Allelopathic effects of submerged macrophytes on phytoplankton

Eigemann, Falk

doi:10.26651/2017-40-1-1062

Cited by 29 publications

(10 citation statements)

References 145 publications

(154 reference statements)

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“…Furthermore, macrophytes may influence sinking losses (i.e. the sinking velocity of algae divided by the thickness of the epilimnion), light conditions for phytoplankton and produce allelopathic substances (Gao et al ., 2017).…”

Section: Introductionmentioning

confidence: 99%

Direct and indirect effects of climate change on distribution and community composition of macrophytes in lentic systems

2022

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Macrophytes are an important part of freshwater ecosystems and they have direct and indirect roles in keeping the water clear and providing structure and habitats for other aquatic organisms. Currently, climate change is posing a major threat to macrophyte communities by altering the many drivers that determine macrophyte abundance and composition. We synthesise current literature to examine the direct effects of climate change (i.e. changes in CO 2 , temperature, and precipitation patterns) on aquatic macrophytes in lakes as well as indirect effects via invasive species and nutrient dynamics. The combined effects of climate change are likely to lead to an increased abundance and distribution of emergent and floating species, and a decreased abundance and distribution of submerged macrophytes. In small shallow lakes, these processes are likely to be faster than in deep temperate lakes; with lower light levels, water level fluctuations and increases in temperature, the systems will become dominated by algae. In general, specialized macrophyte species in high-latitude and high-altitude areas will decrease in number while more competitive invasive species are likely to outcompete native species. Given that the majority of endemic species reside in tropical lakes, climate change, together with other anthropogenic pressures, might cause the extinction of a large number of endemic species. Lakes at higher altitudes in tropical areas could therefore potentially be a hotspot for future conservation efforts for protecting endemic macrophyte species. In response to a combination of climate-change induced threats, the macrophyte community might collapse, which will change the status of lakes and may initiate a negative feedback loop that will affect entire lake ecosystems.

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Section: Introductionmentioning

confidence: 99%

Direct and indirect effects of climate change on distribution and community composition of macrophytes in lentic systems

2022

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“…Polyphenols are well known secondary metabolites in the plant kingdom not only because of their possible health benefits arising from such as their antioxidant activity, antimicrobial capacity and anticancer property (Belščak-Cvitanović et al, 2018;Bouarab-Chibane et al, 2019;Álvarez-Martínez et al, 2020), but also because of their allelopathic inhibition on nuisance phytoplankton in the aquatic ecosystem (Gao et al, 2017;Tan et al, 2019). Many polyphenols, such as pyrogallic acid (PA), gallic acid (GA), ellagic acid (EA), and (+)-catechin (CA), have been identified in aquatic plants (Nakai et al, 2000;Olate-Gallegos et al, 2019;Zolotareva et al, 2019), and confirmed evidently to have allelopathic inhibition against various cyanobacteria (Huang et al, 2016;Techer et al, 2016;Yu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…It is all known that aquatic plants can release different types of allelochemical into the environment, and their contents and compositions are different for distinct aquatic plants (Tan et al, 2019). There is growing evidence that the combined effects of allelochemicals play an important role in the allelopathy of aquatic plants, and may help to reveal the mechanism of allelopathy in natural aquatic ecosystems (Gao et al, 2015(Gao et al, , 2017. A variety of Abbreviations: CFPs, chlorophyll fluorescence parameters; YII, the effective quantum yield of photochemical energy conversion in photosystem II (PSII); q P , a parameter estimating the fraction of PSII centers in open states based on a puddle model for the photosynthetic unit; q L , a parameter estimating the fraction of PSII centers in open states based on a lake model for the photosynthetic unit; q P(rel) , relative photochemical quenching; NPQ, light induced photoprotection through thermal dissipation of energy in the antenna system; q N , light induced photoprotection through thermal dissipation of energy in thylakoid membrane; q N(rel) , relative non-photochemical quenching; q CN , complete non-photochemical quenching; q TQ , total quenching; F v /F m , the maximum quantum yield of PSII photochemistry; F' v /F' m , the effective quantum yield of PSII photochemistry; UQF (rel) , relative unquenched fluorescence; EC 50 , the higher 50% effective concentrations; TI, toxicity index; TU, toxic unit.…”

Section: Introductionmentioning

confidence: 99%

Combined Effects of Allelopathic Polyphenols on Microcystis aeruginosa and Response of Different Chlorophyll Fluorescence Parameters

Huang

Zhu

et al. 2020

Front. Microbiol.

