Éditeur(s) : HAL CCSD
Résumé : The mangroves play a vital role in the ecological balance. They provide marine ecosystem resources and are involved in its stabilization and in the coastal protection. They constitute the growth areas of many species that feed marine species and particularly shrimp. We develop a standard fishery model by integrating mangroves area into the analysis. The extended model shows that mangrove plays animportant role in shrimp production and data related to it are well supported by the model. We analyze the e¤ects of mangrove on open access of the French Guiana shrimp fishery and show that mangrove is not the only factor that plays a vital role in the French Guiana shrimp fishery.
https://hal.univ-antilles.fr/hal-01383024

hal-01383024
https://hal.univ-antilles.fr/hal-01383024
https://hal.univ-antilles.fr/hal-01383024v2/document
https://hal.univ-antilles.fr/hal-01383024/file/Diop%20et%20al.%20%282016%29.pdf

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Bimini, the closest Bahamian island to the United States, is made up of two main islands, North Bimini and South Bimini, and several cays. This image features a view of shallow waters near an island with mangroves. In the distance is a seaplane flying and several dwellings. Slide labeled Bimini Mar '46.
Bahamas -- North America -- Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 7:12
http://ufdc.ufl.edu/AA00028537/00001

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Boats anchored near a dock on Great Whale Cay. In the distance are mangroves. Great Whale Cay, in the Berry Island chain of the Bahamas, was the home of Marion Barbara “Joe” Carstairs. Carstairs was an openly gay, British world champion speedboat racer in the 1920's who bought the island in 1934. Slide labeled Carstair's Isle, Mar. '46.
Bahamas -- North America -- Great Whale Cay, Berry Islands

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:15
http://ufdc.ufl.edu/AA00028377/00001

Éditeur(s) : HAL CCSD Oldendorf/Luhe
Résumé : International audience
Large filamentous sulfur-oxidizing bacteria belonging to the Beggiatoacae family can cover large portions of shallow marine sediments surrounding mangroves in Guadeloupe (French West Indies). In order to assess the importance of Beggiatoa mats as an infaunal food source, observations were conducted of the area within mats and at increasing distances from mats. We used natural isotopic compositions and a C-13 enrichment study. Both revealed an ingestion of bacterial mats by associated meiofauna, dominated by rotifers and to a smaller extent by small polychaetes and nematodes. Compared to adjacent sites, sediment covered by bacterial mats presented a higher abundance of diatoms, whereas the total biomass of bacteria did not vary. This constant bacterial abundance suggests that the proportion of organic matter represented by sulfur bacteria is limited compared to the fraction of total bacteria. There was no significant difference in infaunal abundance in mats, suggesting that the availability of this chemosynthetic food resource had a limited local effect. Grazers presented a delta C-13 value increasing with distance from the mat. However, isotopic composition of phospholipid-derived fatty acids specific for diatoms and bacteria revealed that this change is related to modifications of delta C-13 dietary components rather than to changes in diet composition. These complementary methods revealed that the occurrence of sulfur-oxidizing bacterial mats does not necessarily affect grazer abundance and importance of bacteria in their diet. Despite its wide occurrence, Beggiatoa mats would consequently have a minor influence on the structure of the mangrove food web.
ISSN: 0171-8630

hal-01545912
https://hal.archives-ouvertes.fr/hal-01545912
DOI : 10.3354/meps11035

Éditeur(s) : HAL CCSD
Résumé : International audience
The functioning of the Manche-à-Eau lagoon and of its mangrove environment with the population of marine fish of Guadeloupe has been studied since 1983, and particularly in the 2000s. This ecosystem supports a stable fish assemblage structure because of its twice a day turnover (14.8%) of marine water. It is a favorable and important site for the reproduction (38%) and growth (46%) of a large number of species. The life cycle of these fish species share, for the most part, an ecophase in the mangrove in brackish water and a marine ecophase outside the lagoon. The mangrove plays a vital role in the retention of continental nutrients. This facilitates the trophic exploitation of vegetal and animal detritus bases by the fish in high population density. The majority of populations present individuals reaching length at least 40% from the known maximum length for the species, although only 38.1% have individuals longer than 300 mm. The mangrove aids in the spawning activity of fish species (41% to 58% of the total abundance) and in the reproductive (maturation, migration) process (58% in density and 70% in biomass). The sedentary species lay their eggs in the mangrove, whereas the temporary species stay there during their trophic ecophase or after a genesic migration from the sea to assure sexual maturation for both sexes in the species.
Proceedings of the 61st Gulf and Caribbean Fisheries Institute
Gosier, Guadeloupe

