Relationship between dissolved organic matter and phytoplankton community dynamics in a human-impacted subtropical river

Liu, Qi; Tian, Yulu; Liu, Yang; Yu, Mei; Hou, Zhaojiang; He, Kai; Xu, Hui; Cui, Baoshan; Jiang, Yuan

doi:10.1016/j.jclepro.2020.125144

Cited by 34 publications

(8 citation statements)

References 44 publications

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“…The authors concluded that the potential for bloom formation occurs even with low to intermediate values of inorganic nutrients (surface nitrate occasionally reaches 0.2 µM) when relative availability of dissolved organic matter (DOM) is high. This is supported by a significant correlation between DOM concentrations and abundance of bloom species, hence DOM is considered as an alternative nutrient source that may enhance the bloom formation, in particular in the case of dinoflagellates (Glibert et al 2001), which is consistent with other studies (Tas & Yilmaz 2015;Liu et al 2020). Phytoplankton autochthonous exudations, such as DFAA, have been identified as important contributors of DOM (Yamamoto et al 2004;Thornton 2014;Burpee et al 2016).…”

Section: Ecological Significance: Emphasis On Bloom Formationsupporting

confidence: 81%

Intercellular and extracellular amino acids of different bloom species in the Mediterranean Sea

Hosny

El‐Sheekh

Labib

2022

OandHS

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The presented laboratory experiment was designed to characterize the quantity and compositional variation of algal extracellular amino acids (AAs) that may represent an alternative nutrient source in a natural environment. To resemble algal bloom scenarios, analyses were conducted in mono- and/or co-cultures of the bloom-forming species Skeletonema costatum, Scrippsiella trochoidea, Ulva fasciata, and Corallina officinalis during their active growth phase. The study revealed that S. costatum exhibited higher production of the dominant AAs than S. trochoidea. Alanine, lysine, and threonine acids are the dominant amino acids in S. costatum and S. trochoidea filtrates, which may play a role in mucus formation during mucosal phytoplankton blooms with negative ecological effects. On the other hand, aspartic, glutamine, alanine, and leucine acids are the dominant amino acids in macroalgae. In co-culture experiments, U. fasciata shows strong and rapid allelopathic activity against these two potentially harmful species. The AA production offers an advantage to species with the capacity to absorb them to form blooms. Thus, anthropogenic inorganic nutrient inputs may be less important for the development of algal blooms in coastal waters. A major difference that distinguishes this work from others is the use of specific multi-taxa cultures of phytoplankton and macroalgae. The study represents a new research effort in Alexandria waters.

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Section: Ecological Significance: Emphasis On Bloom Formationsupporting

confidence: 81%

Intercellular and extracellular amino acids of different bloom species in the Mediterranean Sea

Hosny

El‐Sheekh

Labib

2022

OandHS

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“…Due to the dual threats of climate change and human activities, most river ecosystems in the world are currently being damaged to varying degrees [1][2][3]. Land use has been proven to be one of the most significant human activities affecting river ecosystems [4,5].…”

Section: Introductionmentioning

confidence: 99%

Catchment versus Riparian Buffers: Which Land Use Spatial Scales Have the Greatest Ability to Explain Water Quality Changes in a Typical Temperate Watershed?

Song

Jiang

Liu

et al. 2021

Water

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Identifying the multi-scale spatial relationship between land use and water quality is critical for determining the priorities and key areas of river management. To more accurately identify the scale effect of land-use patterns on water quality and quantitatively distinguish the difference in the impacts of land-use composition and configuration on water quality, we used 94 sites to extract the upstream catchment and riparian buffer zone with different widths. The results showed that the ability of land use variables with different buffer widths to explain water quality differed slightly from the ability of these variables at the catchment scale, and the joint explanatory ability of land use composition and configuration was greater than that of each individually. The patch density and landscape shape index of cultivated land, shrubland, and built-up land in the buffer area close to the water bodies were the main factors for the increase in the concentration of total nitrogen, nitrate nitrogen, total phosphorus, and suspended solids. As the width of the buffer increased, the role of the percent of land use increased. Our research indicates that water quality management needs to adopt a multi-scale perspective and focus on key local areas while coordinating at a broader scale.

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“…Dissolved organic matter (DOM) is ubiquitous in natural waters and plays a fundamental role in biogeochemical processes of lakes (Singh et al, 2017), such as cycling of carbon, nitrogen, and phosphorous (Li et al, 2020), fate of organic pollutants and trace metals (Yan and Korshin, 2014), and growth of benthic algae or bacteria (Liu et al, 2021;Gao et al, 2022). Concentrations of DOM in sediment pore water are normally orders of magnitude higher than those in overlying water, serving as an important source of DOM input into water column, especially in shallow lakes (Zhu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Effects of drought-rewetting process and salinity variations on DOM transformation and bacterial communities in lacustrine sediments

Zhu

Xie

et al. 2023

Preprint

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Climate change and anthropogenic activities cause salinity fluctuations and frequent drought-rewetting process in lacustrine littoral zones. However, joint effects of these processes on quality and quantity of dissolved organic matter (DOM) in pore water and bacterial communities in sediments are not well understood. An experiment was conducted to attempt to fill the above gaps, the results showed that the joint effects of higher salinity (6,000 mg/L) and drought-rewetting process were to retain more humified, more aromatic, and less bioavailable DOM, and to maintain lower DOM concentrations in pore water. The drought-rewetting process magnified influence of salinity on bacterial communities. Before the drought-rewetting process, Hydrogenophilaceae, Oxalobacteraceae, and Flavobacteriaceae participated in the DOM transformation, while Hydrogenophilaceae, Desulfobacteraceae, Anaerolineacea, Planococcaceae, and Clostridiaceae were associated with DOM components after this process. The drought-rewetting process greatly increased significant positive correlations (P<0.05) among bacteria, which was consistent with Stress Gradient Hypothesis and destabilized the bacterial communities. Higher (6,000 mg/L) or lower (1,200 mg/L) salinity were all not conducive to stability of bacterial communities in Shahu Lake. The results of this study may provide ideas for further investigating DOM transformation and cycling in brackish-water lakes.

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Relationship between dissolved organic matter and phytoplankton community dynamics in a human-impacted subtropical river

Cited by 34 publications

References 44 publications

Intercellular and extracellular amino acids of different bloom species in the Mediterranean Sea

Intercellular and extracellular amino acids of different bloom species in the Mediterranean Sea

Catchment versus Riparian Buffers: Which Land Use Spatial Scales Have the Greatest Ability to Explain Water Quality Changes in a Typical Temperate Watershed?

Effects of drought-rewetting process and salinity variations on DOM transformation and bacterial communities in lacustrine sediments

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