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首页> 外文期刊>Parasitology >Male gametocyte fecundity and sex ratio of a malaria parasite, Plasmodium mexicanum.
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Male gametocyte fecundity and sex ratio of a malaria parasite, Plasmodium mexicanum.

机译：疟原虫，疟原虫，男性配子体的生殖力和性别比。

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Evolutionary theory predicts that the sex ratio of Plasmodium gametocytes will be determined by the number of gametes produced per male gametocyte (male fecundity), parasite clonal diversity and any factor that reduces male gametes' ability to find and combine with female gametes. Despite the importance of male gametocyte fecundity for sex ratio theory as applied to malaria parasites, few data are available on gamete production by male gametocytes. In this study, exflagellating gametes, a measure of male fecundity, were counted for 866 gametocytes from 26 natural infections of the lizard malaria parasite, Plasmodium mexicanum. The maximum male fecundity observed was 8, but most gametocytes produced 2-3 gametes, a value consistent with the typical sex ratio observed for P. mexicanum. Male gametocytes in infections with higher gametocytaemia had lower fecundity. Male fecundity was not correlated with gametocyte size, but differed among infections, suggesting genetic variation for fecundity. Fecundity and sex ratio were correlated (more female gametocytes with higher fecundity) as predicted by theory. Results agree with evolutionary theory, but also suggest a possible tradeoff between production time and fecundity, which could explain the low fecundity of this species, the variation among infections, and the correlation with gametocytaemia.
机译：进化理论预测，疟原虫配子体的性别比将取决于每个雄性配子体产生的配子数（雄性繁殖力），寄生虫的克隆多样性以及任何降低雄性配子寻找和与雌配子结合能力的因素。尽管在性别比理论中将雄性配子体生殖力用于疟疾寄生虫很重要，但有关雄性配子体产生配子的数据很少。在这项研究中，从蜥蜴疟疾寄生虫（Plasmodium mexicanum）的26种自然感染中，对排卵的配子（一种雄性生殖力）进行了计数，计算出866个配子细胞。观察到的最大雄性繁殖力为8，但是大多数配子体细胞产生2-3配子，该值与观察到的墨西哥对虾的典型性别比一致。配子菌血症较高的感染中雄性配子体的生殖力较低。雄性生殖力与配子体细胞大小无关，但在感染之间有所不同，表明生殖力的遗传变异。正如理论所预测的那样，生殖力和性别比是相关的（雌性配子细胞更多，生殖力更高）。结果与进化论一致，但也暗示了生产时间和繁殖力之间可能的折衷，这可能解释了该物种的繁殖力低，感染之间的差异以及与配子体血症的相关性。

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