hal-00755780
https://hal.univ-antilles.fr/hal-00755780
https://hal.univ-antilles.fr/hal-00755780/document
https://hal.univ-antilles.fr/hal-00755780/file/GCFI_61_2009_307-312.pdf

Éditeur(s) : HAL CCSD Wiley-Blackwell
Résumé : International audience
In this multidisciplinary study, we combined morphological, physiological, and phylogenetic approaches to identify three dominant water bloom-forming Cyanobacteria in a tropical marine mangrove in Guadeloupe (French West Indies). Phylogenetic analysis based on 16S rRNA gene sequences place these marine Cyanobacteria in the genera Oscillatoria (Oscillatoria sp. clone gwada, strain OG) or Planktothricoides (Candidatus Planktothricoides niger' strain OB and Candidatus Planktothricoides rosea' strain OP; both provisionally novel species within the genus Planktothricoides). Bioassays showed that Candidatus Planktothricoides niger' and Candidatus Planktothricoides rosea' are toxin-producing organisms. This is the first report of the characterization of Cyanobacteria colonizing periphyton mats of a tropical marine mangrove. We describe two novel benthic marine species and provide new insight into Oscillatoriaceae and their potential role in marine sulfide-rich environments such as mangroves.
ISSN: 0378-1097

hal-01536679
https://hal.archives-ouvertes.fr/hal-01536679
DOI : 10.1111/1574-6968.12551

Résumé : Les mattes de procaryotes constituent une niche écologique diversifiée. peu étudié!<..en mangrove et jamais décrjte dans les Antilles. L'objectif de cette thèse est de décrire les procaryotes filamenteux reposant sur le sédiment marin et de caractériser les interactions entre la matte, milieu et entre les différents micro-organismes. Nous avons d'abord caractérisé les micro-organismes majoritaires de la matte par le séquençage de l'ADNr 16S et des hybridations moléculaires (FISH). Il a ainsi été possible de décrire deux nouvelles espèces de Beggiatoaceae dont la structure a été étudiée par microscopie électronique. De plus, afin de caractériser l'environnement chimique de ces bactéries, des capteurs potentiométriques ont été utilisés. Ils ont permis de démontrer que les Beggiaotaceae oxydaient les sulfures en prélevant l'oxygène du milieu, tandis que des analyses de microscopie couplées à de l'EDX ont mis en évidence des réserves de soufre intracellulaires dans ces bactéries. Le séquençage de l'ADNr 16S des cyanobactéries filamenteuses a mis en évidence quatre nouvelles espèces de l'ord~e des Oscillatoriales. Deux d'entre elles, du genre Planktothricoides ont révélé une toxicité positive sur les Artemia sp:, les deux autres ont été identifiées comme proches d'Oscillatoria spongeliae, une espèce symbiotique d'éponge, bien que les coupes uItrafines d'une de ces souches aient montré une morphologie interne proche des Tychonema. L'analyse des données a permis d'étoffer les connaissances sur les communautés microbiennes de mangrove et constitue une base intéressante de travail sur la contribution des micro-organismes au fonctionnement de l'écosystème mangrove dans son ensemble
Procaryotic mats are ecological niches, occuring in many ecosystems. Those structures are little studied in marine mangrove sediment and have never been described in West Indies. The purpose ofthis thesis is to characterize the interactions between the mat and the environment, and between the different filamentous micro-organisms living into the mat. In a first place, we characterized the mainly micro-organisrns of the mat by sequencing 16S rDNA. We confirmed these sequences by molecular hybridization (FISH) with specific probes designed from sequences obtained. Thus, it was possible to describe two new Beggiatoaceae strains, whose structure has been studied by electronic microscopy. Furthemore, we used potentiometric captors in situ and in laboratory, by creating a mesocosm, in order to define the chemical environment where involved these bacteria. These experiences proved that the Beggiatoaceae of the mat oxidized the sulfur taking the oxygen from the medium, while the microscopic analysis coupled with EDX showed intracellular sulfur granules into the bacteria. The study of the filamentous cyanobacteria of the mat highlighted four new cyanobacteria strains, all studied by electronic rmcroscopy. Two of them belongs to Planktothrlcoides genus and showed positive toxicity on Artemia salina. The others species are close to Oscillatorla spongeliae, a sponge symbiont, nevertheless, one ofthem showed an intemal morphology close to Tychonema. The analysis of the different results adduces sorne knowledge about mangrove microbial communities. Furthermore, this study can be used as an interesting base to study the micro-organisms contribution in functioning mangrove ecosystem

