Data from: Environmental drivers of population-level variation in the migratory and diving ontogeny of an Arctic top predator

The development of migratory strategies that enable juveniles to survive to recruitment is critical for species that exploit seasonal niches. For animals that forage via breath-hold diving this requires a combination of both physiological and foraging skill development. Here, we assess how migratory and dive behaviour develop over the first months of life for a migratory Arctic top predator, the harp seal, tracked using animal-borne satellite relay data loggers. We reveal similarities in migratory movements and differences in diving behaviour between juveniles from breeding populations in the Northwest Atlantic and Greenland Sea. In both regions, periods of resident and transient behaviour during migration were associated with proxies for food availability; sea ice concentration and water depth. However, while ontogenetic development of dive behaviour was similar for both groups of juveniles over the first 25 days, after this time Greenland Sea animals performed shorter and shallower dives and were more closely associated with sea ice than Northwest Atlantic animals. Together, these results highlight the role of both intrinsic and extrinsic factors in shaping early-life behaviour. Differences in the environmental conditions experienced during early-life may shape how populations respond to the rapid changes occurring in the Arctic ocean ecosystem.

Usage Notes
This datafile contains the movement and dive data used by Grecian et al. to examine the drivers of variation in the migratory and diving ontogeny of juvenile harp seals.

The 'dive_summaries.csv' file contains 6 hour summary data transmitted by SMRU satellite relay data loggers.
The 'individual_dives.csv' file contains the individual dive metrics transmitted by SMRU satellite relay data loggers.
The 'move_persistence.csv' file contains the movement paths of 22 animals equiped with either SMRU satellite relay data loggers or Wildlife Computer SPOT or SPLASH tags. These paths have been regularised to 12 hour time steps using a continous-time state space model.

For details of the regularisation procedure see: Jonsen, I.D., Patterson, T.A., Costa, D.P. et al. A continuous-time state-space model for rapid quality control of argos locations from animal-borne tags. Mov Ecol 8, 31 (2020). https://doi.org/10.1186/s40462-020-00217-7
For details of the SMRU dive data see: http://www.smru.st-andrews.ac.uk/protected/specs/DatabaseFieldDescriptions.pdf
R code to analyse these data are supplied on GitHub here:

对于依赖季节性生态位生存的物种而言，发展能够使幼体存活至繁殖期的迁徙策略至关重要。对于通过屏气潜水觅食的动物而言，这需要生理能力和觅食技能的双重发展。在本研究中，我们评估了迁徙和潜水行为在生命初期几个月内的发展情况，研究对象为迁徙北极顶级掠食者——斑海豹，我们通过搭载动物携式卫星中继数据记录器的追踪数据进行了研究。我们发现，西北大西洋和格陵兰海繁殖群体中的幼体在迁徙运动中存在相似之处，但在潜水行为上存在差异。在两个区域，迁徙过程中的定居和暂留行为都与食物可用性的代理指标相关，包括海冰浓度和水深。然而，尽管两组幼体在前25天内的潜水行为发育过程相似，但在此之后，格陵兰海的动物进行了更短、更浅的潜水，并且与海冰的联系比西北大西洋的动物更为紧密。这些结果共同突显了内在和外在因素在塑造早期生命行为中的角色。在早期生命阶段所经历的环境条件差异可能塑造了种群对北极海洋生态系统快速变化的响应方式。

使用说明
本数据文件包含了Grecian等人用于研究幼年斑海豹迁徙和潜水发育变异驱动力的运动和潜水数据。

'dive_summaries.csv'文件包含由SMRU卫星中继数据记录器传输的6小时汇总数据。
'individual_dives.csv'文件包含由SMRU卫星中继数据记录器传输的个体潜水指标。
'move_persistence.csv'文件包含22只动物的运动路径，这些动物配备有SMRU卫星中继数据记录器或Wildlife Computer SPOT或SPLASH标签。这些路径已使用连续时间状态空间模型进行了规范化，以12小时的时间步长进行。
有关规范化程序的详细说明，请参阅：Jonsen, I.D.，Patterson, T.A.，Costa, D.P. 等. 一种用于从动物携式标签中快速质量控制Argos位置的连续时间状态空间模型. 运动生态学8, 31 (2020). https://doi.org/10.1186/s40462-020-00217-7
有关SMRU潜水数据的详细信息，请参阅：http://www.smru.st-andrews.ac.uk/protected/specs/DatabaseFieldDescriptions.pdf
用于分析这些数据的R代码在GitHub上提供，链接如下：