ContentsDiapositives Leatherbacks in South-America Leatherbacks in Venezuela and Trinidad and Tobago Leatherbacks in Colombia Leatherbacks in Guyana Leatherbacks in Suriname Leatherbacks in French Guiana Leatherbacks in Brazil Situation in French Guiana andGN=LEFT>Situation in French Guiana and Suriname The reality of the Surinamian and Guianan population... ... is probably largely dependent on the time scale of the analysis Nests in Suriname and French Guiana for 34 years Nests in Suriname and French Guiana for 34 years: synthesis South-American studies The spatial scale for studies From nest number to female number… the way is difficult Temporal fluctuations in these parameters could be of major importance Statistical caveats when using the nest numbers as a turtle abundance index A way to correct for this relationship Temporal autocorrelation on the nest number Example: Correlation between nest numbers for 15 years in Guianas and Sandy-Point (US Virgind Sandy-Point (US Virgin Islands) What is the reason of the correlation ? Test of the phase shifts similarities The correlation between Guianas and Sandy-Point temporal series of nest numbers was simply due to the temporal autocorrelation which produced a similar +-+-+-+ pattern of nest numbers in both locations. As the temporal autocorrelation is simply a consequence of the reproductive biology of leatherbacks that nest every two years on average, the only correct conclusion is simply that leatherback nests were analyzed in both locations ! Conclusion for South-American leatherbacks The necessary tools for leatherback studies Acknowledgments |
Auteur: Marc Girondot |