The Experts below are selected from a list of 20364 Experts worldwide ranked by ideXlab platform
Iris C Anderson - One of the best experts on this subject based on the ideXlab platform.
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benthic Algae Control sediment water column fluxes of organic and inorganic nitrogen compounds in a temperate lagoon
Limnology and Oceanography, 2003Co-Authors: Anna Christina Tyler, Karen J Mcglathery, Iris C AndersonAbstract:Coastal lagoons are a common land-margin feature worldwide and function as an important filter for nutrients entering from the watershed. The shallow nature of lagoons leads to dominance by benthic autotrophs, which can regulate benthic‐pelagic coupling. Here we demonstrate that both microAlgae and macroAlgae are important in Controlling dissolved inorganic as well as organic nitrogen (DIN and DON) fluxes between the sediments and the water column. Fluxes of nitrogen (NH , NO , DON, urea, and dissolved free and combined amino acids [DFAA, 12 43 DCAA]) and O2 were measured from October 1998 through August 1999 in sediment cores collected from Hog Island Bay, Virginia. Cores were collected from four sites representing the range of environmental conditions across this shallow lagoon: muddy, high-nutrient and sandy, low-nutrient sites that were both dominated by benthic microAlgae, and a mid-lagoon site with fine sands covered by dense macroalgal mats. Sediment‐water column DON fluxes were highly variable and comparable in magnitude to DIN fluxes; fluxes of individual compounds (urea, DFAA, DCAA) often proceeded simultaneously in different directions. Where sediment metabolism was net autotrophic because of microalgal activity, TDN (total dissolved nitrogen) fluxes, mostly comprised of DIN, urea, and DFAA, were directed into the sediments. Heterotrophic sediments, including those underlying macroalgal mats, were a net source of TDN, mostly as DIN. MacroAlgae intercepted sediment‐water column fluxes of DIN, urea, and DFAA, which accounted for 27‐75% of calculated N demand. DON uptake was important in satisfying macroalgal N demand seasonally and where DIN concentrations were low. Up to 22% of total N uptake was released to the water column as DCAA. Overall, macroAlgae assimilated, transformed, and rereleased to the water column both organic and inorganic N on short (minutes‐hours) and long (months) time scales. MicroAlgae and macroAlgae clearly regulate benthic‐pelagic coupling and thereby influence transformations and retention of N moving across the land‐sea interface.
Xia Yue - One of the best experts on this subject based on the ideXlab platform.
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Algae growth distribution and key prevention and Control positions for the middle route of the south to north water diversion project
Water, 2019Co-Authors: Jie Zhu, Xiaohui Lei, Jin Quan, Xia YueAbstract:The Middle Route of the South-to-North Water Diversion Project (MRP) is an important water supply for 20 large cities and 100 counties in Northern China. However, since 2016, the growth of large filamentous Algae clusters has threatened the safety of the main canal water supply and water quality. In this study, a field investigation, monitoring, and hydrodynamic simulation were performed to analyze the hydrodynamic habitat conditions in areas with vigorous Algae growth and establish a relationship between the hydrodynamic habitat conditions of the main canal and the growth, distribution, and correlation of macrobenthic Algae in the main canal. The results showed that: (1) Algae zones in the main canal are more likely to appear along curves, and the largest algal zone was at the front of the large curved section; (2) the length of the Algae growth zone is related to the flow rate; and (3) a lower flow velocity in the main canal facilitates faster growth of an Algae zone. This study provides specific and effective suggestions for the key prevention and Control positions, which has important guidance on improving the efficiency of Algae Control in the main canal.
Wenxia Wang - One of the best experts on this subject based on the ideXlab platform.
