Community composition in mangrove ponds with pulsed hypoxic and acidified conditions


"The potential resilience of biological communities to accelerating rates of global change has received considerable attention. We suggest that some shallow aquatic ecosystems, where temperature, dissolved oxygen (DO), and pH can exhibit extreme variation on short timescales of hours or days, provide an opportunity to develop a mechanistic understanding of species persistence and community assembly under harsh environmental conditions.  [...]"

Source: Ecosphere (ESA journal)
Authors: Keryn B. Gedan et al.
DOI: 10.1002/ecs2.2053

Read the full article here.

Chinese firm makes breakthrough in ocean technology

"A Chinese company is pioneering the nation's first deep-sea thermal-power technology to drive drifting underwater vehicles for an international ocean observation program, reports said Thursday.

Involving 30 countries and regions, the Argo program is a global array of 3,800 free-drifting automated vehicles dubbed "floats" that measure the temperature and salinity of the upper 2,000 meters of the ocean, according to the program website.

The new thermal-technology powered float, manufactured by the 710 Institute affiliated to the China Shipbuilding Industry Corporation and the School of Meteorologic Oceanography of National University of Defense Technology, offers a kind of perpetual motion to ocean observations, Science and Technology Daily reported on Thursday. [...]"

Source: Asia Pacific Daily

Read the full article here.

Metabolic versatility of a novel N2-fixing Alphaproteobacterium isolated from a marine oxygen minimum zone


"The N2-fixing (diazotrophic) community in marine ecosystems is dominated by non-cyanobacterial microorganisms. Yet, very little is known about their identity, function and ecological relevance due to a lack of cultured representatives. Here we report a novel heterotrophic diazotroph isolated from the oxygen minimum zone (OMZ) off Peru. [...]"

Source: environmental microbiology
Authors: Clara Martínez-Pérez et al.
DOI: 10.1111/1462-2920.14008

Read the full article here.

Marine N2O emissions from nitrification [...] constrained by modern observations and projected in multi-millennial global warming simula


"Nitrous oxide (N2O) is a potent greenhouse gas (GHG) and ozone destructing agent, yet, global estimates of N2O emissions are uncertain. Marine N2O stems from nitrification and denitrification processes which depend on organic matter cycling and dissolved oxygen (O2). We introduce N2O as an obligate intermediate product of denitrification and as an O2-dependent byproduct from nitrification in the Bern3D ocean model. [...]"

Source: Global Biogeochemical Cycles
Authors: G. Battaglia, F. Joos
DOI: 10.1002/2017GB005671

Read the full article here.

Evaluating the promise and pitfalls of a potential climate change–tolerant sea urchin fishery in southern California


"Marine fishery stakeholders are beginning to consider and implement adaptation strategies in the face of growing consumer demand and potential deleterious climate change impacts such as ocean warming, ocean acidification, and deoxygenation. This study investigates the potential for development of a novel climate change-tolerant sea urchin fishery in southern California based on Strongylocentrotus fragilis (pink sea urchin), a deep-sea species whose peak density was found to coincide with a current trap-based spot prawn fishery (Pandalus platyceros) in the 200–300-m depth range. [...]"

Source: ICES Journal of Marine Science
Authors: Kirk N Sato et al.
DOI: 10.1093/icesjms/fsx225

Read the full article here.

PICES 4th International Symposium: Extended deadline for abstract submission

The 4th International Symposium on The Effects of Climate Change on the Worlds Oceans has extended it's abstract submission deadline to January 12, 2018. You can find more information about abstract submission following this link


Patterns of deoxygenation: sensitivity to natural and anthropogenic drivers


"Observational estimates and numerical models both indicate a significant overall decline in marine oxygen levels over the past few decades. Spatial patterns of oxygen change, however, differ considerably between observed and modelled estimates. Particularly in the tropical thermocline that hosts open-ocean oxygen minimum zones, observations indicate a general oxygen decline, whereas most of the state-of-the-art models simulate increasing oxygen levels. Possible reasons for the apparent model-data discrepancies are examined. [...]"

Source: Philosophical Transactions of the Royal Socie
Authors: Andreas Oschlies et al.
DOI: 10.1098/rsta.2016.0325

Read the full article here.

Bacterial Community Profiling of the Arabian Sea Oxygen Minimum Zone Sediments using Cultivation Independent Approach


"The eastern Arabian Sea has a unique and permanent oxygen minimum zone (OMZ) that extends along the western continental margin of India. In order to understand the bacterial community structure and diversity of OMZ sediment of the Arabian Sea (AS), PCR-DGGE analysis were carried out for samples collected off Ratnagiri, Goa and Karwar at 50m, 200m, 500m and 1000m depths. [...]"

Source: Examines Mar Biol Oceanogr
Authors: Baby Divya, Annie Feby and Shanta Nair

Read the full article here.

Biodiversity surprises at bubbly deep-sea cold seeps along Cascadia fault

"A new study led by Oregon State University (OSU) graduate student Sarah Seabrook that uses scientific data and samples from Ocean Networks Canada (ONC) focuses on the extent, variability, and complexity of species—from microbes to tubeworms—found at deep-sea cold seep habitats along the Cascadia fault off the west coast of North America.

The study reports for the first time on the surprisingly rich and diverse microbial and animal communities at eight recently discovered cold seeps, comparing these new sites off the coasts of Washington, Oregon, and northern California with two known seeps off the coast of British Columbia at Barkley Canyon and Clayoquot Slope—both monitored by ONC's cabled offshore observatory. [...]"


Read the full article here.

The Northern Gulf of Mexico During OAE2 and the Relationship Between Water Depth and Black Shale Development


"Despite their name, Oceanic Anoxic Events (OAEs) are not periods of uniform anoxia and black shale deposition in ancient oceans. Shelf environments account for the majority of productivity and organic carbon burial in the modern ocean, and this was likely true in the Cretaceous as well. However, it is unlikely that the mechanisms for such an increase were uniform across all shelf environments. Some, like the northwest margin of Africa, were characterized by strong upwelling, but what might drive enhanced productivity on shelves not geographically suited for upwelling? [...]"

Source: Plaeoceanography
Authors: Christopher M. Lowery
DOI: 10.1002/2017PA003180

Read the full article here.

On the effect of low oxygen concentrations on bacterial degradation of sinking particles


"In marine oxygen (O2) minimum zones (OMZs), the transfer of particulate organic carbon (POC) to depth via the biological carbon pump might be enhanced as a result of slower remineralisation under lower dissolved O2 concentrations (DO). In parallel, nitrogen (N) loss to the atmosphere through microbial processes, such as denitrification and anammox, is directly linked to particulate nitrogen (PN) export.  [...]"

Source: Scientific Reports
Authors: Frédéric A. C. Le Moigne
DOI: 10.1038/s41598-017-16903-3

Read the full article here.


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