Depth and basin shape constrain ecosystem metabolism in lakes dominated by benthic primary producers
Depth and basin shape constrain ecosystem metabolism in lakes dominated by benthic primary producers
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深度和盆地形状限制了以底栖初级生产者为主的湖泊的生态系统代谢
DOI：
10.1002/lno.12236
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发表时间：
2022
影响因子：
4.5
通讯作者：
D. Seekell
中科院分区：
文献类型：
--
作者：
M. Klaus;H. Verheijen;J. Karlsson;D. Seekell
代谢是最基本的生态系统过程之一，但以底栖初级生产者为主的湖泊中代谢率变化的驱动因素仍然受到很大限制。在这里，我们报告了43个瑞典北极高山湖泊的全湖代谢的幅度和潜在驱动因素，基于自由水昼夜氧技术，在湖泊表面和底部附近的开放水域季节部署了探测器。总初级生产力（GPP）和生态系统呼吸（R）是强耦合的，在湖泊之间的范围为0.06至0.45 mg L − 1 d − 1和0.05至0.43 mg L−1 d−1。平均而言，GPP和R从相对较浅的湖泊到较深的湖泊（平均深度0.5-10.9米）减少了8倍，从凹湖到凸湖（平均深度：最大深度0.2-0.5米）减少了2倍。我们将其归因于光限制和底栖GPP对湖冰干扰的特定形状敏感性。净生态系统生产力（GPP-R）的范围为-0.09至0.14 mg L-1 d-1，平均而言，从正向负向更深的湖泊和溶解有机碳（DOC; 0.5-7.4 mg DOC L-1）丰富的湖泊转变。代谢估计值很高（大约是平均R和GPP的1倍和3倍），特别是在绝缘性低和每日风速变化的深湖中。我们的研究结果证实了DOC在刺激净异养中的作用，并强调了湖泊形状对底栖动物主导的湖泊生态系统生产力的新影响及其对湖泊冰盖变化的响应。
Metabolism is one of the most fundamental ecosystem processes, but the drivers of variation in metabolic rates among lakes dominated by benthic primary producers remain poorly constrained. Here, we report the magnitudes and potential drivers of whole‐lake metabolism across 43 Swedish arctic–alpine lakes, based on the free‐water diel oxygen technique with sondes deployed during the open‐water season near the surface and bottom of the lakes. Gross primary production (GPP) and ecosystem respiration (R) were strongly coupled and ranged from 0.06 to 0.45 mg and 0.05 to 0.43 mg L−1 d−1 among lakes. On average, GPP and R decreased eightfold from relatively shallow to deep lakes (mean depth 0.5–10.9 m) and twofold from concave to convex lakes (mean depth: maximum depth 0.2–0.5). We attribute this to light limitation and shape‐specific sensitivity of benthic GPP to disturbance by lake ice. Net ecosystem production (GPP‐R) ranged from −0.09 to 0.14 mg L−1 d−1 and switched, on average, from positive to negative towards deeper lakes and lakes richer in dissolved organic carbon (DOC; 0.5–7.4 mg DOC L−1). Uncertainties in metabolism estimates were high (around one and three times mean R and GPP), especially in deep lakes with low insulation and diurnally variable wind speed. Our results confirm the role of DOC in stimulating net heterotrophy and highlight novel effects of lake shape on productivity in benthic‐dominated lake ecosystems and its response to changes in lake ice cover.
空间结构的相似性限制了生态系统关系：建立对湖泊的宏观理解
影响因子：
6.4
作者：
Lapierre, Jean‐Francois;Collins, Sarah M.;Seekell, David A.;Spence Cheruvelil, Kendra;Tan, Pang‐Ning;Skaff, Nicholas K.;Taranu, Zofia E.;Fergus, C. Emi;Soranno, Patricia A.
通讯作者：
Soranno, Patricia A.
影响因子：
3.7
作者：
Kelly, Patrick T.;Solomon, Christopher T.;Jones, Stuart E.
通讯作者：
Jones, Stuart E.