Large submarine plateaus impede the eastward flow of the deep‐reaching Antarctic Circumpolar Current (ACC), and at the southern Kerguelen Plateau (SKP), the ACC flow is steered north through the Fawn Trough and south through the Princess Elizabeth Trough. During the Kerguelen Axis study, a regional‐scale ecosystem survey, oceanographic sampling showed the ACC water properties west of the SKP to be distinct from those over the SKP. Electrona antarctica, a dominant mesopelagic fish species, is associated with Circumpolar Deep Water transported by the ACC, and modified versions that occur over and downstream from the SKP including along the Antarctic continental slope. Here, otolith chemistry from samples of E. antarctica collected during the survey were used to test a biophysical hypothesis predicting structuring and movement between populations along zonal flow in the ACC. In chemistry deposited during early life in the otolith nuclei, the relationship between MgCa−1 and SrCa−1 showed complete separation between fish collected over the SKP and within the ACC proper, indicating population differentiation. Chemistry from the otolith edges, deposited during the period leading up to capture, showed significantly higher concentrations of MgCa−1 over the SKP, likely related to differences in feeding and reproduction. Fish with nucleus chemistry characteristic of the SKP were also found in samples caught further east, suggesting they were transported along the ACC downstream, and southward toward the Antarctic continent within the Australian–Antarctic Gyre.

中文翻译：

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Electrona antarctica 的耳石化学表明一个潜在的种群标记将南凯尔盖朗高原与向东流动的南极环极流区分开来

大型海底高原阻碍了深入南极环极流 (ACC) 的东流，在凯尔盖朗高原 (SKP) 南部，ACC 流向北穿过小鹿海槽，向南穿过伊丽莎白公主海槽。在 Kerguelen Axis 研究（区域尺度生态系统调查）期间，海洋采样显示 SKP 以西的 ACC 水特性与 SKP 上的水特性不同。Electrona antarctica 是一种主要的中深层鱼类，与 ACC 运输的环极深水有关，以及发生在 SKP 上空和下游的修改版本，包括沿南极大陆坡。在这里，来自大肠杆菌样本的耳石化学。调查期间收集的南极洲用于测试生物物理假设，该假设预测沿 ACC 中带状流的种群之间的结构和运动。在生命早期在耳石核中沉积的化学物质中，MgCa-1 和 SrCa-1 之间的关系显示在 SKP 和 ACC 内部收集的鱼之间完全分离，表明种群分化。来自耳石边缘的化学物质，在捕获前的时期沉积，显示出 SKP 上 MgCa-1 的浓度显着更高，这可能与摄食和繁殖的差异有关。在进一步向东捕获的样本中也发现了具有 SKP 核化学特征的鱼，这表明它们是沿着 ACC 向下游运输，并在澳大利亚 - 南极环流内向南向南极大陆运输。