Operational sex ratios and sperm limitation in populations of Drosophila pachea
Operational sex ratios and sperm limitation in populations of Drosophila pachea
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果蝇种群的可操作性别比和精子限制
DOI：
--
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发表时间：
1993
影响因子：
2.3
通讯作者：
S. Pitnick
中科院分区：
文献类型：
--
作者：
S. Pitnick
雄性嗜食果蝇产生的精子相对较少，但非常大，并将有限的配子数量分配给连续的配偶。目前的研究发现，在羽化后，雄性比雌性多花10天时间成熟性成熟。睾丸发育的模式表明，需要产生足够长的时间来制造巨大精子的睾丸是男性成熟延迟的原因。这些发现产生了这样的预测，即人口的可操作性性别比(OSR)将偏向女性。研究了自然种群的大小、性别比和OSR。总体而言，当地人口往往很少，性别比例往往略有男性偏见。然而，正如预测的那样，至少在一个季节，种群的OSR倾向于以雌性为主，平均每只性行为活跃的雄性有2.3只接受雌性。确定雌性繁殖频率与适合度以及种群OSR与生产力之间关系的实验室实验结果表明，具有雌性偏见的OSR的自然种群是精子受限的。从种群结构的角度讨论了精子巨大症的起源和维持，以及男性异常的精子分割行为。
Males of the cactophilic fruitfly, Drosophila pachea, produce relatively few but very large sperm, and partition their limited gamete numbers among successive mates. The present study found that males take 10 days longer than females, post-eclosion, to become sexually mature. The pattern of testes development suggests that the need to produce testes long enough to manufacture the giant sperm is the cause of the delayed male maturity. These findings generate the prediction that the operational sex ratio (OSR) of populations will be female-biased. The size, sex ratio, and OSR of natural populations were examined. In general, local populations tended to be small and sex ratios tended to be slightly male-biased. However, as predicted, the OSR of populations, at least in one season, tended to be female-biased, with an average of 2.3 receptive females for each sexually active male. Results of laboratory experiments to determine the relationship between female remating frequency and fitness, and between population OSR and productivity, suggest that natural populations with female-biased OSRs are sperm-limited. The origin and maintenance of sperm gigantism and the unusual sperm-partitioning behavior of males are discussed with respect to population structure.
昆虫交配系统的进化
DOI：
10.1093/acprof:oso/9780199678020.003.0004
发表时间：
2014
期刊：
--
影响因子：
--
作者：
Ritchie M
通讯作者：
Ritchie M