Descrição
This data set was obtained following the missions carried out in April 2013 and April 2014 and responds to the agreements No. 2012/149/DEAL/SEPR as well as the project funded by the Ministry of Overseas Territories (Grant award order No. 12-024015-D).
The aim of the work was to carry out an inventory of the fish species present in several mangroves of Mayotte.
The April 2013 mission took place from April 15 to 24, 2013, and comprised eight days of fieldwork during which four sites were sampled multiple times: Dembéni, Malamani, Tsingoni, and Tsoundzou. The April 2014 mission took place from March 26 to April 15, 2014. It comprised nine days of fieldwork during which nine sites were sampled: Tsoundzou 1, Dembéni, Hajangoua, Bandrélé, Dapani, M’zouazia, Malamani, Chiconi, and Tsingoni.
Registros de Dados
Os dados deste recurso de evento de amostragem foram publicados como um Darwin Core Archive (DwC-A), que é o formato padronizado para compartilhamento de dados de biodiversidade como um conjunto de uma ou mais tabelas de dados. A tabela de dados do núcleo contém 77 registros.
Também existem 3 tabelas de dados de extensão. Um registro de extensão fornece informações adicionais sobre um registro do núcleo. O número de registros em cada tabela de dados de extensão é ilustrado abaixo.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
Versões
A tabela abaixo mostra apenas versões de recursos que são publicamente acessíveis.
Como citar
Pesquisadores deveriam citar esta obra da seguinte maneira:
Ponton D, Béarez P, Pruvost P, Durand J-D (2026). Fish inventories in the mangroves of Mayotte: missions of 2013 and 2014
Direitos
Pesquisadores devem respeitar a seguinte declaração de direitos:
This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
GBIF Registration
Este recurso foi registrado no GBIF e atribuído ao seguinte GBIF UUID: 21558678-efca-4c87-a59e-b6924d11af43. IRD - Institute of Research for Development publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por GBIF France.
Palavras-chave
Samplingevent; occurrence; checklist; specimen; observation
Contatos
- Provedor Dos Metadados ●
- Originador ●
- Ponto De Contato
- IRD emeritus research director
https://orcid.org/0000-0003-2313-2543
- Provedor De Conteúdo
Cobertura Geográfica
Mangroves of Bandrélé, Chiconi, Dapani, Dembéni, Hajangoua, Malamani, M’zouazia, Tsingoni, and Tsoundzou 1.
| Coordenadas delimitadoras | Sul Oeste [-12,977, 45,1], Norte Leste [-12,795, 45,206] |
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Cobertura Taxonômica
N/A
| Reino | Animalia |
|---|---|
| Filo | Chordata |
| Class | Osteichthyes |
| Ordem | Gobiiformes, Elopiformes, Kurtiformes, Syngnathiformes, Beloniformes, Blenniiformes, Perciformes, Tetraodontiformes, Spariformes, Gobiiformes, Acanthuriformes, Carangiformes, Mugiliformes, Anguilliformes, Atheriniformes, Aulopiformes, Pleuronectiformes, Clupeiformes, Ovalentaria, Gonorynchiformes |
| Família | Sciaenidae, Haemulidae, Synodontidae, Eleotridae, Oxudercidae, Mugilidae, Terapontidae, Megalopidae, Sphyraenidae, Carangidae, Apogonidae, Gerreidae, Oxudercidae, Muraenidae, Gobiidae, Pomacentridae, Atherinidae, Chanidae, Sillaginidae, Drepaneidae, Lobotidae, Ambassidae, Mullidae, Zenarchopteridae, Acanthuridae, Engraulidae, Polynemidae, Chaetodontidae, Blenniidae, Leiognathidae, Tetraodontidae, Bothidae, Lutjanidae, Butidae, Syngnathidae, Belonidae, Tetraodontidae |
Cobertura Temporal
| Data Inicial / Data final | 2013-04-15 / 2013-04-24 |
|---|
| Data Inicial / Data final | 2014-04-01 / 2014-04-10 |
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Dados Sobre o Projeto
This data set was obtained following the missions carried out in April 2013 and April 2014 and responds to the agreements No. 2012/149/DEAL/SEPR as well as the project funded by the Ministry of Overseas Territories (Grant award order No. 12-024015-D). The aim of the work was to carry out an inventory of the fish species present in several mangroves of Mayotte. The April 2013 mission took place from April 15 to 24, 2013, and comprised eight days of fieldwork during which four sites were sampled multiple times: Dembéni, Malamani, Tsingoni, and Tsoundzou. The April 2014 mission took place from March 26 to April 15, 2014. It comprised nine days of fieldwork during which nine sites were sampled: Tsoundzou 1, Dembéni, Hajangoua, Bandrélé, Dapani, M’zouazia, Malamani, Chiconi, and Tsingoni.
