在秀丽隐杆线虫中，较大的精子比小精子更具竞争力。
Larger sperm outcompete smaller sperm in the nematode Caenorhabditis elegans.
作者信息
LaMunyon C W, Ward S
机构信息
Department of Molecular and Cellular Biology, University of Arizona, Tucson 85741, USA.
出版信息
Proc Biol Sci. 1998 Oct 22;265(1409):1997-2002. doi: 10.1098/rspb.1998.0531.
Abstract
Sperm competition is generally thought to drive the evolution of sperm miniaturization. Males gain advantage by transferring more sperm, which they produce by dividing limited resources into ever smaller cells. Here, we describe the opposite effect of size on the competitiveness of amoeboid sperm in the hermaphroditic nematode Caenorhabditis elegans. Larger sperm crawled faster and displaced smaller sperm, taking precedence at fertilization. Larger sperm took longer to produce, however, and so were more costly than smaller sperm. Our results provide evidence of a mechanism to support recent theoretical and comparative studies that suggest sperm competition can favour not small, but large sperm.
摘要
一般认为精子竞争推动了精子小型化的进化。雄性通过传递更多精子来获得优势，而这是通过将有限的资源分配到越来越小的细胞中产生的。在此，我们描述了大小对雌雄同体线虫秀丽隐杆线虫中变形虫状精子竞争力的相反影响。较大的精子爬行速度更快，取代了较小的精子，在受精时占优势。然而，较大的精子产生所需时间更长，因此比小精子成本更高。我们的结果为支持最近的理论和比较研究提供了一种机制的证据，这些研究表明精子竞争可能有利于大精子而非小精子。
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