Seabirds in cold biomes sometimes aggregate near glacier fronts and at sea-ice edges to forage. In this note, we report on large aggregations of black guillemots (Cepphus grylle) at the edge of sea ice in front of the tidewater glacier Kongsbreen (Kongsfjorden, Svalbard). During several days in the second half of June 2011, we observed 49–155 individuals of black guillemots at this ice edge. They foraged actively, and many of the dives were directed underneath the sea ice. The outflow of glacial meltwater and resulting upwelling generated opportunities for the black guillemots to feed, likely on zooplankton or fish. The black guillemots used the sea ice as a resting platform between dives or diving sessions, and whilst on the ice, they interacted socially. On our last visit, the sea ice was gone, and the black guillemots had left the bay. At the neighbouring tidewater glacier Kronebreen, there was no sea ice connected to the glacier. Surface-feeding seabirds, particularly black-legged kittiwakes (Rissa tridactyla), were numerous at the plumes generated by meltwater from Kronebreen. Black guillemots were not seen at these plumes, but some individuals were seen scattered in the fjord system. Our observations add to the natural history of black guillemots and enhance our knowledge of ecological interactions and seabird habitat use shaped by tidewater glaciers.

寒冷生物群落中的海鸟有时会聚集在冰川前沿和海冰边缘附近觅食。在这篇笔记中，我们报告了黑海鸠 ( Cepphus grylle ) 的大型聚集体) 在潮水冰川 Kongsbreen (Kongsfjorden, Svalbard) 前的海冰边缘。在 2011 年 6 月下半月的几天里，我们在这个冰缘观察到了 49-155 只黑海鸠。他们积极觅食，许多潜水都是在海冰下进行的。冰川融水的流出和由此产生的上升流为黑海鸠提供了觅食的机会，可能以浮游动物或鱼类为食。黑海鸥利用海冰作为潜水或潜水课程之间的休息平台，在冰上时，它们进行社交互动。在我们上次访问时，海冰已经消失，黑海鸠也离开了海湾。在邻近的潮水冰川 Kronebreen，没有与冰川相连的海冰。在水面觅食的海鸟，尤其是黑腿三趾鸥（Rissa tridactyla )，在 Kronebreen 的融水产生的羽流中数量众多。在这些羽状物中没有看到黑色海鸥，但看到一些个体散布在峡湾系统中。我们的观察增加了黑海鸠的自然历史，增强了我们对潮水冰川形成的生态相互作用和海鸟栖息地利用的了解。