The biogeochemistry of photosynthetic pigments in the Jiulong River estuary and Western Xiamen Bay

Xu, Li; Hong, Huasheng; Wang, Haili; Chen, Weiqi

doi:10.1007/bf02863042

Cited by 6 publications

(6 citation statements)

References 10 publications

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“…The phenomenon of high values of urea uptake at the sea end did not disappear after normalization (normalize to PN as in Figure S9 and to Chl a as in Figure 5), but became more pronounced, showing that biomass is probably not the cause. Past studies have suggested that the phytoplankton of the JRE is dominated by diatoms (Xu et al, 2001;Xie et al, 2019). Fucoxanthin, a characteristic pigment of diatoms, was found to be almost dominant in the Xiamen Bay and JRE from upstream to downstream (Xu et al, 2001).…”

Section: The Potential Inhibition-like Effect Of Ammonium On Urea Uti...mentioning

confidence: 91%

The biological transformation of ammonium and urea in a eutrophic estuarine system in Southern China

Tang

Lin

et al. 2022

Front. Mar. Sci.

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Estuaries channel large amounts of anthropogenic nitrogen (N) from continents to the offshore where productivity is widely limited by N and phosphorus. Ammonium and urea, two reduced forms of anthropogenic N commonly observed, are the preferred substrates for various microorganisms (e.g., uptake by phytoplankton or bacteria and oxidation by nitrifier). Yet, it remains underexplored how they transform and their concentrations vary during transport in the estuary which may influence the offshore microbial community. We applied 15N isotope tracer incubation techniques to determine the two main bio-consumption processes, i.e., uptake and oxidation, of ammonium and urea, in the dark for the Jiulong River Estuary, a eutrophic estuary in southeastern China. Results showed that light penetration depth ranged from 0.8-3.3 m leaving 76% of estuary water bodies to stay in dark situations throughout a day. Ammonia oxidation, which favors dark conditions, dominates the estuarine regenerated-N cycle, showing the rank: ammonia oxidation > ammonium uptake >> urea uptake ≈ urea oxidation. By compiling the reported case studies, we found the relatively low ratio of urea oxidation to ammonia oxidation was accompanied by a relatively high ammonium concentration. Microorganisms’ high preference for ammonium over urea may lead to an inhibitory-like phenomenon. An analogous effect was evident by the increased urea uptake at downstream when ammonium was down to a few µM. The obstructed urea utilization resulted in 10 times longer lifetime for urea relative to ammonium (surface: 19 ± 9 days; bottom 12 ± 7 days). Such an inhibitory-like effect allows urea to be preserved in the estuary and allows urea to be transported farther offshore to stimulate microorganisms capable of utilizing urea, which may have significant impacts on offshore ecology.

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Section: The Potential Inhibition-like Effect Of Ammonium On Urea Uti...mentioning

confidence: 91%

The biological transformation of ammonium and urea in a eutrophic estuarine system in Southern China

Tang

Lin

et al. 2022

Front. Mar. Sci.

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“…Their sampling site was located between stations 11 and 14 of our investigation. The diagnostic pigments of Diatoms, Dinophyceae, Chrysophyceae, Chlorophyceae, Cryptophyceae, Cyanophyceae were detected in the samples collected from the East China Sea, Xiamen sea area and Taiwan Strait, but no diagnostic pigments of prasinoxanthin-containing Prasinophyceae were found (Wang and Hong 2000;Peng et al 2001;Xu et al 2001;Jiao and Yang 2002;Chen et al 2003;Furuya et al 2003;Wong and Wong 2003). We detected prasinoxanthin and other diagnostic pigments of prasinoxanthin-containing Prasinophyceae in Jiaozhou Bay and this is the first finding of this kind in Chinese sea areas.…”

