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Article ; Online: Linkages between bacterial community and extracellular enzyme activities crossing a coastal front

Shujie Cai / Feipeng Wang / Edward A. Laws / Yao Liu / Chao Xu / Lingqi Ma / Wupeng Xiao / Bangqin Huang

Ecological Indicators, Vol 145, Iss , Pp 109639- (2022)

2022

Abstract: Exploring the responses of microbial communities and their functions to marine frontal systems are the foci of marine ecologists. However, most of the existing studies have focused on only microbial communities or their functions. The relationships ... ...

Abstract	Exploring the responses of microbial communities and their functions to marine frontal systems are the foci of marine ecologists. However, most of the existing studies have focused on only microbial communities or their functions. The relationships between microbial communities and their functions across coastal fronts therefore remain unclear. Here we studied a coastal front in the Taiwan Strait during late spring and examined the bacterial community structure, extracellular enzymatic activity (EEA), and their linkages. The results showed that the coastal front strongly delineated zones of bacterial community composition and diversity and functioned as a transitional zone rather than a hotspot between the coastal water and offshore water. Co-occurrence network analysis indicated that the interaction of bacterial communities was much weaker in the frontal zone than in the water masses on both sides. The suggestion was that the highly fluctuating environment in the frontal zone reduced the complexity and stability of the bacterial co-occurrence network. The activities of β-glucosidase (BGA) and leucine aminopeptidase (LAPA) were as high in the frontal zone as in the coastal water and much higher than those in offshore waters. We therefore suggest that, despite obvious shifts in the bacterial community structure in the frontal zone, the bacterial community was able to maintain its ability to hydrolyze organic substrates via functional redundancy. The composition of key microbial assemblies differed among the three water masses, and the relative abundance of module 2 in the frontal zone was positively correlated with BGA and LAPA. The indication was that changing the bacterial assemblage was the mechanism that made it possible for the bacterial community to maintain EEA in the frontal zone. Our results help to improve understanding on how bacterial community-function linkages vary in marine frontal systems.
Keywords	Coastal front ; Bacterioplankton community ; Extracellular enzymatic activity ; Co-occurrence network ; Functional redundancy ; Ecology ; QH540-549.5
Subject code	550 ; 551
Language	English
Publishing date	2022-12-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Patterns of Relative and Quantitative Abundances of Marine Bacteria in Surface Waters of the Subtropical Northwest Pacific Ocean Estimated With High-Throughput Quantification Sequencing

Jie Kong / Xin Liu / Lei Wang / Hao Huang / Danyun Ou / Jiayu Guo / Edward A. Laws / Bangqin Huang

Frontiers in Microbiology, Vol

2021 Volume 11

Abstract: Bacteria play a pivotal role in shaping ecosystems and contributing to elemental cycling and energy flow in the oceans. However, few studies have focused on bacteria at a trans-basin scale, and studies across the subtropical Northwest Pacific Ocean (NWPO) ...

Abstract	Bacteria play a pivotal role in shaping ecosystems and contributing to elemental cycling and energy flow in the oceans. However, few studies have focused on bacteria at a trans-basin scale, and studies across the subtropical Northwest Pacific Ocean (NWPO), one of the largest biomes on Earth, have been especially lacking. Although the recently developed high-throughput quantitative sequencing methodology can simultaneously provide information on relative abundance, quantitative abundance, and taxonomic affiliations, it has not been thoroughly evaluated. We collected surface seawater samples for high-throughput, quantitative sequencing of 16S rRNA genes on a transect across the subtropical NWPO to elucidate the distribution of bacterial taxa, patterns of their community structure, and the factors that are potentially important regulators of that structure. We used the quantitative and relative abundances of bacterial taxa to test hypotheses related to their ecology. Total 16S rRNA gene copies ranged from 1.86 × 108 to 1.14 × 109 copies L−1. Bacterial communities were distributed in distinct geographical patterns with spatially adjacent stations clustered together. Spatial considerations may be more important determinants of bacterial community structures than measured environmental variables. The quantitative and relative abundances of bacterial communities exhibited similar distribution patterns and potentially important determinants at the whole-community level, but inner-community connections and correlations with variables differed at subgroup levels. This study advanced understanding of the community structure and distribution patterns of marine bacteria as well as some potentially important determinants thereof in a subtropical oligotrophic ocean system. Results highlighted the importance of considering both the quantitative and relative abundances of members of marine bacterial communities.
Keywords	relative abundance ; bacterial community structure ; distribution patterns ; ecology of marine bacteria ; quantitative abundance ; Microbiology ; QR1-502
Subject code	551
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Examining the size-specific photosynthesis-irradiance parameters and relationship with phytoplankton types in a subtropical marginal sea

