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. 2019 Mar 26;9:5221. doi: 10.1038/s41598-019-41635-x

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Based on individual sightings, adult female Weddell seals were assigned a phenology category for three life history events: reproduction in Year 1, moulting in Year 1, and reproduction in Year 2. Early, mid, and late correspond to the distribution 0–25%ile, 25–75%ile, and 75–100%ile, respectively; Non-Parturient had previously pupped but were not parturient in a given year; and Non-Attendant had been seen during the Year 1 pupping and moulting season but were not seen during the Year 2 pupping season.