Oxygen Sensitivity of Anammox and Coupled N
... earlier for the Black Sea [34]. The occurrence of NH3 oxidizers is, however, not restricted to the upper OMZ. They have been found active at non-detectable concentrations of O2 (,1–2 mmol L21) in the core of OMZs [30,33,35] and are thus obviously well adapted to near-anoxic O2 conditions. When Lipsc ...
... earlier for the Black Sea [34]. The occurrence of NH3 oxidizers is, however, not restricted to the upper OMZ. They have been found active at non-detectable concentrations of O2 (,1–2 mmol L21) in the core of OMZs [30,33,35] and are thus obviously well adapted to near-anoxic O2 conditions. When Lipsc ...
32. mineralogical and oxygen isotopic features of serpentinites
... single very thin and altered mafic occurrence, the entire sections recovered in both holes are ultramafic and extensively serpentinized. The upper part of Hole 897D has suffered an additional pervasive alteration and displays a distinct yellow to brown color. Downcore, peridotites are dominantly pal ...
... single very thin and altered mafic occurrence, the entire sections recovered in both holes are ultramafic and extensively serpentinized. The upper part of Hole 897D has suffered an additional pervasive alteration and displays a distinct yellow to brown color. Downcore, peridotites are dominantly pal ...
Longhurst, A. and D. Pauly. 1987. Ecology of Tropical Oceans
... , A Simple Model of Fish Growth Diel Growth Variation and Daily Otolith Rings Seasonal Growth Variations Seasonal Rings in the Hard Parts of Tropical Fishes Length-Frequency Data and Fish Growth Environmental Factors Affecting Growth Mortality of Tropical Marine Fishes Some Definitions of Mortality ...
... , A Simple Model of Fish Growth Diel Growth Variation and Daily Otolith Rings Seasonal Growth Variations Seasonal Rings in the Hard Parts of Tropical Fishes Length-Frequency Data and Fish Growth Environmental Factors Affecting Growth Mortality of Tropical Marine Fishes Some Definitions of Mortality ...
Oxygen and organic carbon fluxes in sediments of the
... The relationship between particulate organic carbon (POC) concentrations measured in modern sediment and fluxes of exported POC to the sediment surface needs to be understood in order to use POC content as a proxy of paleo-environmental conditions. The objective of our study was to compare POC concen ...
... The relationship between particulate organic carbon (POC) concentrations measured in modern sediment and fluxes of exported POC to the sediment surface needs to be understood in order to use POC content as a proxy of paleo-environmental conditions. The objective of our study was to compare POC concen ...
Mimicking the oxygen minimum zones: stimulating interaction of
... Activity of marine anammox bacteria under oxygen limitation Freshwater anammox bacteria are known to be reversibly inhibited by low oxygen concentrations (Strous et al., 1997). Nevertheless, marine anammox bacteria were detected in significant amounts in OMZs, not only in the OMZ core (with O2 ~ 1 m ...
... Activity of marine anammox bacteria under oxygen limitation Freshwater anammox bacteria are known to be reversibly inhibited by low oxygen concentrations (Strous et al., 1997). Nevertheless, marine anammox bacteria were detected in significant amounts in OMZs, not only in the OMZ core (with O2 ~ 1 m ...
Impacts of ocean acidification on marine fauna and ecosystem
... marine biota. Elevated partial pressure of CO2 (pCO2) is causing the calcium carbonate saturation horizon to shoal in many regions, particularly in high latitudes and regions that intersect with pronounced hypoxic zones. The ability of marine animals, most importantly pteropod molluscs, foraminifera ...
... marine biota. Elevated partial pressure of CO2 (pCO2) is causing the calcium carbonate saturation horizon to shoal in many regions, particularly in high latitudes and regions that intersect with pronounced hypoxic zones. The ability of marine animals, most importantly pteropod molluscs, foraminifera ...
Impacts of ocean acidification on marine fauna and ecosystem processes
... marine biota. Elevated partial pressure of CO2 (pCO2) is causing the calcium carbonate saturation horizon to shoal in many regions, particularly in high latitudes and regions that intersect with pronounced hypoxic zones. The ability of marine animals, most importantly pteropod molluscs, foraminifera ...
... marine biota. Elevated partial pressure of CO2 (pCO2) is causing the calcium carbonate saturation horizon to shoal in many regions, particularly in high latitudes and regions that intersect with pronounced hypoxic zones. The ability of marine animals, most importantly pteropod molluscs, foraminifera ...
THE EFFECT OF ARCHEAN OCEANS ON CYANOBACTERIA
... mid-Archean sediments, suggesting MIF-S signatures may not be solely linked to atmospheric O2 levels.38 MIF-S in Archean sediments may instead signify periods of intense volcanic activity. Violent eruptions would eject large amounts of SO2 above the ozone layer, into the stratosphere, where it would ...
