Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic
Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic
复制标题
越冬海冰特征对于西南大西洋南极磷虾补充很重要
DOI：
10.1016/j.ecolind.2021.107934
复制
发表时间：
2021
影响因子：
6.9
通讯作者：
Corney Stuart
中科院分区：
文献类型：
--
作者：
Veytia Devi;Bestley Sophie;Kawaguchi So;Meiners Klaus M.;Murphy Eugene J.;Fraser Alexander D.;Kusahara Kazuya;Kimura Noriaki;Corney Stuart
气候变化改变了海冰环境的范围和结构，从而影响到它们作为极地物种栖息地的功能。查明海冰的特性，作为生境质量的指标，对于监测和管理气候变化的影响至关重要。在南大洋，南极磷虾是一种重要的被捕食物种和渔业目标。磷虾幼虫依靠海冰栖息地度过冬季，并在春季补充到种群中。现有的观测海冰的特点缺乏足够的时空覆盖面，以量化哪些有助于有利的越冬栖息地，导致不确定性如何在海冰目前和未来的变化影响磷虾种群。在这里，我们得到了跨35年的西南大西洋的年度磷虾招聘的区域规模的指数。为了开发有意义的海冰栖息地指标，我们从高分辨率海冰模型中选择了假设与幼虫栖息地使用相关的变量。由此产生的招聘和海冰指标之间的相关性因地区而异，并显示与海冰的远程连接，符合既定的理论幼虫运输。通过改进的海冰栖息地质量的代表性，相比使用更传统的卫星衍生的变量，如海冰的范围和持续时间，我们突出了越冬栖息地的合理区域。我们的研究结果提高了目前对磷虾可能如何应对海冰变化的理解，并支持了新出现的观点，即幼虫栖息地的利用是复杂的。此外，区域变化的幼体依赖海冰可能提供口袋的弹性变化的更广泛的磷虾种群。
Climate change alters the extent and structure of sea-ice environments, which affects how they function as a habitat for polar species. Identifying sea-ice characteristics that serve as indicators of habitat quality will be crucial to the monitoring and management of climate change impacts. In the Southern Ocean, Antarctic krill is a key prey species and fishery target. Krill larvae depend upon sea-ice habitats to survive the winter and recruit to the population in spring. Existing observations of sea-ice characteristics lack sufficient spatiotemporal coverage to quantify which ones contribute to favourable overwintering habitat, leading to uncertainties in how current and future changes in sea ice affect krill populations. Here, we derive regional-scale indices of annual krill recruitment spanning 35 years across the southwest Atlantic. To develop meaningful indicators of sea-ice habitat, we selected variables from a high-resolution sea-ice model that are hypothesized as relevant for larval habitat use. The resulting correlations between recruitment and sea-ice indicators vary by region and show remote connections to sea ice that correspond with established theories of larval transport. Through an improved representation of sea-ice habitat quality, as compared with using more traditional satellite-derived variables such as sea-ice extent and duration, we highlight plausible regions of overwintering habitat. Our findings improve current understanding of how krill are likely responding to changing sea ice and support emerging views that larval habitat use is complex. Furthermore, regional variation in larval dependence on sea ice may provide pockets of resilience to change for the broader krill population.