Diurnal variation in the convection-driven vertical distribution of phytoplankton under ice and after ice-off in large Lake Onego (Russia)
| Autor: | Bastiaan Willem Ibelings, Marie-Caroline Tiffay, Nataliia Kalinkina, Elena Makarova, M. T. Syarki, A. N. Sharov, Elena Tekanova, Patrick Venail, Tatjana Tchekryzheva, Roman Zdorovennov, Ena Lucia Suarez, Evanthia Mantzouki |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Sunlight Convection 010504 meteorology & atmospheric sciences Thermal bar Light 010604 marine biology & hydrobiology Diurnal temperature variation Aquatic Science Atmospheric sciences 01 natural sciences Water layer Dissolved organic carbon Phytoplankton ddc:550 Life under ice Environmental science Layer (electronics) 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Inland Waters, Vol. 9, No 2 (2019) pp. 193-204 |
| ISSN: | 2044-2041 |
| Popis: | When sunlight penetrates the ice layer covering lakes in winter, it warms the top water layer and sets up convection, with several potentially contrasting effects on phytoplankton. While convective mixing keeps cells in suspension and prevents sedimentation losses, it may also transport phytoplankton well below the euphotic zone. We investigated diurnal variations in the vertical distribution of phytoplankton under ice and just after ice-off in Lake Onego (Russia), a lake with moderate to high colored dissolved organic carbon (CDOM) levels. We showed that diurnal variation in convection under ice restricts phytoplankton access to light in the morning hours to a narrow euphotic zone, whereas cells are mixed through a deep aphotic layer in the afternoon. After ice-off, low chlorophyll a was found on the open-water side of the thermal bar as convection distributed cells throughout the water column. By contrast, the inshore side had significantly higher concentrations of chlorophyll a (p |
| Databáze: | OpenAIRE |
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