ABSTRACT Despite the increasing knowledge of Synechococcus spp. and their co-occurring cyanophages in oceanic coastal water, little is known about abundance, distribution, interactions Chesapeake Bay estuarine ecosystem. A 5-year interannual survey shows that phages are persistent abundant members microbial communities. blooms (10 6 cells ml −1 ) were often observed summer throughout Bay, contributing 20 to 40% total phytoplankton chlorophyll a . The distribution phycoerythrin-containing...

We monitored bacterioplankton communities from Chesapeake Bay over 2 years (2002-2004) by use of denaturing gradient gel electrophoresis (DGGE) PCR-amplified 16S rRNA gene. exhibited a repeatable annual pattern and strong seasonal shifts. In winter, the bacterial were dominated Alphaproteobacteria Actinobacteria, whereas in summer, predominant bacteria members Alphaproteobacteria, Gammaproteobacteria, Cyanobacteria, Planctomycetes, Bacteroidetes. Phylotypes Actinobacteria present warm...

In the Chesapeake Bay, picocyanobacteria were usually 100-fold less abundant in winter than summer. However, little is known about how picocyanobacterial populations shift between and summer bay. This due mainly to undetectable bacterial 16S rRNA clone libraries. this study, bay detected using picocyanobacterium-specific primers compared based on analysis of internal transcribed spacer sequences. Temperature was found be dominant environmental factor controlling Bay. summer, marine cluster B...

Coastal and ocean acidification can alter biogeochemistry, with ecological consequences that may result in economic cultural losses. Yet few time series high resolution spatial temporal measurements exist to track the existence movement of water low pH and/or carbonate saturation. Past monitoring efforts have either (mooring) or cost (research cruises). We developed first integrated glider platform sensor system for sampling throughout column coastal ocean. A deep ISFET (Ion Sensitive Field...

Coastal hypoxia has become common especially in large river dominated coastal ecosystems. To better quantify the severity of and contribution drivers, we applied principal component analysis (PCA) on observable properties from eight summer events East China Sea defined first as index (HI). Multiple linear regression showed that HI significantly correlated with three direct drivers including water column stratification, subsurface residence time, respiration rates, which accounted for 5.7,...

Decomposers play an important role in the biogeochemical cycle. Protaetia brevitarsis larvae (PBLs) can transform wastes into frass rich humic acid (HA) and microorganisms, which may increase disease resistance of plants promote plant growth. Beyond HA, microorganisms also contribute to biostimulant activity. To address this hypothesis, we investigated potential microbial community PBL samples elucidated their functions growth promotion. High-throughput sequencing analysis four PBL-relevant...

ABSTRACT E3 ubiquitin ligases are major components of the ubiquitination cascade and contribute to stomatal responses pathogen drought stress in plants. The F‐box SKP1‐Interacting Partners (AtSKIPs) proteins members SCF ligase complexes; however, whether they have any involvement movement remains unclear. Here, based on tissue expression profiling, we found that AtSKIP5 protein was highly expressed guard cells. Mutation rendered plants more susceptible Pseudomonas syringae pv. tomato (Pst)...

Abstract A monthlong, high‐resolution buoy time series from the surface ocean of Changjiang River plume in early autumn 2013 (30‐min sampling frequency) shows great variability partial pressure carbon dioxide ( p CO 2 ) and other physical biogeochemical parameters. Early deployment, decreased by ~117 μatm a single day (11–12 September, an initial value ~527 μatm); similar decline 62 occurred five days later (to ~378 μatm). Both drawdown events were associated with strong vertical...

Abstract High‐accuracy spectrophotometric pH measurements were taken during a summer cruise to study the dynamics and its controlling mechanisms in northern Gulf of Mexico hypoxia season. Using recently available dissociation constants purified m‐cresol purple (Douglas & Byrne, 2017, https://doi.org/10.1016/j.marchem.2017.10.001 ; Müller Rehder, 2018, https://doi.org/10.3389/fmars.2018.00177 ), spectrophotometrically measured showed excellent agreement with calculated from dissolved...

Abstract The Changjiang Estuary is a large‐river estuary ecosystem in the East China Sea, and its plume, Diluted Water (CDW), transports large mass of nutrients ( + , ) to shelf sea, leading substantial eutrophication; CDW also supports high primary production. However, relationships between nutrient delivery phytoplankton responses have been difficult establish, as many events algal blooms are episodic, may expand or become detached with changing winds. To study relationship events,...

Multiple cropping provides China with a very important system of intensive cultivation, and can effectively enhance the efficiency farmland use while improving regional food production security. A multiple index (MCI), which represents intensity reflects effects climate change on agricultural systems, often serves as useful parameter. Therefore, monitoring dynamic changes in MCI over large area using remote sensing data is essential. For this purpose, nearly 30 years MCIs related to dry land...

Abstract A high‐resolution mooring record from the Changjiang River plume (45‐m depth) is used to investigate how air‐sea CO 2 flux responds typhoon in productive plume. With strong wind, surface partial pressure of carbon dioxide ( p ) increased sharply 369 606 μatm due entrainment high‐CO subsurface water. Though it was followed by decrease 250 and Chl a increase days after typhoon, caused net efflux overall. The maximum (+111.6 mmol·m −2 ·day −1 much greater than that under non‐typhoon...

Abstract Fluxes of particulate organic carbon (POC) in the East China Sea (ECS) have been reported to decrease from inner continental shelf towards outer shelf. Recent research has shown that POC fluxes ECS may be overestimated due active sediment resuspension. To better characterize effect resuspension on particle ECS, rare earth elements (REEs) and (OC) were used separate two-member mixing models evaluate trap-collected fluxes. The ratio resuspended particles sediments total ranged 82–94%...

Abstract Coastal waters often experience enhanced ocean acidification due to the combined effects of climate change and regional biological anthropogenic activities. Through reconstructing summertime bottom pH in northern Gulf Mexico from 1986 2019, we demonstrated that eutrophication‐fueled respiration dominated changes on intra‐seasonal interannual timescales, resulting recurring coinciding with hypoxia. However, multi‐decadal trend was principally driven by rising atmospheric CO 2...

Despite significant implications of viral activity in sediment ecosystems, there are limited data describing how assemblages respond to broader ecosystem changes. To document this, the spatial and temporal dynamics bacterial abundance (BA) changes morphological distribution viruses were examined within three salinity regions over 2 years. Viral abundances (VA) ranged from 0.2 17 × 10(10) mL(-1) while direct counts 3.8 37 10(8) cells sediment. Peaks valleys extracted bacteria surface...

Coastal and ocean acidification can alter biogeochemistry, with ecological consequences that may result in economic cultural losses. Yet few time series high-resolution measurements exist to track the existence movement of water low pH and/or carbonate saturation. Past monitoring efforts have either spatial resolution (mooring) or high cost temporal (research cruises). Therefore, there is a critical need deploy new, cost-effective technologies routinely provide column data on regional scales...

In this study, a comparison was made between the Changjiang Estuary and Hanghzou Bay, in terms of sources diagenesis sedimentary organic matter (OM). To achieve purpose, surface sediments from estuary bay were analyzed for lignin-derived phenols, stable carbon isotope TOC/TN (total carbon/total nitrogen) molar ratio. The signal land-derived OM decreased, vanillic acid to vanillin ratio, (Ad/Al)v, increased with increasing distance Hangzhou Bay. These results corresponded contribution...