Increased Nitrogen Loading Boosts Summer Phytoplankton Growth by Alterations in Resource and Zooplankton Control: A Mesocosm Study
The effectiveness of controlling nitrogen (N) to manage eutrophication of aquatic ecosystems remains debated. To understand the mechanisms behind phytoplankton growth in shallow lakes (resource and grazing effects) under contrasting N loading scenarios, we conducted a 70-days mesocosm experiment in...
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Frontiers Media S.A.
2021
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oai:doaj.org-article:5e4016ca7fc44ad39360ac5aa89e35872021-12-01T23:08:23ZIncreased Nitrogen Loading Boosts Summer Phytoplankton Growth by Alterations in Resource and Zooplankton Control: A Mesocosm Study2296-665X10.3389/fenvs.2021.772314https://doaj.org/article/5e4016ca7fc44ad39360ac5aa89e35872021-12-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fenvs.2021.772314/fullhttps://doaj.org/toc/2296-665XThe effectiveness of controlling nitrogen (N) to manage eutrophication of aquatic ecosystems remains debated. To understand the mechanisms behind phytoplankton growth in shallow lakes (resource and grazing effects) under contrasting N loading scenarios, we conducted a 70-days mesocosm experiment in summer. The mesocosms contain natural plankton communities deriving from a 10-cm layer of lake sediment and 450 L of lake water. We also added two juvenile crucian carp (Carassius carassius) in each mesocosm to simulate presence of the prevailing omni-benthivorous fish in subtropical lakes. Our results showed that N addition increased not only water N levels but also total phosphorus (TP) concentrations, which together elevated the phytoplankton biomass and caused strong dominance of cyanobacteria. Addition of N significantly lowered the herbivorous zooplankton to phytoplankton biomass ratio and promoted the phytoplankton yield per nutrient (Chl-a: TP or Chl-a: TN ratio), indicating that summer N addition likely also favored phytoplankton growth through reduced grazing by zooplankton. Accordingly, our study indicates that summer N loading may boost eutrophication via both changes in resource and grazing control in shallow lakes. Thus, alleviation of eutrophication in shallow eutrophic lakes requires a strategic approach to control both nutrients (N and P) appropriately.Hu HeKunquan ChenYingxun DuKuanyi LiKuanyi LiZhengwen LiuZhengwen LiuZhengwen LiuErik JeppesenErik JeppesenErik JeppesenErik JeppesenMartin SøndergaardMartin SøndergaardFrontiers Media S.A.articleeutrophicationsediment P releasezooplankton-cyanobacteria interactionN:P ratiomesocosmEnvironmental sciencesGE1-350ENFrontiers in Environmental Science, Vol 9 (2021) |
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eutrophication sediment P release zooplankton-cyanobacteria interaction N:P ratio mesocosm Environmental sciences GE1-350 |
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eutrophication sediment P release zooplankton-cyanobacteria interaction N:P ratio mesocosm Environmental sciences GE1-350 Hu He Kunquan Chen Yingxun Du Kuanyi Li Kuanyi Li Zhengwen Liu Zhengwen Liu Zhengwen Liu Erik Jeppesen Erik Jeppesen Erik Jeppesen Erik Jeppesen Martin Søndergaard Martin Søndergaard Increased Nitrogen Loading Boosts Summer Phytoplankton Growth by Alterations in Resource and Zooplankton Control: A Mesocosm Study |
| description |
The effectiveness of controlling nitrogen (N) to manage eutrophication of aquatic ecosystems remains debated. To understand the mechanisms behind phytoplankton growth in shallow lakes (resource and grazing effects) under contrasting N loading scenarios, we conducted a 70-days mesocosm experiment in summer. The mesocosms contain natural plankton communities deriving from a 10-cm layer of lake sediment and 450 L of lake water. We also added two juvenile crucian carp (Carassius carassius) in each mesocosm to simulate presence of the prevailing omni-benthivorous fish in subtropical lakes. Our results showed that N addition increased not only water N levels but also total phosphorus (TP) concentrations, which together elevated the phytoplankton biomass and caused strong dominance of cyanobacteria. Addition of N significantly lowered the herbivorous zooplankton to phytoplankton biomass ratio and promoted the phytoplankton yield per nutrient (Chl-a: TP or Chl-a: TN ratio), indicating that summer N addition likely also favored phytoplankton growth through reduced grazing by zooplankton. Accordingly, our study indicates that summer N loading may boost eutrophication via both changes in resource and grazing control in shallow lakes. Thus, alleviation of eutrophication in shallow eutrophic lakes requires a strategic approach to control both nutrients (N and P) appropriately. |
| format |
article |
| author |
Hu He Kunquan Chen Yingxun Du Kuanyi Li Kuanyi Li Zhengwen Liu Zhengwen Liu Zhengwen Liu Erik Jeppesen Erik Jeppesen Erik Jeppesen Erik Jeppesen Martin Søndergaard Martin Søndergaard |
| author_facet |
Hu He Kunquan Chen Yingxun Du Kuanyi Li Kuanyi Li Zhengwen Liu Zhengwen Liu Zhengwen Liu Erik Jeppesen Erik Jeppesen Erik Jeppesen Erik Jeppesen Martin Søndergaard Martin Søndergaard |
| author_sort |
Hu He |
| title |
Increased Nitrogen Loading Boosts Summer Phytoplankton Growth by Alterations in Resource and Zooplankton Control: A Mesocosm Study |
| title_short |
Increased Nitrogen Loading Boosts Summer Phytoplankton Growth by Alterations in Resource and Zooplankton Control: A Mesocosm Study |
| title_full |
Increased Nitrogen Loading Boosts Summer Phytoplankton Growth by Alterations in Resource and Zooplankton Control: A Mesocosm Study |
| title_fullStr |
Increased Nitrogen Loading Boosts Summer Phytoplankton Growth by Alterations in Resource and Zooplankton Control: A Mesocosm Study |
| title_full_unstemmed |
Increased Nitrogen Loading Boosts Summer Phytoplankton Growth by Alterations in Resource and Zooplankton Control: A Mesocosm Study |
| title_sort |
increased nitrogen loading boosts summer phytoplankton growth by alterations in resource and zooplankton control: a mesocosm study |
| publisher |
Frontiers Media S.A. |
| publishDate |
2021 |
| url |
https://doaj.org/article/5e4016ca7fc44ad39360ac5aa89e3587 |
| work_keys_str_mv |
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