Geographical aspects of informal reef fishery systems in New Caledonia

Jollit, Isabelle; Léopold, Marc; Guillemot, Nicolas; David, Gilbert; Chabanet, Pascale; Lebigre, J.M.; Ferraris, Jocelyne

doi:10.1016/j.marpolbul.2010.06.033

Cited by 21 publications

(14 citation statements)

References 37 publications

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“…Although herbivorous fish represent about 30% [60] to 50% [61] of estimated reef fish catches in New Caledonia, the biomass, density and diversity of each herbivorous group relative to the whole fish community were actually higher in the most heavily fished sites. This effect on the structure of the fish communities strongly suggests that fishing primarily affects fish of higher trophic levels in New Caledonia, and that an exclusive protection of herbivorous fish would unlikely significantly increase algal grazing in coral reefs.…”

Section: Discussionmentioning

confidence: 92%

“…In addition, several of these species, i.e., Siganus argenteus , S. fuscescens , S. woodlandi , Kyphosus spp., are often found in non-reef habitats, in particular algal beds, and a large proportion of the juveniles of at least S. argenteus and S. fuscescens are frequently found in seagrass and algal beds [59]. As seagrass and algal beds are less targeted by fishers than coral reefs in New Caledonia [60], this could favor the persistence of large populations of these species.…”

Section: Discussionmentioning

confidence: 99%

“…We used a human pressure index as a proxy for fishing pressure in the 14 sites (Table 2). First, the coastal human population was calculated, based on the number of inhabitants residing within the maximum distance traveled by fishing boats from the study sites (20 km or 30 km in the case of Aboré reef [60], [61], [99]). This maximum distance was used to estimate the total fishing area (in km 2 ) accessible to the coastal population.…”

Section: Methodsmentioning

confidence: 99%

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Does Herbivorous Fish Protection Really Improve Coral Reef Resilience? A Case Study from New Caledonia (South Pacific)

et al. 2013

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Parts of coral reefs from New Caledonia (South Pacific) were registered at the UNESCO World Heritage list in 2008. Management strategies aiming at preserving the exceptional ecological value of these reefs in the context of climate change are currently being considered. This study evaluates the appropriateness of an exclusive fishing ban of herbivorous fish as a strategy to enhance coral reef resilience to hurricanes and bleaching in the UNESCO-registered areas of New Caledonia. A two-phase approach was developed: 1) coral, macroalgal, and herbivorous fish communities were examined in four biotopes from 14 reefs submitted to different fishing pressures in New Caledonia, and 2) results from these analyses were challenged in the context of a global synthesis of the relationship between herbivorous fish protection, coral recovery and relative macroalgal development after hurricanes and bleaching. Analyses of New Caledonia data indicated that 1) current fishing pressure only slightly affected herbivorous fish communities in the country, and 2) coral and macroalgal covers remained unrelated, and macroalgal cover was not related to the biomass, density or diversity of macroalgae feeders, whatever the biotope or level of fishing pressure considered. At a global scale, we found no relationship between reef protection status, coral recovery and relative macroalgal development after major climatic events. These results suggest that an exclusive protection of herbivorous fish in New Caledonia is unlikely to improve coral reef resilience to large-scale climatic disturbances, especially in the lightly fished UNESCO-registered areas. More efforts towards the survey and regulation of major chronic stress factors such as mining are rather recommended. In the most heavily fished areas of the country, carnivorous fish and large targeted herbivores may however be monitored as part of a precautionary approach.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Does Herbivorous Fish Protection Really Improve Coral Reef Resilience? A Case Study from New Caledonia (South Pacific)

et al. 2013

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“…Reef and lagoon together cover an area of approximately 22,200 km 2 , 86% of which is lagoon. In the eastern lagoon, water depth varies from 40 to 80 m, with a submarine valley (Jollit et al, 2010), and water temperature is generally N25°C. The barrier reef is almost totally submerged except at some locations.…”

