From drought to flood: Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake

Research output: Contribution to journalJournal articleResearchpeer-review

Standard

From drought to flood : Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake. / Kragh, Theis; Martinsen, Kenneth Thorø; Kristensen, Emil; Sand-Jensen, Kaj.

In: Science of the Total Environment, Vol. 739, 140072, 2020.

Research output: Contribution to journalJournal articleResearchpeer-review

Harvard

Kragh, T, Martinsen, KT, Kristensen, E & Sand-Jensen, K 2020, 'From drought to flood: Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake', Science of the Total Environment, vol. 739, 140072. https://doi.org/10.1016/j.scitotenv.2020.140072

APA

Kragh, T., Martinsen, K. T., Kristensen, E., & Sand-Jensen, K. (2020). From drought to flood: Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake. Science of the Total Environment, 739, [140072]. https://doi.org/10.1016/j.scitotenv.2020.140072

Vancouver

Kragh T, Martinsen KT, Kristensen E, Sand-Jensen K. From drought to flood: Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake. Science of the Total Environment. 2020;739. 140072. https://doi.org/10.1016/j.scitotenv.2020.140072

Author

Kragh, Theis ; Martinsen, Kenneth Thorø ; Kristensen, Emil ; Sand-Jensen, Kaj. / From drought to flood : Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake. In: Science of the Total Environment. 2020 ; Vol. 739.

Bibtex

@article{8560a891b8e54e549b21f0419e6bc71b,
title = "From drought to flood: Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake",
abstract = "Fish kills are a recurring phenomenon in hypereutrophic lakes. The effects of a sudden injection of anoxic bottom water into surface waters are well known, as well as the degradation of phytoplankton blooms and the release of phytoplankton toxins. However, in this study we report on a new, climate-related cause of fish kills in a shallow lake. We observed that a long period of drought in a hot summer followed by heavy rain resulted in a large input of labile organic matter. This was followed by a condition of whole-lake anoxia and fish kill in the lake basin receiving the input, while the second basin, immediately downstream, was left unaffected. To test the causal relationship between these events, an oxygen model calculated that respiration had increased by 230% following the organic input and caused whole-lake nocturnal anoxia for four days despite unaltered daytime photosynthesis. One year after the fish kill, roach and bream had migrated from the downstream lake basin and re-established dense populations, while large predatory perch and pike remained very few. This imbalance in the fish food webs may last for several years and in turn increase predation on zooplankton and release phytoplankton from grazing control. The prolonged effects of fish kills on fish and lake community structure demand further research, as weather-induced anoxia can be expected to become more common.",
keywords = "Climate change, Extreme weather, Flash flood, Heatwave",
author = "Theis Kragh and Martinsen, {Kenneth Thor{\o}} and Emil Kristensen and Kaj Sand-Jensen",
year = "2020",
doi = "10.1016/j.scitotenv.2020.140072",
language = "English",
volume = "739",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - From drought to flood

T2 - Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake

AU - Kragh, Theis

AU - Martinsen, Kenneth Thorø

AU - Kristensen, Emil

AU - Sand-Jensen, Kaj

PY - 2020

Y1 - 2020

N2 - Fish kills are a recurring phenomenon in hypereutrophic lakes. The effects of a sudden injection of anoxic bottom water into surface waters are well known, as well as the degradation of phytoplankton blooms and the release of phytoplankton toxins. However, in this study we report on a new, climate-related cause of fish kills in a shallow lake. We observed that a long period of drought in a hot summer followed by heavy rain resulted in a large input of labile organic matter. This was followed by a condition of whole-lake anoxia and fish kill in the lake basin receiving the input, while the second basin, immediately downstream, was left unaffected. To test the causal relationship between these events, an oxygen model calculated that respiration had increased by 230% following the organic input and caused whole-lake nocturnal anoxia for four days despite unaltered daytime photosynthesis. One year after the fish kill, roach and bream had migrated from the downstream lake basin and re-established dense populations, while large predatory perch and pike remained very few. This imbalance in the fish food webs may last for several years and in turn increase predation on zooplankton and release phytoplankton from grazing control. The prolonged effects of fish kills on fish and lake community structure demand further research, as weather-induced anoxia can be expected to become more common.

AB - Fish kills are a recurring phenomenon in hypereutrophic lakes. The effects of a sudden injection of anoxic bottom water into surface waters are well known, as well as the degradation of phytoplankton blooms and the release of phytoplankton toxins. However, in this study we report on a new, climate-related cause of fish kills in a shallow lake. We observed that a long period of drought in a hot summer followed by heavy rain resulted in a large input of labile organic matter. This was followed by a condition of whole-lake anoxia and fish kill in the lake basin receiving the input, while the second basin, immediately downstream, was left unaffected. To test the causal relationship between these events, an oxygen model calculated that respiration had increased by 230% following the organic input and caused whole-lake nocturnal anoxia for four days despite unaltered daytime photosynthesis. One year after the fish kill, roach and bream had migrated from the downstream lake basin and re-established dense populations, while large predatory perch and pike remained very few. This imbalance in the fish food webs may last for several years and in turn increase predation on zooplankton and release phytoplankton from grazing control. The prolonged effects of fish kills on fish and lake community structure demand further research, as weather-induced anoxia can be expected to become more common.

KW - Climate change

KW - Extreme weather

KW - Flash flood

KW - Heatwave

U2 - 10.1016/j.scitotenv.2020.140072

DO - 10.1016/j.scitotenv.2020.140072

M3 - Journal article

C2 - 32554120

AN - SCOPUS:85086308811

VL - 739

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

M1 - 140072

ER -

ID: 244239632