scholarly journals Missing links in the study of solute and particle exchange between the sea floor and water column

2020 ◽  
Vol 77 (5) ◽  
pp. 1602-1616 ◽  
Author(s):  
Saskia Rühl ◽  
Charlie Thompson ◽  
Ana M Queirós ◽  
Stephen Widdicombe
Keyword(s):  
Water Column ◽  
Current Knowledge ◽  
Anthropogenic Impacts ◽  
Future Research ◽  
Sea Floor ◽  
Marine Habitats ◽  
Exchange Processes ◽  
Ecosystem Level ◽  
Particle Exchange

Abstract Exchanges of solutes and solids between the sea floor and water column are a vital component of ecosystem functioning in marine habitats around the globe. This review explores particle and solute exchange processes, the different mechanisms through which they interact at the ecosystem level, as well as their interdependencies. Solute and particle exchange processes are highly dependent on the characteristics of the environment within which they takes place. Exchange is driven directly by a number of factors, such as currents, granulometry, nutrient, and matter inputs, as well as living organisms. In turn, the occurrence of exchanges can influence adjacent environments and organisms. Major gaps in the present knowledge include the temporal and spatial variation in many of the processes driving benthic/pelagic exchange processes and the variability in the relative importance of individual processes caused by this variation. Furthermore, the accurate assessment of some anthropogenic impacts is deemed questionable due to a lack of baseline data and long-term effects of anthropogenic actions are often unknown. It is suggested that future research should be transdisciplinary and at ecosystem level wherever possible and that baseline surveys should be implemented and long-term observatories established to fill the current knowledge gaps.

scholarly journals Gestation-Based Viability–Difficult Decisions with Far-Reaching Consequences

Children ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 593
Author(s):  
Sumesh Thomas ◽  
Elizabeth Asztalos
Keyword(s):  
Decision Making ◽  
Preterm Birth ◽  
Current Knowledge ◽  
First Trimester ◽  
Perinatal Period ◽  
Outcome Data ◽  
Future Research ◽  
Extremely Preterm ◽  
Fetal Maturity

Most clinicians rely on outcome data based on completed weeks of gestational of fetal maturity for antenatal and postnatal counseling, especially for preterm infants born at the margins of viability. Contemporary estimation of gestational maturity, based on ultrasounds, relies on the use of first-trimester scans, which offer an accuracy of ±3–7 days, and depend on the timing of the scans and the measurements used in the calculations. Most published literature on the outcomes of babies born prematurely have reported on short- and long-term outcomes based on completed gestational weeks of fetal maturity at birth. These outcome data change significantly from one week to the next, especially around the margin of gestational viability. With a change in approach solely from decisions based on survival, to disability-free survival and long-term functional outcomes, the complexity of the parental and care provider’s decision-making in the perinatal and postnatal period for babies born at less than 25 weeks gestation remains challenging. While sustaining life following birth at the margins of viability remains our priority—identifying and mitigating risks associated with extremely preterm birth begins in the perinatal period. The challenge of supporting the normal maturation of these babies postnatally has far-reaching consequences and depends on our ability to sustain life while optimizing growth, nutrition, and the repair of organs compromised by the consequences of preterm birth. This article aims to explore the ethical and medical complexities of contemporary decision-making in the perinatal and postnatal periods. We identify gaps in our current knowledge of this topic and suggest areas for future research, while offering a perspective for future collaborative decision-making and care for babies born at the margins of viability.

scholarly journals Insights into the evolution of social systems and species from baboon studies

eLife ◽  
2019 ◽  
Vol 8 ◽  
Author(s):  
Julia Fischer ◽  
James P Higham ◽  
Susan C Alberts ◽  
Louise Barrett ◽  
Jacinta C Beehner ◽  
...  
Keyword(s):  
Current Knowledge ◽  
Social Systems ◽  
Population Expansion ◽  
Sub Saharan Africa ◽  
Future Research ◽  
Closely Related Species ◽  
Ecological Flexibility ◽  
History Of ◽  
Sub Saharan

