Éditeur(s) : HAL CCSD
https://hal.archives-ouvertes.fr/hal-01629922

hal-01629922
https://hal.archives-ouvertes.fr/hal-01629922

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The emerging orbicular batfish (Platax orbicularis) aquaculture is the most important fish aquacultureindustry in French Polynesia. However, bacterial infections are causing severe mortality episodes.Therefore, there is an urgent need to find an effective management solution. Besides the supplyingdifficulty and high costs of veterinary drugs in French Polynesia, batfish aquaculture takes place close tothe coral reef, where use of synthetic persistent drugs should be restricted. Medicinal plants andbioactive algae are emerging as a cheaper and more sustainable alternative to chemical drugs. We havestudied the effect of local Polynesian plants and the local opportunistic algae Asparagopsis taxiformis onbatfish when orally administered. Weight gain and expression of two immune-related genes (lysozyme ge Lys G and transforming growth factor beta - TGF-b1) were studied to analyze immunostimulant activityof plants on P. orbicularis. Results showed that several plants increased Lys G and TGF-b1 expressionon orbicular batfish after 2 and 3 weeks of oral administration. A. taxiformis was the plant displaying themost promising results, promoting a weight gain of 24% after 3 weeks of oral administration andsignificantly increasing the relative amount of both Lys G and TGF-b1 transcripts in kidney and spleen ofP. orbicularis.
ISSN: 1050-4648

hal-01381334
https://hal-univ-perp.archives-ouvertes.fr/hal-01381334
DOI : 10.1016/j.fsi.2016.09.011

Éditeur(s) : HAL CCSD
Résumé : National audience
La Phytothérapie Européenne

hal-01197430
https://hal-univ-perp.archives-ouvertes.fr/hal-01197430

Éditeur(s) : HAL CCSD National Shellfisheries Association
Résumé : International audience
Monitoring gonad maturation for protandrous and functional hermaphrodite species such as the giant clam Tridacna maxima is difficult due to the juxtaposition and relative proportion of male and female tissues in the gonad [gonadal sex ratio (GSR)]. Here, the relevance of the widely used gonadosomatic index (GSI) as proxy of giant clam gonad maturation is tested with a large dataset (n ¼ 265). Gonadosomatic index is compared with other indices, namely the proportion of the male part harboring spermatozoids, the proportion of empty oocyte follicles, the mean oocyte diameter, and the oocyte elongation. At gonad scale, high index variability highlighted partial spawning. At individual scale, male and female maturation proxies were contrasted, showing either asynchronous emissions of male and female gametes or contrasted spermatogenesis and oogenesis duration. The GSI was mostly driven by the number and diameter of oocytes and therefore it is recommended here as primary proxy for female maturity. Except for the oocyte elongation, all indices were affected by the GSR, which ruled out drawing conclusions at population scale. These results highlight the need for maturation stage proxies that are optimized for functional hermaphrodite species.
ISSN: 0730-8000

hal-01613648
https://hal.archives-ouvertes.fr/hal-01613648
https://hal.archives-ouvertes.fr/hal-01613648/document
https://hal.archives-ouvertes.fr/hal-01613648/file/Gaertner-Mazouni-2016-eio.pdf
DOI : 10.2983/035.035.0107

Éditeur(s) : HAL CCSD Instituto Oswaldo Cruz, Ministério da Saúde
Résumé : International audience
Leishmania are protozoan parasites that show remarkable diversity, as revealed by the various clinical forms of leishmaniasis,which can range from mild skin lesions to severe metastatic cutaneous/mucosal lesions. The exact nature andextent of Leishmania phenotypic diversity in establishing infection is not fully understood. In order to try to understandsome aspects of this diversity, we subcutaneously infected BALB/c mice with first and second generation subclones of aL. amazonensis strain isolated from a patient (BA125) and examined in vivo lesion growth rate and antimony susceptibility.In vivo fast-, medium- and slow-growing subclones were obtained; moreover, fast-growing subclones could generateslow-growing subclones and inversely, revealing the continuous generation of diversity after passage into mice. Noantimony-resistant subclone appeared, probably a rare occurrence. By tagging subclone cells with a L. amazonensisgenomic cosmid library, we found that only a very small number of founding cells could produce lesions. Leishmaniaclones transfected with in vivo selected individual cosmids were also diverse in terms of lesion growth rate, revealing thecosmid-independent intrinsic characteristics of each clone. Our results suggest that only a few of the infecting parasitesare able to grow and produce lesions; later, within the cell mixture of each lesion, there coexist several parasite populationswith different potentialities to grow lesions during the next infection round. This may reflect a sort of programmedheterogeneity of individual parasites, favoring the survival of some individuals in various environmental conditions.
ISSN: 0074-0276

hal-01557855
https://hal-univ-perp.archives-ouvertes.fr/hal-01557855
DOI : 10.1590/0074-02760160280