http://www.theses.fr/2013AGUY0614/document

Éditeur(s) : Université des Antilles Études caribéennes
Résumé : La Martinique possède 55 km2 de récifs coralliens, 50 d’herbiers et 20 de mangroves. Ces trois écosystèmes produisent des biens et services dont la valeur est estimée à quelque 250 millions d’euros par an. Près de 60 % de cette valeur est issue des usages directs liés aux activités récréatives (plongée, excursion, récréation balnéaire) induites pour l’essentiel par le tourisme et celles liées à la pêche (professionnelle et de plaisancière). Les services écosystémiques (assimilés aux usages indirects) tels que la protection des côtes, l’absorption/séquestration de carbone, la production de biomasse de poissons et l’épuration de l’eau sont conséquents puisque leur valeur annuelle s’élève à 94 millions € soit 38 % de la valeur totale. La valeur de ce qui a trait au non-usage des récifs, herbiers et mangroves (lié à la volonté de transmettre un patrimoine écologique pour l’essentiel ou encore à la satisfaction de savoir que les récifs sont en bon état) se traduit par une création de valeur de l’ordre de 10 millions €/an. Les herbiers et les mangroves contribuent le plus (par km2) à la création de valeur (respectivement 2,16 millions €/km2, 1,87 million €/km2 contre 1,78 million €/km2 pour les récifs). Ils doivent donc bénéficier de mesures de protection et surtout de valorisation au même titre que les récifs coralliens qui font déjà l’objet d’une attention particulière.
Martinique possesses 55 km2 of coral reefs, 50 of sea grass and 20 of mangroves. These three ecosystems produce services for a value estimated at 250 millions € per year. About 60% of this value originates from directs uses such as recreational activities (diving, excursions, beach activities, etc.) induce by tourism and fishery. Ecosystem services (indirect uses) such as coastal protection, carbon sequestration, biomass production and water purification are significant since their sum value reaches annually 94 millions € (38% of the total economic value). Non-use value links to the improvement of the health of coastal ecosystem is estimated to 10 millions € per year. At the ecosystem level, sea grass and mangrove contribute the more (per km2) to the wealth creation (respectively 2,16 millions €/km2, 1,87 million €/km2 against 1,78 million €/km2 for the reefs). They need therefore to benefit from protection and management measures in the same magnitude than the reefs already received.
Martinique

Droits : info:eu-repo/semantics/openAccess
urn:doi:10.4000/etudescaribeennes.4410
http://journals.openedition.org/etudescaribeennes/4410

Éditeur(s) : Université des Antilles Études caribéennes
Résumé : Cette étude permet une approche distincte de la réflexion sur les ressources marines dans le cadre d’une aire protégée. En effet, les écosystèmes marins sont essentiels d’autant plus, qu’ils présentent en Nouvelle-Calédonie une grande richesse, notamment en termes de patrimoine culturel. Ce sont majoritairement les Kanak qui habitent sur la Côte Est de la Province nord, où la Collectivité et le WWF collaborent à la mise en place de plusieurs aires marines protégées (AMP). Jusqu’à présent, la gestion coutumière Kanak a permis une relative préservation de ces écosystèmes dans un secteur littoral non soumis aux pressions de l’urbanisation, du tourisme ou de la navigation. L’étude s’attache à souligner les enjeux autour de la mise en place des AMP et des perspectives de développement local, sur le milieu marin et les populations locales. Il s’agit de voir comment cette expérimentation est envisagée par les différents acteurs (État, Province Nord, associations, coutumiers, etc.) et de s’interroger sur les mécanismes de gouvernance.
This study allows a distinct approach to thinking about the marine resources in a protected area. Indeed, marine ecosystems are essential, especially as they are in New Caledonia, particularly in terms of cultural heritage. It is mainly Kanak who live on the East Coast of the North Province, where the Community and WWF collaborate on the installation of several marine protected areas (MPAs). So far, the Kanak customary management allowed a relative preservation of these ecosystems in a coastal area not subject to the pressures of urbanization, tourism and navigation. The study aims to highlight the issues surrounding the establishment of MPAs and opportunities for local development on the marine environment and local populations. This is to see how this experiment is considered by the various actors (State, Northern Province, associations, etc. customary). And to consider the mechanisms of governance.
Nouvelle-Calédonie

