Perceived wintering latitude determines timing of song output in a migratory bird
Perceived wintering latitude determines timing of song output in a migratory bird
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感知的越冬纬度决定了候鸟发出声音的时间
DOI：
10.1002/ece3.5922
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发表时间：
2019
影响因子：
2.6
通讯作者：
Fudickar, Adam M.
中科院分区：
文献类型：
--
作者：
Brewer, Dustin E;McGill, Clint A;Fudickar, Adam M.
候鸟种群通常由在离繁殖地不同距离越冬的个体组成。随纬度变化的光周期的季节性变化是鸟类歌唱频率的季节性变化的基础。因此，由在不同纬度和较大越冬范围越冬的个体组成的迁徙种群在季节性鸣禽生产方面可能会经历种群内部的变化。为了检验越冬纬度对春季鸣禽量种群内变异的影响，我们对来自同一部分迁徙繁殖种群的两组东部宋麻雀（Melospiza melodia melodia）进行了不同的光周期安排，并在1300公里的越冬地点差异下进行了实验。其中一组保持在繁殖地的自然光周期（常驻组），而另一组则经历了一个非繁殖地的光周期，模仿了秋天的南方迁徙，然后在春天的北方迁徙（迁徙组）。我们比较了两组在三个不同阶段（非繁殖期、预繁殖期和繁殖期）的鸣叫声。在非繁殖期取样日（11月20日至12月6日），留鸟组几乎没有鸣叫，迁徙鸟组没有鸣叫。在前繁殖阶段（1月27日和2月7日），常住组的鸣叫明显多于迁徙组。在繁殖阶段（3月21日和4月4日），模拟候鸟迁徙后，两组的鸣声输出相似。这些结果表明，种群内越冬纬度的变化可能导致鸣叫行为的季节性变化，而鸣叫行为的季节性变化可能与繁殖意愿相关。为了更好地理解这些过程，还需要利用已确认的移民和居民进行研究，而不仅仅是模拟移民和居民。
Migratory bird populations frequently consist of individuals that overwinter variable distances from the breeding site. Seasonal changes in photoperiod, which varies with latitude, underlie seasonal changes in singing frequency in birds. Therefore, migratory populations that consist of individuals that overwinter at different latitudes with large overwintering ranges could experience within‐population variation in seasonal production of song. To test the influence of overwintering latitude on intrapopulation variance in song production in the spring, we subjected two groups of Eastern Song Sparrows (Melospiza melodia melodia) from the same partially migratory breeding population to different photoperiodic schedules associated with a 1,300‐km difference in overwintering location. One group remained on the natural photoperiodic schedule of the breeding site (resident group) while the other group experienced a nonbreeding photoperiod that mimicked a southern migration in the fall followed by a northern migration back to the breeding site in the spring (migratory group). We compared song output between the two groups in three different stages (nonbreeding, prebreeding, and breeding). Little singing occurred during nonbreeding stage sample dates (20 November, 6 December) for the resident group, and no singing occurred for the migrant group. During the prebreeding stage (27 January, 7 February), significantly more singing occurred in the resident group than in the migrant group. During the breeding stage (21 March, 4 April), after a simulated migration for the migrants, song output was similar in both groups. These results suggest that within‐population variation in wintering latitude may contribute to variation in seasonal changes in singing behavior, which may covary with readiness to breed. Studies utilizing confirmed migrants and residents, rather than merely simulated migrants and residents, are also needed to better understand these processes.
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