Hypoxia is intensified in tropical and subtropical estuarine and coastal waters and brings about lethal and sublethal effects to marine copepods. The physiological and behavioral responses of the subtropical calanoid copepod Temora turbinata were tested after short-term exposure to hypoxia. The LD₅₀ values were 3.02 ± 0.21, 2.00 ± 0.35, and 3.11 ± 0.31 mg L⁻¹ for nauplii (II-III), copepodites (II-III), and female adults, respectively. With a decrease in the ambient dissolved oxygen (DO) level from 8 to 0.5 mg L⁻¹, the ingestion rates decreased significantly at all life stages, as did oxygen consumption in female adults. In an artificial stratification column with a DO gradient, female adults exhibited an obvious avoidance response to the hypoxic bottom layer. Our study provides preliminary evidence for high hypoxia sensitivity in T. turbinata and implies that the DO level may be the main factor controlling the distribution of this species in tropical and subtropical coastal and estuarine waters.

缺氧在热带和亚热带河口和沿海水域加剧，对海洋桡足类造成致命和亚致命影响。在短期暴露于缺氧后，测试了亚热带海鞘桡足类Temora turbinata的生理和行为反应。无节幼体 (II-III)、桡足类 (II-III) 和雌性成虫的 LD ₅₀值分别为 3.02 ± 0.21、2.00 ± 0.35 和 3.11 ± 0.31 mg L ^-1。随着环境溶解氧 (DO) 水平从 8 降至 0.5 mg L ^-1，摄入率在所有生命阶段都显着下降，女性成年人的耗氧量也是如此。在具有 DO 梯度的人工分层柱中，雌性成虫对低氧底层表现出明显的回避反应。我们的研究为T. turbinata 的高缺氧敏感性提供了初步证据，并暗示 DO 水平可能是控制该物种在热带和亚热带沿海和河口水域分布的主要因素。