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免疫代价不是非洲爪蟾语音性信号真实度的维持机制
Immunological Costs are not Underlying Mechanisms in Maintaining Honesty of Acoustic Sexual Signals in Xenopus laevis
王小翠1,2, 陈竞峰1*, 唐业忠1
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作者单位:1. 中国科学院成都生物研究所, 成都 610041;
2. 中国科学院大学, 北京 100049
中文关键字:非洲爪蟾;免疫代价;性信号真实度;繁殖鸣叫
英文关键字:Xenopus laevis; immunological cost; honesty of sexual signal; breeding call
中文摘要:性选择理论认为,雄性性信号的真实度是雌性根据雄性表型质量进行配偶选择的前提。而维持这种真实度的机制普遍被认为是基于障碍原理,即性信号的表达必须付出与身体质量关联的存活代价,性信号与存活代价在个体内呈负的权衡关系,在个体间呈正相关关系。已有研究表明,免疫能力是表达性信号潜在的存活代价。但免疫代价在维持无尾两栖类语音性信号真实度中的作用尚不清楚。以非洲爪蟾为研究对象,在能量限制条件下采用灭活的大肠杆菌激活其免疫系统,测定鸣叫时长及相关繁殖行为表现,检验免疫能力与语音性信号表达间是否存在生理权衡。结果表明,免疫激活和能量限制对非洲爪蟾鸣叫时长和趋声行为都无影响;温度变化对鸣叫时长有显著作用。这些结果提示:非洲爪蟾语音性信号表达和免疫能力间不存在生理权衡,免疫代价不是非洲爪蟾语音性信号真实度的维持机制。
英文摘要:Sexual selection theory considers that the honesty of signaling males' phenotype quality is a requisite of female choice. Handicap principle proposes that the honesty/reliability is maintained by the fitness costs of signals which are associated with body condition. Immunocompetence is the survival cost of expressing sexual signals. However, it is unknown whether the immunological costs play certain roles in maintaining the honesty of acoustic sexual signals in frogs. In the present study, by using Xenopus laevis, the physiological trade-offs between acoustic sexual signals and immune function were investigated. Under food limitation condition, the immune system of X. laevis was first activated with heat-killed Escherichia coli, and then the call duration and the rate of phonotaxis associated reproductive activities were measured. The results showed that the intensity of acoustic sexual signals of X. laevis was markedly influenced by temperature instead of the activation of immune system. These results indicated that the physiological trade-offs between acoustic sexual signals and immune function may not explain the honesty of acoustic sexual signals in X. laevis.
2016,(35): 333-338 收稿日期:2016-01-27
DOI:10.11984/j.issn.1000-7083.20160025
分类号:Q959.5
基金项目:国家自然科学基金项目(31370431)
作者简介:王小翠(1990-),硕士研究生,研究方向:行为生态学与生态免疫学
*通讯作者:陈竞峰,E-mail:chenjf@cib.ac.cn
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