Effect of geomagnetic field on migratory activity in a diurnal passerine migrant, the dunnock, Prunella modularis
Effect of geomagnetic field on migratory activity in a diurnal passerine migrant, the dunnock, Prunella modularis
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DOI：
10.1016/j.anbehav.2018.10.007
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发表时间：
2018-12-01
期刊：
影响因子：
2.5
通讯作者：
Akesson, Susanne
中科院分区：
文献类型：
--
作者：
Ilieva, Mihaela;Bianco, Giuseppe;Akesson, Susanne
迁徙的鸣禽在第一次迁徙时由一个内源性程序引导，编码迁徙的时间、距离和方向。为了成功地进行迁徙，鸟类进化出了飞行、加油和导航的表型适应。不同种类鸟类的迁徙距离被编码为表达迁徙不安的时期，其长度与迁徙距离相关。到目前为止，大部分的工作一直在夜间雀形目移民，而少得多的是已知的表型适应迁移在白天的移民。在这里，我们研究了秋季迁移燃料和表达的迁移活动在笼日迁移少年沙丘响应磁位移。我们保持一组（控制）在室内的位置捕捉在瑞典南部，而两个实验组逐渐（超过5天）位移磁东北部的位置或在法国西南部的越冬目的地。我们发现，所有的鸟类在白天都表现出两个活动高峰，活动的开始与日出和日落紧密相关。最长的活动（2-3小时）发生在早上，与该物种的自然迁移期相吻合。对于对照组，迁移（飞行）活动增加的季节（15天），而它是强烈减少的dunnocks流离失所的越冬地区。迁移到北方的鸟类表现出稳定的迁徙活动，但随着时间的推移略有减少。结果支持的发现，地磁信息预计将满足途中是重要的触发水平的迁移活动的少年的一个昼夜鸣禽移民。(C)2018动物行为研究协会。由爱思唯尔有限公司出版。保留所有权利。
Migratory songbirds are guided by an endogenous programme during their first migration, encoding timing of migration, distance and direction. To successfully perform migration, birds have evolved phenotypic adaptations for flight, fuelling and navigation. Migratory distance in different species of birds is encoded as a period of expressed migratory restlessness, for which the length is correlated with migratory distance. Most of the work so far has been on nocturnal passerine migrants, while much less is known about the phenotypic adaptations for migration in diurnal migrants. Here we studied autumn migration fuelling and expression of migratory activity in caged diurnally migrating juvenile dunnocks in response to magnetic displacements. We kept one group (control) indoors at the location of capture in south Sweden, while the two experimental groups were gradually (over 5 days) displaced magnetically to locations to the northeast or to the wintering destination in southwest France. We found that all birds showed two peaks of activity during the day, for which the onset of activity was tightly timed to sunrise and sunset. The longest activity (2-3 h) occurred in the morning, coinciding with the natural period of migration for this species. For the control group, the migratory (flight) activity increased with the season (15 days), while it was strongly reduced for the dunnocks displaced to the wintering areas. Birds displaced to the north showed a stable, but slightly reduced migratory activity over time. The results support the finding that geomagnetic information expected to be met en route is important for triggering level of migratory activity in juveniles of a diurnal songbird migrant. (C) 2018 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.