Identification of key marine areas for conservation based on satellite tracking of post-nesting migrating green turtles (Chelonia mydas)
Résumé
The green turtle (Chelonia mydas) is classified as an endangered species on the IUCN Red List since 1986.
This species is especially threatened in South America due to bycatch by fisheries along the northeastern
coasts. It is particularly crucial to identify specific marine areas for conservation measures to safeguard
green turtle rookeries in Suriname and French Guiana. Our study provides valuable information to attain
this goal, describing the satellite tracking of post-nesting migration routes used by 16 green turtles fitted
with Argos/GPS Fastloc satellite tags at the end of the nesting season. The data we obtained show a single
migratory corridor: all the turtles followed a similar eastward route along the Guianan and the Brazilian
coast. The GPS signal was lost for two individuals a few weeks after tracking commenced, suggesting that
they were caught by fishermen. Thirteen turtles reached the coast of the state of Ceará (Brazil), where
they spent at least one month. One turtle continued 700 km further to the coastal regions of Natal and
Recife (Brazil), which are known feeding areas of the green turtle populations nesting on Ascension
Island. The migratory corridor is essentially narrow, with a width of 22 km for most of the distance
covered. It constitutes a major dynamic link between the nesting and feeding areas and crosses three
Regional Management Units of the Atlantic basin. Since green turtles face a high risk of being caught
in fishing nets, measures of protection should be implemented along this corridor.