Calanid copepods of the genera Calanus and Calanoides are key components of zooplankton communities in upwelling systems. Here, we compare the life-history traits of Calanus chilensis from the Humboldt Current Systems (HCS) off northern Peru and its counterpart Calanoides natalis from the northern Benguela Current System (BCS) off Namibia. A comprehensive data set of the distribution and abundance patterns of these species along extensive horizontal and vertical scales is presented. C. chilensis from the HCS was almost exclusively restricted to the surface layer (50–0 m) above the oxygen minimum zone (OMZ), whereas C. natalis from the BCS inhabited the entire water column down to 800 m performing ontogenetic vertical migration (OVM) through the OMZ. Resting stages of C. natalis at depth accumulated high amounts of lipid (30–60% of dry mass, DM), whereas C. chilensis did not rely on lipid reserves. These findings confirm that the life cycle of C. chilensis does not include OVM with diapause at depth. Surprisingly, the regional distribution of C. chilensis secondary production extended much further offshore (>200 km from the coast) than is typical of other coastal upwelling systems. Deviating environmental conditions forced the two key calanid species to develop specific, but different life strategies for HCS and BCS. Compacted biomass concentrations of C. chilensis in the surface layer from the shelf (≤3 g DM m⁻²) to offshore waters (≤1.5 g DM m⁻²) facilitate easy and efficient foraging by predators such as juvenile Peruvian anchovies. In contrast, a large fraction of the C. natalis biomass occurs within the OMZ and is thus out of reach for hypoxia-sensitive predators. Calanoid copepods (e.g. C. chilensis) play a crucial role as important prey for growth and recruitment of small pelagic fish. Thus, the compacted biomass and high productivity of C. chilensis at the surface derived from its adaptive life-history traits (no OVM) may explain the superior trophic transfer efficiency and hence enormous fisheries yield of the HCS compared to the BCS.

Calanus和Calanoides属的Calanid pe足类是上升流系统中浮游动物群落的关键组成部分。在这里，我们比较了秘鲁北部的洪堡洋流系统（HCS）和纳米比亚北部的本格拉洋流系统（BCS）对应的Calanoides natalis的Calanus chilensis的生活历史特征。提供了有关这些物种沿广泛的水平和垂直尺度分布和丰度模式的综合数据集。来自HCS的C. chilensis几乎仅被限制在最小氧气区（OMZ）上方的表层（50-0 m），而C. natalis从BCS到整个水柱的居住区一直向下延伸至800 m，并通过OMZ进行了发育上的垂直运移（OVM）。纳塔虫的静止阶段在深处积累了大量的脂质（占干重的30-60％，DM），而智利小球藻不依赖脂质储备。这些发现证实，C。chilensis的生命周期不包括深度滞育的OVM。出乎意料的是，比起其他沿海上升流系统，智利小球藻次生产品的区域分布向海上延伸的距离更大（离海岸> 200 km）。不断变化的环境条件迫使这两个关键cal蒲物种针对HCS和BCS制定了特定但不同的生命策略。压实的生物质浓度从架子（≤3g DM m ^-2）到近海水（≤1.5g DM m ^-2）的表层C. chilensis有助于捕食者（例如秘鲁easy鱼）的捕食变得容易而有效。相比之下，纳塔梭菌的大部分生物量都发生在OMZ区域，因此对于缺氧敏感的捕食者是遥不可及的。Calanoid pe足类（例如C. chilensis）在小型中上层鱼类的生长和募集中起着重要的猎物的作用。因此，从其生活史适应性特征（无OVM）获得的智利奇异果的致密生物量和高生产力可能解释了与BCS相比，HCS的营养传递效率高，因此渔业产量高。