Section: ) Prasinococcus Has Been Observed and Is Suspected To Bmentioning

confidence: 94%

“…In recent years, more and more researchers have used high performance liquid chromatography (HPLC) pigment analysis method for studies of the composition and abundance of phytoplankton in Chinese sea areas. However, prasinoxanthin were not yet detected in the samples collected from the East China Sea, Taiwan Strait, Xiamen and Hong Kong sea area (Wang and Hong 2000;Peng et al 2001;Xu et al 2001;Jiao and Yang 2002;Chen et al 2003;Furuya et al 2003;Wong and Wong 2003). Therefore, the distribution and quantities of prasinoxanthin-containing Prasinophyceae in Chinese seas are unknown.…”

mentioning

confidence: 93%

Prasinoxanthin‐constaining Prasinophyceae Discovered in Jiaozhou Bay, China

Deng

Yao

et al. 2007

JIPB

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The class Prasinophyceae (Chlorophyta) contains some photosynthetic eukaryotic ultraplankton species characterized by containing prasinoxanthin. The existence and abundance of these organisms can be estimated by the diagnostic pigment. We detected the unique pigments of prasinoxanthin-containing Prasinophyceae in Jiaozhou Bay, China using high performance liquid chromatography (HPLC). This was the first finding of this kind in Chinese seas. Using the ratio of prasinoxanthin to chlorophyll a, the abundance of prasinoxanthin-containing Prasinophyceae has been calculated. The average contribution of prasinoxanthin-containing Prasinophyceae to the chlorophyll a pool was 8.5% and 17.0% in May and August 2004 in Jiaozhou Bay, and the maximums were 25.9% and 36.3%. Size fractionated pigment analysis suggested that more than 80% of prasinoxanthin were in the fraction of 2-20 μ μ μ μ μm. According to the results of pigment and morphological analysis, the possible genera of prasinoxanthin-containing Prasinophyceae and the reasons for causing this high abundant phytoplankton in Jiaozhou Bay were discussed. This kind of phytoplankton can not be discovered in traditional biological investigation, but its contribution to the coastal ecosystem is significant enough to be studied further.

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“…But these two pigments were not found in another similar study conducted in 1995 (Xu et al . ), or at least not all the stations in Xiamen Bay (Chen et al . ).…”

Section: Methodsmentioning

confidence: 99%

“…Some previous studies were conducted in the Jiulong River estuary and adjacent Xiamen Bay using HPLC and CHEMTAX to examine the phytoplankton composition (Xu et al . ; Chen et al . ; He & Peng ), but there has been no similar study conducted on the MPB.…”

Section: Introductionmentioning

confidence: 99%

Contrasting responses of intertidal microphytobenthos and phytoplankton biomass and taxonomic composition to the nutrient loads in the Jiulong River Estuary

Xie

Wang

Liu

et al. 2018

Phycological Research

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Microphytobenthos (MPB) and phytoplankton are important primary producers in the estuarial ecosystem, and their functions are critical to the ecosystem's biodiversity and environmental safety. The aim of this study was to compare the response of MPB and phytoplankton to the nutrient loads in a eutrophic estuary, which has seldom been studied. We used high-performance liquid chromatography (HPLC) and CHEM-TAX software to examine the biomass and taxonomic composition of both MPB and phytoplankton at Da-yu Island (DYI) and Ji-yu Island (JYI) in the Jiulong River Estuary from July 2010 to March 2012. The results showed that MPB chlorophyll a was low in the summer and high in the winter at both DYI and JYI, indicating a unimodal pattern. However, the phytoplankton chlorophyll a showed a mirrored pattern. Diatoms were the dominant class in both benthic and pelagic environments. Although redundancy analysis indicated that the effects of different environmental factors could not be easily separated, it is likely that phosphate and temperature were the most important factors regulating the seasonal patterns of MPB and phytoplankton diatoms, respectively. MPB and phytoplankton cyanobacteria was co-limited by salinity and temperature. The high N/P ratio and low phosphate favored chlorophytes and cyanobacteria. Our study demonstrates the use of HPLC and CHEMTAX in an integrated survey of the spatial and temporal distribution patterns of MPB and phytoplankton in an estuarial ecosystem. The contrasting responses of MPB and phytoplankton to nutrient loads indicate the critical role of MPB in subtropical estuarial ecosystem function. The relationship between nutrients and MPB may indicate a significant contribution to carbon and nutrient cycling.

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The biogeochemistry of photosynthetic pigments in the Jiulong River estuary and Western Xiamen Bay

Cited by 6 publications

References 10 publications

The biological transformation of ammonium and urea in a eutrophic estuarine system in Southern China

The biological transformation of ammonium and urea in a eutrophic estuarine system in Southern China

Prasinoxanthin‐constaining Prasinophyceae Discovered in Jiaozhou Bay, China

Contrasting responses of intertidal microphytobenthos and phytoplankton biomass and taxonomic composition to the nutrient loads in the Jiulong River Estuary

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