| Título | Fish from the mangroves of Mayotte |
|---|---|
| Identificador | PMM_2013-2014 |
| Financiamento | agreement No. 2012/149/DEAL/SEPR Ministry of Overseas Territories Grant No. 12-024015-D). |
| Descrição da Área de Estudo | nine mangroves of Mayotte: Tsoundzou 1, Dembéni, Hajangoua, Bandrélé, Dapani, M’zouazia, Malamani, Chiconi, and Tsingoni. |
| Descrição do Design | The ultimate goal of this project was to determine the functional role that Mayotte's mangroves play with respect to different fish species. The management policy for Mayotte's coastal environments and the exploitation of lagoon resources can thus be based not only on a sound knowledge of the ecosystems but also on the best possible understanding of their functioning, as suggested by Bensoussan (2009) and Jeanson et al. (2010). Within the framework of this project, it was proposed that the role of Mayotte's mangroves in the life cycle of different fish species be addressed by establish an inventory of the species present, their developmental stages, and their relative abundances. |
O pessoal envolvido no projeto:
Métodos de Amostragem
Eleven different fishing gears were used: clove oil (anesthetic), cast net, dip net, 15mm mesh trammel net, 27mm mesh gillnet, 40mm mesh gillnet, 60mm mesh gillnet, beach seine, small fyke net, and large fyke net.
| Área de Estudo | In 2013, four mangroves of Mayotte were sampled multiple times: Dembéni, Malamani, Tsingoni, and Tsoundzou. In 2014, nine mangroves of Mayotte were sampled: Tsoundzou 1, Dembéni, Hajangoua, Bandrélé, Dapani, M’zouazia, Malamani, Chiconi, and Tsingoni. |
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Descrição dos passos do método:
- After each sampling event, all fish were identified to species level using available keys, and for each species, individuals were randomly selected for measurement and sexing. A fin fragment was preserved in 90% alcohol for later molecular analysis (COI barcoding). Some specimens were placed in formalin for future preservation in the MNHN collections.
Metadados Adicionais
| Acknowledgements | This work would not have been possible without the on-the-ground support of the staff of the Mayotte Marine Natural Park: A. « Volcan » Toilibou, S. Nouairdine, Paul, Salim et Souamadou (Parc Naturel Marin de Mayotte) for their help in field sampling. We thank Kissimati Abdallah, Hélène Decat, and Capucine Crosnier of DEAL Mayotte for their assistance during the 2013 and 2014 missions. We also thank the University Center of Mayotte for hosting us in their laboratory to process our samples during both missions. G. Boussarie, then a student at the ENS on a gap year, provided assistance both in the field and in the laboratory during the April 2014 mission. G. Mou-Tham (IRD) provided invaluable assistance both in the field and in the laboratory during the April 2014 mission. Sylvie Fiat of IRD Nouméa developed the database used to enter and manage the data obtained during this mission.This work was made possible thanks to funding from:• IRD, CNRS, and MNHN,• DEAL Mayotte (collaboration agreement No. 2012/149/DEAL/SEPR),• and the Ministry for Overseas Territories (grant award order No. 12-024015-D) |
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| Introduction | 1. Mangroves in the French Overseas TerritoriesMangroves are present throughout the French overseas territories in the intertropical zone, with the exception of Réunion Isalnd. They cover a total area of over 100,000 ha (Roussel et al. 2010). Despite their importance in terms of ecosystem services, comprehensive and consistent data on the fauna of these mangroves are still often lacking. Yet, these environments are subjected to numerous anthropogenic pressures: urban and tourism development, development for agriculture and aquaculture, river modifications, and pollution of all kinds constitute significant threats (Roussel et al. 2010).2. The Context of MayotteMid-2010s, the population of Mayotte was expected to reach 260,000, representing a density of 695 inhabitants per km². In this context, it seemed essential to integrate the Mayotte coastline into a viable and sustainable economic development plan (Jeanson et al. 2010). This integration is all the more urgent given that, according to the 2015 Water Management Master Plan: “slightly less than half of the watercourses are in good or very good condition; a significant proportion are of average and poor quality” (Mayotte Basin Committee 2009). According to the same report: “12% of marine water bodies are of good quality; these are mainly reef and lagoon water bodies. Half of the marine water bodies, primarily coastal waters, are in average condition due to documented siltation. Poor condition represents a quarter of the water bodies and corresponds to the coastal areas of the North and East, as well as Bouéni Bay, where siltation and deterioration of the fringing reefs are evident.” Finally, the large economic sector located between Grande-Terre and Petite-Terre (Mamoudzou–Dzaoudzi) encompasses the two bodies of water with poor quality (Mayotte Basin Committee 2009).This poor overall ecological status of Mayotte's coastal waters is confirmed by the sharp decline in the percentage of live corals on fringing reefs between 1989 and 2004 (Wickel et al. 2005b). For Mayotte's coastal environments, further time or additional actions would therefore be necessary to meet the objectives of the Water Framework Directive (Mayotte Basin Committee 2009). Only by taking into account coastal and lagoon areas within the framework of viable and sustainable