Baboons, members of the genus Papio, comprise six closely related species distributed throughout sub-Saharan Africa and southwest Arabia. The species exhibit more ecological flexibility and a wider range of social systems than many other primates. This article summarizes our current knowledge of the natural history of baboons and highlights directions for future research. We suggest that baboons can serve as a valuable model for complex evolutionary processes, such as speciation and hybridization. The evolution of baboons has been heavily shaped by climatic changes and population expansion and fragmentation in the African savanna environment, similar to the processes that acted during human evolution. With accumulating long-term data, and new data from previously understudied species, baboons are ideally suited for investigating the links between sociality, health, longevity and reproductive success. To achieve these aims, we propose a closer integration of studies at the proximate level, including functional genomics, with behavioral and ecological studies.

scholarly journals The oceanic environment beneath the northwest Ronne Ice Shelf, Antarctica

1994 ◽  
Vol 20 ◽  
pp. 386-390 ◽  
Author(s):  
Allan Robinson ◽  
Keith Makinson ◽  
Keith Nicholls
Keyword(s):  
Water Column ◽  
Ice Crystals ◽  
Temperature Record ◽  
Shelf Water ◽  
Ice Shelf ◽  
Sea Floor ◽  
Oceanographic Data ◽  
A Site ◽  
Temperature Depth

Oceanographic data have been obtained from beneath the Ronne Ice Shelf at a site on the southeastern side of a sea-floor trough, the Ronne Depression. The data consist of 5 d of conductivity temperature depth (CTD) profiling and a long-term temperature record from a thermistor cable. The water column was found to be composed of two layers: a cold buoyant layer of lce Shelf Water (ISW) overlying a layer of unmodified Western Shelf Water (WSW).A change in the water column was observed on the last day of profiling, the WSW layer thinning, a cold intrusion appearing directly above the WSW and the ISW becoming colder. In addition, on three profiles the ISW cooled further and increased in salinity, becoming apparently statically unstable. The temperature record from the thermistor cable confirms that the ISW layer occasionally becomes colder. with greater variation in temperature than seen on the CTD profiles. These low temperatures and high salinities arc interpreted as indicating that water containing ice crystals in suspension has been advected beneath the site.

scholarly journals The Impact of Non-Saccharomyces Yeast on Traditional Method Sparkling Wine

Fermentation ◽  
2018 ◽  
Vol 4 (3) ◽  
pp. 73 ◽  
Author(s):  
Nedret Ivit ◽  
Belinda Kemp
Keyword(s):  
Current Knowledge ◽  
Future Research ◽  
Sparkling Wine ◽  
Wine Production ◽  
Nutrient Supplementation ◽  
Saccharomyces Yeast ◽  
Sensory Profiles ◽  
The Impact ◽  
Saccharomyces Yeasts

The interest in non-Saccharomyces yeast for use in sparkling wine production has increased in recent years. Studies have reported differences in amino acids and ammonia, volatile aroma compounds (VOCs), glycerol, organic acids, proteins and polysaccharides. The aim of this review is to report on our current knowledge concerning the influence of non-Saccharomyces yeast on sparkling wine chemical composition and sensory profiles. Further information regarding the nutritional requirements of each of these yeasts and nutrient supplementation products specifically for non-Saccharomyces yeasts are likely to be produced in the future. Further studies that focus on the long-term aging ability of sparkling wines made from non-Saccharomyces yeast and mixed inoculations including their foam ability and persistence, organic acid levels and mouthfeel properties are recommended as future research topics.

scholarly journals Diseases of the Aorta and Kidney Disease: Conclusions from a Kidney Disease: Improving Global Outcomes (KDIGO) Controversies Conference

2021 ◽  
Author(s):  
Pantelis Sarafidis ◽  
Sven Martens ◽  
Athanasios Saratzis ◽  
Daniella Kadian-Dodov ◽  
Patrick T Murray ◽  
...  
Keyword(s):  
Kidney Disease ◽  
Current Knowledge ◽  
Aortic Surgery ◽  
Group Discussion ◽  
Kidney Injury ◽  
Future Research ◽  
Abdominal Aortic ◽  
High Prevalence ◽  
Morbid Conditions

