SciELO - Scientific Electronic Library Online

 
vol.42 número2Las tafofloras triásicas de la región de los Lagos, Xma Región, ChileAnálisis de los anillos de crecimiento del bosque fósil de Víctor Szlápelis, Terciario inferior del Chubut, Argentina índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Articulo

Indicadores

  • No hay articulos citadosCitado por SciELO

Links relacionados

  • En proceso de indezaciónCitado por Google
  • No hay articulos similaresSimilares en SciELO
  • En proceso de indezaciónSimilares en Google

Bookmark


Ameghiniana

versión On-line ISSN 1851-8044

Resumen

MAUNA, Cecilia; CASADIO, Silvio; PARRAS, Ana  y  PASCUAL, Marcela. Abundance and distribution of Lithophaga (Mytilidae) in extant and fossil oysters: taphonomic and paleobiological implications. Ameghiniana [online]. 2005, vol.42, n.2, pp. 395-405. ISSN 1851-8044.

In this study we analyze the abundance and distribution patterns of Lithophaga patagonica in valves of Ostrea puelchana and compare them to those of Lithophaga sp. observed on the fossil species " Ostrea " patagonica and " Ostrea " alvarezii from the late Miocene Puerto Madryn Formation. No specimen of the fossil oysters showed borings of Lithophaga sp. on the interior surface of the valves. This suggests that they were produced while the oysters were still living and, at the same time, that the oyster beds were buried rapidly after death. In Ostrea puelchana the boring abundance was significantly higher for the left valve and, within it, the areas more heavily bored were the umbones and the platform. The same results were obtained for valves of " Ostrea " alvarezii , suggesting that this oyster showed life habits similar to the living one. On the other hand, in " Ostrea " patagonica the abundance of Lithophaga borings was the same on both valves. This agrees well with its life habit, in which the shells mainly are oriented almost vertically. The left valve of " Ostrea " patagonica showed no preferential location for the borings. In the right valves of " Ostrea " patagonica the posterior and anterior margins show perforation values that are higher than expected. Results suggest that the life position of oysters is one of the factors influencing the abundance and distribution of Lithophaga borings. This information is useful to infer the life position of fossil oysters and to reconstruct their taphonomic history.

Palabras llave : Lithophaga; Bioerosion; Oysters; Taphonomy; Miocene; Argentina.

        · resumen en Español     · texto en Inglés