economic development for the island will this situation be improved. Furthermore, such an approach should ensure the continuation of traditional marine resource exploitation, which in 2005 involved more than 4,300 households with an estimated landed production of over 2,000 tonnes (Roussel et al. 2010).3. State of knowledge on Mayotte's mangrovesThe sandy-muddy bays of Grande Terre in Mayotte are home to approximately 660 ha of mangroves, ranging in size from a few dozen m² to over 180 ha (Crémades 2010). Affected by timber harvesting (Crémades 2010), Mayotte's mangroves are also sites of illegal waste dumping and concentrations of non-biodegradable seaweed (Roussel et al. 2010). For several of these mangroves, the significant reductions in surface area observed over the last fifty years correspond to land development projects (LADYBIO & ESPACES 2003), unauthorized construction, and the expansion of cultivated land (French Marine Protected Areas Agency 2009). In general, the dynamics of Mayotte's mangroves are highly variable (Jeanson 2009). Thus, some mangroves that have not been impacted by human activity appear stable, whereas the increased erosion in their watershed should have led to their expansion (LADYBIO & ESPACES 2003). If mangroves did not play their role in sediment retention, the increased erosion observed throughout the island would certainly accelerate the already advanced process of lagoon siltation (LADYBIO & ESPACES 2003) and the destruction of fringing reefs (Wickel et al. 2005b).4. State of knowledge on the fish of MayotteIn Mayotte, 983 fish species were recorded in the TAXREF National Inventory of Natural Heritage database in 2014, and 690 in the compilation by Wickel et al. (2014)1. While reef-dwelling species have been the subject of several studies (Chabanet & Bigot 2001, Chabanet 2002, Chabanet et al. 2002, Wickel et al. 2005a), those partially or entirely dependent on mangroves have been much less studied (Wickel 2006). A short-term study, conducted in 2000 at five sites, identified 52 taxa (Deliot 2000), although some identifications in this study were limited to the family level, and fishing effort was restricted (types of gear and number of nights). To this preliminary work, a study must be added. |
| Getting Started | The data includes information on sampling events, species occurrences, COI sequences for some individuals, and lengths and weights for some individuals. |
| Propósito | During these two campaigns, 59 samples were obtained using 11 different fishing gears: clove oil (anesthetic), cast net, dip net, 15mm mesh trammel net, 27mm mesh gillnet, 40mm mesh gillnet, 60mm mesh gillnet, beach seine, small fyke net, and large fyke net. During these campaigns, samples were collected from marine waters (maximum observed salinity = 33.2) to practically fresh waters (minimum observed salinity = 0.3). Since the suitability of a given fishing gear depended on environmental conditions (bottom type, presence of obstacles, etc.), only a 27mm mesh net and a small fyke net were used at all sites. A total of 1,408 individuals were captured in 2013 and 1,308 in 2014. During these two campaigns, the Engraulididae and Carangidae families were the most abundant in the catches. These were followed by the Mugilidae, Ambassidae, Atherinidae, Sillaginidae, Leiognathidae, Gobiidae, Polynemidae, and Mullidae families. All other families (N=25) were represented by fewer than 50 individuals, with six of them (Acanthuridae, Bothidae, Chaetodontidae, Lobotidae, Serranidae, and Synodontidae) represented by only one individual. Compared to the list of fish species of Mayotte compiled by us in 2015 and containing more than 1,100 species, the two campaigns resulted in the capture of 16 species, all of which are new records for Mayotte, including several that are potentially new to science. Furthermore, the analyses carried out using molecular barcoding (COI) highlighted the numerous uncertainties surrounding the status of several species present in Mayotte. The fish assemblages studied at the family level, obtained using different gear, show a high degree of similarity from one year to the next. The assemblages differentiate quite well by gear, clearly demonstrating the value of a multi-gear approach for describing fish assemblages in mangroves. With the seine net, no clear differences between the different sites can be identified in the fish assemblages observed at the family level. For the other gears, the differences observed between samples from the same site are often greater than the differences observed between sites. Only the samples obtained using the large fyke net loaned by the Mayotte Marine Natural Park show differences in composition between sites. Given that this fyke net can only be used at river mouths, these differences would indicate differences in the use of downstream areas by different families rather than differences in the use of the mangroves themselves. Of the 34 families captured, 31 had a significant percentage of juveniles, exceeding 50% in 23 of them. Only three families—Hemiramphidae, Ambassidae, and Blenniidae—had 100% of individuals that could be considered adults. The highest proportions of juveniles were obtained with beach seines at all sites. Although seines can only be used in areas adjacent to mangroves with solid, unobstructed bottoms, this gear appears suitable for developing a study of mangrove use by juvenile fish based on fine spatial and temporal sampling. |
| Identificadores alternativos | https://ipt-entropie.ird.nc/resource?r=osteichthyes_mayotte |