Section: Study Areamentioning

confidence: 99%

Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Martias

Tedetti

Lantoine

et al. 2018

Science of The Total Environment

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The eastern lagoon of New Caledonia (NC, Southwest Pacific), listed as a UNESCO World Heritage site, hosts the world's second longest double-barrier coral reef. This lagoon receives river inputs, oceanic water arrivals, and erosion pressure from ultramafic rocks, enriched in nickel (Ni) and cobalt (Co). The aim of this study was to characterize colored dissolved organic matter (CDOM), as well as to determine its main sources and its possible relationships (through the use of Pearson correlation coefficients, r) with biogeochemical parameters, plankton communities and trace metals in the NC eastern lagoon. Water samples were collected in March 2016 along a series of river/lagoon/open-ocean transects. The absorption coefficient at 350nm (a) revealed the influence of river inputs on the CDOM distribution. The high values of spectral slope (S, >0.03m) and the low values of specific ultraviolet absorbance (SUVA, <4Lmg-Cm) highlighted the photodegradation of CDOM in surface waters. The application of parallel factor analysis (PARAFAC) on excitation-emission matrices (EEMs) allowed the identification of four CDOM components: (1) one humic- and one tyrosine-like fluorophores. They had terrestrial origin, exported through rivers and undergoing photo- and bio-degradation in the lagoon. These two fluorophores were linked to manganese (Mn) in southern rivers (r=0.46-0.50, n=21, p<0.05). (2) A tryptophan-like fluorophore, which exhibited higher levels offshore. It would be potentially released from the coral reef. (3) A second tyrosine-like ("tyrosine 2-like") fluorophore. Linked to Prochlorococcus cyanobacteria (r=0.39, n=47, p<0.05), this fluorophore would have an oceanic origin and enter in the lagoon through its southern and northern extremities. It also displayed relationships with Ni and Co content (r=0.53-0.54, n=21, p<0.05). This work underlines the diversity of CDOM sources in the NC eastern lagoon.

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“…Stopping fishing inside reserves could also lead to trophic cascade, increased predation (Fanshawe et al 2003; David et al 2010;Ferraris et al 2005;Guillemot et al 2009;Jollit et al 2010;Preuss et al 2009;Wantiez et al 1997. Guidetti 2006;Saintilan et al 2008), and unforeseen changes in the structure of communities rather than to the reconstruction of targeted populations.…”

Section: Positive Effects On Fish Populations and Ecosystems Inside Fmentioning

confidence: 99%

Integrating Marine Protected Areas in fisheries management systems: some criteria for ecological efficiency

Mesnildrey

Gascuel

Pape

2013

Aquat. Living Resour.

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-Through a review of the scientific literature and a more in-depth qualitative meta-analysis of 16 case studies distributed worldwide, this article aims to study impacts of MPAs on marine living resources, ecosystems and related fisheries and to highlight their criteria of efficiency as management tools for a sustainable exploitation. MPAs are efficient for conservation purposes and resource restoration, especially inside their borders. MPAs can also be part of fisheries management systems, but there is a lack of knowledge about their wider scale impacts on fish stocks, ecosystem and fisheries. Adjacent fisheries can increase their catches near closed areas, but such effects are delayed until after MPA establishment and are often limited over distance. Even though local specificities in ecosystems and fishing resources lead to high variability in MPA effects, four major criteria modulate the efficiency of MPAs for fisheries management: (1) the size of the closed area; (2) the level of protection of essential habitats for exploited resources; (3) MPA integration as part of wider integrated fisheries management plans; and (4) efficient monitoring and regulation systems, including participative decision making, to ensure that restrictive measures are respected.

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Geographical aspects of informal reef fishery systems in New Caledonia

Cited by 21 publications

References 37 publications

Does Herbivorous Fish Protection Really Improve Coral Reef Resilience? A Case Study from New Caledonia (South Pacific)

Does Herbivorous Fish Protection Really Improve Coral Reef Resilience? A Case Study from New Caledonia (South Pacific)

Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Integrating Marine Protected Areas in fisheries management systems: some criteria for ecological efficiency

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