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Monitoring long term changes in coral and fish communities in the central South Pacific

Monitoring long term changes in coral and fish communities in the central South Pacific. T. LISON DE LOMA, Y. CHANCERELLE, S. PLANES. CRIOBE (Centre de Recherches Insulaires Observatoire de l'Environnement) UMS 3278 CNRS - EPHE - Université de Perpignan

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Monitoring long term changes in coral and fish communities in the central South Pacific

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  1. Monitoring long term changes in coral and fish communities in the central South Pacific T. LISON DE LOMA, Y. CHANCERELLE, S. PLANES CRIOBE (Centre de Recherches Insulaires Observatoire de l'Environnement) UMS 3278 CNRS - EPHE - Université de Perpignan IRCP (Institut des Récifs Coralliens du Pacifique) Moorea - French Polynesia thierry.lison@criobe.pf

  2. Moorea/Tiahura Data records : 1987 to 2010 (23 years) Fish communities • 3 areas - Fringing reef • - Barrier reef • - Outer slope • Twice a year (Spring and Fall) • Number of species • Number of individuals / 100 m 2 Other data • % of substrate cover • Water temperature records • Catastrophic events: • - Acanthaster • - Hurricane • - Bleaching • Human impacts • Reef scape/remote sensing mapping Tiahura area

  3. Temporal increase in total density and SR, BUT… decrease in density of commercial fishes in all habitats.

  4. Polynesia Mana Network • Fish surveys: • - 200 m2 transects • total fish fauna • density • size estimates Coral surveys at different scales: -permanent 1 m2 quadrats -landscape photography (> 10 m) -manta tow (> 100 m)

  5. Polynesia Mana Network Tahiti jetty, Tahiti Faaa, Marutea, Rangiroa Tahiti pass, Tetiaroa Tikehau, Mataiva, Aratika Bora Bora, Takapoto, Nengo Nengo, Tubuai

  6. Monitoring coral reef fish in MPAs Monitoring inside MPAs eliminates confounding effects due to fishing only after stabilization of fish density/biomass Other confounding effects: habitat disturbances

  7. A. planci outbreaks in French Polynesia • minor coral loss and community change with climate-induced disturbances • 96.1 ± 2.0 % decrease in coral cover due to COTS outbreak • ‘natural’ predation far more devastating than climate-induced recurrent bleaching… so far. • habitat structure intact

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