Chestnut-crowned babblers show affinity for calls of removed group members: a dual playback without expectancy violation
Chestnut-crowned babblers show affinity for calls of removed group members: a dual playback without expectancy violation
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栗冠鹛对被移除的群体成员的叫声表现出亲和力：双重回放，没有违反预期
DOI：
10.1016/j.anbehav.2015.02.022
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发表时间：
2015
期刊：
影响因子：
2.5
通讯作者：
Crane J
中科院分区：
文献类型：
--
作者：
Crane J
在栗冠穗鹛中，接触叫声是针对个体而非群体的。熟悉和不熟悉的叫声的双重广播测试了群体歧视。回放的个体被移除，避免了期望值的违反。穗鹛友好地接近广播熟悉的接触叫声的扬声器。群体识别似乎源于该物种的个体识别。合作育种通常在离散的，稳定的个体群体中进化，其中群体成员从合作行为中获得直接和/或间接的适应性益处。在这样的系统中，应该出现对群体歧视的强选择。尽管有这样的预测，相对较少的研究已经调查了合作脊椎动物的群体歧视的机制，许多结果可能会混淆的“预期违反”，因为测试个人的刺激来源仍然在组在实验期间。在这里，我们使用了一种新的实验协议，消除了这种混淆效应的测试组歧视合作育种栗冠穗鹛，Pomatostomus ruficeps，使用长距离接触呼叫。长途联系电话被发现是个人特定的，但缺乏明显的群体水平的签名。使用删除组和非组成员的双重回放，我们发现，这些电话允许有效的歧视：集团一致接近扬声器广播组成员的电话，并伴随着增加他们的联系电话率。总之，我们的研究结果表明，群体歧视来自个人认可。此外，群体成员对被移除成员的回放的亲和行为与所有其他研究中发现的对非群体成员的攻击性反应形成对比。对这些差异的一种解释源于我们消除了期望违背，但需要进一步的研究来验证这一点。
HighlightsContact calls are specific to individuals but not groups in chestnut-crowned babblers.Dual broadcasts of familiar and unfamiliar calls tested for group discrimination.Playback individuals were removed, avoiding expectancy violation.Babblers amicably approached the speaker broadcasting familiar contact calls.Group recognition seems to stem from individual recognition in this species.Cooperative breeding typically evolves within discrete, stable groups of individuals, in which group members derive direct and/or indirect fitness benefits from cooperative behaviour. In such systems, strong selection on group discrimination should emerge. Despite this prediction, relatively few studies have investigated the mechanism of group discrimination in cooperative vertebrates, and the results of many may be confounded by ‘expectancy violation’, since test individuals from which stimuli were derived remained in the group during experimentation. Here, we used a novel experimental protocol that eliminates this confounding effect in a test of group discrimination in cooperatively breeding chestnut-crowned babblers, Pomatostomus ruficeps, using long-distance contact calls. Long-distance contact calls were found to be individually specific, but to lack obvious group level signatures. Using dual playbacks of removed group and nongroup members, we found that these calls allow effective discrimination: groups unanimously approached the speaker broadcasting calls of group members and concomitantly increased their contact call rates. Together, our results suggest that group discrimination emerges from individual recognition. Additionally, the affiliative behaviour of group members towards playbacks of removed members contrasts with the aggressive responses towards nongroup members found in all other studies. One explanation for these differences stems from our elimination of expectancy violation, but further studies are required to verify this.
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