Droits : info:eu-repo/semantics/openAccess
urn:doi:10.4000/etudescaribeennes.7883
http://journals.openedition.org/etudescaribeennes/7883

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Wood debris are an important component of mangrove marine environments. Current knowledge of the ecological role of wood falls is limited by the absence of information on metazoan colonization processes over time. The aim of this study was to provide insights to their temporal dynamics of wood eukaryotic colonization from a shallow water experiment in a mangrove swamp. Combined in situ chemical monitoring and biological surveys revealed that the succession of colonizers in the mangrove swamp relates with the rapid evolution of sulfide concentration on the wood surface. Sulfide-tolerant species are among the first colonizers and dominate over several weeks when the sulfide content is at its maximum, followed by less tolerant opportunistic species when sulfide decreases. This study supports the idea that woody debris can sustain chemosynthetic symbioses over short time-scale in tropical shallow waters.
ISSN: 0141-1136

hal-01545913
https://hal.archives-ouvertes.fr/hal-01545913
DOI : 10.1016/j.marenvres.2013.03.007

Éditeur(s) : HAL CCSD Public Library of Science
Résumé : International audience
Beggiatoaceae, giant sulphur-oxidizing bacteria, are well known to occur in cold and temperatewaters, as well as hydrothermal vents, where they form dense mats on the floor.However, they have never been described in tropical marine mangroves. Here, we describetwo new species of benthic Beggiatoaceae colonizing a marine mangrove adjacent to mangroveroots. We combined phylogenetic and lipid analysis with electron microscopy in orderto describe these organisms. Furthermore, oxygen and sulphide measurements in and exsitu were performed in a mesocosm to characterize their environment. Based on this, two new species, Candidatus Maribeggiatoa sp. and Candidatus Isobeggiatoa sp. inhabiting tropical marine mangroves in Guadeloupe were identified. The species identified as CandidatusMaribeggiatoa group suggests that this genus could harbour a third cluster with organisms ranging from 60 to 120 μm in diameter. This is also the first description of an Isobeggiatoa species outside of Arctic and temperate waters. The multiphasic approach also gives information about the environment and indications for the metabolism of these bacteria. Our study shows the widespread occurrence of members of Beggiatoaceae family and provides new insight in their potential role in shallow-water marine sulphide-rich environments such as mangroves.
ISSN: 1932-6203

hal-01205641
https://hal.univ-antilles.fr/hal-01205641
https://hal.univ-antilles.fr/hal-01205641/document
https://hal.univ-antilles.fr/hal-01205641/file/Beggiatoa%20Plosone2015.pdf
DOI : 10.1371/journal.pone.0117832

Éditeur(s) : Université des Antilles Études caribéennes
Résumé : Les ressources marines constituent une richesse économique d’une grande importance pour un grand nombre de pays de la planète. Du fait de l’action de l’homme, ces ressources subissent une fragilisation et une raréfaction dues entre autres à la pollution, à la surpêche, à l’urbanisation intensive... S’ajoute à cette liste, depuis quelques années, le réchauffement de la planète qui affecte d’une manière sensible la diversité biologique marine. Pourtant les réponses internationales face à cette dégradation, au-delà du fait qu’elles sont timides, sont rares. Il faudra dès lors se rabattre sur les solutions de lutte globale contre le réchauffement de la planète entreprise par la communauté internationale afin de contrer cette dégradation.
Marine resources are a wealth of great economic importance for many countries in the world. Due to the action of man, these resources undergo embrittlement and rarification among others to pollution, overfishing, urbanization, intensive ... Added to this list in recent years, the global warming that affects a significantly marine biodiversity. Yet the international response to this degradation, beyond the fact that they are shy, is rare. It will therefore fall back on solutions to the global fight against global warming taken by the international community to counter this degradation.
Danemark
Mexique