Haoran Liu / Yuyuan Xie / Yong Qiu / Lei Wang / Feipeng Wang / Edward A. Laws / Bangqin Huang

Ecological Indicators, Vol 130, Iss , Pp 108094- (2021)

2021

Abstract: Through photosynthesis, phytoplankton initiate material cycling and the flow of energy through marine ecosystems. The structure of marine ecosystems is sensitive to the size of primary producers, and size-specific photosynthesis-irradiance (P-I) ... ...

Abstract	Through photosynthesis, phytoplankton initiate material cycling and the flow of energy through marine ecosystems. The structure of marine ecosystems is sensitive to the size of primary producers, and size-specific photosynthesis-irradiance (P-I) parameters are required for modeling the size-specific primary production. We defined a phytoplankton type to be a group of phytoplankton communities with similar compositions and hypothesized that a function of phytoplankton types might be used to quantify systematic differences of P-I parameters between size classes (structural effects) and variations of the magnitudes of those parameters if the overlap between habitats was small (environmental effects). To test this hypothesis, we conducted a study to measure the size-specific P-I parameters of two size classes (<2 μm and >2 μm) and pigment-based phytoplankton community structure in a marginal sea, the Taiwan Strait. Three phytoplankton types were classified, and type-based and size-specific P-I parameters were derived. The results demonstrated the potential of a type-based model to estimate P-I parameters for two phytoplankton size classes as well as different habitats.
Keywords	Phytoplankton size class ; Phytoplankton type ; Primary production ; P-I parameters ; Taiwan Strait ; Marginal sea ; Ecology ; QH540-549.5
Subject code	333
Language	English
Publishing date	2021-11-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Coupling carbon and energy fluxes in the North Pacific Subtropical Gyre

Eric Grabowski / Ricardo M. Letelier / Edward A. Laws / David M. Karl

Nature Communications, Vol 10, Iss 1, Pp 1-

2019 Volume 9

Abstract: The biological pump is the key ecological component that links carbon and energy flow from oceanic surface waters to the abyss. Here the authors show that the elemental composition and energy content of sinking particulate matter can be used to develop a ...

Abstract	The biological pump is the key ecological component that links carbon and energy flow from oceanic surface waters to the abyss. Here the authors show that the elemental composition and energy content of sinking particulate matter can be used to develop a more comprehensive understanding of energy flow networks in the sea.
Keywords	Science ; Q
Language	English
Publishing date	2019-04-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Coupling carbon and energy fluxes in the North Pacific Subtropical Gyre

Eric Grabowski / Ricardo M. Letelier / Edward A. Laws / David M. Karl

Nature Communications, Vol 10, Iss 1, Pp 1-

2019 Volume 9

Abstract	The biological pump is the key ecological component that links carbon and energy flow from oceanic surface waters to the abyss. Here the authors show that the elemental composition and energy content of sinking particulate matter can be used to develop a more comprehensive understanding of energy flow networks in the sea.
Keywords	Science ; Q
Language	English
Publishing date	2019-04-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Surface sediment properties and heavy metal contamination assessment in river sediments of the Pearl River Delta, China

Zhao, Guangming / Edward A. Laws / Hongming Yuan / Jin Wang / Siyuan Ye / Xigui Ding

Marine pollution bulletin. 2018 Nov., v. 136

2018

Abstract: Concentrations of arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), lead (Pb), and zinc (Zn), grain sizes, and concentrations of organic carbon (Corg) were measured in 323 river sediment samples from the Pearl River Delta (PRD). ... ...