Éditeur(s) : HAL CCSD Biopress Limited
Résumé : International audience
Obligately epizoic diatoms (Bacillariophyta) on vertebrates were first described from cetaceans, but turtles, both freshwater and marine, also host very specific floras. Several scrapings of juvenile Chelonia mydas have allowed the description of two new diatom taxa whose valves are asymmetrical about the transapical axis, Tripterion societatis sp. nov. and Chelonicola caribeana sp. nov. These taxa are very small and show some morphological plasticity. Such plasticity might suggest their inclusion in genera with slightly different characteristics from Tripterion and Chelonicola as originally delimited. Based on our observations, an emended diagnosis is proposed for Chelonicola.
ISSN: 2159-8347

hal-01500418
https://hal.archives-ouvertes.fr/hal-01500418
DOI : 10.1080/0269249X.2017.1299042

Éditeur(s) : HAL CCSD Springer
Résumé : International audience
With the development of genetics methods, it becomes possible to study the population structure and some aspects of the reproductive behaviour of endangered sharks. Here we describe the isolation of 20 polymorphic microsatellite markers in the bull shark Carcharhinus leucas (Carcharhinidae) and their characteristics. Two to 10 alleles per locus were detected. Observed and expected heterozygosities ranged from 0.00 to 0.78 and from 0.05 to0.80, respectively. Four markers showed deviations from Hardy–Weinberg equilibrium; among them, three showed presence of null alleles. No linkage disequilibrium was detected among any of the loci. Moreover, four, 11 and 19 of these 20 markers successfully cross-amplified in the tiger shark Galeocerdo cuvier, the sandbar shark Carcharhinus plumbeus and the dusky shark Carcharhinus obscurus, respectively.
ISSN: 1877-7252

hal-01253773
https://hal.archives-ouvertes.fr/hal-01253773
https://hal.archives-ouvertes.fr/hal-01253773/document
https://hal.archives-ouvertes.fr/hal-01253773/file/Pirog%20et%20al.%20-%202015%20-%20Isolation%20and%20characterization%20of%2020%20microsatellit_hal.pdf
DOI : 10.1007/s12686-014-0308-3

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Despite the increasing dominance of turf algae in coral reefs, few studies have investigated their physiological and ecological responses to changes in abiotic factors. We tested the effects of depth and ultraviolet radiation on turf algae at different levels of successional stages using two experiments. Depth-related differences were found for all turf algal communities, characterized by a higher amount of the cyanobacteria taxon Dichothrix and the red filamentous genera Poly-/Herposiphonia in the shallow and the appearance of oscillating cyanobacteria in deeper waters. In the first experiment, cross-depth transplantation of 153 days old communities influenced percentage cover, biomass and taxa composition. Downward transplantation lowered overall biomass and abundance of the foraminifera Sorites, whereas the crustose green alga Pringsheimiella and filamentous cyanobacteria colonized the communities. A nearly reverse pattern was observed in upward transplanted communities. Overall we distinguished between sensitive taxa, like Oscillatoria, and taxa able to acclimate to alterations in their environment, like Pringsheimiella, Poly/Herposiphonia and Dichothrix. In the second experiment, algae grown for 285 days at 5 m were exposed together with a set of sterile settlement tiles to three UVR regimes at 2 m for 22 days. UVR had no effect on turf algal communities regardless of successional stage. This study highlights the presence of high light and UV tolerant species. The high UV tolerance of turf communities may confer a competitive advantage over other more sensitive coral reef biota, such as corals. This study demonstrates that turf algae are dynamic communities exhibiting species-specific resistance to environmental changes.
ISSN: 0022-0981

hal-01333486
https://hal-univ-perp.archives-ouvertes.fr/hal-01333486
DOI : 10.1016/j.jembe.2014.07.017

