News

Flow-driven micro-scale pH variability affects the physiology of corals and coralline algae under ocean acidification

Abstract.

"Natural variability in pH in the diffusive boundary layer (DBL), the discrete layer of seawater between bulk seawater and the outer surface of organisms, could be an important factor determining the response of corals and coralline algae to ocean acidification (OA). Here, two corals with different morphologies and one coralline alga were maintained under two different regimes of flow velocities, pH, and light intensities in a 12 flumes experimental system for a period of 27 weeks. [...]"

Source: Scientific Reports
Authors: S. Comeau et al.
DOI: 10.1038/s41598-019-49044-w

Read the full article here.


Ocean Sciences Meeting

ABOUT THE OCEAN SCIENCES MEETING 2020

The Ocean Sciences Meeting (OSM) is the flagship conference for the ocean sciences and the larger ocean-connected community.  As we approach the UN Decade of Ocean Science for Sustainable Development, beginning in 2021, it is increasingly important to gather as a scientific community to raise awareness of the truly global dimension of the ocean, address environmental challenges, and set forth on a path towards a resilient planet. 

The Ocean Sciences Meeting 2020 is co-sponsored by AGU, the Association for the Sciences of Limnology and Oceanography (ASLO), and The Oceanography Society (TOS).  Through the combined power of these three organizations, along with the broader conservation-focused community, this meeting provides attendees the opportunity to bridge disciplines, connect communities, and make lasting partnerships. 

Visit the event homepage for more information and submit abstracts here.


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Combined effects of ocean acidification and temperature on larval and juvenile growth, development and swimming performance of European sea bass

Abstract.

"Ocean acidification and ocean warming (OAW) are simultaneously occurring and could pose ecological challenges to marine life, particularly early life stages of fish that, although they are internal calcifiers, may have poorly developed acid-base regulation. This study assessed the effect of projected OAW on key fitness traits (growth, development and swimming ability) in European sea bass (Dicentrarchus labrax) larvae and juveniles. [...]"

Source: PLoS One
Authors: Louise Cominassi etal.
DOI: 10.1371/journal.pone.0221283

Read the full article here.


Dinitrogen fixation across physico‐chemical gradients of the Eastern Tropical North Pacific oxygen deficient zone

Abstract.

"The Eastern Tropical North Pacific (ETNP) Ocean hosts one of the world's largest oceanic oxygen deficient zones (ODZs). Hotspots for reactive nitrogen (Nr) removal processes, ODZs generate conditions proposed to promote Nr inputs via dinitrogen (N2) fixation. In this study, we quantified N2 fixation rates by 15N‐tracer bioassay across oxygen, nutrient and light gradients within and adjacent to the ODZ. [...]"

Source: Global Biogeochemical Cycles
Authors: C.R. Selden et al.
DOI: 10.1029/2019GB006242

Read the full article here.


Chinese Scientists Develop Online Monitoring Instruments for Ocean Environmental Safety

"Chinese scientists have developed an online system to monitor marine-biochemical elements, according to Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, who led the project. The research team developed the online monitoring instruments by integrating three measurement modules namely, the chlorophyll module, productivity module and dissolved oxygen module, which are all developed by the team itself. [...]"

Source: Chinese Academy of Sciences

Read the full article here.


Ocean phosphorus inventory: large uncertainties in future projections on millennial timescales and their consequences for ocean deoxygenation

Abstract.

"Previous studies have suggested that enhanced weathering and benthic phosphorus (P) fluxes, triggered by climate warming, can increase the oceanic P inventory on millennial timescales, promoting ocean productivity and deoxygenation. In this study, we assessed the major uncertainties in projected P inventories and their imprint on ocean deoxygenation using an Earth system model of intermediate complexity for the same business-as-usual carbon dioxide (CO2) emission scenario until the year 2300 and subsequent linear decline to zero emissions until the year 3000. [...]"

Source: Earth System Dynamics
Authors: Tronje P. Kemena et al.
DOI: 10.5194/esd-10-539-2019

Read the full article here.


Oxygen supersaturation protects coastal marine fauna from ocean warming

Abstract.

"Ocean warming affects the life history and fitness of marine organisms by, among others, increasing animal metabolism and reducing oxygen availability. In coastal habitats, animals live in close association with photosynthetic organisms whose oxygen supply supports metabolic demands and may compensate for acute warming. [...]"

Source: Science Advances 
Authors: Folco Giomi et al.
DOI:  10.1126/sciadv.aax1814

Read the full article here.


A numerical model study of the main factors contributing to hypoxia and its sub-seasonal to interannual variability off the Changjiang Estuary

Abstract.

"A three-dimensional physical-biological model of marginal seas of China was used to analyze variations in hypoxic conditions and identify the main processes controlling their generation off the Changjiang Estuary. The model was validated against available observations and reproduces the observed temporal and spatial variability of hypoxia. [...]"

Source: Biogeosciences (preprint)
Authors: Haiyan Zhang et al.
DOI: 10.5194/bg-2019-341

Read the full article here.


High-throughput screening of sediment bacterial communities from Oxygen Minimum Zones of the northern Indian Ocean

Abstract.

"The Northern Indian Ocean host two recognized Oxygen Minimum Zones (OMZ): one in the Arabian Sea and the other in the Bay of Bengal region. The next-generation sequencing technique was used to understand the total bacterial diversity from the surface sediment of off Goa within the OMZ of Arabian Sea, and from off Paradip within the OMZ of Bay of Bengal. [...]"

Source: Biogeosciences (preprint)
Authors: Jovitha Lincy and Cathrine Manohar
DOI: 10.5194/bg-2019-330

Read the full article here.


Quantifying the contributions of riverine vs. oceanic nitrogen to hypoxia in the East China Sea

Abstract.

"In the East China Sea, hypoxia (oxygen ≤ 62.5 mmol m−3) is frequently observed off the Changjiang (or Yangtze) River estuary covering up to about 15,000 km2. The Changjiang River is a major contributor to hypoxia formation because it discharges large amounts of freshwater and nutrients into the region. However, modelling and observational studies have suggested that intrusions of nutrient-rich oceanic water from the Kuroshio also contribute to hypoxia formation. [...]"

Source: Biogeosciences (preprint)
Authors: Fabian Große et al.
DOI: 10.5194/bg-2019-342 

Read the full article here.


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