Individual consistency in migration strategies of a tropical seabird, the Round Island petrel.
Individual consistency in migration strategies of a tropical seabird, the Round Island petrel.
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DOI：
10.1186/s40462-022-00311-y
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发表时间：
2022-03-14
期刊：
影响因子：
4.1
通讯作者：
Nicoll MAC
中科院分区：
文献类型：
--
作者：
Franklin KA;Norris K;Gill JA;Ratcliffe N;Bonnet-Lebrun AS;Butler SJ;Cole NC;Jones CG;Lisovski S;Ruhomaun K;Tatayah V;Nicoll MAC
在迁徙物种中，迁徙策略的个体内部和个体之间的差异程度可以影响对环境变化的潜在反应速度和方向。量化这种变化需要在重复的迁徙旅程中跟踪许多个体。在温带和高纬度地区，迁徙行为的个体内部差异较低是常见的，这可能反映出在这些季节性结构的环境中重复使用可预测的资源。然而，热带地区的迁徙行为的变化仍然很大程度上未知，因为热带地区食物资源的季节性可预测性可能较弱。圆岛海燕 (Pterodroma sp.) 是热带中上层海鸟，全年繁殖并进行长距离迁徙。使用 2009 年至 2018 年间 62 个个体的多年地理定位器跟踪数据，我们量化了个体内部和个体之间非繁殖分布和时间的变异水平。我们发现个体之间的海上运动和时间存在显着的差异，印度洋大部分地区全年都会发生向不同地区的非繁殖性迁徙。尽管如此，对海燕个体的重复追踪揭示了个体内部迁徙行为的空间和时间一致性非常高，特别是对于在不同年份在相似时间离开的海燕以及在南方夏季离开的海燕。然而，虽然同一区域被不同年份的个体使用，但在非繁殖期并不一定在同一时间使用。即使在迁徙路线和时间范围广泛的热带系统中，我们的结果也表明个体迁徙行为一致性的好处。确定驱动和维持个体间迁徙行为差异的因素，以及对繁殖成功和生存的影响，将是了解整个迁徙范围内环境变化后果的关键。在线版本包含可在 10.1186/s40462-022-00311-y 获取的补充材料。
In migratory species, the extent of within- and between-individual variation in migratory strategies can influence potential rates and directions of responses to environmental changes. Quantifying this variation requires tracking of many individuals on repeated migratory journeys. At temperate and higher latitudes, low levels of within-individual variation in migratory behaviours are common and may reflect repeated use of predictable resources in these seasonally-structured environments. However, variation in migratory behaviours in the tropics, where seasonal predictability of food resources can be weaker, remains largely unknown. Round Island petrels (Pterodroma sp.) are tropical, pelagic seabirds that breed all year round and perform long-distance migrations. Using multi-year geolocator tracking data from 62 individuals between 2009 and 2018, we quantify levels of within- and between-individual variation in non-breeding distributions and timings. We found striking levels of between-individual variation in at-sea movements and timings, with non-breeding migrations to different areas occurring across much of the Indian Ocean and throughout the whole year. Despite this, repeat-tracking of individual petrels revealed remarkably high levels of spatial and temporal consistency in within-individual migratory behaviour, particularly for petrels that departed at similar times in different years and for those departing in the austral summer. However, while the same areas were used by individuals in different years, they were not necessarily used at the same times during the non-breeding period. Even in tropical systems with huge ranges of migratory routes and timings, our results suggest benefits of consistency in individual migratory behaviours. Identifying the factors that drive and maintain between-individual variation in migratory behaviour, and the consequences for breeding success and survival, will be key to understanding the consequences of environmental change across migratory ranges. The online version contains supplementary material available at 10.1186/s40462-022-00311-y.
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