Droits : info:eu-repo/semantics/openAccess
urn:doi:10.4000/etudescaribeennes.4421
http://journals.openedition.org/etudescaribeennes/4421

Éditeur(s) : HAL CCSD Université des Antilles
Résumé : International audience
In this study, we propose to analyze the limits of mass tourism in the French Antilles, specifically the decline of tourism, economic limits, and ecological degradation). The recognition of these limits is overdue, and signals a need to define another model for tourism development.The popular coastal sector in the south of Martinique has been subject new regulations to protect marine resources. These regulations require the development of new practices and a greater level of awareness for tourists, for example, around coral reefs and mangroves. Ecotourism programs aim to demonstrate to visitors the forests rich natural resources and biodiversity in general. It also features the inclusion of small rural businesses that benefit from additional sources of revenue as a result of ecotourism.The situation in the French Antilles is complex: Urbanization is fraught with serious consequences for the coastline. Tourism products currently being marketed on the island are not competitive (particularly against the political dynamics of the neighbouring island of Dominica). Ecotourism and sustainable tourism are just beginning to develop in such destinations, where tourism has been declining in the last ten years. The situation of the French Antilles is paradoxical in a region that generally has a very favourable tourism. Assessing these limits through the scope of ecotourism helps to highlight the causes of these difficulties and to adapting to new tourism practices.
En el contexto de este estudio, nos proponemos analizar los límites del turismo de masas en las Antillas Francesas (depreciación del turismo, las limitaciones económicas, ecológicas y las molestias). Este reconocimiento de esos límites está en el origen de la conciencia tardía de la necesidad de definir otro modelo de desarrollo turístico.En el sector costero de la más popular, como en el sur de Martinica, se pone en la normativa nuevo lugar para proteger los recursos marinos. Esto requiere el desarrollo de nuevas prácticas y la sensibilización de los turistas, por ejemplo, alrededor de los arrecifes de coral y los manglares.Programas en torno al ecoturismo también tienen como objetivo dar al visitante la riqueza de los recursos forestales y la biodiversidad en general. También incluye las pequeñas empresas rurales que reciben los nuevos ingresos a través del turismo.Pero la situación es compleja en las Antillas francesas: la urbanización está llena de importantes consecuencias para la costa. Productos turísticos que se comercializan actualmente no son competitivos (en particular, contra la dinámica política de la cercana isla de Dominica). Ecoturismo y desarrollo sostenible están empezando a desarrollar en este destino turístico, donde el turismo está en problemas en los últimos diez años.Esta situación es bastante paradójico en un turismo regional muy favorable. Sin lugar a dudas, pensando en el ecoturismo contribuye a identificar los destinos de estos retrasos y dificultades para adaptarse a nuevas prácticas de turismo.
Dans le cadre de cette étude, l’accent est mis sur les limites du tourisme de masse dans les Antilles françaises (dépréciation du tourisme, les contraintes économiques et les nuisances écologiques). La reconnaissance de ces limites est à l'origine de la prise de conscience tardive de la nécessité de définir un autre modèle de développement touristique.Dans le sud de la Martinique, le secteur le plus populaire du littoral, de nouvelles règlementations sont mises en place pour protéger les ressources marines. Cela nécessite le développement de nouvelles pratiques et de sensibilisation des touristes notamment autour des récifs coralliens et les mangroves. Les programmes autour de l'écotourisme visent également à montrer aux visiteurs la richesse des ressources forestières et de la biodiversité en général. Il comprend également les petites entreprises rurales qui reçoivent de nouveaux revenus grâce au tourisme.La situation est complexe dans les Antilles françaises: l'urbanisation est lourde de conséquences importantes sur la côte. Les produits touristiques commercialisés actuellement ne sont pas compétitifs (notamment contre la dynamique politique de l'île voisine de la Dominique). L'écotourisme et le tourisme durable commencent tout juste à se développer dans ces destinations où le tourisme classique est en difficulté depuis une dizaine d’années ; situation assez paradoxale au regard du dynamisme de ce secteur d’activité dans la région.
ISSN: 1779-0980

hal-01624756
https://hal.archives-ouvertes.fr/hal-01624756
DOI : 10.4000/etudescaribeennes.5262

