The wild side of life
The wild side of life
复制标题
生活狂野的一面
作者：
T. Markow;S. Beall;S. Castrezana
果蝇物种在雌性重新交配的速度和它们在实验室中获得的精子数量上各不相同。在D.黑腹果蝇D. pseudobscura，其中女性接受数以千计的精子和remate很少相比，物种，如D。hydei和D.在黑旋藻中，雌性只能接受几百个精子，一天内要交配很多次，野生捕获的雌性应该会产生更多的后代。我们测试了这一预测收集，直接从自然界中，女性的再交配率和精子数量从高到低不等，并评估女性的比例与精子和后代女性生产的数量。95%以上的D. Pseudobscura和D.雌性黑腹果蝇被授精，而其他物种中含有精子的要少得多。此外，拟暗纹瓢虫雌虫产卵时间超过2周，拟暗纹瓢虫雌虫产卵时间超过2周。melanogaster一周以上，而D. hydei和D.黑旋藻雌虫在1-2 d后精子耗尽。这些观察结果表明，在这些后一种物种中，精子受到了极大的限制。
Drosophila species vary in the rates at which females remate and the number of sperm they receive in the laboratory. In species such as D. melanogaster and D. pseudoobscura, in which females receive thousands of sperm and remate infrequently compared with species such as D. hydei and D. nigrospiracula, where females receive only a few hundred sperm and remate many times in a day, wild caught females should produce far more progeny. We tested this prediction by collecting, directly from nature, females of six species whose remating rates and number of sperm received vary from high to low and assessing the proportion of females with sperm and the number of progeny females produce. Over 95% of D. pseudoobscura and D. melanogaster females were inseminated while far fewer of the other species contained any sperm. In addition, D, pseudoobscura females produced progeny for over two weeks, D. melanogaster for over a week, while D. hydei and D. nigrospiracula females ran out of sperm after 1–2 d. These observations suggest extreme sperm limitation in these latter species.