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Green Turtle Population Trends on Eparse Islands: A 20-Year Study

Explore the population status of green turtles in the Eparse Islands over a two-decade period through daily track counts. Discover nesting trends, growth rates, and seasonal patterns.

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Green Turtle Population Trends on Eparse Islands: A 20-Year Study

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

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

  3. STUDY SITES

  4. 1987 – 2006 Tot. nesting females: 2000 to 4000 /yr 1987 – 2006 1984 – 2006 Tot. nesting females: 1000 to 3000 /yr Tot. nesting females: 7000 to 10 000 / yr DAILY GREEN TURTLE TRACK COUNTS

  5. Annual linear growth rate:3.5 [3.4 – 3.6] Annual linear growth rate:2 [1.7 – 2.7] Annual linear growth rate:- 1.6 [-1.8 – -1.3] TREND: SMOOTHING SPLINE ANOVA MODEL

  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%) Mayotte : 2000 – 4000 (1%) Tromelin : 1000 – 3000 (-1.6%) La Réunion : 2 +/- 1 (200%!!! ) Europa : 7000 – 10 000 (2%)

  8. THANK YOU!

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