Presentation on theme: "Monitoring long term changes in coral and fish communities in the central South Pacific CRIOBE (Centre de Recherches Insulaires."— Presentation transcript:
Monitoring long term changes in coral and fish communities in the central South Pacific firstname.lastname@example.org 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 T. LISON DE LOMA, Y. CHANCERELLE, S. PLANES
Tiahura area 3 areas - Fringing reef 3 areas - Fringing reef - Barrier reef - Barrier reef - Outer slope - Outer slope Twice a year (Spring and Fall) Twice a year (Spring and Fall) Number of species Number of species Number of individuals Number of individuals 100 m 2 % of substrate cover % of substrate cover Water temperature records Water temperature records Catastrophic events: Catastrophic events: - Acanthaster - Acanthaster - Hurricane - Bleaching Human impacts Human impacts Reef scape/remote sensing mappingReef scape/remote sensing mapping Fish communities Other data / Moorea/Tiahura Data records : 1987 to 2010 (23 years)
Temporal increase in total density and SR, BUT… decrease in density of commercial fishes in all habitats.
Polynesia Mana Network Coral surveys at different scales: -permanent 1 m2 quadrats -landscape photography (> 10 m) -manta tow (> 100 m) Fish surveys: - 200 m2 transects -total fish fauna -density -size estimates
Monitoring coral reef fish in MPAs Other confounding effects: habitat disturbances Monitoring inside MPAs eliminates confounding effects due to fishing only after stabilization of fish density/biomass
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