Reproductive condition and tentacle extirpation in malayan achatina fulica (Pulmonata)

Berry, A.J. and Chan, L.C. (1968) Reproductive condition and tentacle extirpation in malayan achatina fulica (Pulmonata). Australian Journal of Zoology, 16 (5). pp. 849-855. ISSN 0004-959X

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Official URL: https://doi.org/10.1071/ZO9680849

Abstract

Some individuals of A. fulica in Malaya have active gonads at all times of the year. Several criteria indicate, however, that reproductive activity is greatest in July-December and declines to a minimum in March. There is some evidence that this cycle is related to rainfall, and that year-by-year differences in rainfall affect fluctuations in reproductive condition. A. fulica with their ocular tentacles removed produced significantly more shelled eggs than normal snails and also had more large oocytes in their gonads. When albumen glands were full, numbers of shelled eggs were significantly greater than when albumen glands were reduced. In snails with small albumen glands, removal of tentacles caused oocytes in the gonad to increase more markedly than shelled eggs. It is suggested that the general nutritional condition of the snail affects its ability to form complete shelled eggs, but not its ability to produce oocytes in the gonad. The latter appears to be under a hormonal control involving the tentacles, rather like that proposed by Pelluet and Lane (1961). © 1968, CSIRO. All rights reserved.

Item Type: Article
Additional Information: Berry, A.J., Chan, L.C. School of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia.
Uncontrolled Keywords: Reproductive; tentacle extirpation; malayan achatina fulica (Pulmonata)
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms Maisarah Mohd Muksin
Date Deposited: 10 Jul 2013 00:57
Last Modified: 30 Oct 2020 01:53
URI: http://eprints.um.edu.my/id/eprint/6997

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