Éditeur(s) : Gauthier-Villars
Résumé : The mangroves of Senegal are limited to the inlet of the Casamance - a river with very low discharge - and to the Sine-Saloum. The mineralogical and geochemical analysis of sediments (derived from 30 deep bore-holes) shows the thickness of the mangrove substrate, which overlies the continental terminal formation. Kaolinite and smectite account for over 90% of the clay fraction. The former is derived from the continental terminal whereas the latter is of marine origin. The chemical composition of the mangrove sediments is remarkably stable and clays play an overwhelming role in the preservation of organic matter and pyrite. Since 1968, a drought in Senegal has caused an important increase in the salinity levels of streams and water-tables; a considerable modification of vegetation zones in the Casamance, especially manifest in the extension of bare flats locally known as "tannes" at the expense of mangroves and marked changes in the morphology and geochemistry of mangrove soils. Compared to most mangrove areas in the humid tropics, mangroves in Senegal are characterized by a very fragile equilibrium.
Oceanologica Acta, Special issue (0399-1784) (Gauthier-Villars), 1982

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/00246/35744/34252.pdf
http://archimer.ifremer.fr/doc/00246/35744/

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The biogeochemistry of sulfur and carbon during early-diagenetic processes within organic-rich marine mangrove sediments was studied in the “Manche à Eau” lagoon, Guadeloupe, West Indies. These sediments are characterized by a total organic carbon content (TOC) mostly above 11 wt%, δ13CTOC below − 25‰ VPDB and C/Nmolar ratios exceeding 15. Rates of mangrove-derived organic carbon accumulation vary between ~ 200 and 400 gOC·m− 2·yr− 1, with highest rates at the shore of the lagoon. On the lagoon border, where colorless filamentous sulfur-oxidizing bacteria colonize the sediments, active sulfate reduction within the upper 20 cm, with a net removal rate of ~ 0.5 μmol·cm− 3·d− 1, is assumed to be essentially driven by organic carbon oxidation. This is expressed by relatively low apparent sulfur isotope fractionation (34εnet = − 33‰) and a gentle δ18O/δ34Ssulfate apparent slope of 0.36 ± 0.03 (2s). Further inside the lagoon, in the absence of sulfur-oxidizing bacteria, higher apparent sulfur isotope fractionation and a steeper δ18O/δ34Ssulfate slope (0.67 ± 0.20) suggest an overall lower sulfate removal rate that may be coupled to minor sulfur disproportionation. Spatial and vertical variation in sulfur cycling, reflected by oxygen and sulfur isotopic characteristics, seem to be mainly controlled by unsteady to relatively steady organic matter deposition and its reactivity. In all sediments, δ34S values of pyrite are positively correlated with the TOC/TS ratio and negatively correlated with δ13CTOC; suggesting a primary control of the quantity and quality of organic matter on the pyrite isotope records, despite potential iron-limiting conditions for the most active sites. Our results provide insights into the role of organic carbon input on sulfur cycling; stimulating sulfate reduction and in turn the presence of sulfur-oxidizing microbial mats, resulting in an intense cycling of both carbon and sulfur in these marine mangrove sediments.
ISSN: 0009-2541

hal-01507696
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01507696
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01507696/document
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01507696/file/Cr%C3%A9mi%C3%A8re%20et%20al.%20-%20Sulfur%20diagenesis%20under%20rapid%20accumulation%20of%20orga.pdf
DOI : 10.1016/j.chemgeo.2017.02.017

