INVESTIGADORES
BRUSCHETTI Carlos Martin
congresos y reuniones científicas
Título:
Identifying internal shell growth bands in the patagonian scallop Zygochlamys patagonica (King and Broderip, 1832) in reclutas bed (39º 24 S 55º 56 W), Argentina.
Autor/es:
LOMOVASKY, B.; LASTA, M.; BRUSCHETTI, C.M.; IRIBARNE, O.O
Lugar:
Coquimbo, Chile
Reunión:
Congreso; XXIV Congreso de Ciencias del Mar. Sociedad Chilena de Ciencias del Mar.; 2004
Resumen:
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The Patagonian scallop is widely represented in
the extreme south of South America reaching 42ºS in
the Pacific and 36º15´S in the Atlantic between 40-200 m depth. It is an
important economic resource in the Atlantic where most productive beds are
located along the 100 m
isobath under influence of the shelf-break front. Accurate age determination is
essential to the assessment of population dinamics of Z. patagonica;
thus, studies to identify internal growth bands are necessary to confirm the
external growth rings and no underestimate
the age. Analysis the acetate peels of shell sections
were carried out and revealed the presence of alternating broad opaque and narrow translucent internal growth bands.
The internal growth pattern was clearly observed in the umbo, but it was more dificult to
interpret them along the cross section of the shell. For the first 2 or 3
bands, which were always very difficult to observe, the pattern observed was
different from other growth bands. Each external surface ring was associated
with a cluster of small internal growth bands. Thus, these cluster are the
results of slowed growth rate within the year. The acetate peels technique gave
the posibility to identify the internal growth band closer to the shell edge
which are very difficult to be identified on the exterior surface. Thus, using
this technique it will be possible to obtain new information about the maximum
age of the species. This study is the first describing the internal growth band
of Z. patagonica.
