Drivers of alloparental provisioning of fledglings in a colonially breeding bird
Drivers of alloparental provisioning of fledglings in a colonially breeding bird
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DOI：
10.1093/beheco/araa137
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发表时间：
2021-03
影响因子：
2.4
通讯作者：
Mina Ogino;A. Maldonado‐Chaparro;D. Farine
中科院分区：
文献类型：
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作者：
Mina Ogino;A. Maldonado‐Chaparro;D. Farine
20、繁殖成本高。尽管如此，有证据表明父母有时会喂养不相关的后代。有几种假说可以解释这一令人困惑的现象。成年人可以喂养22个不相关的后代，这些后代是他们的亲密社会伙伴，以促进这些青少年融入他们的社会网络（社会遗传假说），（2）潜在的额外的24对后代，（3）在一个类似的发展阶段，作为自己的，（4）强迫喂养乞讨，或（5）欠发达（以提高它们的生存率，这可能有利于成年或其26个后代;群体扩增假说）。殖民繁殖者是研究这些假设的相对重要性的理想选择，因为后代通常被关在托儿所里，在那里成年人可以表现出异源喂养。使用自动化监测复制圈养斑胸草雀29（Taeniopygia guttata）殖民地，我们发现，而父母选择性地喂养自己的30个后代，他们也一贯喂养无关的后代（32.48%的喂养事件）。在繁殖之前，成年人之间的社会关系并不能预测异体喂养，也不是针对潜在的遗传后代的异体喂养。相反，有更发达的后代的成年人在与自己的后代相似的发育阶段优先喂养发育较低的非后代，这种趋势不能用乞讨行为的差异来解释。我们的研究表明，异源喂养与群体扩增是一致的，36通过群体维持或增加后代存活可能使成年人受益。37 38
20 Reproduction is costly. Despite this, evidence suggests that parents sometimes feed unrelated 21 offspring. Several hypotheses could explain this puzzling phenomenon. Adults could feed 22 unrelated offspring that are (1) of their close social associates to facilitate these juveniles’ 23 integration into their social network (the social inheritance hypothesis), (2) potential extra24 pair offspring, (3) at a similar developmental stage as their own, (4) coercing feeding by 25 begging, or (5) less-developed (to enhance their survival, which could benefit the adult or its 26 offspring; the group augmentation hypothesis). Colonial breeders are ideal for investigating 27 the relative importance of these hypotheses because offspring are often kept in crèches where 28 adults can exhibit allofeeding. Using automated monitoring of replicated captive zebra finch 29 (Taeniopygia guttata) colonies, we found that while parents selectively fed their own 30 offspring, they also consistently fed unrelated offspring (32.48% of feeding events). Social 31 relationships among adults prior to breeding did not predict allofeeding, nor was allofeeding 32 directed towards potential genetic offspring. Instead, adults with more-developed offspring 33 preferentially fed less-developed non-offspring over non-offspring at a similar developmental 34 stage as their own offspring, and this tendency was not explained by differences in begging 35 behaviour. Our study suggests that allofeeding is consistent with group augmentation, 36 potentially benefiting adults through colony maintenance or increased offspring survival. 37 38