The distribution and transport of paralarvae of the complex Sthenoteuthis oualaniensis - Dosidicus gigas (SD complex, Cephalopoda: Ommastrephidae) in the tropical-subtropical convergence off Mexico were analyzed under contrasting interannual environmental conditions. Two El Niño years were sampled (2010 and 2016), in which the SST were up to 3 °C above the average throughout the study area, while during La Niña year (2012) the SST anomalies were up to 2 °C below the average. During El Niño years, a relative shallow thermocline (<60 m depth) was detected around Cabo Corrientes, where the paralarvae were found with mean abundance of 2 org 1000 m⁻³. During La Niña condition, a shallower thermocline was detected in the entrance of the Gulf of California (~20 m depth) and the paralarvae abundance rose to 84 org 1000 m⁻³ with high frequency of occurrence. In both El Niño and La Niña conditions the paralarvae were mainly found in the strongly stratified waters (>80 cycles h⁻¹). In addition, a simple dispersion Lagrangian model based on observed satellite geostrophic currents, suggested association of the SD complex paralarvae with mesoscale structures, in which the eggs and hatched paralarvae had an appropriate habitat for a nursery, retaining the paralarvae until their recruitment in a ~100 km radius. But during warm extreme events, with less mesoscale activity, the paralarvae could be transported as far as 500 km southeast of the spawning zone. Even though the interannual ENSO conditions modulate the magnitude of the paralarvae abundance, the shallow and well developed thermocline could help paralarvae to increase their survival chances, while mesoscale activity retains them near the productive coastal waters.

在一年一度的年际环境条件下，分析了墨西哥热带-亚热带辐合中Sualnoteuthis oualaniensis-Dosidicus gigas（SD复合体，Cephalopoda：Ommastrephidae）复合体的幼虫的分布和运输。采样了两个厄尔尼诺年（2010年和2016年），其中整个研究区的SST均值比平均值高3°C，而在LaNiña年（2012年）中，SST异常值比平均值低2°C。 。在厄尔尼诺现象期间，在科波连特斯附近发现了一个相对较浅的温跃层（<60 m深度），在该处发现了寄生虫的平均丰度为2 org 1000 m ^-3。在拉尼娜条件下，在加利福尼亚湾的入口（约20 m深度）发现了一个较浅的温跃层，且其寄生虫的出现频率上升至84 org 1000 m ^-3。在厄尔尼诺和拉尼娜条件下，幼虫主要在强分层水域中发现（> 80个循环h ^-1）。此外，基于观测到的卫星地转流的简单弥散拉格朗日模型表明，SD复杂的幼虫与中尺度结构相关联，其中卵和孵化的幼虫具有适合苗圃的栖息地，保留了该幼虫直到它们被募集到〜半径100公里。但是在温暖的极端事件中，中尺度活动较少，寄生虫可以被运送到产卵区东南方500公里处。即使年际ENSO条件调节了幼虫的丰度，浅而发达的温跃层也可以帮助幼虫增加其生存机会，而中尺度活动将它们保留在生产性沿海水域附近。