Interactive Effects of Rising Temperature and Nutrient Enrichment on Aquatic Plant Growth, Stoichiometry, and Palatability

Zhang, Peiyu; Kuramae, Ayumi; Leeuwen, Casper H. A. van; Velthuis, Mandy; Donk, Ellen Van; Xu, Jun; Bakker, Elisabeth S.

doi:10.3389/fpls.2020.00058

Cited by 36 publications

(36 citation statements)

References 84 publications

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“…This indicates that while PVI in the DL mesocosms might still have directly benefited from temperature under light conditions over a critical MAL, this was not the case in the SH mesocosms. We can only speculate that this may be due to high growth of periphyton, which is known to have the potential to outcompete macrophytes through its efficient use of resources (light and nutrients) and through shading (Zhang et al, 2019, 2020). Such an explanation would be in line with the strong relation of PVI with MAL but not with temperature in the SH mesocosms.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Accordingly, earlier studies have shown that macrophytes at warmer temperatures can grow taller and thereby get access to more light than at lower temperatures (Barko & Smart, 1981; Rooney & Kalff, 2000). Moreover, a longer growing season in the south and higher metabolic rates and growth rates could contribute as well (Hansson et al, in press; Patrick et al, 2012; Velthuis et al, 2017; Zhang et al, 2019, 2020). On the other hand, under the overall low light conditions (≤76 μmol photons m −2 s −1 ) of the deep mesocosms with high nutrient level (DH), we did not observe an increase in PVI with temperature (Hypothesis 3).…”

Section: Discussionmentioning

confidence: 99%

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Impact of nutrients and water level changes on submerged macrophytes along a temperature gradient: A pan‐European mesocosm experiment

Ersoy

Scharfenberger

Baho

et al. 2020

Global Change Biology

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Impact of nutrients and water level changes on submerged macrophytes along a temperature gradient: A pan‐European mesocosm experiment

Ersoy

Scharfenberger

Baho

et al. 2020

Global Change Biology

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“…(2016). There are also several other studies that do not report correlations between macrophyte palatability and tissue nutrient contents or ratios (e.g., Cronin & Lodge, 2003; Cronin et al., 2002; Zhang et al., 2020). Li et al.…”

Section: Discussionmentioning

confidence: 99%

“…Nutrient enrichment can facilitate epiphyton shading (Jones et al., 2002) and could thus increase the susceptibility of macrophytes to herbivores. Additionally, nutrient enrichment can increase macrophyte tissue nutrient content and decrease their carbon to nutrient ratio (Cronin & Lodge, 2003; Demars & Edwards, 2007; Zhang et al., 2020), making them more palatable and increasing consumption by herbivores (Dorenbosch & Bakker, 2011). Bakker and Nolet (2014) indeed demonstrated an enhanced top‐down control of mallard ducks on submerged macrophytes with nutrient enrichment.…”

Section: Introductionmentioning

confidence: 99%

Shallow lakes at risk: Nutrient enrichment enhances top‐down control of macrophytes by invasive herbivorous snails

Liu

Hilt

et al. 2020

Freshwater Biology

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In shallow lakes, submerged macrophytes can stabilise clear‐water conditions and prevent phytoplankton blooms. Nutrient enrichment can promote their abundance. Above critical thresholds in water nutrient concentrations, however, submerged macrophytes have collapsed in many lakes worldwide with negative consequences for important ecosystem functions. The mechanisms behind this decline are complex and subject to debate. We conducted mesocosm and laboratory experiments to investigate the top‐down effect of invasive herbivorous snails (Pomacea canaliculata) on native submerged macrophytes (Vallisneria natans) under low and moderate nutrient treatment. We tested whether effects of nutrient addition to the water column on snail herbivory were influenced by shading by phytoplankton and epiphyton, macrophyte elemental tissue content and snail nutrient release. We found that herbivorous snails had strong negative top‐down effects on macrophytes, which were amplified by nutrient enrichment in the water column leading to higher macrophyte consumption rates. In moderate nutrient treatment, macrophyte consumption was faster and snails grew better than in low nutrient treatment. Additionally, snail treatments had higher nitrogen concentrations in the water leading to a negative feedback loop. Our results suggest that snail herbivory may increase the chance for macrophyte collapse and shifts of shallow lakes to turbid states, and this effect occurs at lower snail densities when nutrient concentrations increase. Shallow lakes are thus severely at risk from projected increases in nutrient loading and spread of invasive herbivorous molluscs.

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Interactive effects of light and snail herbivory rather than nutrient loading determine early establishment of submerged macrophytes

Feng

Zhang

Cheng

et al. 2022

Ecology and Evolution

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Submerged macrophytes play a key role in maintaining a clear‐water phase and promoting biodiversity in shallow aquatic ecosystems. Since their abundance has declined globally due to anthropogenic activities, it is important to include them in aquatic ecosystem restoration programs. Macrophytes establishment in early spring is crucial for the subsequent growth of other warm‐adapted macrophytes. However, factors affecting this early establishment of submerged macrophytes have not been fully explored yet. Here, we conducted an outdoor experiment from winter to early spring using the submerged macrophytes Potamogeton crispus and Vallisneria spinulosa to study the effects of shading, nutrient loading, snail herbivory (Radix swinhoei), and their interactions on the early growth and stoichiometric characteristics of macrophytes. The results show that the effects strongly depend on macrophyte species. Biomass and number of shoots of P. crispus decreased, and internode length increased during low light conditions, but were not affected by nutrient loading. P. crispus shoot biomass and number showed hump‐shaped responses to increased snail biomass under full light. In contrast, the biomass of the plant linearly decreased with snail biomass under low light. This indicates an interaction of light with snail herbivory. Since snails prefer grazing on periphyton over macrophytes, a low density of snails promoted growth of P. crispus by removing periphyton competition, while herbivory on the macrophyte increased during a high density of snails. The growth of V. spinulosa was not affected by any of the factors, probably because of growth limitation by low temperature. Our study demonstrates that the interaction of light with snail herbivory may affect establishment and growth of submerged macrophytes in early spring. Macrophyte restoration projects may thus benefit from lowering water levels to increase light availability and making smart use of cold‐adapted herbivores to reduce light competition with periphyton.

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Interactive Effects of Rising Temperature and Nutrient Enrichment on Aquatic Plant Growth, Stoichiometry, and Palatability

Cited by 36 publications

References 84 publications

Impact of nutrients and water level changes on submerged macrophytes along a temperature gradient: A pan‐European mesocosm experiment

Impact of nutrients and water level changes on submerged macrophytes along a temperature gradient: A pan‐European mesocosm experiment

Shallow lakes at risk: Nutrient enrichment enhances top‐down control of macrophytes by invasive herbivorous snails

Interactive effects of light and snail herbivory rather than nutrient loading determine early establishment of submerged macrophytes

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