Evidence for aggressive mimicry in an adult brood parasitic bird, and generalized defences in its host.
Evidence for aggressive mimicry in an adult brood parasitic bird, and generalized defences in its host.
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DOI：
10.1098/rspb.2015.0795
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发表时间：
2015-07-07
期刊：
影响因子：
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通讯作者：
Spottiswoode CN
中科院分区：
文献类型：
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作者：
Feeney WE;Troscianko J;Langmore NE;Spottiswoode CN
一种无害模式的模仿（攻击性模仿）是由卵、小鸡和羽翼未熟的幼虫寄生虫使用的，它们与宿主自己的卵、小鸡和羽翼未熟的幼虫相似。然而，成年寄主也可能进化出攻击性模仿，以避免宿主的攻击和/或操纵寄主对寄生风险的感知。我们验证了一种假设，即雌性杜鹃雀（Anomalospiza imberbis）是雌性杜鹃织布者（Euplectes weavers）的攻击性模仿者，比如无害的、数量丰富的、同域的南方红雀（Euplectes orix）。我们发现雌性杜鹃雀的羽毛颜色和图案更接近于Euplectes weavers（假定模型），而不是Vidua雀（近亲）；它们的茶色侧翼的priia （priia subflava）宿主对雌性杜鹃雀和南方红雀同样具有攻击性，对两者的攻击性都比对雄性同类更强；在看到雌性杜鹃雀或主教后，首领们同样有可能拒绝一个蛋，比在鸟巢附近看到雄性主教时更有可能这样做。据我们所知，这是成年鸟类攻击性模仿的第一个定量证据，并表明宿主-寄生虫共同进化可以在繁殖周期的所有阶段选择鸟类幼虫寄生虫的攻击性模仿和宿主的反防御。
Mimicry of a harmless model (aggressive mimicry) is used by egg, chick and fledgling brood parasites that resemble the host's own eggs, chicks and fledglings. However, aggressive mimicry may also evolve in adult brood parasites, to avoid attack from hosts and/or manipulate their perception of parasitism risk. We tested the hypothesis that female cuckoo finches (Anomalospiza imberbis) are aggressive mimics of female Euplectes weavers, such as the harmless, abundant and sympatric southern red bishop (Euplectes orix). We show that female cuckoo finch plumage colour and pattern more closely resembled those of Euplectes weavers (putative models) than Vidua finches (closest relatives); that their tawny-flanked prinia (Prinia subflava) hosts were equally aggressive towards female cuckoo finches and southern red bishops, and more aggressive to both than to their male counterparts; and that prinias were equally likely to reject an egg after seeing a female cuckoo finch or bishop, and more likely to do so than after seeing a male bishop near their nest. This is, to our knowledge, the first quantitative evidence for aggressive mimicry in an adult bird, and suggests that host–parasite coevolution can select for aggressive mimicry by avian brood parasites, and counter-defences by hosts, at all stages of the reproductive cycle.