Extreme diel dissolved oxygen and carbon cycles in shallow vegetated lakes

Proceedings of the Royal Society B: Biological Sciences - Tập 284 Số 1862 - Trang 20171427 - 2017
Mikkel René Andersen1, Theis Kragh2, Kaj Sand‐Jensen3
1Mikkel R. Andersen http://orcid.org/0000-0003-2104-2894 [email protected] Google Scholar Find this author on PubMed
2Theis Kragh Google Scholar Find this author on PubMed
3Kaj Sand-Jensen Google Scholar Find this author on PubMed

Tóm tắt

A common perception in limnology is that shallow lakes are homogeneously mixed owing to their small water volume. However, this perception is largely gained by downscaling knowledge from large lakes to their smaller counterparts. Here we show that shallow vegetated lakes (less than 0.6 m), in fact, undergo recurring daytime stratification and nocturnal mixing accompanied by extreme chemical variations during summer. Dense submerged vegetation effectively attenuates light and turbulence generating separation between warm surface waters and much colder bottom waters. Photosynthesis in surface waters produces oxygen accumulation and CO 2 depletion, whereas respiration in dark bottom waters causes anoxia and CO 2 accumulation. High daytime pH in surface waters promotes precipitation of CaCO 3 which is re-dissolved in bottom waters. Nocturnal convective mixing re-introduces oxygen into bottom waters for aerobic respiration and regenerated inorganic carbon into surface waters, which supports intense photosynthesis. Our results reconfigure the basic understanding of local environmental gradients in shallow lakes, one of the most abundant freshwater habitats globally.

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Proceedings of the Royal Society B: Biological Sciences

Tập 284 Số 1862

20171427

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