Éditeur(s) : Université des Antilles Études caribéennes
Résumé : It is increasingly recognized that maintaining biodiversity is of fundamental importance toward sustaining human livelihoods. One of the major assets of the region identified as “Latin America and the Caribbean” (LAC) is its biological wealth; by extension, the continued biodiversity loss of the LAC region is seen as one of the world’s principal environmental problems. The marine resources of Caribbean Sea are of vital economic, ecological and social importance to the LAC region, and are under particular threat. Marine turtles play vital roles throughout the Caribbean Sea both in terms of ecological functions and human welfare. Conservation efforts in this direction can often depend on the ability to place a value on welfare changes associated with the loss of ecosystem goods and services into which biodiversity plays an integral role.Using the ecosystem service categories of the Millennium Ecosystem Assessment, this paper discusses from an inter-disciplinary perspective the methodologies associated with linking marine turtles, ecosystem services and human welfare. While the main economic benefit to be currently valued may stem from the eco-tourism potential surrounding turtle nesting sites, for a true picture of the environmental resources upon which this service depends, it is necessary to also identify the other provisioning, regulating and cultural services of the resource. In this way, human welfare impacts can be more truly judged, and effective resource management can be undertaken.
La préservation de la biodiversité est d'une importance fondamentale pour le maintien des moyens de subsistance de l'homme. L'un des atouts majeurs de l’ensemble régional que constitue l'Amérique latine et les Caraïbes (LAC) demeure sa richesse biologique, par extension, toute dégradation de sa biodiversité pose des problèmes environnementaux d’ordre mondial. Les ressources marines de la mer des Caraïbes, qui sont particulièrement menacées, sont d'une importance économique, écologique et sociale vitale pour la région. Les tortues marines jouent un rôle essentiel dans la mer des Caraïbes à la fois en termes de fonctions écologiques et de bien-être humain.En ce sens, les efforts de conservation peuvent de la capacité de chiffrer la valeur sur le bien-être des changements associés à la perte de biens et de services des écosystèmes dans lesquels la biodiversité est partie intégrante. En utilisant les catégories de services des écosystèmes du Millennium Ecosystem Assessment, la présente étude aborde, dans une perspective interdisciplinaire, les méthodologies associées aux interrelations entre les tortues marines, les services écosystémiques et le bien-être de l'homme.Si le principal avantage économique actuellement identifié repose sur le potentiel écotouristique, autour des sites de nidification des tortues, pour une image fidèle des ressources environnementales sur lesquelles ce service repose, il est nécessaire d'identifier également les autres apports de la ressource, en termes de régulations, de services culturels. De cette façon, les impacts sur le bien-être humain peuvent être mieux appréhendés et les ressources peuvent être gérées de façon plus efficace.
Caraïbes

Droits : info:eu-repo/semantics/openAccess
urn:doi:10.4000/etudescaribeennes.10990
http://journals.openedition.org/etudescaribeennes/10990

Éditeur(s) : HAL CCSD Springer Verlag
Résumé : International audience
Purpose: Marine mangrove sediments in the Manche-à-Eau lagoon (Guadeloupe, Caribbean Sea) harbor locally extensive, white microbial mats. These mats cover the surface of reduced sediments near the roots of red mangrove trees, Rhizophora mangle, and are mainly composed of sulfur-oxidizing bacteria belonging to the Beggiatoaceae family, with some filamentous cyanobacteria. The goal of this study was to investigatethe possible influence of sediment characteristics on the presence of these microbial mats. Materials and methods: Four push cores were collected in April 2013, two from zones with microbial mats and two from zones without mats. Sediment characteristics (grain-size distribution, mineralogy, total organic carbon (TOC) and total nitrogen (TN) contents, atomic TOC/TN ratios, and organic matter (OM) δ13C values) were compared for all four cores.Results and discussion: Significant differences were observed between sediments below microbial mats and those without mats. Sediments with microbial mats contained greater amounts of clay, and higher TOC, TN, and TOC/TN ratios, with lower total carbonate content andδ13C values. The higher clay content most likely results from lower fluid flow velocity near to mangrove roots, while higher TOC/TN ratiosand lower δ13C values indicate higher inputs of OM from mangrove trees. These results are consistent with the fact that microbial mats were observed near the roots of mangrove trees, which trap OM from terrestrial vegetation and fine sediments.Conclusions: The grain-size distribution of sediment particles, the total carbonate content, and the δ13C values are the main parameters discriminating between zones with microbial mats and those without mats. Variations in total carbonate content, which is mainly of biogenic origin, result from conditions that are more favorable for benthic organisms in zones without microbial mats. Variations of the TOC/TN ratios are controlled by the presence of a non-negligible amount of inorganic nitrogen bound to surface clay mineral particles and/or by microbial processes.
ISSN: 1439-0108

hal-01682110
https://hal.univ-antilles.fr/hal-01682110
DOI : 10.1007/s11368-016-1555-6

