Influence of Mowing Down Floating-Leaved Plants on Water Body Structure in Lake Suwa

Toyota, Masashi; Kato, Hiroaki; Imai, Akiko; Miyabara, Yuichi

doi:10.2208/jscejhe.67.i_1465

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…However, since 2005, water chestnut (Trapa sp. ), a floating-leaved plant, has dominated in the coastal area in summer, covering nearly 20% of the lake surface [49]. A luxuriant growth of Trapa sp.…”

Section: Discussionmentioning

confidence: 99%

Temporal Phosphorus Dynamics in Shallow Eutrophic Lake Suwa, Japan

Ichikawa,

Kunito,

Miyabara

2024

Water

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It can be difficult to decrease the water phosphorus (P) concentration in eutrophic shallow lakes, even if the external P loading is reduced, owing to a high level of internal P loading to surface water from sediment. However, in shallow Lake Suwa, Japan, lake water P concentration has largely decreased in recent years owing to low levels of internal P loading, as well as declining external P loading. We measured water/sediment P and iron (Fe) concentrations and the P release rate from sediment in Lake Suwa, and then compared it with data from the 1970s. In the 1970s, the P concentration throughout the lake water was high during the hypoxic period. Recently, however, the P concentration has increased only in the hypolimnion during the hypoxic period. This suggests that internal P loading from sediment to surface water has largely been suppressed during the hypoxic period in recent years. This may be due to (i) stronger water stratification from global warming, (ii) a greater decrease in the P release rate from the sediment owing to a decline in sediment P concentration from the 1970s to 2020, and (iii) stronger formation of the Fe–P cycle in Lake Suwa recently, compared with that in the 1970s. Our results indicated the need to reduce both external P loading, and internal P loading from sediment to water, for effective water quality improvement in shallow lakes.

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Section: Discussionmentioning

confidence: 99%

Temporal Phosphorus Dynamics in Shallow Eutrophic Lake Suwa, Japan

Ichikawa,

Kunito,

Miyabara

2024

Water

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“…Trapa japonica , a common annual floating‐leaved macrophyte, commonly occurs in Asian shallow and eutrophic lakes along the lakeshore from summer to autumn (Yasuda et al, ). T. japonica bed restrict boat navigation (Toyota, Kato, Imai, & Miyabara, ) and induce hypoxia under the leaves (Frodge, Thomas, & Pauley, ; Hummel & Findlay, ; Yamanaka, ). In Lake Suwa, Japan, T. japonica beds coverage reaches approximately 20% of the lake surface (Toyota et al, ) and results in a large amount of biomass (~500 t in the entire lake, Takei Kaoru, personal communication, November 29, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…T. japonica bed restrict boat navigation (Toyota, Kato, Imai, & Miyabara, ) and induce hypoxia under the leaves (Frodge, Thomas, & Pauley, ; Hummel & Findlay, ; Yamanaka, ). In Lake Suwa, Japan, T. japonica beds coverage reaches approximately 20% of the lake surface (Toyota et al, ) and results in a large amount of biomass (~500 t in the entire lake, Takei Kaoru, personal communication, November 29, 2009). Rahman, Mosaddik, Wahed, and Haque () demonstrated that Trapa bispinosa extracts exert antimicrobial activity against Gram‐positive bacteria.…”

Section: Introductionmentioning

confidence: 99%

Water‐soluble bioactive natural compounds in Trapa japonica leaves: Temporal changes in chemical composition and effects on cladocerans

Ishimota

Nakajima

Sakamoto

et al. 2019

Ecological Research

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Littoral macrophyte vegetation provides a refuge for zooplankton from fish under certain circumstances. However, some chemicals produced by macrophytes harm zooplankton. Trapa japonica, a common annual floating-leaved macrophyte, commonly occurs in Asian shallow and eutrophic lakes. In this study, we conducted preliminary evaluation of the adverse effects of T. japonica leaf extracts on Daphnia magna survival. Specifically, we investigated the effects of lake water to D. magna in relation to T. japonica abundance. The effect of littoral water samples peaked when the density of the macrophyte leaves began to decline. These findings coincided with those of acute immobilization tests of leaf extracts that had substances from leaves in the early yellowing stage showed strongest effect to the cladocerans, D. magna and Scapholeberis kingi. Moreover, the ion composition and amount of each ion varied depending on the leaf stage. Additionally, the multimodel inference approach showed that leaf extract effects depend on the total amount of the chemicals. Our findings indicate that the littoral macrophytes have unintended effects on zooplankton due to those differential decomposition.

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Influence of Mowing Down Floating-Leaved Plants on Water Body Structure in Lake Suwa

Cited by 2 publications

References 5 publications

Temporal Phosphorus Dynamics in Shallow Eutrophic Lake Suwa, Japan

Temporal Phosphorus Dynamics in Shallow Eutrophic Lake Suwa, Japan

Water‐soluble bioactive natural compounds in Trapa japonica leaves: Temporal changes in chemical composition and effects on cladocerans

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