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Investigaciones marinas

versión On-line ISSN 0717-7178

Resumen

BAEZ, Pedro; ARATA, Javier  y  JACKSON, Donald. El loco Concholepas concholepas (Bruguière, 1789) (Mollusca: Gastropoda: Muricidae) during the Early-Middle Holocene of Los Vilos, central Chile. Investig. mar. [online]. 2004, vol.32, n.1, pp.107-113. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71782004000100010.

The relative abundance of "el loco", Concholepas concholepas, and the possible causes of its variability in cultural shell deposits dated from the Early-Middle Holocene of Los Vilos littoral (31º55'S, 71º32'W) were studied. The samples were obtained in archaeologic excavations from five sites. These samples were dated with C14: Punta Purgatorio (LV079: 10.040 ± 70 years before present, y.b.p.), Caleta Ñagué (LV098: 10.120 ± 80 y.b.p.), Dunas de Agua Amarilla (LV166: 6.700 ± 60 y.b.p.), Borde Norte de Quebrada de Quereo (LV036: 6.030 ± 80 y.b.p.) and Fundo Agua Amarilla (LV099: 5.480 ± 70 y.b.p.). These gastropod shells correspond to juvenile and young adult specimens, whose lengths oscillate between 20 and 145 mm. The wide range of sizes found indicates that collectors did not make mollusk selection by sizes during the captures. The majority of these specimens are of a size longer than 50 mm. This latter length corresponds to first maturity size found in current Concholepas concholepas populations. The abundance of this species in the shellmidden is greater in the most recent sites: 46,200 specimens in LV166 and 4,185,000 in LV036. The variability in the records substantiates the hypothesis that the principal cause in the observed changes was originated in palaeoclimatic changes that affected directly the ecologic characteristics of the region, and influenced, indirectly, the species extraction

Palabras clave : gastropods; Holocene; coastal resources; Los Vilos; Chile.

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