Abstract	Concentrations of arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), lead (Pb), and zinc (Zn), grain sizes, and concentrations of organic carbon (Corg) were measured in 323 river sediment samples from the Pearl River Delta (PRD). Results showed that the heavy metal concentrations in the sediments ranged from 1.6–93 mg/kg for As, 0.04–9.3 mg/kg for Cd, 2–315 mg/kg for Cr, 1.1–352 mg/kg for Cu, 0.01–0.67 mg/kg for Hg, 11–221 mg/kg for Pb, and 11–1234 mg/kg for Zn. The highest values of As, Cr, Cu, Hg, Pb, and Zn appeared in the Beijiang River, whereas Cd was high in the Xijiang River. The overall sediment quality in the area with respect to metal concentrations generally met the primary standard criteria of China (Marine Sediment Quality), except for Cd and Cu. The spatial distributions of the heavy metals were influenced by both grain sizes and Corg concentrations. The Igeo geo-accumulation index indicated that there was no significant Cr, Cu, Hg, or Zn pollution, slight to moderate pollution by As and Pb, and moderate Cd pollution in the study area. Spatial distributions of an eco-toxicological index based on probable effect levels indicated that there was a 21% probability that the combination of the seven metals was exerting a toxic stress in the PRD river sediments.
Keywords	arsenic ; cadmium ; chromium ; copper ; heavy metals ; lead ; marine sediments ; mercury ; organic carbon ; probability ; river deltas ; rivers ; toxicity ; water pollution ; zinc ; China
Language	English
Dates of publication	2018-11
Size	p. 300-308.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2001296-2
ISSN	1879-3363 ; 0025-326X
ISSN (online)	1879-3363
ISSN	0025-326X
DOI	10.1016/j.marpolbul.2018.09.035
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Patchiness of phytoplankton and primary production in Liaodong Bay, China.

Shaofeng Pei / Edward A Laws / Haibo Zhang / Siyuan Ye / Hongming Yuan / Haiyue Liu

PLoS ONE, Vol 12, Iss 2, p e

2017 Volume 0173067

Abstract: A comprehensive study of water quality, phytoplankton biomass, and photosynthetic rates in Liaodong Bay, China, during June and July of 2013 revealed two large patches of high biomass and production with dimensions on the order of 10 km. Nutrient ... ...

Abstract	A comprehensive study of water quality, phytoplankton biomass, and photosynthetic rates in Liaodong Bay, China, during June and July of 2013 revealed two large patches of high biomass and production with dimensions on the order of 10 km. Nutrient concentrations were above growth-rate-saturating concentrations throughout the bay, with the possible exception of phosphate at some stations. The presence of the patches therefore appeared to reflect the distribution of water temperature and variation of light penetration restricted by water turbidity. There was no patch of high phytoplankton biomass or production in a third, linear patch of water with characteristics suitable for rapid phytoplankton growth; the absence of a bloom in that patch likely reflected the fact that the width of the patch was less than the critical size required to overcome losses of phytoplankton to turbulent diffusion. The bottom waters of virtually all of the eastern half of the bay were below the depth of the mixed layer, and the lowest bottom water oxygen concentrations, 3-5 mg L-1, were found in that part of the bay. The water column in much of the remainder of the bay was within the mixed layer, and oxygen concentrations in both surface and bottom waters exceeded 5 mg L-1.
Keywords	Medicine ; R ; Science ; Q
Subject code	551
Language	English
Publishing date	2017-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Mercury and selenium levels, and Se:Hg molar ratios in freshwater fish from South Louisiana

Reyes-Avila, Alexander D / Edward A. Laws / Achim D. Herrmann / Ronald D. DeLaune / Thomas P. Blanchard

Journal of environmental science and health. 2019 Feb. 23, v. 54, no. 3

2019

Abstract: Ample historical evidence has demonstrated the neurotoxicity of organic Hg. However, several studies have suggested that Se effectively sequesters MeHg. The affinity of Hg is up to ≈10⁶ times higher for Se molecules than for comparable sulfur molecules, ... ...

