Harbor seals (Phoca vitulina) were formerly widely distributed in Greenland, but in most areas, they have now become rare or extinct. In this study, we deployed 15 satellite-linked data-recorders on 12 individual harbor seals captured near the southern tip of Greenland. The tagging site, a small archipelago, turned out to be their main haul-out and molting location. The seals were tagged around the first week of September across 2 years. Six adult seals transmitted during the breeding season (June–July), during which two males and a female stayed near the tagging site, whereas two females and a male made a targeted swim about 250 km northward along the east coast, just prior to parturition and they returned right after the breeding period. Based on behavior (strong site fidelity and abrupt changes in haul-out and diving activities), we determined that all three females gave birth and that parturition happened during 14–21 June. Prolonged haul-out, relating to the molt, started in early August and peaked during 15 August–8 September with an average of 10–11 h haul-out per day. The seals thereafter gradually transitioned toward a winter mode with more deep dives and on average hauling out 4 h every other day. Dives deeper than 400 m made up less than 1% of their dives, but four seals dove to depths in excess of 575 m, with a record depth of 631 m and the longest dives lasting between 20 and 25 min. To our knowledge, these dives are the deepest recorded for harbor seals.

中文翻译：

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格陵兰南部的深潜港海豹（Phoca vitulina）：遥测描述的运动、潜水、拖出和繁殖活动

斑海豹（Phoca vitulina）以前广泛分布于格陵兰岛，但在大多数地区，它们现在已变得稀有或灭绝。在这项研究中，我们在格陵兰岛南端附近捕获的 12 只海豹个体上部署了 15 台卫星数据记录仪。标记地点，一个小群岛，原来是他们的主要牵引和蜕皮地点。这些海豹在 9 月的第一周左右被标记了 2 年。6 只成年海豹在繁殖季节（6 月至 7 月）传播，在此期间，两只雄性和一只雌性留在标记地点附近，而两只雌性和一只雄性在分娩前沿着东海岸向北约 250 公里有针对性地游泳他们在繁殖期后立即返回。基于行为（强烈的现场保真度以及拖运和潜水活动的突然变化），我们确定所有三名女性都分娩了，并且分娩发生在 6 月 14 日至 21 日。与蜕皮有关的长时间拖运始于 8 月初，并在 8 月 15 日至 9 月 8 日期间达到顶峰，平均每天拖运 10-11 小时。此后，海豹逐渐过渡到冬季模式，进行更深的潜水，平均每隔一天拖出 4 小时。深度超过 400 m 的潜水占他们潜水的不到 1%，但有四只海豹潜入超过 575 m 的深度，创纪录的深度为 631 m，最长的潜水持续时间在 20 到 25 分钟之间。据我们所知，这些潜水是有记录的海豹最深的潜水。8 月初开始，在 8 月 15 日至 9 月 8 日达到顶峰，平均每天拖运 10 至 11 小时。此后，海豹逐渐过渡到冬季模式，进行更深的潜水，平均每隔一天拖出 4 小时。深度超过 400 m 的潜水占他们潜水的不到 1%，但有四只海豹潜入超过 575 m 的深度，创纪录的深度为 631 m，最长的潜水持续时间在 20 到 25 分钟之间。据我们所知，这些潜水是有记录的海豹最深的潜水。8 月初开始，8 月 15 日至 9 月 8 日达到顶峰，平均每天拖运 10 至 11 小时。此后，海豹逐渐过渡到冬季模式，进行更深的潜水，平均每隔一天拖出 4 小时。深度超过 400 m 的潜水占他们潜水的不到 1%，但有四只海豹潜入超过 575 m 的深度，创纪录的深度为 631 m，最长的潜水持续时间在 20 到 25 分钟之间。据我们所知，这些潜水是有记录的海豹最深的潜水。