Sexual ornamentation and parasite infection in males of common bream (Abramis brama): a reflection of immunocompetence status or simple cost of reproduction?
Sexual ornamentation and parasite infection in males of common bream (Abramis brama): a reflection of immunocompetence status or simple cost of reproduction?
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雄性鳊鱼（Abramis brama）的性装饰和寄生虫感染：免疫能力状态的反映还是简单的繁殖成本？
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Gelnar
中科院分区：
文献类型：
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作者：
Eva Ottová;A. Šimková;P. Jurajda;M. Dávidová;M. Ondračková;M. Pečínková;M. Gelnar
问：雄鱼的性定向与寄生虫感染、宿主免疫反应和身体状况有何关系？假设：Zahavi（1975）的障碍假设提出，产生第二性征代表了男性的一个相当大的障碍。此外，汉密尔顿和祖克（1982）提出，第二性征的表达揭示了对寄生虫的遗传抗性。生物体：产卵的公鲷（Abramis brama）及其几种寄生虫（三代虫属，双口吸虫属，Argulus spp.）。变量：寄生虫丰度（用于寄生虫感染）、脾脏大小（用于宿主免疫反应）和状况（用于体细胞状况状态）。结果：三代虫的数量随结节的增多而增多。鱼的头部结节越多，Diplostomum spp的数量越多。头节的平均长度越大，三代虫的数量越多。和Argulus spp.然而，我们没有发现脾脏大小与性取向或寄生虫感染之间的关系。脾脏较大的鱼在较差的身体状况，但条件是不相关的男性生殖或寄生虫丰度。结论：发展更密集的性行为的男性更容易受到后生动物体外寄生虫感染，支持汉密尔顿和祖克的假设。然而，我们的研究结果不支持类固醇激素免疫抑制降低免疫活性的假设。
Question: How does sexual ornamentation relate to parasite infection, host immune response and somatic condition status in male fish? Hypotheses: Zahavi’s (1975) handicap hypothesis proposes that producing secondary sexual traits represents a considerable handicap for males. Additionally, Hamilton and Zuk (1982) proposed that the expression of secondary sexual traits reveals a genetic resistance against parasites. Organisms: Spawning males of common bream (Abramis brama) and several of its parasites (Gyrodactylus spp., Diplostomum spp., Argulus spp.). Variables: Parasite abundance (for parasite infection), spleen size (for host immune response) and condition (for somatic condition status). Results: The more tubercles on the fish, the more abundant the Gyrodactylus spp. The more tubercles on the fish’s head, the more abundant the Diplostomum spp. The greater the mean length of the head tubercles, the more abundant the Gyrodactylus spp. and Argulus spp. However, we found no relationship between spleen size and either sexual ornamentation or parasite infection. Fish with larger spleens were in poorer somatic condition, but condition was not related to male ornamentation or parasite abundance. Conclusions: Males that develop more intensive sexual ornamentation are more susceptible to metazoan ectoparasite infection, supporting the hypothesis of Hamilton and Zuk. However, our results do not support the hypothesis that immunosuppression by steroid hormones reduces immunocompetence.