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      Ecology under lake ice

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      Ecology Letters
      Wiley-Blackwell

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          Lakes as sentinels of climate change.

          While there is a general sense that lakes can act as sentinels of climate change, their efficacy has not been thoroughly analyzed. We identified the key response variables within a lake that act as indicators of the effects of climate change on both the lake and the catchment. These variables reflect a wide range of physical, chemical, and biological responses to climate. However, the efficacy of the different indicators is affected by regional response to climate change, characteristics of the catchment, and lake mixing regimes. Thus, particular indicators or combinations of indicators are more effective for different lake types and geographic regions. The extraction of climate signals can be further complicated by the influence of other environmental changes, such as eutrophication or acidification, and the equivalent reverse phenomena, in addition to other land-use influences. In many cases, however, confounding factors can be addressed through analytical tools such as detrending or filtering. Lakes are effective sentinels for climate change because they are sensitive to climate, respond rapidly to change, and integrate information about changes in the catchment.
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            Historical trends in lake and river ice cover in the northern hemisphere

            Freeze and breakup dates of ice on lakes and rivers provide consistent evidence of later freezing and earlier breakup around the Northern Hemisphere from 1846 to 1995. Over these 150 years, changes in freeze dates averaged 5.8 days per 100 years later, and changes in breakup dates averaged 6.5 days per 100 years earlier; these translate to increasing air temperatures of about 1.2 degrees C per 100 years. Interannual variability in both freeze and breakup dates has increased since 1950. A few longer time series reveal reduced ice cover (a warming trend) beginning as early as the 16th century, with increasing rates of change after about 1850.
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              Impact of a shrinking Arctic ice cover on marine primary production

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                Author and article information

                Journal
                Ecology Letters
                Ecol Lett
                Wiley-Blackwell
                1461023X
                January 2017
                January 2017
                : 20
                : 1
                : 98-111
                Article
                10.1111/ele.12699
                27889953
                8da14ec1-1fda-4a2f-a9c6-27ac3bbd948f
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1

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