Sympatrically-breeding congeneric seabirds (Stercorarius spp.) from Arctic Canada migrate to four oceans

Polar systems of avian migration remain unpredictable. For seabirds nesting in the Nearctic, it is often difficult to predict which of the world’s oceans birds will migrate to after breeding. Here we report on three related seabird species that migrated across four oceans following sympatric breeding at a central Canadian high Arctic nesting location. Using telemetry we tracked pomarine jaeger (Stercorarius pomarinus, n=1) to the Arctic Ocean to the western Pacific Ocean; parasitic jaeger (S. parasiticus, n=4) to the western Atlantic Ocean, and long-tailed jaeger (S. longicaudus, n=2) to the eastern Atlantic Ocean and western Indian Ocean. We also report on extensive nomadic movements over ocean during the post-breeding period (19,002 km) and over land and ocean during the pre-breeding period (5,578 km) by pomarine jaeger, an irruptive species whose full migrations and nomadic behavior have been a mystery. While the small sample sizes in our study limit the ability to make generalizable...

极地鸟类迁徙系统仍具有不可预测性。对于在新北极区（Nearctic）繁殖的海鸟而言，其繁殖后将迁徙至全球哪片海域，通常难以预判。本研究针对在加拿大中部高北极区域同域繁殖的3种近缘海鸟展开报道，这些鸟类繁殖后会跨四大洋进行迁徙。借助生物遥测（telemetry）技术，我们追踪到：中贼鸥（*Stercorarius pomarinus*，n=1）的迁徙路径覆盖北冰洋至西太平洋；寄生贼鸥（*Stercorarius parasiticus*，n=4）前往西大西洋；长尾贼鸥（*Stercorarius longicaudus*，n=2）则迁徙至东大西洋及西印度洋。此外，我们还记录了中贼鸥——一种其完整迁徙模式与漂泊行为长期成谜的漂泊性物种——的移动情况：繁殖后阶段其在大洋上的大范围漂泊行程达19002公里，繁殖前阶段其在陆地与大洋间的移动行程达5578公里。尽管本研究样本量较小，限制了得出普适性结论的能力……