This study demonstrated the potential effects of internal waves (IWs) on heterotrophic bacterial activities for the first time. Nine anchored studies were conducted from 2009-2012 in the South China Sea areas with different physical conditions, i.e. areas subjected to elevation IWs, to depression IWs, and to weak/no IWs. The latter two areas were treated as the Control sites. Field survey results indicated that within the euphotic zone, the minima of the depth-averaged bacterial production (IBP; ∼1.0 mgC m d ) and growth rate (IBμ; ∼0.1 d ) at all sites were similar. Except for one case, the maxima of IBP (6-12 mgC m d ) and IBμ (0.55-1.13 d ) of the elevation IWs areas were ∼fivefolds higher than those of the Control sites (IBP 1.7-2.1 mgC m d ; IBμ 0.13-0.24 d ). Replicate surveys conducted at the north-western area of the Dongsha atoll during spring-to-neap (NW1 survey) and neap-to-spring (NW2 survey) tide periods showed a great contrast to each other. Low variation and averages of IBμ in NW1 survey were similar to those of the Control sites, while those in NW2 were similar to the other elevation IWs sites with larger variation and higher averages of IBμ. This finding suggests that bacterial activities may be a function of the lunar fortnightly (14-day) cycle. Enrichment experiments suggested more directly that the limiting inorganic nutrients introduced by the elevation waves (EIWs) may contribute a higher IBμ within the euphotic zone.

Download full-text PDF

Source
http://dx.doi.org/10.1111/1462-2920.13273DOI Listing

Publication Analysis

Top Keywords

elevation iws
12
control sites
12
heterotrophic bacterial
8
south china
8
china sea
8
bacterial activities
8
iws areas
8
euphotic zone
8
mgc ibμ
8
nw1 survey
8

Similar Publications

Oxygenator assisted dynamic microphysiological culture elucidates the impact of hypoxia on valvular interstitial cell calcification.

J Biol Eng

August 2024

Department of Cardiac Surgery, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Heart Centre Dresden, Dresden, Germany.

Introduction: Microphysiological systems (MPS) offer simulation of (patho)physiological parameters. Investigation includes items which lead to fibrosis and calcification in development and progress of calcific aortic valve disease, based e.g.

View Article and Find Full Text PDF

Background: Obesity is highly stigmatized, with negative obesity-related stereotypes widespread across society. Internalized weight stigma (IWS) is linked to negative outcomes including poor mental health and disordered eating. Previous evidence examining population groups at higher risk of experiencing IWS comes from small, nonrepresentative samples.

View Article and Find Full Text PDF

Objectives: Systemic inflammatory response syndrome (SIRS) is a frequent complication of cardiopulmonary bypass (CPB). SIRS is associated with significant morbidity and mortality, but its pathogenesis remains incompletely understood, and as a result, biomarkers are lacking and treatment remains expectant and supportive. This study aimed to understand the pathophysiological mechanisms driving SIRS induced by CPB and identify novel therapeutic targets that might reduce systemic inflammation and improve patient outcomes.

View Article and Find Full Text PDF

Introduction: Internalized weight stigma (IWS) is linked to binge eating disorder (BED) symptoms and reduced self-efficacy, yet it unknown how changes in these factors may interrelate. The current study examined cross-sectional and longitudinal associations of BED with IWS and eating self-efficacy among treatment-seeking adults with high body weight. Disinhibited eating was explored as a mediator.

View Article and Find Full Text PDF

Internal water storage (IWS), a below-grade saturated layer, is a bioretention design component created by adjusting the underdrain outlet elevation. Anaerobic conditions and the presence of a carbon source in IWS facilitates denitrification. Yet it remains unclear how underdrain height within the IWS impacts nitrate (NO) removal.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!