Éditeur(s) : HAL CCSD Paris : Muséum national d'histoire naturelle
Résumé : International audience
Coral reefs are one of the most diverse ecosystems on Earth and sustain millions of people worldwide.However, coral reefs are temporally dynamic and fragile systems subject to ever increasing disturbancesof anthoropogenic and natural origins. Understanding the patterns and trajectories of changes through time isurgently needed to estimate the resilience of coral reefs. To ascertain these patterns, we depend on the availabilityof long-term datasets, which are seldom available. In this study, we present the data set which allowed us to analysethe long-term trends of coral and fish assemblages for the island of Moorea (French Polynesia) from 1983to 2014, a dataset spanning 32 years, comprising two Acanthaster planci outbreaks (1987 and 2006) and severalhurricanes (1982, 1983, 1991 and 2010), on three permanent monitoring sites (quadrats of 50 × 2 m2) located onboth fringing and barrier reefs as well as on the outer slope. Coral cover oscillated significantly over time, particularlyon the outer slope where it suffered greatly from the effects of A. planci outbreaks and hurricanes. Totalfish and commercial fish abundances varied significantly across the three habitats. Prior to 2000, both total fishand herbivorous fish abundances increased on the barrier reef while after this time, numbers began to drop significantlyalong the outer slope. Species richness for total, commercialized and herbivorous fish increased over thesampling period for all three habitats. There were varied responses amongst species to disturbances on the outerslope over the sampling period: while some tended to disappear for a while before reappearing, others showed apeak in abundance in the middle of the sampling period, and still others increased or decreased continuously orwere stable over time. Our results support the view that coral reefs are highly dynamic systems and that differentfunctional groups show different temporal trajectories. While disturbance is probably the major driver for coralcover dynamics, its impact is less obvious for fish, possibly due to their mobility and population dynamics whichmay mask the effect of disturbance.
Les récifs coralliens sont des systèmes dynamiques et diversifiés régulièrement soumis à des perturbationsnaturelles et anthropiques, sources d’hétérogénéité spatiale et temporelle dans la structure et la dynamique deces communautés d’organismes que sont, entre autres, les poissons et les coraux. Récemment, il a été démontréque les activités humaines pouvaient modifier les régimes naturels de perturbations des récifs coralliens en transformantles événements ponctuels en perturbations persistantes ou en stress chronique, soit en introduisant denouveaux types de perturbations, soit en ajoutant ou altérant certaines perturbations naturelles nécessaires au bonmaintien de la dynamique inhérente aux récifs. Dans cette étude, nous présentons la base de données qui nouspermettra d’analyser les tendances à long-terme des assemblages de poissons et de coraux de l’île de Moorea(Polynésie française) entre 1983 et 2014 sur une période de 32 ans, comprenant deux proliférations d’Acanthasterplanci (1987 et 2006) et plusieurs cyclones (1982, 1983, 1991 et 2010), sur trois sites de suivi permanents(quadrats de 50 × 2 m2) sur les récifs barrière et frangeant ainsi que sur la pente externe. La couverture corallienneprésente de fortes oscillations, en particulier sur la pente externe où elle a répondu fortement à la proliférationd’A. planci et des cyclones. Les abondances des poissons totaux et des poissons commercialisés montrent destendances contrastées sur les trois habitats, avec, plus particulièrement, une augmentation sur le récif barrière etune diminution sur la pente externe après 2000. Ces tendances se retrouvent chez les poissons herbivores dansces deux habitats. La richesse spécifique des poissons totaux, commerciaux et herbivores, augmente de façoncontinue au cours de la période d’étude dans les trois habitats. Des groupes particuliers d’espèces répondentdifféremment aux perturbations de la pente externe au cours du suivi : alors que certaines espèces ont tendanceà disparaître pendant quelques années avant de réapparaître, d’autres présentent un pic en terme d’abondanceen milieu de suivi ; d’autres espèces ont des abondances qui augmentent ou diminuent de façon continue, etd’autres encore montrent des abondances stables. Ceci indique que les récifs coralliens sont des systèmes trèsdynamiques dans lesquels les perturbations naturelles peuvent affecter les espèces de façon différente. Alors quele régime de perturbations naturelles semble être important pour la dynamique de la couverture corallienne danscertains habitats, cela se retrouve beaucoup moins pour les poissons. Cette atténuation des fluctuations spatialeset temporelles peut être due aux aptitudes de dispersion de nombreuses espèces de poissons, capables de chercherun autre habitat favorable en cas de perturbation de l’habitat corallien d’origine.
ISSN: 0399-0974

