An enzymatic mechanism for balancing the stoichiometry of nitrogen and phosphorus in a shallow Chinese eutrophic lake

Xiao, Jiangjian; Wang, Siyang; Zhou, Zijun; Zhang, Yao; Song, Changchun; Zhou, Yiyong; Cao, Xiuyun

doi:10.1016/j.scitotenv.2018.02.297

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…The isotopic nitrogen, as well as the C:N ratio, are key indicators for bottom-up energy-matter transfer efficiency in the food web. 42 Phytoplankton quickly responded to changes in nitrogen concentrations and enriched organic nitrogen via extracellular aminopeptidase within 3 h. 43 However, due to differences in nitrogen metabolism, 26 fish exhibited both intra-and interspecific variations in the turnover rates over timescales from weeks to months. In the present study, elevations in nitrogen availability driving phytoplankton and detritus exerted bottomup forces of the aquatic food web through secondary producers, including zooplankton, zoobenthos, shrimp, and forage fish.…”

Section: Discussionmentioning

confidence: 99%

“…The isotopic nitrogen, as well as the C:N ratio, are key indicators for bottom-up energy-matter transfer efficiency in the food web . Phytoplankton quickly responded to changes in nitrogen concentrations and enriched organic nitrogen via extracellular aminopeptidase within 3 h . However, due to differences in nitrogen metabolism, fish exhibited both intra- and inter-specific variations in the turnover rates over timescales from weeks to months.…”

Section: Discussionmentioning

confidence: 99%

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Supporting Evidence for the “Ten-Year Fishing Ban”: Different Modes of Fishing and Pollution Induce a Fish Diversity Decline between the Pearl River and Its Estuary

et al. 2023

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To settle the emerging debate on whether a "ten-year fishing ban" is too long or an annual fishing moratorium is enough for fish resource restoration in the Yangtze River, a long-term comparison between the 1980s and the 2020s in the Pearl River was performed. Significant declines in fish biodiversity were determined among both the Pearl River and its estuary over the past decades. The trophic level increased from 4 to 5 in the estuary, whereas it remained at 4 in the Pearl River. Interestingly, an opposite trend in interspecies networks of fish was observed between the Pearl River and its estuary. A reduced density and increased links were detected in the Pearl River as its interspecies networks became complex, which was in contrast to that in the estuary. Furthermore, fishing and pollution were both confirmed to participate in the fish biodiversity decline in the Pearl River, whereas pollution was the dominant factor inducing the fish biodiversity decline in the estuary. Our case indicated that an annual fishing moratorium is not enough for fish resource restoration and supports the strategy of "ten-year fishing ban". Moreover, pollution should also be brought under control so that we can facilitate fish resource restoration.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Supporting Evidence for the “Ten-Year Fishing Ban”: Different Modes of Fishing and Pollution Induce a Fish Diversity Decline between the Pearl River and Its Estuary

et al. 2023

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“…The EEA was finally expressed as nanomoles of substrate released per hour per gram of dry sediment (nmol g sediment –1 h –1 ). So far, the sediment studies on EEAs and ecoenzymatic stoichiometry are mainly focused on freshwater ecosystems ( Sinsabaugh et al, 2009 , 2012 ; Xiao et al, 2018 ; Kohler et al, 2020 ), while lack in saline lakes especially lakes in Qinghai-Tibet Plateau. Thus, to recognize the status and characteristics of EEAs and ecoenzymatic stoichiometry of Qinghai Lake sediment, we compared them with those in typical freshwater lakes across China, including Fuxian Lake in the southwestern Yunnan-Guizhou Plateau, 38 shallow lakes in the Yangtze–Huaihe River basin (unpublished data) and Hulun Lake in the northern semiarid area ( Zhang et al, 2021a ).…”

Section: Methodsmentioning

confidence: 99%

Extracellular enzyme stoichiometry reveals carbon and nitrogen limitations closely linked to bacterial communities in China’s largest saline lake

et al. 2022

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Saline lakes possess substantial carbon storage and play essential roles in global carbon cycling. Benthic microorganisms mine and decompose sediment organic matter via extracellular enzymes to acquire limiting nutrients and thus meet their element budgets, which ultimately causes variations in sediment carbon storage. However, current knowledge about microbial nutrient limitation and the associated organic carbon changes especially in saline lake remains elusive. Therefore, we took Qinghai Lake, the largest saline lake of China, as an example to identify the patterns and drivers of microbial metabolic limitations quantified by the vector analyses of extracellular enzyme stoichiometry. Benthic microorganisms were dominantly colimited by carbon (C) and nitrogen (N). Such microbial C limitation was aggravated upon the increases in water salinity and sediment total phosphorus, which suggests that sediment C loss would be elevated when the lake water is concentrated (increasing salinity) and phosphorus becomes enriched under climate change and nutrient pollution, respectively. Microbial N limitation was predominantly intensified by water total nitrogen and inhibited by C limitation. Among the microbial drivers of extracellular enzyme investments, bacterial community structure consistently exerted significant effects on the C, N, and P cycles and microbial C and N limitations, while fungi only altered the P cycle through species richness. These findings advance our knowledge of microbial metabolic limitation in saline lakes, which will provide insights towards a better understanding of global sediment C storage dynamics under climate warming and intensified human activity.

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“…K m is used to measure the affinity between enzyme and substrate (Tischer et al 2015). A smaller K m value represents a stronger affinity (Wang et al 2006;Xiao et al 2018). The temporal patterns showed that Affinity between AP and substrate in the inflowing rivers during high flow period was higher than that during low and moderate flow periods.…”

Section: Characteristics Of Ap In the Inflowing Rivers Of Taihumentioning

confidence: 99%

A study of bioavailable phosphorus in the inflowing rivers of Lake Taihu, China

et al. 2019

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Phosphorus (P) is a vital nutrient for algal growth. Aside from soluble reactive P (SRP), organic P (OP) is used by algae via alkaline phosphatase (AP) hydrolysis, which can play an important role in supplying P. Enzymatically-hydrolysable OP (EHP) can potentially be used as an indicator of bioavailability of P other than SRP in natural waters. We investigated the ecological significance of alkaline phosphatase activity (APA), EHP concentration and P turnover time in the inflowing rivers of Lake Taihu (Taihu) during three hydrologic periods. Results indicated high SRP concentration and low SRP demand by algal suppressed APA in the inflowing rivers, the highest proportion of OP mineralization rate (v) to the maximum reaction velocity of AP (V max ) is only 14.7%. P turnover time of the inflowing rivers was generally from 3 to 7 days and in exceptional cases, it could exceed 10 days. The high EHP reserve and the sufficient AP for OP mineralization render the rivers a significant source of utilizable OP, further exacerbating eutrophication of Taihu.

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An enzymatic mechanism for balancing the stoichiometry of nitrogen and phosphorus in a shallow Chinese eutrophic lake

Cited by 13 publications

References 40 publications

Supporting Evidence for the “Ten-Year Fishing Ban”: Different Modes of Fishing and Pollution Induce a Fish Diversity Decline between the Pearl River and Its Estuary

Supporting Evidence for the “Ten-Year Fishing Ban”: Different Modes of Fishing and Pollution Induce a Fish Diversity Decline between the Pearl River and Its Estuary

Extracellular enzyme stoichiometry reveals carbon and nitrogen limitations closely linked to bacterial communities in China’s largest saline lake

A study of bioavailable phosphorus in the inflowing rivers of Lake Taihu, China

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