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Keywords = Keddy Index

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13 pages, 2471 KiB  
Article
Wind Exposure Regulates Water Oxygenation in Densely Vegetated Shallow Lakes
by Cristina Ribaudo, Juliette Tison-Rosebery, Mélissa Eon, Gwilherm Jan and Vincent Bertrin
Plants 2021, 10(7), 1269; https://doi.org/10.3390/plants10071269 - 22 Jun 2021
Cited by 7 | Viewed by 2078
Abstract
The presence of dense macrophyte canopies in shallow lakes locally generates thermal stratification and the buildup of labile organic matter, which in turn stimulate the biological oxygen demand. The occurrence of hypoxic conditions may, however, be buffered by strong wind episodes, which favor [...] Read more.
The presence of dense macrophyte canopies in shallow lakes locally generates thermal stratification and the buildup of labile organic matter, which in turn stimulate the biological oxygen demand. The occurrence of hypoxic conditions may, however, be buffered by strong wind episodes, which favor water mixing and reoxygenation. The present study aims at explicitly linking the wind action and water oxygenation within dense hydrophytes stands in shallow lakes. For this purpose, seasonal 24 h-cycle campaigns were carried out for dissolved gases and inorganic compounds measurements in vegetated stands of an oligo-mesotrophic shallow lake. Further, seasonal campaigns were carried out in a eutrophic shallow lake, at wind-sheltered and -exposed sites. Overall results showed that dissolved oxygen (DO) daily and seasonal patterns were greatly affected by the degree of wind exposure. The occurrence of frequent wind episodes favored the near-bottom water mixing, and likely facilitated mechanical oxygen supply from the atmosphere or from the pelagic zone, even during the maximum standing crop of plants (i.e., summer and autumn). A simple model linking wind exposure (Keddy Index) and water oxygenation allowed us to produce an output management map, which geographically identified wind-sheltered sites as the most subjected to critical periods of hypoxia. Full article
(This article belongs to the Special Issue Macrophytes in Inland Waters: From Knowledge to Management)
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