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周亚,邓可,朱弼成,崔建国.2021.工作记忆对雌性锯腿原指树蛙配偶选择的影响.动物学杂志,56(4):481-490.
工作记忆对雌性锯腿原指树蛙配偶选择的影响
The Effect of Working Memory on Female Mate Choice in Kurixalus odontotarsus
投稿时间:2021-02-09  修订日期:2021-06-30
DOI:10.13859/j.cjz.202104001
中文关键词:  鸣声复杂性  工作记忆  性选择  求偶信号  锯腿原指树蛙
英文关键词:Call complexity  Working memory  Sexual selection  Mating signals  Kurixalus odontotarsus
基金项目:国家自然科学基金项目(No. 31772464),中国科学院青年创新促进会项目(No. 2012274),生态环境部生物多样性保护与评估专项(No. 2019HJ2096001006)
作者单位E-mail
周亚 中国科学院成都生物研究所 成都 zhouya@cib.ac.cn 
邓可 中国科学院成都生物研究所 成都 dengke@cib.ac.cn 
朱弼成 中国科学院成都生物研究所 成都 zhubc@cib.ac.cn 
崔建国 中国科学院成都生物研究所 成都 cuijg@cib.ac.cn 
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中文摘要:
      大多数无尾两栖类的配偶选择依赖声音通讯。为吸引雌性,雄性可通过增加音节数量或鸣声复杂性的方式提升鸣声吸引力。工作记忆是指在进行复杂认知活动时对过去短时间内接收到的信息进行处理和储存的一种记忆程序。目前,大多数无尾两栖类鸣声通讯研究侧重于揭示鸣声信号的功能,但关于工作记忆对雌性配偶选择的影响及其在复杂求偶信号进化过程中的作用的研究十分匮乏。本研究以锯腿原指树蛙(Kurixalus odontotarsus)为实验对象,利用趋声性实验测试雌性对不同复杂程度鸣声信号的工作记忆。雄性锯腿原指树蛙的鸣声主要包含A音节(“呱”音)和B音节(“啾”音),两类音节可以组成不同复杂程度的鸣声,如简单的广告鸣叫5A、复杂的组合鸣叫5A2B和5A5B。实验过程中为雌蛙播放不同复杂程度的鸣声刺激对(5A vs. 5A2B及5A vs. 5A5B),然后进行不同时长安静处理(0 s、5 s、10 s、15 s和30 s)。若安静处理后大部分雌蛙仍选择之前播放复杂鸣声的音箱,则认为此次安静处理时长在雌性对复杂鸣声的工作记忆范围内。实验数据通过广义估计方程(GEE)和精确二项分布检验进行统计分析。研究结果表明,相较于5A,雌性对组合鸣叫5A2B的工作记忆大约有15 s,对5A5B的工作记忆大约有10 s;而组间比较结果表明,雌性对于5A2B和5A5B的工作记忆没有显著性差异。因此,本研究认为复杂鸣声信号会通过工作记忆影响雌性的行为决策,且工作记忆对复杂鸣声信号进化的影响可能具有物种特异性。
英文摘要:
      Most anurans primarily rely on sound communication for mate choice. To attract females, males might increase the number of syllables or signal complexity to enhance the attractiveness of calls. Working memory refers to memory that involves storing and manipulating information for relatively short time when conducting complex cognitive tasks. Now many studies focus on the functions of the vocal signals, while pay less attention to the effects of working memory on female mate choice and the evolution of complex sexual signals. In this study, phonotaxis experiments were performed to test the working memory of female serrate-legged small treefrogs (Kurixalus odontotarsus, Fig. 1) for different advertisement calls. The treefrogs can produce different calls of graded complexity that contains broadband A note and / or narrowband B note, such as simple advertisement call 5A (a call that contains five A notes) and complex combined calls 5A2B (a call that contains five A notes plus two B notes) / 5A5B (a call that contains five A notes plus five B notes) (Fig. 2). During the experiments, females were exposed to different sound stimulating pairs (5A vs. 5A2B, 5A vs. 5A5B) and then treated with different silent periods (0 s, 5 s, 10 s, 15 s, 30 s) before choosing (Fig. 3). If most females still preferred the speaker that had broadcasted more complex call before, we considered that this silent time was within females’ working memory for more complex call. In addition, the data were processed with generalized estimating equation (GEE) and exact binomial test in SPSS 25.0. As a result, we found that females’ working memory for 5A2B was about 15 s (Fig. 4) and for 5A5B was about 10 s (Fig. 6) compared with 5A, but the comparison between groups showed that there was no significant difference between females’ working memory for 5A2B and 5A5B. The latency of female choosing when broadcasting 5A vs. 5A2B before was significantly longer than that of broadcasting 5A vs. 5A5B before (Fig. 5, Fig. 7). In conclusion, this study demonstrates that working memory of female serrate-legged small treefrogs for complex vocal signals can influence the decision-making of female mate choice, but the effect of working memory on driving the evolution of complex mating signals may be species-specific.
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