Éditeur(s) : Université des Antilles Études caribéennes
Résumé : Dans le cadre de cet article introductif au dossier thématique sur les ressources marines, les auteurs rappellent les enjeux liés aux usages et types de consommation, à leurs modalités de protection et systèmes de gouvernance. Ils rappellent leur importance environnementale, sociale, mais aussi économique pour bon nombre de pays et de communautés côtières. Ils mettent l’accent sur les actions déjà mises en œuvre et sur la nécessité d’approfondir les connaissances dans ce domaine.
In this introductory article of the issue paper on marine resources, the authors review the issues with usage and consumption patterns, in terms of protection and governance systems. They stress their environmental significance, social but also economic for many country and coastal communities. They focus on the actions already implemented and the need to deepen knowledge in this field.
Caraïbes

Droits : info:eu-repo/semantics/openAccess
urn:doi:10.4000/etudescaribeennes.4475
http://journals.openedition.org/etudescaribeennes/4475

Éditeur(s) : HAL CCSD Station Biologique
Résumé : International audience
From fish samplings (rotenone: 6 February 2002 & 13 May 2003; boxtraps: January 2008 to July 2009) in amangrove lagoon, the demographic structure, reproductive period and diet of Lophogobius cyprinoides were studied.Individual fish were measured (< 1 mm), weighed (± 0.01 g), and sexed by observing the urogenital papilla, sex-ratios andtotal length (TL)-standard length and length-mass relationships were calculated. Five individuals per size class (2 mm) wereused to study sexual maturity by macroscopic observation of gonad structure with a sexual maturity scale, and diet byqualitative and quantitative examination of digestive tract contents and calculation of the following indices: levels offullness and vacuity; occurrence, number, and point frequencies of various food items, and quality of nutrition. Growth isisometric and sexual dimorphism in favor of males (78 vs. 64 mm), demographic structure (18 ≤ TL ≤ 78 mm) and conditionevolved over time, with a distinct femininization of the population. Sexual inversion appeared from 46 mm onward, andtotal masculinization at 72 mm. Protogynous hermaphrodism is advantageous in a sedentary, subcryptobenthic species thatis reproductively active almost throughout the year. The species has an omnivorous diet specialized in copepods and plants
ISSN: 0007-9723

hal-00746079
https://hal.univ-antilles.fr/hal-00746079

Éditeur(s) : Université des Antilles Études caribéennes
Résumé : Le milieu marin de la Mer des Caraïbes est composé de trois écosystèmes principaux : les récifs coralliens, les mangroves et les herbiers, qui abritent une faune et une flore exceptionnelles. Mais l’équilibre fragile de ces espaces est menacé par les nombreuses activités humaines qui les dégradent progressivement. Face aux enjeux socio-économiques qu’ils représentent pour les pays caribéens, ces derniers ont établi un cadre juridique à l’échelle régionale pour la protection et la gestion de leur ressource marine, la Convention de Carthagène. Après avoir dressé un tableau de la situation environnementale des principaux écosystèmes marins caribéens, il convient de faire un point sur les modes de gestion mis en œuvre pour les préserver.
The marine environment of the Caribbean Sea is composed primarily of three main ecosystems: coral reefs, mangroves and seagrasses, home to fauna and flora. But the delicate balance of these areas is threatened by many human activities that deteriorate gradually deteriorated them. Deal with socio-economic issues around these resources, Caribbean countries have established a legal framework at the regional level to ensure the protection and management of marine resources (the Cartagena Convention). After drawing up an overview of the environmental situation of the main Caribbean marine ecosystems, it should present the management mode adopted to preserve them.
Caraïbes

Droits : info:eu-repo/semantics/openAccess
urn:doi:10.4000/etudescaribeennes.4343
http://journals.openedition.org/etudescaribeennes/4343