雌雄同体淡水蜗牛泡螺的自体受精与异体受精

SELF-FERTILIZATION VERSUS CROSS-FERTILIZATION IN THE HERMAPHRODITIC FRESHWATER SNAIL BULINUS GLOBOSUS.

作者信息

Jarne Philippe, Finot Luc, Delay Bernard, Thaler Louis

机构信息

Universite Montpellier II, Institut des Sciences de l'Evolution, Laboratoire Génétique et Environnement, Place E. Bataillon, 34095, Montpellier Cedex 5, FRANCE.

ORSTOM 2051, Avenue du Val de Montferrand, BP 5045, 34032, Montpellier Cedex 1, FRANCE.

出版信息

Evolution. 1991 Aug;45(5):1136-1146. doi: 10.1111/j.1558-5646.1991.tb04380.x.

DOI:10.1111/j.1558-5646.1991.tb04380.x

PMID:28564176

Abstract

Self-fertilization depression of fitness in the freshwater hermaphroditic snail Bulinus globosus, an intermediate host of the parasitic trematode Schistosoma, has been studied in a strain originating from Niger. B. globosus is an outcrosser that can self-fertilize when isolated before any copulation has occurred. The self-fertilization depression has been estimated during two successive generations. In the first generation, selfing was compared to outcrossing. Within each mating system group, selfing and outcrossing were compared again in the second generation. A striking difference was shown in favor of cross-fertilization for the number of eggs laid, the survival at birth of young snails and the number of snails reaching sexual maturity. The overall self-fertilization depression is 0.920 after two generations of selfing. We discuss the relative role of selfing and outcrossing in the evolution of freshwater snail populations.

摘要

作为寄生吸虫血吸虫中间宿主的淡水雌雄同体蜗牛泡状钉螺，其自交对适合度的抑制作用已在源自尼日尔的一个品系中得到研究。泡状钉螺是异交生物，在未发生任何交配前隔离时能够进行自交。自交对适合度的抑制作用在连续两代中进行了估算。在第一代中，将自交与异交进行了比较。在每个交配系统组内，第二代又对自交和异交进行了比较。在产卵数量、幼螺出生时的存活率以及达到性成熟的蜗牛数量方面，均显示出有利于异交的显著差异。经过两代自交后，总体自交对适合度的抑制作用为0.920。我们讨论了自交和异交在淡水蜗牛种群进化中的相对作用。