{"refrec":{"BRefID":6754,"RR":"<b>Guiral, D.; Arfi, R.; Da, K.P.; Konan-Brou, A.A.</b> (1993). Communautés, biomasses et productions algales au sein d'un récif artificiel (acadja) en milieu lagunaire tropical = Algal communities, biomasses and production in an artificial reef (Acadja) built in a brackish tropical lagoon. <i>Rev. Hydrobiol. Trop. 26(3)</i>: 219-228","BEntID":6754,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Rev. Hydrobiol. Trop. 26(3)</i>: 219-228","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Guiral, D.; Arfi, R.; Da, K.P.; Konan-Brou, A.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Guiral, D. <i>et al.</i>","Englishabstract":"In an extensive aquaculture structure established in an oligohaline and turbid area of the Ébrie Lagoon (Côte d'Ivoire), biomass production, energetic yields and specific composition of the phytoplanktonic and periphytic communities are compared. The structure, called acadja corresponds to an artificial reef of bamboo stuck into the sediment. The periphytic and phytoplanktonic biomasses within the acadja were 4 times higher than that of lagoon water and 73 % of this biomass corresponded to the fixed community. The total autotrophic production of acadja estimated at 9.9 g C.m-².j-¹ was 4.5 times higher than that of lagoon water, of which 80 % are produced by the periphytic population. This high productiuity of acadja is linked to: -an important spatial concentration of the periphyton which is not exposed to the hydrodynamic effects and is little affected by sedimentation processes; -a productiuity per biomass unit and a photosynthetic efficiency significantly higher for fixed communities than for pelagic communities. The periphyton included 3 groups of filamentous algae dominated by a Chlorophyceae <i>(Rhizoclonium riparium)</i> and some Cyanobacteria of the genus Lyngbia for the more productive surface layers and a Rhodophyceae <i>(Audouinella daviesii)</i> for deeper layers. These filamentous algae were in turn colonized by epiphytic Diatoms forming a diversified (37 species) sub-community dominated by the genera Melosira and Nitzschia. Considering the high photosynthetic yield of the fixed communities (5.2 % for periphyton against 0.8 % for phytoplankton), acadja allows a noticeable increase in the natural productivity of the lagoon environment. In acadja, phytophagous fish farming would constitute a possible use of the surplus autotrophic production.","AbstractOtherLang":"Dans un secleur oligohalin et turbide de la lagune Ébrie (Côte-d'Ivoire), les communautés phytoplanktonique et périphytique d'une structure d'aquaculture extensive, localement dénommée acadja (bambous plantés verticalement dans Ie sédiment), sont étudiées en termes de biomasses, productions, rendements énergetiques et composition specifique. Lors de cette étude, la biomasse algale au sein de l' acadja constituée à 73 % par du périphyton était 4 fois supérieure à celle des eaux libres lagunaires. L'assimilation autotrophe totale estimée à 9,9 g C.m-².j-¹ dans l'acadja était 4,5 fois supérieure à celle des eaux lagunaires et 80 % de cette activité sont dus au peuplement périphytique. Cette forte productivité de l' acadja est liée: - à une concentration spatiale importante du périphyton qui n'est pas soumis aux effets de l'hydrodynamisme et qui est peu affecte par les processus de sédimentation; - à une productivité par unité de biomasse et une efficacité photosynthétique significativement plus élevées pour les communautés fixées que pour les communautés pélagiques. Le périphyton colonisant les bambous comprenait 3 groupes d'algues filamenteuses. Une chlorophycée (Rhizoclonium riparium) et des cyanobactéries du genre Lyngbia dominaient pour les niveaux de surface les plus productifs, alors que les niveaux plus profonds étaient principalement colonisés par une rhodophycée <i>(Audouinella daviesii)</i>. Ces algues filamenteuses servaient en outre de support à des diatomées épiphytes constituant une sous-communauté diversifiée (37 espèces) dominée par les genres Melosira et Nietzschia. Compte tenu des forts rendements photosynthétiques des communautés fixées (5,2 % pour le périphyton contre 0,8 % pour le phytoplankton), l'acadja permet une augmentation sensible de la productivité naturelle du milieu lagunaire. Au sein d'une telle structure, l'élevage de poissons à régime alimentaire phytophage constituerait un mode de valorisation possible de ce surcroît de production autotrophe.","BibLvlCode":"AS","StandardTitle":"Communautés, biomasses et productions algales au sein d'un récif artificiel (acadja) en milieu lagunaire tropical = Algal communities, biomasses and production in an artificial reef (Acadja) built in a brackish tropical lagoon","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":1993,"MonPub":null,"DateUpdate":"2015-09-03","DateCreate":"2001-03-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":6754,"PubliDate":1993,"Pagination":"219-228","XtraPublOfAnaID":null,"ISBN":null,"Volume":"26","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43764,"SerRR":"Revue d'Hydrobiologie Tropicale. 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