title: Localised and limited impact of a dredging operation on coral cover in the northwestern lagoon of New Caledonia.
abstract: We report here an interannual survey (2006-2012) of coral cover in the northwestern lagoon of New Caledonia, to assess the impact of an important dredging operation (August 2008-February 2010) associated with the construction of the largest nickel mining site in the Pacific. A BACI (Before-After Control-Impact) analysis failed to detect any significant interaction between period (before, during, and after dredging) and the category of the stations (impact vs. control). Among the 31 stations surveyed, only seven showed decreasing coral cover during the study period, mainly due to a decline in Acroporidae. However, the relationship between the dredging and this decrease was highly plausible only for one station, situated 0.9km from the dredging site. High hydrodynamism in the study area, the abundance of resistant corals and efficient protective measures during the dredging operation might explain these localised and limited impacts.
authors.affiliation: Institut de Recherche pour le Développement, UMR 9220 ENTROPIE & Laboratoire d'Excellence CORAIL, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan, France. Electronic address: mehdi.adjeroud@ird.fr.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Adjeroud
authors.affiliation: Soproner, 1bis rue Berthelot, BP 3583, 98846 Nouméa Cedex, New Caledonia.
authors.forename: Antoine
authors.initials: A
authors.lastname: Gilbert
authors.affiliation: Soproner, 1bis rue Berthelot, BP 3583, 98846 Nouméa Cedex, New Caledonia.
authors.forename: Mathilde
authors.initials: M
authors.lastname: Facon
authors.affiliation: Soproner, 1bis rue Berthelot, BP 3583, 98846 Nouméa Cedex, New Caledonia.
authors.forename: Marion
authors.initials: M
authors.lastname: Foglia
authors.affiliation: AEL Environnement, Anse Vata, 101 Promenade Roger Laroque, 98800 Nouméa, New Caledonia.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Moreton
authors.affiliation: Soproner, 1bis rue Berthelot, BP 3583, 98846 Nouméa Cedex, New Caledonia.
authors.forename: Tom
authors.initials: T
authors.lastname: Heintz
mesh_terms: D000818:Animals; D037421:Anthozoa / Q000502:physiology*; D057894:Coral Reefs; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis*; D008906:Mining; D009510:New Caledonia
keywords: Coral reefs; Dredging; Interannual variability; Monitoring; New Caledonia; Scleractinian corals