{"refrec":{"BRefID":6750,"RR":"<b>Guiral, D.; Gourbault, N.; Helleouet, M.-N.</b> (1995). Etude sédimentologique et méiobenthos d'un écosystème lagunaire modifié par un récif artificiel à vocation aquacole: l'acadja = Sediment nature and meiobenthos of an artificial reef (Acadja) used for extensive aquaculture. <i>Oceanol. Acta 18(5)</i>: 543-555","BEntID":6750,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Oceanol. Acta 18(5)</i>: 543-555","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Guiral, D.; Gourbault, N.; Helleouet, M.-N.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Guiral, D.; Gourbault, N.; Helleouet, M.-N.","Englishabstract":"In developing countries, recourse to extensive aquaculture systems based on the exploitation of natural aquatic food webs is currently the subject of considerable interest. In this connection, the construction of artificial reefs (known as Acadja) for the development on substrates of living communities, and the utilization of this new production to enhance fish growth have been evaluated in Côte d'Ivoire. This paper describes the granulometric, chemical and biological transformation of the sedimentary ecosystem as a consequence of this practice. In the artificial habitat, an increase in the sedimentation rate of the mineral fraction (definitive trapping of particle resuspension generated by the waves and induced by the wind) and of the organic fraction (direct and indirect sedimentation of the epiphytic biomass) constitutes the starting point of significant modifications in epibenthic communities. In the Acadja, the meiofauna, dominated by nematodes and copepods, is somewhat less diversified, some groups being absent or poorly represented (turbellarians, gastrotrichs, ostracods). These characteristics were confirmed by a specific study of the nematode assemblages. In fact, the relatively high diversity of the nematode community in the natural lagoon sediment (dominated seasonally by <i>Paraphanolaimus</i>, <i>Anonchus</i> et <i>Daptonema</i>) contrasts with low diversity in the Acadja sediment, where the community is always dominated by <i>Theristus</i> sp. This lower specific diversity generates a reduction of the trophic types. In the Acadja, only the non-selective detritus feeders colonize the fine and organic sediment. These sedimentological and ecological transformations, which affect the entire \"brush park\" (Acadja), induce a strong eutrophication of the benthic ecosystem. Sustainable fish production in such tropical lagoons, in an environment where anaerobic processes dominate (especially sulfato-reduction), calls for strategic spatio-temporal planning to take of account of this progressive eutrophication.","AbstractOtherLang":"Le recours à des techniques d'aquaculture extensive, qui privilégient la productivité naturelle du milieu et son exploitation directe par les poissons en élevage, bénéficie actuellement d'un grand intérêt dans les pays en voie de développement; ainsi, la réalisation de récifs artificiels pour le développement d'organismes fixés a été testée en Côte-d'Ivoire. Le présent travail décrit les transformations du milieu sédimentaire (granulométrique, chimique et biologique) liées à la réalisation de ce type d'aquaculture. La modification des taux de sédimentation minérale (par piégeage des particules remises en suspension dans le milieu libre environnant lors des turbulences initiées par le vent) et organique (par sédimentation directe ou indirecte via le broutage des productions épiphytiques) au sein de la structure d' élevage est à l' origine d 'une importante transformation des communautés qui colonisent les sédiments de surface. Globalement, la méiofaune, dominée par les nématodes et les copépodes, y est moins diversifiée du fait de la disparition et de la raréfaction de certains groupes (turbellariés, gastrotriches, ostracodes). La tendance est confirmée par une étude plus approfondie des nématodes. Par opposition au peuplement diversifié des sédiments lagunaires où prédominent, selon les saisons, les espèces des genres <i>Paraphanolaimus</i>, <i>Anonchus</i> et <i>Daptonema</i>, la communauté est moins diversifiée au sein de l'acadja car elle est en permanence dominée par une espèce du genre <i>Theristus</i>. Cette diminution de diversité spécifique s'accompagne d'une réduction des types trophiques avec une représentation quasi exclusive des détritivores non sélectifs. Les transformations sédimentologiques et biologiques, qui affectent l'ensemble de la zone occupée par l'acadja, traduisent une eutrophisation de plus en plus marquée des sédiments. Pour une production aquacole durable et dans un contexte initialement propice à des processus de minéralisation anaérobie de la matière organique (sulfato-réduction);cette eutrophisation progressive impose des stratégies d'exploitation des sites lagunaires discontinues dans le temps et l'espace.","BibLvlCode":"AS","StandardTitle":"Etude sédimentologique et méiobenthos d'un écosystème lagunaire modifié par un récif artificiel à vocation aquacole: l'acadja = Sediment nature and meiobenthos of an artificial reef (Acadja) used for extensive aquaculture","OrigTitleLangCode":"fr","OrigTitleLangCodeExtended":"fre","OrigTitleLangID":22,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1995,"MonPub":null,"DateUpdate":"2004-02-11","DateCreate":"2001-03-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":6750,"PubliDate":1995,"Pagination":"543-555","XtraPublOfAnaID":null,"ISBN":null,"Volume":"18","Issue":"5","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43599,"SerRR":"Oceanologica Acta. 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