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Polyphenols are allelochemicals secreted by aquatic plants that effectively control cyanobacteria blooms. In this study, sensitive response parameters (including CFPs) of Microcystis aeruginosa were explored under the stress of different polyphenols individually and their combination. The combined effects on M. aeruginosa were investigated based on the most sensitive parameter and cell densities. For pyrogallic acid (PA) and gallic acid (GA), the sensitivity order of parameters based on the EC50 values (from 0.73 to 3.40 mg L–1 for PA and from 1.05 to 2.68 mg L–1 for GA) and the results of the hierarchical cluster analysis showed that non-photochemical quenching parameters [NPQ, qN, qN(rel) and qCN] > photochemical quenching parameters [YII, qP, qP(rel) and qL] or others [Fv/Fm, F’v/F’m, qTQ and UQF(rel)] > cell densities. CFPs were not sensitive to ellagic acid (EA) and (+)-catechin (CA). The sensitivity order of parameters for M. aeruginosa with PA-GA mixture was similar to that under PA and GA stress. The quantitative (Toxicity Index, TI) and qualitative (Isobologram representation) methods were employed to evaluate the combined effects of PA, GA, and CA on M. aeruginosa based on cell densities and NPQ. TI values based on the EC50 cells suggested the additive effects of binary and multiple polyphenols, but synergistic and additive effects according to the EC50 NPQ (varied from 0.16 to 1.94). In terms of NPQ of M. aeruginosa, the binary polyphenols exhibited synergistic effects when the proportion of high toxic polyphenols PA or GA was lower than 40%, and the three polyphenols showed a synergistic effect only at the ratio of 1:1:1. Similar results were also found by isobologram representation. The results showed that increasing the ratio of high toxic polyphenols would not enhance the allelopathic effects, and the property, proportion and concentrations of polyphenols played an important role in the combined effects. Compared with cell densities, NPQ was a more suitable parameter as evaluating indicators in the combined effects of polyphenols on M. aeruginosa. These results could provide a method to screen the allelochemicals of polyphenols inhibiting cyanobacteria and improve the inhibitory effects by different polyphenols combined modes.

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“…The lower algae abundance among macrophytes compared to the open water zone could also be explained by competition between algae and macrophytes for light and nutrients 37 , 50 and/or with the secretion of allelopathic substances e.g. by Ceratophyllum demersum 51 inhibiting algal development. Our studies demonstrated that among chemical factors which clearly differentiated the two types of analysed habitat, TRP and NH 4 significantly influenced the distribution of chlorophyte dominating species.…”

Section: Discussionmentioning

confidence: 99%

Chlorophytes response to habitat complexity and human disturbance in the catchment of small and shallow aquatic systems

Celewicz-Gołdyn

Kozák

Kuczyńska‐Kippen

2022

Sci Rep

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Human-originated transformation in the catchment area may be reflected in the water quality and ecological state of the aquatic environment. Chlorophytes, the most common and diverse group of microalgae, may be a valuable tool for studies of small water bodies, ecosystems poorly recognized but extremely sensitive to the climate changes. Here we investigated the response of the chlorophytes to abiotic and biotic factors in different habitats and ponds’ catchments. Chlorophytes demonstrated a prevalence towards a specific type of catchment area. Field ponds supported chlorophytes typical for nutrient-rich/high-organic and shallow well-mixed waters. Forest ponds supported high chlorophyte diversity. A high importance of desmids, tolerant to light deficiency, confirms their preferences towards lower pH and lower trophic state in the forest ponds. Habitat type strongly impacted the distribution of chlorophytes. Great abundance and fertile-water species were associated with the open water, whereas aquatic plants hosted relatively low chlorophyte abundance which is a derivate of the filtrators grazing as well as the nutrient uptake and shadowing by macrophytes. Macrophyte-dominated zones created favorable conditions for some periphytic desmids and filamentous chlorophytes, species preferring lower trophic state and co-occurring with zooplankton. We assume that cosmopolitan chlorophytes can be adapted for determination of the ecological value of small water bodies, including the level of habitat heterogeneity. But chlorophytes clearly react to the level of human impact in the ponds’ catchment, both specific species and functional groups. Thus, we recommend them, particularly desmids, for water quality state assessment in ponds.

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Allelopathic effects of submerged macrophytes on phytoplankton

Cited by 29 publications

References 145 publications

Direct and indirect effects of climate change on distribution and community composition of macrophytes in lentic systems

Direct and indirect effects of climate change on distribution and community composition of macrophytes in lentic systems

Combined Effects of Allelopathic Polyphenols on Microcystis aeruginosa and Response of Different Chlorophyll Fluorescence Parameters

Chlorophytes response to habitat complexity and human disturbance in the catchment of small and shallow aquatic systems

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