASED ON 20 YEARS TREND OF DAILY TRACK COUNTS 29th Annual Symposium on Sea Turtle Biologie & Conservation Brisbane, 17 – 19 February 2009 Jérôme Bourjea, Cyril Marmoex, Marie Lauret-Stepler and Stéphane Ciccione

2 THE 5 FRENCH EPARSE ISLANDS IN THE SWIO GLORIEUSES TROMELIN JUAN DE NOVA EUROPA BASSAS DE INDIA

3 STUDY SITES

4 DAILY GREEN TURTLE TRACK COUNTS 1987 – 2006 Tot. nesting females: 2000 to 4000 /yr 1987 – 2006 Tot. nesting females: 1000 to 3000 /yr 1984 – 2006 Tot. nesting females: 7000 to / yr

5 TREND: SMOOTHING SPLINE ANOVA MODEL Annual linear growth rate: 2 [1.7 – 2.7] Annual linear growth rate: 3.5 [3.4 – 3.6] Annual linear growth rate: [-1.8 – -1.3]

6 SEASONALITY PATTERN (Mean tracks per month over the period)

7 MAIN NESTING GREEN TURTLE POPULATION STATUS IN THE SWIO Moheli : 4000 – 6000 (20%) Glorieuses : 2000 – 4000 (3.5%) Tromelin : 1000 – 3000 (-1.6%) Mayotte : 2000 – 4000 (1%) La Réunion : 2 +/- 1 (200%!!! ) Europa : 7000 – (2%)

8 THANK YOU!


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