Rapid unpredicted changes in the stratification of marine lake Mogilnoe (Kildin Island, the Barents Sea) through the early 21st century
| Autor: | Sergey S. Malavenda, Mikhail Fedyuk, Sergei Goldin, Elena D. Krasnova, Natalia Shunatova, Igor A. Stogov, Mikhail Ivanov, Petr Strelkov, N.V. Polyakova, Ekaterina A. Movchan, Tatiana Ivanova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
zooplankton 010504 meteorology & atmospheric sciences Stratification (water) water stratification Oceanography 01 natural sciences Zooplankton lcsh:Oceanography Earth and Planetary Sciences (miscellaneous) Environmental Chemistry zoobenthos lcsh:GC1-1581 lcsh:Environmental sciences 0105 earth and related environmental sciences General Environmental Science lcsh:GE1-350 010604 marine biology & hydrobiology conservation Biota The arctic Salinity inter-annual changes Geography Benthic zone arctic anchialine lake |
| Zdroj: | Polar Research, Vol 38, Iss 0, Pp 1-7 (2019) |
| ISSN: | 1751-8369 |
| Popis: | Lake Mogilnoe is a rare example of an anchialine lake (with subterranean connection to the ocean) in the Arctic, a refuge for landlocked populations of marine organisms. The lake has been the subject of intensive studies since the end of the 19th century. Here we demonstrate that between the 2003–07 and 2015–18 observation periods this permanently stratified lake experienced significant changes. The surface salinity increased and exceeded the tolerance limits of many freshwater organisms. The bottom anoxia expanded from one-fifth to one-third of the lake volume. Such a turn in stratification affected both composition and distribution of biota: freshwater zooplanktonic species virtually disappeared, while benthic communities shifted to shallower depths. Although recent changes in the lake stratification are consistent with the long-term trend, their scale is much larger than has been observed during the past 120 years. It was earlier considered that the lake dynamics were mainly affected by human activity in the vicinity of the lake. However, lack of human activity around Mogilnoe during last decades persuades us to search for the natural causes of the recorded changes. |
| Databáze: | OpenAIRE |
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