| Abstract | This paper reports a study of oxygen and redox conditions, trophic status, and phytoplankton community in the meromictic Lake Idro (Italy) from 2010 to 2014. The sequence of causes and effects of meromixis are also evaluated by comparing recent research with studies conducted from the late 1960s to the mid-1990s. In the last half century, Lake Idro was steadily meromictic due to solutes which accumulated in its deep waters, along with both dissolved nutrients and chemically reduced substances produced by the anaerobic microbial metabolism. These substances were retained in bottom waters and made unavailable to upper layers until stratification broke. Mixing episodes occurred in 2005-2006 altering stratification, and oxygen and nutrient distribution within the lake. The potential full overturn effects were also evaluated as potential oxygen consumption due to the oxidation of reduced substances to forecast possible oxygen exhaustion and collapse of biological communities. Finally, meromixis is discussed as a potential threat for deep perialpine lakes using Lake Idro as a reference to comparatively evaluate the present status and possible future trends. |
| Text | 399540 2018 10.1007/s10750 018 3767 9 Scopus 2 s2.0 85053753653 ISI Web of Science WOS 000448578500003 Meromixis Redox status Trophic status Phytoplankton Long term Persistence of meromixis and its effects on redox conditions and trophic status in Lake Idro Southern Alps, Italy Viaroli P.; Azzoni R.; Bartoli M.; Iacumin P.; Longhi D.; Mosello R.; Rogora M.; Rossetti G.; Salmaso N.; Nizzoli D. Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 11/A, Parma, 43124, , Italy; Klaipeda University, Klaipeda, 92294, , Lithuania; CNR Institute of Ecosystem Study, L.go Tonolli 50, Verbania Pallanza, 28922, , Italy; Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, S. Michele all Adige, 38010, , Italy This paper reports a study of oxygen and redox conditions, trophic status, and phytoplankton community in the meromictic Lake Idro Italy from 2010 to 2014. The sequence of causes and effects of meromixis are also evaluated by comparing recent research with studies conducted from the late 1960s to the mid 1990s. In the last half century, Lake Idro was steadily meromictic due to solutes which accumulated in its deep waters, along with both dissolved nutrients and chemically reduced substances produced by the anaerobic microbial metabolism. These substances were retained in bottom waters and made unavailable to upper layers until stratification broke. Mixing episodes occurred in 2005 2006 altering stratification, and oxygen and nutrient distribution within the lake. The potential full overturn effects were also evaluated as potential oxygen consumption due to the oxidation of reduced substances to forecast possible oxygen exhaustion and collapse of biological communities. Finally, meromixis is discussed as a potential threat for deep perialpine lakes using Lake Idro as a reference to comparatively evaluate the present status and possible future trends. 824 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 85053753653 partnerID=q2rCbXpz Articolo 2018_Hydrobiologia_824_51_69.pdf Articolo in rivista Kluwer 1573 5117 Hydrobiologia Dordr., Online Hydrobiologia Dordr., Online Hydrobiologia Dordr., Online Hydrobiologia. Dordr., Online Hydrobiologia Dordrecht Dordr., Online Hydrobiologia Boston Dordr., Online Hydrobiologia London Dordr., Online rosario.mosello MOSELLO ROSARIO michela.rogora ROGORA MICHELA |
