Rawson Paul D, Yund Philip O, Lindsay Sara M
School of Marine Sciences, 5751 Murray Hall, University of Maine, Orono, ME 04469-5751, USA.
Science. 2007 Apr 6;316(5821):53; author reply 53. doi: 10.1126/science.1135099.
Freeman and Byers (Reports, 11 August 2006, p. 831) presented evidence for the rapid evolution of antipredator defenses in the mussel Mytilus edulis. However, their analysis is confounded by three issues. Samples from some sites are likely to have included a second species, M. trossulus; their manipulation of chemical cues does not preclude other interpretations; and they failed to establish an adaptive significance to shell thickening.
弗里曼和拜尔斯（《报告》，2006年8月11日，第831页）提供了紫贻贝抗捕食防御快速进化的证据。然而，他们的分析因三个问题而变得复杂。来自某些地点的样本可能包含第二种贻贝，即翡翠贻贝；他们对化学信号的操控并不能排除其他解释；而且他们未能确定贝壳增厚的适应性意义。
