Environmental and climatic factors affecting winter hypoxia in a freshwater lake: evidence for a hypoxia refuge and for re-oxygenation prior to spring ice loss
Environmental and climatic factors affecting winter hypoxia in a freshwater lake: evidence for a hypoxia refuge and for re-oxygenation prior to spring ice loss
复制标题
影响淡水湖冬季缺氧的环境和气候因素：缺氧避难所和春季冰损失之前重新充氧的证据
作者：
Michael N. Davis;T. McMahon;K. Cutting;M. Jaeger
低溶解氧，或缺氧，是冬季冰封湖泊中的常见现象。我们测量溶解氧（DO）之前，期间和之后的结冰，以表征冬季缺氧的时间，严重程度和空间变异性在上红岩湖，蒙大拿州，回家的最后剩下的湖泊种群之一的地方性蒙大拿州北极灰鹤（Thymallus arcticus）。与大多数以前的调查，冬季易发生湖泊，我们观察到相当大的水平空间变异DO，非线性的冬季氧耗率，和湖泊范围内的复氧2-4周前春季冰损失。部分上1米的湖泊和附近的流口保持良好的含氧，即使在冬季后期。DO水平与最高日气温密切相关。我们对28年天气记录的分析显示，冬季缺氧风险的年际变化很大，上红岩湖冬季严重程度（最高气温≤ 0°C的天数）略有下降趋势。我们在研究中使用的方法提供了一个有用的框架，用于量化和绘制冬季缺氧程度和严重程度的季节性动态，并确定关键的冬季栖息地。
Low dissolved oxygen, or hypoxia, is a common phenomenon in ice-covered lakes in winter. We measured dissolved oxygen (DO) before, during, and after ice-over to characterize the timing, severity, and spatial variability of winter hypoxia in Upper Red Rock Lake, Montana, home to one of the last remaining lacustrine populations of endemic Montana Arctic Grayling (Thymallus arcticus). Unlike most previous investigations of winterkill-prone lakes, we observed considerable horizontal spatial variability in DO, a non-linear winter oxygen depletion rate, and lake-wide re-oxygenation 2–4 weeks prior to spring ice loss. Parts of the upper 1 m of the lake and near stream mouths remained well-oxygenated even during late winter. DO levels were strongly associated with maximum daily air temperature. Our analysis of a 28-year weather record revealed large interannual variability in risk of winter hypoxia, with a slight declining trend in winter severity (number of days with maximum air temperatures ≤ 0°C) in Upper Red Rock Lake. The approach we used in our study provides a useful framework for quantifying and mapping the seasonal dynamics of the extent and severity of winter hypoxia, and for identifying critical winter habitats.
干涉合成孔径雷达 (InSAR) 栖息地适宜性模型，用于识别北极泻湖 Coregonine 白鲑的越冬条件。
影响因子：
1.4
作者：
Tibbles,Marguerite;Falke,JeffreyA;Mahoney,AndrewR;Robards,MartinD;Seitz,AndrewC
通讯作者：
Seitz,AndrewC