Characterizing the spatial distribution of δ¹⁸O in seawater and δ¹⁵N and δ¹³C in marine particulate organic matter pools can be useful in identifying isotopic discriminators of major water masses and serve as a baseline for food web and other ecological studies. Nevertheless, we do not know how isoscapes of δ¹⁸O, δ¹⁵N and δ¹³C are distributed and interact with mesoscale (10–100 km) physical oceanographic features for large parts of the global ocean. Here samples and measurements were collected during research cruises in the austral summer of 2017/18 and 2018/19 along the east coast of the South Island of New Zealand. The physical structure of the water column, δ¹⁸O of seawater, and δ¹⁵N and δ¹³C of suspended particulate organic matter were analyzed. Interannual differences in inferred circulation, oceanographic features, and the interaction of Subtropical and Subantarctic water masses in the study area were described. The relationships between nutrient concentrations, physical oceanographic variables and δ¹⁸O, δ¹⁵N and δ¹³C isoscapes were investigated by running linear models with all combination of variables, then averaging the most parsimonious ones that best fit the data. Results demonstrate that different environments along the east coast are connected via northward transport of Subtropical Water near the surface and Subantarctic Mode Water at depth (220–500 m). The northward transport of modified STW was associated with nutrient inputs and deepening of the maximum fluorescence depth. The spatial distribution of isotopic values had minimal temporal variability and was primarily linked to patterns of nutrient input (δ¹⁵N), coastal productivity (δ¹³C) and water mass type (δ¹⁸O). δ¹⁵N values demonstrated significant spatial variation, while δ¹⁸O displayed distinct values among depths. The present study was the first to resolve the distribution of δ¹⁵N and δ¹³C isotopes at a regional scale along the east coast of the South Island of New Zealand, δ¹⁸O in New Zealand waters, and to investigate the extent to which these distributions were influenced by patterns in physical oceanography. Average values of δ¹⁸O, δ¹⁵N and δ¹³C for different fishery management areas and depths are presented to support future ecological studies along Southeast New Zealand.

表征的空间分布δ ¹⁸ ○在海水和δ ¹⁵ N和δ ¹³在海洋粒状有机物池C可识别主要水团的同位素鉴别有用并作为食物网等生态研究的基线。尽管如此，我们不知道怎么的isoscapes δ ¹⁸ O，δ ¹⁵ N和δ ¹³C分布并与全球大部分海洋的中尺度（10-100 km）物理海洋学特征相互作用。在2017/18和2018/19南方夏季沿新西兰南岛东海岸的研究航行期间，这里收集了样品和测量值。水柱的物理结构，δ ¹⁸海水的O，和δ ¹⁵ N和δ ¹³的悬浮粒状有机物C下进行分析。描述了研究区域推断环流，海洋学特征以及亚热带和亚南极水团相互作用的年际差异。养分含量，物理海洋学变量之间的关系δ ¹⁸O，δ ¹⁵ N和δ ¹³通过运行线性模型与变量的所有组合，进行平均，最节俭那些最适合数据C isoscapes进行了调查。结果表明，东海岸的不同环境通过近地表水和220到500 m深度的亚南极模式水的北向输送而连接起来。改良STW的向北运输与养分输入和最大荧光深度的加深有关。同位素值的空间分布具有最小时间变化，并主要与养分输入的模式（δ ¹⁵ N），沿海生产力（δ ¹³ C）和水的质量类型（δ ¹⁸ O）。δ ¹⁵的N个值表明显著空间变化，而δ ¹⁸ ö显示深度中不同的值。本研究是第一个要解决的分布δ ¹⁵ N和δ ¹³ C ^同位素沿着新西兰南岛东海岸地区范围内，δ ¹⁸在新西兰海域O，并探讨在多大程度上这些分布受到物理海洋学模式的影响。的平均值δ ¹⁸ O，δ ¹⁵ N和δ ¹³介绍了不同渔业管理区域和深度的碳，以支持新西兰东南部地区未来的生态研究。