Abstract	Ample historical evidence has demonstrated the neurotoxicity of organic Hg. However, several studies have suggested that Se effectively sequesters MeHg. The affinity of Hg is up to ≈10⁶ times higher for Se molecules than for comparable sulfur molecules, most of which are components of brain enzymes. The neurotoxicity of MeHg is associated with its binding to Se and the resultant interference with selenoenzymes (Ralston & Raymond, Global Advances in Selenium Research from Theory to Application, 2016). Therefore, having ample Se reserves is an effective way to mitigate MeHg’s toxicity. When the molar ratios of Se to Hg in fish exceed 1.0, ingestion of the fish is unlikely to deplete Se reserves. The goal of this study was to determine the Hg and Se levels, and the Se:Hg molar ratios in freshwater fish from south Louisiana and the implications of those ratios with respect to fish consumption and Hg advisories. Five waterbodies were surveyed (University lake, Calcasieu lake, Toledo Bend, the Atchafalaya River and Henderson Lake). The sampled species included black drum (Pogonias cromis), catfish sp., largemouth bass (Micropterus salmoides) and bluegill (Eupomotis macrochirus). All fish were assayed for total Hg and Se. The average Hg concentration was 0.001 µmol g⁻¹ (0.21 ppm), and all concentrations were below the 1 ppm US FDA action level (from 3.1 × 10–⁵ to 0.003 µmol g⁻¹). Se concentrations exceeded Hg concentrations in most cases. The average Se concentration was 0.003 µmol g⁻¹ (0.27 ppm), all concentrations were around or less than 1.0 ppm (from 3.7 × 10–⁴ to 0.017 µmol g⁻¹). Hence, the Se:Hg molar ratios were >1 in all fish except largemouth bass from Henderson Lake. In general, Se was detected in sufficient amounts to sequester Hg, but consumption of largemouth bass from Henderson Lake would pose no risk only if anglers followed the posted Hg advisory. For advisory purposes, perhaps, both Hg and Se levels and Se:Hg molar ratios should be considered. In general, the results indicated that risk assessment will require consideration of both the fish species and body of water, because both can influence Se and Hg concentrations and Se:Hg molar ratios.
Keywords	Food and Drug Administration ; Lepomis macrochirus ; Micropterus salmoides ; Pogonias cromis ; brain ; catfish ; enzymes ; fish consumption ; freshwater fish ; ingestion ; lakes ; mercury ; methylmercury compounds ; neurotoxicity ; risk ; risk assessment ; rivers ; selenium ; sulfur ; surface water ; Louisiana
Language	English
Dates of publication	2019-0223
Size	p. 238-245.
Publishing place	Taylor & Francis
Document type	Article
ZDB-ID	196584-0
ISSN	1532-4117 ; 0360-1226 ; 1077-1204 ; 1093-4529
ISSN (online)	1532-4117
ISSN	0360-1226 ; 1077-1204 ; 1093-4529
DOI	10.1080/10934529.2018.1546495
Database	NAL-Catalogue (AGRICOLA)

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Article: Surface sediment properties and heavy metal pollution assessment in the Shallow Sea Wetland of the Liaodong Bay, China

Wang, Jin / Edward A. Laws / Guangming Zhao / Hongming Yuan / Siyuan Ye / Xigui Ding

Marine pollution bulletin. 2017 July 15, v. 120, no. 1-2

2017

Abstract: Liaodong Bay, a semi-enclosed bay located in northeastern China, is impacted by the discharges of five rivers. We analyzed 100 surface sediment samples from the Shallow Sea Wetland of Liaodong Bay for grain size and concentrations of organic carbon (Corg) ...