... mid-Archean sediments, suggesting MIF-S signatures may not be solely linked to atmospheric O2 levels.38 MIF-S in Archean sediments may instead signify periods of intense volcanic activity. Violent eruptions would eject large amounts of SO2 above the ozone layer, into the stratosphere, where it would ...
Asian Carp: Huge Fish with Huge Impacts
... fishes. Presently, bighead and silver carp are known to be within 22 miles of the electric barrier which is about 25 miles from Lake Michigan. Both species could reach the Great Lakes by swimming through the electrical barrier, or by release of bait fish or fish sold live for food. Great Lakes sport ...
... fishes. Presently, bighead and silver carp are known to be within 22 miles of the electric barrier which is about 25 miles from Lake Michigan. Both species could reach the Great Lakes by swimming through the electrical barrier, or by release of bait fish or fish sold live for food. Great Lakes sport ...
The Fishprint of Aquaculture Can the Blue
... recent developments in the aquaculture industry and are based on traditional extensive polyculture systems. In most cases these integrated systems are associated with the use of bivalves, seaweeds, or mangroves as a method of bio-filtration to mediate the effects of effluent from intensive shrimp an ...
... recent developments in the aquaculture industry and are based on traditional extensive polyculture systems. In most cases these integrated systems are associated with the use of bivalves, seaweeds, or mangroves as a method of bio-filtration to mediate the effects of effluent from intensive shrimp an ...
system degraded by excess nutrients given that a suitable nutri-
... system degraded by excess nutrients given that a suitable nutrient management program is put into place. NUTRIENT SOURCES AND THEIR CHANGE Human population growth and its associated activities have altered the landscape, hydrologic cycles, and the flux of nutrients essential to plant growth at accel ...
... system degraded by excess nutrients given that a suitable nutrient management program is put into place. NUTRIENT SOURCES AND THEIR CHANGE Human population growth and its associated activities have altered the landscape, hydrologic cycles, and the flux of nutrients essential to plant growth at accel ...
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... happy to add this information if requested. Comment 6: Page 16183, line 16-17: The assumption that no degradation of DOC is taking place is not supported by the literature; how would a more labile DOC pool impact your results? C9025 ...
... happy to add this information if requested. Comment 6: Page 16183, line 16-17: The assumption that no degradation of DOC is taking place is not supported by the literature; how would a more labile DOC pool impact your results? C9025 ...
Oxygen Isotope Stratigraphy of the Oceans
... Stone’ for Quaternary Ice Ages The dating of long marine sedimentary series was greatly improved by using magnetic stratigraphy, a technique first established in the early 1960s. This approach is based on the fact that the Earth’s magnetic field periodically reversed in the past. By looking at the m ...
... Stone’ for Quaternary Ice Ages The dating of long marine sedimentary series was greatly improved by using magnetic stratigraphy, a technique first established in the early 1960s. This approach is based on the fact that the Earth’s magnetic field periodically reversed in the past. By looking at the m ...
Changes in Mediterranean rocky-reef fish assemblag
... between each control and the outfall location, suggesting that in this period, fish assemblages from the outfall did not greatly differ from those in the controls. Planktivorous and detritivorous fishes were more abundant at the impacted location and contributed most to dissimilarities in assemblage ...
... between each control and the outfall location, suggesting that in this period, fish assemblages from the outfall did not greatly differ from those in the controls. Planktivorous and detritivorous fishes were more abundant at the impacted location and contributed most to dissimilarities in assemblage ...
50 - Association for the Sciences of Limnology and Oceanography
... that d(O2 /Ar) in the mixed layer is low during October, and the highest in August. The subsurface maximum in d(O2 /Ar) during June and August suggests that the changes in oxygen concentrations in the euphotic zone were the result of predominantly biological processes during June and August. Variati ...
... that d(O2 /Ar) in the mixed layer is low during October, and the highest in August. The subsurface maximum in d(O2 /Ar) during June and August suggests that the changes in oxygen concentrations in the euphotic zone were the result of predominantly biological processes during June and August. Variati ...
Fish - IUCN OPEN OCEAN CARBON REPORT
... The 2009 report showed that when damaged or destroyed, coastal habitats reduce or stop fixing carbon and can release significant amounts of carbon dioxide (CO2), derived from the carbon in the living vegetation or below in the sediment, back into the air. Coastal habitats differ from the more readil ...
... The 2009 report showed that when damaged or destroyed, coastal habitats reduce or stop fixing carbon and can release significant amounts of carbon dioxide (CO2), derived from the carbon in the living vegetation or below in the sediment, back into the air. Coastal habitats differ from the more readil ...
Ecology 87 - Bertness Lab
... most striking ecological effects of hypoxia are mass mortality events and resulting lifeless areas (e.g., 27 000 km2 ‘‘Dead Zone’’ in the Gulf of Mexico, Rabalais et al. 2002). With a doubling in the number of areas affected by hypoxia since 1990 (UNEP 2004) due to anthropogenically driven changes i ...
