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Discriminating between geographical groups of a Mediterranean commercial clam (Chamelea gallina (L.): Veneridae) by shape analysis

AuthorsPalmer, Miquel ; Pons, Guillem X.; Linde, Marta
Inter-group discrimination
Canonical variate analysis
Chamelea gallina (L.)
Elliptic Fourier transformation
Image analysis
Issue Date2004
CitationFisheries Research 67(1): 93-98 (2004)
AbstractThe venerid clam Chamelea gallina is a popular food item around the Mediterranean countries, with clams differing in market price according to their origin. On Mallorca, autochthonous clams are 50-100% more valuable than those coming from the Adriatic Sea, the more important commercial fishery of the western Mediterranean. In order to promote the consumption of autochthonous clams and avoid fraud, the local government of the Balearic Islands inspects the source labelling of clams for sale. However, it is difficult to distinguish the Mallorcan clams from those coming from other sites only by visual inspection. Shape analysis is a possible discriminating procedure to be applied, but C. gallina is a rounded object apparently poorly suitable to be morphometrically analysed. Here we explore the discrimination power of a morphometric analysis that combines elliptic Fourier decomposition of the shell perimeter and canonical variate analysis. Specimens from Mallorca were well differentiated from those from Italy and NE Iberia (rate of erroneous assignment <1%), and were more similar to those from Andalucia (S. Iberia) and Formentera (Balearic Islands). Moreover, the analytical approach applied permits visual and intuitive interpretation of inter-group differences in shell outline. © 2003 Elsevier B.V. All rights reserved.
Identifiersdoi: 10.1016/j.fishres.2003.07.006
issn: 0165-7836
Appears in Collections:(IMEDEA) Artículos
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