hal-01282378
https://hal-univ-perp.archives-ouvertes.fr/hal-01282378

Éditeur(s) : HAL CCSD The Company of Biologists
Résumé : International audience
The ability to produce sound has been known for decades inBalistidae. Sounds of many species have been recorded and a varietyof sound-producing mechanisms have been proposed, includingteeth stridulation, collision of the buccal teeth and movements of thefins. The best-supported hypothesis involves movements of thepectoral fin against the lateral part of the swimbladder, called adrumming membrane. In this study, we describe for the first time thesounds made by the blackbar triggerfish Rhinecanthus aculeatus,which are like short drum rolls with an average duration of 85 ms,193 Hz dominant frequency and 136 dB SPL level at 3 cm distance.The sounds are a series of pulses that result from alternate sweepingmovements of the right and left pectoral fins, which push a system ofthree scutes that are forced against the swimbladder wall. Pulses fromeach fin occur in consecutive pairs. High-speed videos indicate thateach pulse consists of two cycles. The first part of each cyclecorresponds to the inward buckling of the scutes, whereas the secondpart of the cycle corresponds to an apparent passive recoil of thescutes and swimbladder wall. This novel sound productionmechanism is probably found in many members of Balistidaebecause these peculiar scutes occur in other species in the family.Comparison of sound characteristics from fishes of different sizesshows that dominant frequency decreases with size in juveniles butnot in adults.KEY WORDS: Acoustic, Communication, Swimbladder
ISSN: 00220949

hal-01472506
https://hal-univ-perp.archives-ouvertes.fr/hal-01472506
DOI : 10.1242/jeb.146514

Éditeur(s) : HAL CCSD Instituto Oswaldo Cruz, Ministério da Saúde
Résumé : International audience
Leishmania are protozoan parasites that show remarkable diversity, as revealed by the various clinical forms of leishmaniasis, which can range from mild skin lesions to severe metastatic cutaneous/mucosal lesions. The exact nature and extent of Leishmania phenotypic diversity in establishing infection is not fully understood. In order to try to understand some aspects of this diversity, we subcutaneously infected BALB/c mice with first and second generation subclones of a L. amazonensis strain isolated from a patient (BA125) and examined in vivo lesion growth rate and antimony susceptibility. In vivo fast-, medium- and slow-growing subclones were obtained; moreover, fast-growing subclones could generate slow-growing subclones and inversely, revealing the continuous generation of diversity after passage into mice. No antimony-resistant subclone appeared, probably a rare occurrence. By tagging subclone cells with a L. amazonensis genomic cosmid library, we found that only a very small number of founding cells could produce lesions. Leishmania clones transfected with in vivo selected individual cosmids were also diverse in terms of lesion growth rate, revealing the cosmid-independent intrinsic characteristics of each clone. Our results suggest that only a few of the infecting parasites are able to grow and produce lesions; later, within the cell mixture of each lesion, there coexist several parasite populations with different potentialities to grow lesions during the next infection round. This may reflect a sort of programmed heterogeneity of individual parasites, favoring the survival of some individuals in various environmental conditions.
ISSN: 0074-0276

hal-01489008
https://hal-univ-perp.archives-ouvertes.fr/hal-01489008

Éditeur(s) : HAL CCSD Pacific-credo Publications
Résumé : International audience
Les sciences humaines et sociales dans le Pacifique Sud, terrain questions et méthodes

ISBN : 978-2-9537485-2-9
hal-01342961
https://hal-univ-perp.archives-ouvertes.fr/hal-01342961

Éditeur(s) : HAL CCSD Magnolia Press
Résumé : International audience
A new species of wrasse, Macropharyngodon pakoko, is described from the Marquesas Islands, bringing the total number of species of the genus Macropharyngodon to 12. Macropharyngodon pakoko was found at depths from 0-42 m and is endemic to the Marquesas Islands. Macropharyngodon pakoko is similar to M. meleagris, which is widely distributed from the central and western Pacific to Cocos-Keeling in the Indian Ocean, but differs genetically and in several coloration characters: males with irregularly curved black humeral blotch with incomplete iridescent blue border; inverted irregular " U "-shaped band on the cheek; a small black spot at the upper base of the pectoral fin; and background color of the body greenish with faint bluish black spots on each scale. Females lack black pigment on the chest posterior to the ventral attachment of the gill membranes; reddish black blotches on the body are widely spaced, particularly on the head where they are more reddish and half the size of those on body; caudal fin with small, bright yellow spots arranged in narrow vertical bands with pale interspaces; pelvic fins pale with three reddish yellow cross-bands; a small black spot at the upper base of the pectoral fin; and small reddish spots along the base of the anal fin. Juveniles have irregular black blotches on the body, a small black spot instead of an ocellus posteriorly on the dorsal fin and lack large black spots and ocellus on the anal fin.
ISSN: 1175-5326

