Diurnal variability in alkaline phosphatase activity and the potential role of zooplankton
Diurnal variability in alkaline phosphatase activity and the potential role of zooplankton
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DOI：
10.1002/lol2.10104
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发表时间：
2019-06-01
影响因子：
7.8
通讯作者：
Mahaffey, C.
中科院分区：
文献类型：
--
作者：
Davis, C.;Lohan, M. C.;Mahaffey, C.
每天的光暗周期驱动着许多海洋过程的昼夜节律，包括光合作用、基因表达和浮游动物昼夜垂直迁移（DVM）。在磷酸盐枯竭的表层海洋区域，微生物产生金属酶，如碱性磷酸酶（AP），以获得溶解的有机磷。在这里，我们使用两个独立的数据集，在亚热带北大西洋的AP活动（阿帕）的日变化提供了新的证据，阿帕在夜间高出两到三倍。我们表明，浮游动物是AP的来源，并假设浮游动物DVM是一个来源，增强AP在表面沃茨在夜间，减少或降解AP在白天。我们的研究结果挑战了目前的假设，阿帕是线性超过24小时的时间。虽然未来的海洋情景预测海洋磷酸盐限制的加剧和扩大，但我们的研究结果表明浮游动物在再生磷酸盐方面的作用目前在概念和数值模型中缺失。
Daily light-dark cycles drive the circadian rhythm of many ocean processes including photosynthesis, gene expression, and zooplankton diel vertical migration (DVM). In phosphate deplete surface ocean regions, microbes produce metalloenzymes, such as alkaline phosphatases (AP), to access dissolved organic phosphorus. Here, we provide novel evidence of diurnal variation in AP activity (APA) in the subtropical North Atlantic using two independent datasets, with APA being two- to three-fold higher at night. We demonstrate that zooplankton are a source of AP and postulate that zooplankton DVM is a source of enhanced AP in the surface waters at night, with reduction or degradation of AP during the day. Our results challenge the current assumption that APA is linear over a 24-h period. While future ocean scenarios predict intensification and expansion of oceanic phosphate limitation, our findings indicate a role for zooplankton in regenerating phosphate that is currently missing in conceptual and numerical models.