Abstract Chronic kidney disease (CKD) is an independent risk factor for the development of abdominal aortic aneurysm (AAA), as well as for cardiovascular and renal events and all-cause mortality following surgery for AAA or thoracic aortic dissection. In addition, the incidence of acute kidney injury (AKI) after any aortic surgery is particularly high, and this AKI per se is independently associated with future cardiovascular events and mortality. On the other hand, both development of AKI after surgery and the long-term evolution of kidney function differ significantly depending on the type of AAA intervention (open surgery versus the various subtypes of endovascular repair). Current knowledge regarding AAA in the general population may not be always applicable to CKD patients, as they have a high prevalence of co-morbid conditions and elevated risk for periprocedural complications. This summary of a Kidney Disease: Improving Global Outcomes (KDIGO) Controversies Conference group discussion reviews the epidemiology, pathophysiology, diagnosis, and treatment of Diseases of the Aorta in CKD and identifies knowledge gaps, areas of controversy, and priorities for future research.

scholarly journals Challenges of Electronic Reverse Auctions in Construction Industry—A Review

Economies ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 13
Author(s):  
Tomáš Hanák ◽  
Ivan Marović ◽  
Nikša Jajac
Keyword(s):  
Construction Industry ◽  
Web Of Science ◽  
Current Knowledge ◽  
Future Research ◽  
Reverse Auctions ◽  
Long Term Effects ◽  
Ethical Considerations ◽  
Bidding Behavior ◽  
Project Outcomes

The innovation of construction procurement by means of electronic reverse auctions is a controversial subject of discussion among both researchers and practitioners. This paper consolidates and critically discusses current knowledge concerning the adoption and use of electronic reverse auctions in the light of specific features of the construction industry. A systematic literature review has been employed to select papers indexed in Scopus and Web of Science databases. The findings of the study indicate that studies are addressing especially five main areas, i.e., suitability of electronic reverse auction (eRA) for construction tenders, related drivers and barriers, ethical considerations, savings potential and bidding behavior, and bid distribution. Accordingly, the authors are suggesting three directions in which future research should focus on mutual interaction of electronic reverse auctions and long-term effects on construction project outcomes.

scholarly journals The oceanic environment beneath the northwest Ronne Ice Shelf, Antarctica

1994 ◽  
Vol 20 ◽  
pp. 386-390 ◽  
Author(s):  
Allan Robinson ◽  
Keith Makinson ◽  
Keith Nicholls
Keyword(s):  
Water Column ◽  
Ice Crystals ◽  
Temperature Record ◽  
Shelf Water ◽  
Ice Shelf ◽  
Sea Floor ◽  
Oceanographic Data ◽  
A Site ◽  
Temperature Depth

Oceanographic data have been obtained from beneath the Ronne Ice Shelf at a site on the southeastern side of a sea-floor trough, the Ronne Depression. The data consist of 5 d of conductivity temperature depth (CTD) profiling and a long-term temperature record from a thermistor cable. The water column was found to be composed of two layers: a cold buoyant layer of lce Shelf Water (ISW) overlying a layer of unmodified Western Shelf Water (WSW). A change in the water column was observed on the last day of profiling, the WSW layer thinning, a cold intrusion appearing directly above the WSW and the ISW becoming colder. In addition, on three profiles the ISW cooled further and increased in salinity, becoming apparently statically unstable. The temperature record from the thermistor cable confirms that the ISW layer occasionally becomes colder. with greater variation in temperature than seen on the CTD profiles. These low temperatures and high salinities arc interpreted as indicating that water containing ice crystals in suspension has been advected beneath the site.

scholarly journals Benthic estuarine communities in Brazil: moving forward to long term studies to assess climate change impacts

