Dynamique de la coque Cerastoderma glaucum (Mollusca, Bivalvia) dans la lagune Mellah (Algérie Nord-Est)

作者: Hayet Beldi , Brahim Draredja , Khalil Melouah

DOI: 10.12816/0027838

关键词: CockleCerastoderma glaucumBiologyForestry

摘要: Le travail presente etudie sur un cycle (mars 2010 – fevrier 2011) la densite, structure des tailles et croissance du mollusque Cerastoderma glaucum dans trois stations les berges (profondeur < 1.50 m) de lagune Mellah. Les densites C. varient entre 22 ± 9 ind.m-2 (station 1, janvier) 176 3, avril). biologique cette espece est caracterise par recrutement moins abondant en debut printemps, alors que celui l’ete plus important s’etale juin a septembre. L’etude ce bivalve utilisant methode indirecte, montre une rapide longueur durant premiere annee, ou jeunes recrues gagnent jusqu’a 21.33 mm. Durant deuxieme l’allongement taille individus diminue progressivement pour augmenter 5.57 mm seulement. La relation le poids chez coque Mellah proportionnelle, coefficient correlation eleve (r = 0.90). Par ailleurs, d’allometrie (b 2.62) pelecypode inferieur traduisant ainsi allometrie minorante, laquelle croit rapidement poids. Mots cles: Bivalve Abondance –Croissance Lagune El-Kala. This work studies on (March - February the density, size and growth of mollusc in three shore (depth <1.50 lagoon. Densities varies between January) April). The life this species is characterized by less abundant recruitment early spring, but summer one more lasts from June to September. study using indirect method shows significant length recruits (21.33 mm) during first year. Then, annual extension progressively decreases as individuals increases only second relationship weight for cockle Mellah, proportional, where high Also, allometric pelecypod than reflecting lower allometry which grows faster weight. Keywords: Abundance Growth Lagoon Mellah-

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