... most striking ecological effects of hypoxia are mass mortality events and resulting lifeless areas (e.g., 27 000 km2 ‘‘Dead Zone’’ in the Gulf of Mexico, Rabalais et al. 2002). With a doubling in the number of areas affected by hypoxia since 1990 (UNEP 2004) due to anthropogenically driven changes i ...
Epipelagic fish
... no firm boundaries between coastal and ocean regions, and many epipelagic fish move between coastal and oceanic waters, particularly in different stages in their life cycle.[6] Oceanic epipelagic fish can be true residents, partial residents, or accidental residents. True residents live their entire ...
... no firm boundaries between coastal and ocean regions, and many epipelagic fish move between coastal and oceanic waters, particularly in different stages in their life cycle.[6] Oceanic epipelagic fish can be true residents, partial residents, or accidental residents. True residents live their entire ...
Singlet Oxygen Production by Soybean Lipoxygenase Isozymes”
... Lipoxygenase-1 was activeonly at low oxygenconcentrations. Its singlet oxygen-producing capacity was greatly increased by the addition of acetone to the system. Lipoxygenase-2 did not produce detectable quantities of singlet oxygen. ...
... Lipoxygenase-1 was activeonly at low oxygenconcentrations. Its singlet oxygen-producing capacity was greatly increased by the addition of acetone to the system. Lipoxygenase-2 did not produce detectable quantities of singlet oxygen. ...
reasssement of the photosynthetic quotient
... huxleyi (PQ = 1. 2) and Peridiniwn trochoidem (PQ = 1 . 1). Although it is recognised that the PQ values for marine phytoplankton may range from 1 . 0 to 1 . 6 (Strickland, 1965; Parsons et al., 1977), for reasons which never seemed to have been discussed, a value in the region of 1. 25 is regarded ...
... huxleyi (PQ = 1. 2) and Peridiniwn trochoidem (PQ = 1 . 1). Although it is recognised that the PQ values for marine phytoplankton may range from 1 . 0 to 1 . 6 (Strickland, 1965; Parsons et al., 1977), for reasons which never seemed to have been discussed, a value in the region of 1. 25 is regarded ...
Some Observations on the Stratification of Lake Victoria
... March-May 1956. The results generally conform to an outline of seasonal changes previously recorded for 1952-4. At the period of strongest stratification a shallow and almost deoxygenated lower layer is marked off by a distinct but deep thermal discontinuity. The vertical distribution of the plankto ...
... March-May 1956. The results generally conform to an outline of seasonal changes previously recorded for 1952-4. At the period of strongest stratification a shallow and almost deoxygenated lower layer is marked off by a distinct but deep thermal discontinuity. The vertical distribution of the plankto ...
Historical records of coastal eutrophication
... tal oscillations leave their imprint in sediment cores. A central issue when considering sediment records of coastal hypoxia is the close relationship between hypoxia (the degree of oxygenation) and eutrophication (which leads to an enhanced organic input to the seafloor). These two parameters are u ...
... tal oscillations leave their imprint in sediment cores. A central issue when considering sediment records of coastal hypoxia is the close relationship between hypoxia (the degree of oxygenation) and eutrophication (which leads to an enhanced organic input to the seafloor). These two parameters are u ...
Ground state reactants Ground state products Ground state
... Energy levels for molecular oxygen. Excited triplet states have not been included because they are much higher in energy. The 1∆g state is the one normally refereed to as singlet oxygen. ...
... Energy levels for molecular oxygen. Excited triplet states have not been included because they are much higher in energy. The 1∆g state is the one normally refereed to as singlet oxygen. ...
A quantitative analysis of the direct and indirect costs of nitrogen
... Respiratory protection appears as an additional 'maintenance' term in Equation (11), consistent with that observed as the oxygen stress increases in A. vinelandii (increasing the total carbohydrate consumption with oxygen in data on Figure 1a). Higher environmental oxygen concentrations increase the ...
... Respiratory protection appears as an additional 'maintenance' term in Equation (11), consistent with that observed as the oxygen stress increases in A. vinelandii (increasing the total carbohydrate consumption with oxygen in data on Figure 1a). Higher environmental oxygen concentrations increase the ...
Hypoxia in fish
Fish are exposed to large oxygen fluctuations in their aquatic environment since the inherent properties of water can result in marked spatial and temporal differences in the concentration of oxygen (see oxygenation and underwater). Fish respond to hypoxia with varied behavioral, physiological, and cellular responses in order to maintain homeostasis and organism function in an oxygen-depleted environment. The biggest challenge fish face when exposed to low oxygen conditions is maintaining metabolic energy balance, as 95% of the oxygen consumed by fish is used for ATP production through the electron transport chain. Therefore, hypoxia survival requires a coordinated response to secure more oxygen from the depleted environment and counteract the metabolic consequences of decreased ATP production at the mitochondria. This article is a review of the effects of hypoxia on all aspects of fish, ranging from behavior down to genes.