Sperm delivery and egg production of the simultaneously hermaphroditic land snailArianta arbustorumexposed to an increased sperm competition risk
作者:
ROLF LOCHER,
BRUNO BAUR,
期刊:
Invertebrate Reproduction & Development
(Taylor Available online 2000)
卷期:
Volume 38,
issue 1
页码: 53-60
ISSN:0792-4259
年代: 2000
DOI:10.1080/07924259.2000.9652436
出版商: Taylor & Francis Group
关键词: Arianta arbustorum;land snail;reproduction;simultaneous hermaphrodite;sperm competition risk
数据来源: Taylor
摘要:
Sperm competition theory predicts that males exposed to an increased risk of sperm competition should maximize fertilization prospects by inseminating more sperm per ejaculate. We designed a laboratory experiment to examine the effect of increased sperm competition risk on male and female reproductive traits in individuals of the simultaneously hermaphroditic land snailArianta arbustorum.Courtship behaviour, spermatophore size and number of sperm delivered were not influenced by a higher sperm competition risk. However, snails constantly exposed to mucous trails of conspecifics deposited more egg batches than snails denied any cues from conspecific mucous trails. On the individual level, the number of sperm delivered was positively correlated with the number of eggs produced. This finding contradicts the basic prediction of sex allocation theory that there is a trade-off between resources allocated to male and female function in simultaneous hermaphrodites. Most probably this trade-off may only occur if resources are limited.
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