Abstract	Liaodong Bay, a semi-enclosed bay located in northeastern China, is impacted by the discharges of five rivers. We analyzed 100 surface sediment samples from the Shallow Sea Wetland of Liaodong Bay for grain size and concentrations of organic carbon (Corg) and heavy metals. The ranges of the heavy metal concentrations were 2.32–17μg/g (As), 0.025–1.03μg/g (Cd), 18.9–131μg/g (Cr), 4.6–36.1μg/g (Cu), 0.012–0.29μg/g (Hg), 13.7–33.9μg/g (Pb), and 17.4–159μg/g (Zn). Pollution assessments revealed that some stations were moderately to highly polluted with As, Cd, and Hg. Severe pollution was apparent in the Xiaoling River estuary; lower concentrations of heavy metals were observed in other river mouths, where the sediments were more coarse. The distributions of the heavy metals were closely associated with Corg and grain size.
Keywords	arsenic ; cadmium ; carbon ; estuaries ; heavy metals ; mercury ; pollution ; rivers ; sediments ; wetlands ; China
Language	English
Dates of publication	2017-0715
Size	p. 347-354.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2001296-2
ISSN	1879-3363 ; 0025-326X
ISSN (online)	1879-3363
ISSN	0025-326X
DOI	10.1016/j.marpolbul.2017.05.051
Database	NAL-Catalogue (AGRICOLA)

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Article: Warming and eutrophication combine to restructure diatoms and dinoflagellates

Xiao, Wupeng / Andrew J. Irwin / Bangqin Huang / Bingzhang Chen / Edward A. Laws / Lei Wang / Xin Liu / Yang Zeng

Water research. 2018 Jan. 01, v. 128

2018

Abstract: Temperature change and eutrophication are known to affect phytoplankton communities, but relatively little is known about the effects of interactions between simultaneous changes of temperature and nutrient loading in coastal ecosystems. Here we show ... ...

Abstract	Temperature change and eutrophication are known to affect phytoplankton communities, but relatively little is known about the effects of interactions between simultaneous changes of temperature and nutrient loading in coastal ecosystems. Here we show that such interaction is key in driving diatom-dinoflagellate dynamics in the East China Sea. Diatoms and dinoflagellates responded differently to temperature, nutrient concentrations and ratios, and their interactions. Diatoms preferred lower temperature and higher nutrient concentrations, while dinoflagellates were less sensitive to temperature and nutrient concentrations, but tended to prevail at low phosphorus and high N:P ratio conditions. These different traits of diatoms and dinoflagellates resulted in the fact that both the effect of warming resulting in nutrients decline as a consequence of increasing stratification and the effect of increasing terrestrial nutrient input as a result of eutrophication might promote dinoflagellates over diatoms. We predict that conservative forecasts of environmental change by the year 2100 are likely to result in the decrease of diatoms in 60% and the increase of dinoflagellates in 70% of the surface water of the East China Sea, and project that mean diatoms should decrease by 19% while mean dinoflagellates should increase by 60% in the surface water of the coastal East China Sea. This analysis is based on a series of statistical niche models of the consequences of multiple environmental changes on diatom and dinoflagellate biomass in the East China Sea based on 2815 samples randomly collected from 23 cruises spanning 14 years (2002–2015). Our findings reveal that dinoflagellate blooms will be more frequent and intense, which will affect coastal ecosystem functioning.
Keywords	Bacillariophyceae ; biomass ; ecosystems ; eutrophication ; Miozoa ; models ; nutrient content ; nutrients ; phosphorus ; phytoplankton ; pollution load ; surface water ; temperature ; East China Sea
Language	English
Dates of publication	2018-0101
Size	p. 206-216.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	202613-2
ISSN	1879-2448 ; 0043-1354
ISSN (online)	1879-2448
ISSN	0043-1354
DOI	10.1016/j.watres.2017.10.051
Database	NAL-Catalogue (AGRICOLA)

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