Long-term changes in hypolimnetic dissolved oxygen in a large lake: Effects of invasive mussels, eutrophication and climate change on Lake Simcoe, 1980–2012
Long-term changes in hypolimnetic dissolved oxygen in a large lake: Effects of invasive mussels, eutrophication and climate change on Lake Simcoe, 1980–2012
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大湖低湖溶解氧的长期变化：入侵贻贝、富营养化和气候变化对锡姆科湖的影响，1980-2012
DOI：
10.1016/j.jglr.2018.05.016
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发表时间：
2018
影响因子：
2.2
通讯作者：
E. Stainsby
中科院分区：
文献类型：
--
作者：
Jiahua Li;L. Molot;M. Palmer;J. Winter;Joelle D. Young;E. Stainsby
过去几十年来，锡姆科湖受到多种环境驱动因素的影响，特别是磷 (P) 负荷减少、气候变化和 1996 年确立的德莱森贻贝 (DM) 等入侵物种。我们研究了这些驱动因素对 1980 年至 1980 年间无冰季节期间肯彭费尔特湾 K42 站低于 18m 的体积加权低浅层溶解氧浓度 (VWHDO) 的累积影响。 2012. 低记忆溶解氧消耗开始于早春，当时可以观察到热分层，但很弱，并持续整个无冰季节，直到冷却充分降低水柱稳定性。与糖尿病侵袭前时期（1980-1995）相比，糖尿病后时期（1996-2012）年平均VWHDOinit高出2.4mgL-1，VWHDOmin高出1.54mgL-1，消耗期（L）平均持续时间长16天。 1996 年之后，平均 DO 消耗率 (DR) 和温度调整的 DO 消耗率 (DRadj) 略低（分别为 7% 和 5%）。 P 对照和 DM 对 VWHDO 有积极影响，可能是通过降低生产力和将有机物从低沼泽中转移出来。然而，较长的 L 显然抵消了 VWHDOmin 的改进。如果与区域变暖相关的 L 持续延长，则需要采取额外措施减少磷负荷，以实现整个夏季和秋季将 VWHDOmin 维持在 7mgO2L−1 目标之上的目标。
Lake Simcoe has been influenced by multiple environmental drivers over the past decades, especially by reductions in phosphorus (P) loading, climate change, and invasive species such as dreissenid mussels (DM) which became firmly established in 1996. We examined the cumulative impact of these drivers on the volume-weighted hypolimnetic dissolved oxygen concentration (VWHDO) below 18 m at station K42 in Kempenfelt Bay during ice-free seasons from 1980 to 2012. Hypolimnetic DO depletion began in early spring when thermal stratification was observable but weak and continued throughout the ice-free season until cooling sufficiently lowered water column stability. In comparison to the pre-DM invasion period (1980–1995), mean annual VWHDOinitwas 2.4 mg L−1higher in the post-DM period (1996–2012), VWHDOminwas 1.54 mg L−1higher and the mean duration of the depletion period (L) was 16 days longer. Mean DO depletion rate (DR) and temperature adjusted DO depletion rate (DRadj) were slightly lower (7% and 5%, respectively) after 1996. P controls and DM had a positive effect on VWHDO, presumably by lowering productivity and diverting organic matter away from the hypolimnon. However, longer L apparently offset improvements in VWHDOmin. If lengthening of L associated with regional warming continues, then additional efforts to reduce P loads will be necessary to achieve the goal of maintaining VWHDOminabove the target of 7 mg O2L−1throughout the summer and fall.
影响因子：
5.2
作者：
O'Reilly, Catherine M.;Sharma, Sapna;Zhang, Guoqing
通讯作者：
Zhang, Guoqing