Seasonal detections of bearded seal (Erignathus barbatus) vocalizations in Baffin Bay and Davis Strait in relation to sea ice concentration
Seasonal detections of bearded seal (Erignathus barbatus) vocalizations in Baffin Bay and Davis Strait in relation to sea ice concentration
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DOI：
10.1007/s00300-020-02723-1
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发表时间：
2020-08-08
期刊：
影响因子：
1.7
通讯作者：
Stafford, Kathleen M.
中科院分区：
文献类型：
--
作者：
Boye, Tenna K.;Simon, Malene J.;Stafford, Kathleen M.
关于格陵兰胡须海豹（Erignathus barbatus）的生物学和季节性分布的信息有限。该物种与冰密切相关，依赖海冰拖出并分娩，这使其容易受到气候变化的影响。我们在西格陵兰岛巴芬湾南部和戴维斯海峡的七个不同地点调查了胡须海豹发声的季节性和分布。Aural M2和HARUphone记录仪于2006-2007年和2011-2013年部署在海底。研究人员分析了与位置（包括到海岸的距离和深度）、平均海冰浓度和dieel模式相关的有/没有胡须海豹叫声的记录。鸣叫声发生在11月至6月下旬，在所有地点的交配季节鸣叫声最强烈。深度和到海岸的距离对探测数量有明显的影响，格陵兰大陆架（< 300米）似乎是胡须海豹在交配季节的首选栖息地。这些结果表明，有胡须的海豹可能会在夏天随着海冰的消退而撤退到加拿大，或者可能会在西格陵兰海岸度过夏天。也有可能，由于有胡须的海豹声音行为的季节性变化，动物可能在夏天出现在我们的研究区域，但沉默。探测次数受海冰形成时间的影响，而不受海冰浓度的影响。日珥模式与北极其他地区发现的模式一致，峰值出现在清晨（当地时间0400），最低值出现在下午晚些时候（当地时间1600）。虽然在挪威、加拿大、格陵兰岛西北部和阿拉斯加地区对胡须海豹进行了发声研究，但这项研究填补了这些地区之间的空白。
There is limited information about the biology and seasonal distribution of bearded seals (Erignathus barbatus) in Greenland. The species is highly ice-associated and depends on sea ice for hauling out and giving birth, making it vulnerable to climate change. We investigated the seasonality and distribution of bearded seal vocalizations at seven different locations across southern Baffin Bay and Davis Strait, West Greenland. Aural M2 and HARUphone recorders were deployed on the sea bottom during 2006-2007 and 2011-2013. Recordings were analyzed for presence/absence of bearded seal calls relative to location (including distance to shore and depth), mean sea ice concentration and diel patterns. Calling occurred between November and late June with most intense calling during the mating season at all sites. There was a clear effect of depth and distance to shore on the number of detections, and the Greenland shelf (< 300 m) appeared to be the preferred habitat for bearded seals during the mating season. These results suggest that bearded seals may retreat with the receding sea ice to Canada during summer or possibly spend the summer along the West Greenland coast. It is also possible that, due to seasonal changes in bearded seal vocal behavior, animals may have been present in our study area in summer, but silent. The number of detections was affected by the timing of sea ice formation but not sea ice concentration. Diel patterns were consistent with patterns found in other parts of the Arctic, with a peak during early morning (0400 local) and a minimum during late afternoon (1600 local). While vocalization studies have been conducted on bearded seals in Norwegian, Canadian, northwest Greenland, and Alaskan territories, this study fills the gap between these areas.