Droits : http://creativecommons.org/licenses/by/
hal-01333340
https://hal-univ-perp.archives-ouvertes.fr/hal-01333340
https://hal-univ-perp.archives-ouvertes.fr/hal-01333340/document
https://hal-univ-perp.archives-ouvertes.fr/hal-01333340/file/7387-23089-2-PB.pdf
DOI : 10.11646/zootaxa.3857.3.6

Éditeur(s) : HAL CCSD Elsevier Masson
Résumé : International audience
In vertebrates, brain functional asymmetries are widespread and increase brain performance. Some species of fishes are known to have brain asymmetries; however, little information is available on brain lateralization in coral reef fishes and the impact this could have during the recruitment phase. In this study, soldierfish, Myripristis pralinia, at the larval and juvenile stage recognized conspecifics through visual cues. Larvae with the ablation of either the right or left telencephalic hemisphere lost the attraction towards conspecific cues. In contrast, juveniles with the ablation of the right (but not left) telencephalic hemisphere still displayed a preference towards conspecific visual cues. These results suggest the left telencephalic hemisphere is responsible for the lateralization process used in the visual recognition of coral reef fish juveniles. The determinism of lateralized perception of conspecifics during fish ontogeny may be a consequence of genetic factors, linked with the metamorphosis processes and/or environmental factors such as predation at recruitment.
ISSN: 0003-3472

hal-01340504
https://hal-univ-perp.archives-ouvertes.fr/hal-01340504
DOI : 10.1016/j.anbehav.2016.04.011

Éditeur(s) : HAL CCSD L'Harmattan
Résumé : International audience
Gouvernance, enjeux et mondialisation des grandes aires marines protégées : recherche sur les politiques environnementales de zonage maritime : le challenge maritime de la France de Méditerranée et d'Outre-mer

ISBN : 978-2-343-04160-5
hal-01304361
https://hal-univ-perp.archives-ouvertes.fr/hal-01304361

Éditeur(s) : HAL CCSD Inter-Research
Résumé : International audience
The effects of global change are particularly serious in areas where range shiftsof species are physically constrained such as the Ligurian Sea, which is one ofthe coldest sectors of the Mediterranean. In this basin, historical informationon water temperature (from the sea surface down to 75 m depth) dates backto the 1950s. Early studies also recorded warm-water species occurrence.Thanks to these data we provide the first detailed characterization of watertemperature variation from 1958 up to 2010 in the layer 0–75 m depth. Wecoupled this analysis with the available information on rocky reef epibenthiccommunities (literature review from 1955 to 1964 and field data from 1980 to2010). The analysis of water temperature revealed several patterns of variation:a cooling phase from 1958 to 1980, a phase of rapid warming from 1980 to1990 and a phase of slower warming from 1990 to 2010. Inter-annual variationin temperature increased over the entire period for the water layer down to20 m. Warm-water native and alien species richness increased during thewarming phases. Literature estimates suggest a decrease in warm-water nativespecies richness during the cooling phase. The analysis of quantitative data collectedin the early 1990s and late 2000s indicated a decrease in the cover ofwarm-water native species on shallow rocky reefs and an increase in deeperwaters. We argue that increased inter-annual variation in water temperaturemay disadvantage native warm-water species in shallow waters. Our resultsindicate that the effect of temperature rises in cold, constrained basins may bemore complex than the simple prediction of species changing their geographicalrange according to their thermal limits.
Marine Ecology Progress Series

hal-01239259
https://hal-univ-perp.archives-ouvertes.fr/hal-01239259
DOI : 10.1111/maec.12277

Éditeur(s) : HAL CCSD Springer
Résumé : International audience
Centropyge bispinosa is one of the most frequently coral reef fish exported through the aquarium trade. We developed fifteen microsatellite markers to evaluate possible distinct breeding stocks throughout its Indo-Pacific distribution range. Number of alleles varied from 2 to 50 per locus, observed and expected heterozygosities ranged from 0.486 to 0.953 and 0.482 to 0.974 respectively. Significant deviations from HWE were detected in two loci. Cross-amplifications were tested in four congener species: C. loriculus, C. bicolor, C. flavissima and C. vroliki. The 15 new microsatellite loci will be helpful tools for the identification of breeding units, connectivity studies, as well as phylogenetic relationships among pygmy angelfishes.
ISSN: 1877-7252

hal-01341716
https://hal-univ-perp.archives-ouvertes.fr/hal-01341716
DOI : 10.1007/s12686-014-0363-9

