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  • Évaluation de la distribution spatiale d’une espèce d’holothurie (Holothuria fuscogilva) dans le lagon de Vairao (Tahiti).
Évaluation de la distribution spatiale d’une espèce d’holothurie (Holothuria fuscogilva) dans le lagon de Vairao (Tahiti).

Évaluation de la distribution spatiale d’une espèce d’holothurie (Holothuria fuscogilva) dans le lagon de Vairao (Tahiti).

Surexploitées pour le marché asiatique, les holothuries blanches à mamelles (Holothuria fuscogilva) sont désormais reconnues vulnérables (liste rouge de l’UICN) et sont inscrites à la CITES (Annexe II). Pour participer à la conservation de cette espèce, il est primordial de comprendre le comportement de l’animal dans son milieu sauvage, sa distribution et son stock. L’étude se déroule à Vairao (côte sud-ouest de Tahiti), où est basée l’écloserie d’holothurie. Les évaluations sous-marines ont permis de localiser 10 sites propices à l’agrégation de l’espèce. Ces sites représentent 15% de la surface totale du lagon et sont catégorisés en 3 types de zones géomorphologiques : les abords de passe, les chenaux profonds et la pente interne du lagon. Les résultats démontrent une densité de 53 ind./Ha aux abords de passe, 41 ind./Ha dans les chenaux et 125 ind./Ha aux pentes internes, soit une densité moyenne comprise entre de 65 ind./ Ha (estimation basse) et 73 ind./Ha (estimation haute).

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