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Contrasting response of a plankton community to two filter-feeding fish and their feces: An in situ enclosure experiment
Aquaculture, 2016Co-Authors: Wang Yinping, Zhigang Mao, Qingfei Zeng, Wenxia WangAbstract:Abstract The responses of plankton communities and nutrient loads to different biomass levels of silver carp and tilapia (0, 25, 70, 130 g/m 3 ) were evaluated in situ , using enclosures in Lake Taihu, and the effects of fish feces on algal biomass were assessed using in situ dialysis culture. Both silver carp and tilapia significantly suppressed zooplankton biomass, after which zooplankton grazing was too low to suppress algal populations. Both fish also played an important role in accelerating nutrient circulation, and their feces directly contributed to algal growth. In fact, after passing through the digestive tract of silver carp, the cyanobacteria Microcystis remained viable, and their photosynthetic activity was even stimulated; however, no viable Algae were detected in the tilapia feces. Overall, algal biomass increased with increasing biomass levels of the tilapia, whereas the medium biomass level of silver carp (70 g/m 3 ) was most effective in Controlling cyanobacteria. Our results indicate that stocking with silver carp, rather than with tilapia, is an appropriate strategy for reducing summer cyanobacteria blooms in eutrophic lakes that lack large crustaceous zooplankton, such as Lake Taihu. In addition, stocking with 70 g/m 3 of silver carp was most effective for suppressing cyanobacteria blooms and improving water quality, which suggests that this moderate biomass level can be used to achieve a beneficial balance between the positive effects of filter feeding and negative effects of feces-derived nutrients on the growth of Algae. Statement of relevance Good for Algae Control and aquaculture yields increase.
Jian Zhou - One of the best experts on this subject based on the ideXlab platform.
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influence of eugenol on algal growth cell physiology of cyanobacteria microcystis aeruginosa and its interaction with signaling molecules
Chemosphere, 2020Co-Authors: Pengcheng Zhao, Shihu Liu, Wei Huang, Jiong Zhou, Jian ZhouAbstract:Abstract Essential oils (EOs) are naturally occurring substances that have shown great prospect in the field of antimicrobial, antioxidant and pest Control by nontoxic mechanisms. In this regard, EOs are considered the promising and eco-friendly approach for Controlling harmful Algae. In this study, the anti-cyanobacterial activity of EOs eugenol against Microcystis aeruginosa are evaluated from the perspective of photosynthetic efficiency, the behavior of extracellular organic matter (EOM), endogenous plant hormone synthesis, and nitric oxide signaling pathway. Results showed that the photosynthetic activity of M. aeruginosa decreased significantly after eugenol treatments. Eugenol treatment resulted in cells rupture and the release of EOM. Levels of endogenous plant hormones salicylic acid (SA) and jasmonic acid (JA) were enhanced separately by 2.32 and 2.01 times after 4 d of exposure to eugenol. And the inhibition of SA and JA biosynthesis further promotes the inhibitory effects of eugenol on Algae. Additionally, the signaling molecule nitric oxide (NO) increased significantly by 3.78-fold. Furthermore, the influence of NO on microAlgae exposed to eugenol was also determined, suggesting that the inhibitory effect of eugenol stress might be associated with NO generation in M. aeruginosa. These findings will be helpful for the understanding of the fate and potential of eugenol in harmful Algae Control.
Akihiko Kondo - One of the best experts on this subject based on the ideXlab platform.
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Energy Transfer in Cyanobacteria and Red Algae: Confirmation of Spillover in Intact Megacomplexes of Phycobilisome and Both Photosystems.
The journal of physical chemistry letters, 2016Co-Authors: Shimpei Aikawa, Akihiko KondoAbstract:Cyanobacteria and red Algae Control the energy distributions of two photosystems (PSI and PSII) by changing the energy transfer among phycobilisome (PBS), PSI, and PSII. However, whether PSII → PSI energy transfer (spillover) occurs in the intact megacomplexes composed of PBS, PSI, and PSII (PBS–PSII–PSI megacomplexes) in vivo remains controversial. In this study, we measured the delayed fluorescence spectra of PBS-selective excitation in cyanobacterial and red algal cells. In the absence of spillover, 7% of the PBS (at most) would combine with PSII, inconsistent with the PBSs’ function as the antenna pigment–protein complexes of PSII. Therefore, we conclude that spillover occurs in vivo in PBS–PSII–PSI megacomplexes of both cyanobacteria and red Algae.