Dynamics of the stream–lake transitional zone affect littoral lake metabolism
Dynamics of the stream–lake transitional zone affect littoral lake metabolism
复制标题
河湖过渡带动态对滨湖湖泊代谢的影响
DOI：
10.1007/s00027-022-00854-7
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发表时间：
2022
期刊：
影响因子：
2.4
通讯作者：
Carey, Cayelan C.
中科院分区：
文献类型：
--
作者：
Ward, Nicole K.;Brentrup, Jennifer A.;Richardson, David C.;Weathers, Kathleen C.;Hanson, Paul C.;Hewett, Russell J.;Carey, Cayelan C.
湖泊生态系统作为分水岭和气候应激源的综合体，是变化的哨兵。然而，应激源和全湖反应之间存在着内在的时滞。河流-湖泊过渡带的水生代谢，包括总初级生产力(GPP)和呼吸(R)，可以弥补湖泊对外来输入的响应时滞。在这项研究中，我们使用高频溶解氧数据和反向模拟来估计夏季表层大气GPP和R的日速率，该湖泊位于一个营养有限的贫营养湖泊，位于两个靠近不同主要流入的沿海站点和一个中上层站点。通过比较GPP和R的气象和湖内预报因子，我们检验了水流变量的相对重要性。流入的水流中，一股比另一股温暖，主要进入湖泊的表层，而较冷的水流主要混合在金属离子或湖底离子中。最大GPP和R速率在沿海站点比中上层站点高0.2mgO2L−1day−1(9-670%)。集成机器学习分析表明， >； 在每日海岸带GPP和R中30%的变异性可归因于河流深度和河流-湖泊过渡带混合度量。暖流的流入可能会刺激沿岸的GPP和R，而冷流的流入只会刺激沿岸带的GPP和R，当与外围混合时。在我们的研究中，在流入附近观察到的较高的GPP和R可能提供了哨兵信号，弥合了河流输入和湖内处理之间的时间滞后，使得能够更早地指示整个湖泊对上游应激源的反应。
Lake ecosystems, as integrators of watershed and climate stressors, are sentinels of change. However, there is an inherent time-lag between stressors and whole-lake response. Aquatic metabolism, including gross primary production (GPP) and respiration (R), of stream–lake transitional zones may bridge the time-lag of lake response to allochthonous inputs. In this study, we used high-frequency dissolved oxygen data and inverse modeling to estimate daily rates of summer epilimnetic GPP and R in a nutrient-limited oligotrophic lake at two littoral sites located near different major inflows and at a pelagic site. We examined the relative importance of stream variables in comparison to meteorological and in-lake predictors of GPP and R. One of the inflow streams was substantially warmer than the other and primarily entered the lake’s epilimnion, whereas the colder stream primarily mixed into the metalimnion or hypolimnion. Maximum GPP and R rates were 0.2–2.5 mg O2L−1day−1(9–670%) higher at littoral sites than the pelagic site. Ensemble machine learning analyses revealed that > 30% of variability in daily littoral zone GPP and R was attributable to stream depth and stream–lake transitional zone mixing metrics. The warm-stream inflow likely stimulated littoral GPP and R, while the cold-stream inflow only stimulated littoral zone GPP and R when mixing with the epilimnion. The higher GPP and R observed near inflows in our study may provide a sentinel-of-the-sentinel signal, bridging the time-lag between stream inputs and in-lake processing, enabling an earlier indication of whole-lake response to upstream stressors.
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