Abstract Copepod species assemblage and biomass were studied during a weekly time series done during an anomalously warm and low sea surface Chlorophyll-a concentration period 2014–2015, compared with 2002–2018, at Cabo Pulmo National Park, Gulf of California, Mexico. Forty-nine copepod species accounted for 64% of the total zooplankton abundance. Three small copepods (Oncaea venusta 12.6%, Paracalanus parvus 11.5%, Clausocalanus jobei 8.6%) out of 45 species numerically dominated during 2014. The large copepods Subeucalanus subtenuis and Subeucalanus subcrassus out of 38 species recorded during 2015 increased in abundance accounting for 69% of copepod Carbon biomass. A Canonical Correspondence Analysis demonstrated SST drove copepod species assemblages. Copepod abundance was significantly higher during the cold (Nov–May) that during the warm (Jun–Oct) season and lower during Jan–Aug 2014 regional heatwave than during the Equatorial El Nino (Nov 2014–Dec 2015). Acartia tonsa was the only significant species indicator during the 2014 regional heatwave and Clausocalanus furcatus, Copilia mirabilis, and Cosmocalanus darwinii were significant species indicators of El Nino 2015. Copepod species assemblage had 87% tropical species during the Jan–Aug 2014 due to the regional heatwave that started the tropicalization of copepod community increasing to 95% of tropical species during El Nino 2015.

中文翻译：

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2014-2015 年加利福尼亚湾南部两个不同起源的异常温暖时期的桡足类物种组合和碳生物量

摘要 在墨西哥加利福尼亚湾的 Cabo Pulmo 国家公园，2014-2015 年与 2002-2018 年相比，在异常温暖和低海面叶绿素 a 浓度期间进行的每周时间序列研究了桡足类物种组合和生物量。49 种桡足类动物占浮游动物总丰度的 64%。2014 年 45 个物种中的 3 个小型桡足类（Oncaea venusta 12.6%，Paracalanus parvus 11.5%，Clausocalanus jobei 8.6%）在 2014 年期间数量上占主导地位。在 38569 个物种中，大型桡足类 Subeucalanus subtenuis 和 Subeucalanus subcrassus 增加了 2%桡足类碳生物量。规范对应分析表明 SST 驱动桡足类物种组合。桡足类丰度在寒冷季节（11 月至 5 月）明显高于暖季（6 月至 10 月），而在 2014 年 1 月至 8 月区域热浪期间，桡足类丰度低于赤道厄尔尼诺现象（2014 年 11 月至 2015 年 12 月）。在 2014 年区域性热浪期间，Acartiatonsa 是唯一重要的物种指标，而 Clausocalanus furcatus、Copilia mirabilis 和 Cosmocalanus darwinii 是 2015 年厄尔尼诺现象的重要物种指标。 2014 年 1 月至 8 月期间，桡足类物种组合中有 87% 的热带物种。在 2015 年厄尔尼诺现象期间，开始桡足类群落热带化的热浪增加到 95% 的热带物种。