Shykoff J A, Widmer A
Swiss Federal Institute of Technology, Experimental Ecology, ETHZ-NW, Zürich, Switzerland.
Naturwissenschaften. 1996 Mar;83(3):113-21. doi: 10.1007/BF01142175.
Evidence that selection by parasites maintains heritable variation in sexually selected signals (Hamilton-Zuk model) has proved equivocal. Bright individuals do not always have fewer parasites in intraspecific comparisons. Because the lymphocyte-based defence system and the production of some colors used in sexual signaling require carotenoids, we consider a trade-off between defence against parasites and sexual signals. The nature and the sign of the covariance between defence and signal brightness can vary. Depending on carotenoid availability and allocation, and the type of sexual signal, various relationships between parasite load and signal intensity are expected.
寄生虫选择维持性选择信号中可遗传变异的证据（汉密尔顿-祖克模型）已被证明是模棱两可的。在种内比较中，颜色鲜艳的个体寄生虫数量并不总是更少。由于基于淋巴细胞的防御系统以及性信号中使用的某些颜色的产生都需要类胡萝卜素，我们考虑在抵御寄生虫和性信号之间进行权衡。防御与信号亮度之间协方差的性质和符号可能会有所不同。根据类胡萝卜素的可用性和分配情况以及性信号的类型，预计寄生虫负荷与信号强度之间会有各种关系。
