Estructura poblacional, crecimiento y producción de la coquina Donax trunculus en la zona intermareal del litoral of Huelva
ISSN: MA 1272-2015
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AuthorsDelgado, M. (Marina); Silva, L. (Luis); Gómez, Santiago; Masferrer, Esther; Cojan, Miguel; Terrón, Alejandro; Gaspar, Miguel
Editor/sDiaz del Rio, Victor; Barcenas, P.; Fernández-Salas, L.M. (Luis Miguel); López-González, N. (Nieves); Palomino, D. (Desirée); Rueda, J.L. (José Luis); Sánchez-Guillamón, O. (Olga); Vázquez, J.T. (Juan Tomás)
KeywordsDonax trunculus, Huelva coast, lenght-frecuency distribution, thin shell cross sections, production
Population structure, growth and production of the wedge clam Donax trunclus, inhabiting highly exposed sandy beaches of the littoral of Huelva (SW Spain) were investigated between January 2014 and July 2015. Growth rates were estimated comparing two different methods in the intertidal zones of beaches: (i) length-frequency distributions (LFD) analysis in two separated beaches (Doñana and Isla Canela) (ii) internal shell growth bands by thin shell cross sections (TS). For the TS methodology, valves were embedded in methyl-methacrylate, and sequential sections were grounded and polished to a thickness of 80-100 µm. This technique allowed the identification of annual ring depositions and the shell length-age keys were performed. In addition, several deformities (related to environmental stress or damages probably caused by fishing gears) as well as signs or recovery were observed. Both methodologies were equally appropriate to estimate growth of D. trunculus. Von Bertalanffy growth functions ...
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