Éditeur(s) : HAL CCSD Taylor & Francis: SSH Journals
Résumé : International audience
We investigated the oxygen-conserving potential of the human diving response by comparing trained breath-hold divers (BHDs) to non-divers (NDs) during simulated dynamic breath-holding (BH). Changes in haemodynamics [heart rate (HR), stroke volume (SV), cardiac output (CO)] and peripheral muscle oxygenation [oxyhaemoglobin ([HbO2]), deoxyhaemoglobin ([HHb]), total haemoglobin ([tHb]), tissue saturation index (TSI)] and peripheral oxygen saturation (SpO2) were continuously recorded during simulated dynamic BH. BHDs showed a breaking point in HR kinetics at mid-BH immediately preceding a more pronounced drop in HR (−0.86 bpm.%−1) while HR kinetics in NDs steadily decreased throughout BH (−0.47 bpm.%−1). By contrast, SV remained unchanged during BH in both groups (all P > 0.05). Near-infrared spectroscopy (NIRS) results (mean ± SD) expressed as percentage changes from the initial values showed a lower [HHb] increase for BHDs than for NDs at the cessation of BH (+24.0 ± 10.1 vs. +39.2 ± 9.6%, respectively; P < 0.05). As a result, BHDs showed a [tHb] drop that NDs did not at the end of BH (−7.3 ± 3.2 vs. −3.0 ± 4.7%, respectively; P < 0.05). The most striking finding of the present study was that BHDs presented an increase in oxygen-conserving efficiency due to substantial shifts in both cardiac and peripheral haemodynamics during simulated BH. In addition, the kinetic-based approach we used provides further credence to the concept of an “oxygen-conserving breaking point” in the human diving response.
ISSN: 0264-0414

hal-01325466
https://hal-univ-perp.archives-ouvertes.fr/hal-01325466
DOI : 10.1080/02640414.2016.1183809

Éditeur(s) : HAL CCSD
Résumé : International audience
Many countries are legally obliged to embrace ecosystem-based approaches to fisheries management. Reductions in bycatch and physical habitat damage are now commonplace, but mitigating more sophisticated impacts associated with the ecological functions of target fisheries species are in their infancy. Here we model the impacts of a parrotfish fishery on the future state and resilience of Caribbean coral reefs, enabling us to view the tradeoff between harvest and ecosystem health. We find that the implementation of a simple and enforceable size restriction of >30 cm provides a win:win outcome in the short term, delivering both ecological and fisheries benefits and leading to increased yield and greater coral recovery rate for a given harvest rate. However, maintaining resilient coral reefs even until 2030 requires the addition of harvest limitations (<10% of virgin fishable biomass) to cope with a changing climate and induced coral disturbances, even in reefs that are relatively healthy today. Managing parrotfish is not a panacea for protecting coral reefs but can play a role in sustaining the health of reefs and high-quality habitat for reef fisheries.
http://hal.univ-reunion.fr/hal-01369752

hal-01369752
http://hal.univ-reunion.fr/hal-01369752
DOI : 10.1073/pnas.1601529113

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Despite the importance of invertebrate resources for Pacific coral reef islands, few studies have specifically addressed the effects of harvesting on invertebrate assemblages including targeted and non-targeted species. The impacts of recreational harvesting on reef and seagrass invertebrate assemblages in New Caledonia (South Pacific) are investigated by comparing communities in non-MPA and MPA areas. Sampling was done using a standard core method on seagrasses and by visual survey along belt transects on reefs. A total of 371 species were recorded, 174 on seagrasses and 254 on reefs, with 57 common species. Reef and seagrass invertebrate communities were very different in MPA and non-MPA areas. On both habitats, MPAs were identified as undisturbed areas while non-MPAs were defined as moderately disturbed with a predominance of small-sized and opportunistic species. Fishing not only affects target species but also non-target species through secondary effects. These results highlight the necessity of a community based approach for the conservation of resources in tropical poorly known environments.
ISSN: 0165-7836

hal-01311486
http://hal.univ-reunion.fr/hal-01311486
http://hal.univ-reunion.fr/hal-01311486/document
http://hal.univ-reunion.fr/hal-01311486/file/Harvesting%20effects%20on%20tropical%20invertebrate%20assemblages%20in%20New_hal.pdf
DOI : 10.1016/j.fishres.2015.02.001