2016 ◽  
Vol 64 (spe2) ◽  
pp. 81-96 ◽  
Author(s):  
Angelo Fraga Bernardino ◽  
Paulo Roberto Pagliosa ◽  
Ronaldo Adriano Christofoletti ◽  
Francisco Barros ◽  
Sergio A. Netto ◽  
...  
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
Current Knowledge ◽  
Global Scale ◽  
Current Data ◽  
Future Research ◽  
Mangrove Forests ◽  
Ecological Processes ◽  
Estuarine Ecosystems

Abstract Estuaries are unique coastal ecosystems that sustain and provide essential ecological services for mankind. Estuarine ecosystems include a variety of habitats with their own sediment-fauna dynamics, all of them globally undergoing alteration or threatened by human activities. Mangrove forests, saltmarshes, tidal flats and other confined estuarine systems are under increasing stress due to human activities leading to habitat and species loss. Combined changes in estuarine hydromorphology and in climate pose severe threats to estuarine ecosystems on a global scale. The ReBentos network is the first integrated attempt in Brazil to monitor estuarine changes in the long term to detect and assess the effects of global warming. This paper is an initial effort of ReBentos to review current knowledge on benthic estuarine ecology in Brazil. We herein present and synthesize all published work on Brazilian estuaries that has focused on the description of benthic communities and related ecological processes. We then use current data on Brazilian estuaries and present recommendations for future studies to address climate change effects, suggesting trends for possible future research and stressing the need for long-term datasets and international partnerships.

Long-term behavior of R7T7-type nuclear glass: Current state of knowledge and outlook

2004 ◽  
Vol 824 ◽  
Author(s):  
S. Gin ◽  
N. Godon ◽  
I. Ribet ◽  
P. Jollivet ◽  
Y. Minet ◽  
...  
Keyword(s):  
Current Knowledge ◽  
Influential Factors ◽  
Future Research ◽  
Operational Model ◽  
Geological Repository ◽  
Glass Current ◽  
Interim Storage ◽  
Parameter Values ◽  
Long Term Behavior

AbstractThis article reviews current knowledge of the long-term behavior of R7T7-type glass during the thermal phase and in geological repository conditions (aqueous alteration). In interim storage R7T7 glass can be considered to conserve its integrity over time. In geological repository conditions, the mechanisms of glass alteration by water have been identified and parameter values have been assigned to the reaction kinetics for wide variations of the influential factors (temperature, pH, flow rate, S/V ratio, etc.). CEA has developed an operational model to obtain robust and reasonably conservative predictions of the glass quantities altered after disposal. Examples of applications of the operational model are discussed, future research topics are also proposed to consolidate this approach.

scholarly journals Consequences of changing water clarity on the fish and fisheries of the Laurentian Great Lakes

2021 ◽  
pp. 1-19
Author(s):  
David B. Bunnell ◽  
Stuart A. Ludsin ◽  
Roger L. Knight ◽  
Lars G. Rudstam ◽  
Craig E. Williamson ◽  
...  
Keyword(s):  
Great Lakes ◽  
Current Knowledge ◽  
Water Clarity ◽  
Laurentian Great Lakes ◽  
Future Research ◽  
Sampling Efficiency ◽  
Foraging Success ◽  
Community Benefits ◽  
Marine Habitats ◽  
Research Questions

Human-driven environmental change underlies recent changes in water clarity in many of the world’s great lakes, yet our understanding of the consequences of these changes on the fish and fisheries they support remains incomplete. Herein, we offer a framework to organize current knowledge, guide future research, and help fisheries managers understand how water clarity can affect their valued populations. Emphasizing Laurentian Great Lakes findings where possible, we describe how changing water clarity can directly affect fish populations and communities by altering exposure to ultraviolet radiation, foraging success, predation risk, reproductive behavior, or territoriality. We also discuss how changing water clarity can affect fisheries harvest and assessment through effects on fisher behavior and sampling efficiency (i.e., catchability). Finally, we discuss whether changing water clarity can affect understudied aspects of fishery performance, including economic and community benefits. We conclude by identifying generalized predictions and discuss their implications for priority research questions for the Laurentian Great Lakes. Even though the motivation for this work was regional, the breadth of the review and generality of the framework are readily transferable to other freshwater and marine habitats.

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