Pan-Arctic Depth Distribution of Diapausing Calanus Copepods
Pan-Arctic Depth Distribution of Diapausing Calanus Copepods
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DOI：
10.1086/704694
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发表时间：
2019-10-01
影响因子：
1.6
通讯作者：
Ji, Rubao
中科院分区：
文献类型：
--
作者：
Kvile, Kristina Oie;Ashjian, Carin;Ji, Rubao
深度滞育被认为是哲水蚤生命周期的一个组成部分，但很少有研究集中在北极物种冰川哲水蚤和哲水蚤hyperboreus。通过对多个来源的泛北极地区大量观测数据的分析，我们发现北极哲水蚤在冬季具有较宽的深度分布，表明深度滞育是一种兼性策略。这两个物种的垂直分布在冬季趋于加深，并随着底部深度的增加而更深更广，而个体则聚集在更靠近海底的浅水区。这些结果表明，北极哲水蚤物种追求一个相对较深的滞育栖息地，但在地形上被封锁的货架上。滞育期间的深度分布的种间差异表明捕食的重要性。最大的C。Hyperboreus的滞育深度比C.冰川，可能是为了减轻捕食压力或由于表面附近的捕食损失。此外，C. hyperboreus在冬季与纬度呈负相关，表明在捕食压力较低的北冰洋中部滞育种群的浅水。我们的研究结果表明，北极哲水蚤复杂的滞育行为，与我们的观点的物种在北极生态系统中的作用的影响。
Diapause at depth is considered an integral part of the life cycle of Calanus copepods, but few studies have focused on the Arctic species Calanus glacialis and Calanus hyperboreus. By analyzing a large set of pan-arctic observational data compiled from multiple sources, we show that Arctic Calanus has a broad depth distribution in winter, indicating that diapause at depth is a facultative strategy. Both species' vertical distributions tend to deepen in winter and to be deeper and broader with increasing bottom depth, while individuals are aggregated closer to the sea floor in shallow areas. These results indicate that Arctic Calanus species pursue a relatively deep diapause habitat but are topographically blocked on the shelves. Interspecific differences in depth distribution during diapause suggest the importance of predation. The larger C. hyperboreus has a deeper diapause depth than C. glacialis, potentially to alleviate predation pressure or as a result of predation loss near the surface. Moreover, the mean depth of C. hyperboreus in winter is negatively associated with latitude, indicating a shoaling of the diapause population in the central Arctic Ocean where predation pressure is lower. Our results suggest a complex diapause behavior by Arctic Calanus, with implications for our view of the species' roles in Arctic ecosystems.