Light and hydrologic connectivity drive dissolved oxygen synchrony in stream networks
Light and hydrologic connectivity drive dissolved oxygen synchrony in stream networks
复制标题
光和水文连通性驱动河流网络中溶解氧的同步
DOI:
10.1002/lno.12271
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发表时间:
2022
影响因子:
4.5
通讯作者:
Moatar, Florentina
中科院分区:
文献类型:
--
作者:
Diamond, Jacob S.;Pinay, Gilles;Bernal, Susana;Cohen, Matthew J.;Lewis, David;Lupon, Anna;Zarnetske, Jay;Moatar, Florentina
Stream dissolved oxygen (DO) dynamics are an outcome of metabolic activity and subsequently regulate ecosystem functions such as in‐stream solute and sediment reactions. The synchronization of DO signals in and across stream networks is both a cause and effect of the mode and timing of these functions, but there is limited empirical evidence for network patterns of DO synchrony. We used high frequency DO measurements at 42 sites spanning five catchments and stream orders to evaluate DO signal synchrony in response to variation in light (a driver of photosynthesis) and discharge (a control on DO signal spatial extent). We hypothesized that stream network DO synchrony arises when regional controls dominate: when light inputs are synchronous and when longitudinal hydrologic connectivity is high. By complement, we predicted that DO signal synchrony decreases as light becomes more asynchronous and stream flows decline or become discontinuous. Our results supported this hypothesis: greater DO signal synchrony arose with increasing light synchrony and flow connectivity. A model including these two controls explained 70% of variation in DO synchrony. We conclude that DO synchrony patterns within‐ and across‐networks support the current paradigm of discharge and light control on stream metabolic activity. Finally, we propose that DO synchrony patterns are likely a useful prerequisite for scaling subdaily metabolism estimates to network and regional scales.
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通讯作者:
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影响因子:
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DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
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通讯作者:
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影响因子:
9.8
作者:
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通讯作者:
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