La formacion de anillos de crecimiento en Fissurella crassa en el norte de Chile

Bretos, Marta

doi:10.1590/S0373-55241980000200014

Resumen

Growth discontinuity in molluscs result in the formation of rings on their shells. Two kind of rings may be formed: disturbance and growth rings. Growth rings can be used to determine the age of molluscs with long life span. For this, it is necessary to know how many growth rings are formed per year. It has been demonstrated experimentally, using marked specimens, that F. crassa forms two growth rings per year at Huayquique, Northern Chile. They are formed during winter and summer. Disturbance ring formation has also been observed as a result of sawing marks on their shells. A growth curve for this species is proposed on the basis of Watford's line.

ARTIGOS

La formacion de anillos de crecimiento en Fissurella crassa en el norte de Chile

Marta Bretos

Centro de Investigaciones Marinas, Universidad del Norte Sede Iquique, Iquique, Chile

SYNOPSIS

Growth discontinuity in molluscs result in the formation of rings on their shells. Two kind of rings may be formed: disturbance and growth rings. Growth rings can be used to determine the age of molluscs with long life span. For this, it is necessary to know how many growth rings are formed per year. It has been demonstrated experimentally, using marked specimens, that F. crassa forms two growth rings per year at Huayquique, Northern Chile. They are formed during winter and summer. Disturbance ring formation has also been observed as a result of sawing marks on their shells. A growth curve for this species is proposed on the basis of Watford's line.

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

Referencias bibliográficas

BORKOWSKI, T.V. 1974. Growth, mortality, and productivity of South Floridian Littorinidae (Gastropoda: Prosobranchia). Bul. mar. Sci, 24(2):409-438.
BRETOS, M. 1978. The Veliger, 27(2). (in press).
COE, W.R. 1947. Nutrition, growth and sexuality, in the pismo clam (Tivela stultorum). J. exp. Zool., 104:1-24.
SAKAI, S. 1960. Tohoku J. agric. Res., 11:239-224.
WALFORD, L.A. 1946. New graphic method of describing the growth of animals. Biol. Bull. mar. biol. Lab., Woods Hole, 90(2):141-147.
WILBUR, K. M. & OWEN, G. 1964. Growth. In: Wilbur, K. M. & Yonge, C. M. ed. - Physiology of Mollusca. New York, Academic Press, vol.1, p. 211-242.

Fechas de Publicación

Publicación en esta colección
06 Jun 2012
Fecha del número
1980

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] BORKOWSKI, T.V. 1974. Growth, mortality, and productivity of South Floridian Littorinidae (Gastropoda: Prosobranchia). Bul. mar. Sci, 24(2):409-438.

[2] BRETOS, M. 1978. The Veliger, 27(2). (in press).

[3] COE, W.R. 1947. Nutrition, growth and sexuality, in the pismo clam (Tivela stultorum). J. exp. Zool., 104:1-24.

[4] SAKAI, S. 1960. Tohoku J. agric. Res., 11:239-224.

[5] WALFORD, L.A. 1946. New graphic method of describing the growth of animals. Biol. Bull. mar. biol. Lab., Woods Hole, 90(2):141-147.

[6] WILBUR, K. M. & OWEN, G. 1964. Growth. In: Wilbur, K. M. & Yonge, C. M. ed. - Physiology of Mollusca. New York, Academic Press, vol.1, p. 211-242.