ABSTRACT: Atlantids are holoplanktonic gastropods present in tropical to sub-polar waters, and have gained an increasing interest due to their potential use as biological indicators of climate change and ocean acidification. However, there is a lack of information regarding their distribution for large areas of some oceans, particularly in the California Current System (CCS), which has been used as a model for many acidification studies and where intense warming events occur. The distribution patterns of 18 species of Atlantidae off the west coast of the Baja California Peninsula, Mexico, representing 90% of the atlantid species registered for the Pacific Ocean, were analyzed during a period of warm anomalies associated with the El Niño of 2015-2016 and the 2014-2016 marine heat wave (MHW). The species distribution showed 3 groups: 2 in the north (coastal and oceanic) and 1 in the south. The limit of distribution between these 3 groups was found in the vicinity of Punta Eugenia (PE). The southernmost community of atlantids was characterized by tropical and subtropical species that were transported northward due to coastal advection of warm waters associated with the El Niño of 2015-2016. North of PE, the warm-water affinity oceanic species Atlanta rosea and A. fragilis were found, evidencing the entrance of water from the Central Pacific related to MHW which affected the oceanic region off the coast of PE. The response of the distribution patterns proves that atlantids can be used as biological indicators, as they reflect the effect of environmental anomalies in the southern CCS.

中文翻译：

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在南加州现行系统的一次厄尔尼诺事件期间（2015年夏秋季），亚特兰科物种（天足类：翼龙类）的分布

摘要：Atlantids是存在于热带至亚极水域的全浮游类腹足纲动物，由于其潜在用途作为气候变化和海洋酸化的生物学指标，因此受到越来越多的关注。但是，缺乏有关它们在某些海洋大区域的分布的信息，尤其是在加利福尼亚洋流系统（CCS）中，该系统已被用作许多酸化研究和发生强烈变暖事件的模型。在2015-2016年与厄尔尼诺现象相关的暖异常时期，分析了墨西哥下加利福尼亚半岛西海岸外的18种亚特兰科的分布模式，占太平洋已注册亚特兰大物种的90％ 2014-2016年海洋热浪（MHW）。物种分布显示3组：北部2个（沿海和海洋），南部1个。这三组之间的分布极限是在蓬塔尤金尼亚（PE）附近发现的。最南端的atlantids社区以热带和亚热带物种为特征，这些物种由于与2015-2016年厄尔尼诺现象相关的温水沿海岸平流而向北迁移。PE北部，温水亲和性海洋物种发现亚特兰大玫瑰花和脆弱的A.，证明与MHW有关的来自中太平洋的水进入，影响了PE沿海的海洋区域。分布模式的响应证明，atlantids可以用作生物学指标，因为它们反映了CCS南部地区环境异常的影响。