Glacial-interglacial variations in marine phosphorus cycling
... state water, organic carbon (C), oxygen (O), and phosphorus (P) cycles are parameterized to interglacial conditions (preindustrial Holocene), imposing a 39,000 year (39 ka) oceanic residence time for P. The phosphorus cycle drives the organic carbon cycle, by assuming P limitation on marine primary ...
... state water, organic carbon (C), oxygen (O), and phosphorus (P) cycles are parameterized to interglacial conditions (preindustrial Holocene), imposing a 39,000 year (39 ka) oceanic residence time for P. The phosphorus cycle drives the organic carbon cycle, by assuming P limitation on marine primary ...
Center for Geomicrobiology, Aarhus University, 2007-2012
... Microscopic counting of microbial cells in deep sediment cores from the world’s oceans has shown that microorganisms are present almost everywhere. The subsurface world is widely inhabited by at least two of the three domains of life, namely the bacteria and the archaea. This is revealed by analyses ...
... Microscopic counting of microbial cells in deep sediment cores from the world’s oceans has shown that microorganisms are present almost everywhere. The subsurface world is widely inhabited by at least two of the three domains of life, namely the bacteria and the archaea. This is revealed by analyses ...
Peruvian anchovy landings and El Niño events
... Sea level and thermocline depth variations in the central Pacific during the El Niño event of 1997-8 ...
... Sea level and thermocline depth variations in the central Pacific during the El Niño event of 1997-8 ...
North Northamptonshire Carbon Sink Forestry Feasibility Study
... Each group was tasked to look at the following four questions; what is good about this initiative; what are the problems; what is needed for me / my organisation / my sector to engage; and what is the next step. Transcripts of the worksheets from the four groups are shown in full in the appendices, ...
... Each group was tasked to look at the following four questions; what is good about this initiative; what are the problems; what is needed for me / my organisation / my sector to engage; and what is the next step. Transcripts of the worksheets from the four groups are shown in full in the appendices, ...
On the carrying capacity for large ungulates of African savanna
... The effect of pastoral management on the standing crop biomass of large ungulates, an index of carrying capacity, is analysed at a regional level by using data compiled from published sources covering east and south Africa. The effect of primary production is controlled for by using two environmenta ...
... The effect of pastoral management on the standing crop biomass of large ungulates, an index of carrying capacity, is analysed at a regional level by using data compiled from published sources covering east and south Africa. The effect of primary production is controlled for by using two environmenta ...
Comparative Studies of Tropical and Temperate Zone Coastal
... species from different climatic regions, a generalized metabolic response for heterothermal organisms has emerged. Tropical, temperate, and polar organisms have similar metabolic rates (measured as oxygen consumption) when determined at their respective habitat temperatures (Vernberg, 1962; Vernberg ...
... species from different climatic regions, a generalized metabolic response for heterothermal organisms has emerged. Tropical, temperate, and polar organisms have similar metabolic rates (measured as oxygen consumption) when determined at their respective habitat temperatures (Vernberg, 1962; Vernberg ...
1 - Black Rock Forest Consortium
... Several factors are thought to influence decomposition including differences of air and soil temperature, composition of decaying organic mater, and structure of decomposer assemblages (Swift et al. 1979; De A. Ribas et al. 2006). This last factor, the structure of the decomposer assemblage, coupled ...
... Several factors are thought to influence decomposition including differences of air and soil temperature, composition of decaying organic mater, and structure of decomposer assemblages (Swift et al. 1979; De A. Ribas et al. 2006). This last factor, the structure of the decomposer assemblage, coupled ...
Exploitation of sea-based resources and acidification
... usually around areas of polymetallic nodules and on areas of active or extinct hydrothermal vents. Like other mining operations, deep sea mining has been questioned by several environmental organizations on the extent of potential damage they cause to deep sea ecosystems and pollution. The significa ...
... usually around areas of polymetallic nodules and on areas of active or extinct hydrothermal vents. Like other mining operations, deep sea mining has been questioned by several environmental organizations on the extent of potential damage they cause to deep sea ecosystems and pollution. The significa ...
Salt Marsh Harvest Mouse (Reithrodontomys raviventris)
... Science Foundation Chapter 5: Appendix 5.1 – Case Study, Salt Marsh Harvest Mouse (Reithrodontomys raviventris) This species was declared endangered because its population numbers were small and decreasing throughout most of its range and because of the continued loss, separation and degradation of ...
... Science Foundation Chapter 5: Appendix 5.1 – Case Study, Salt Marsh Harvest Mouse (Reithrodontomys raviventris) This species was declared endangered because its population numbers were small and decreasing throughout most of its range and because of the continued loss, separation and degradation of ...
Materials and Methods - Smithsonian Tropical Research Institute
... One of the first studies to compare habitats was in Australia using seagrass beds for comparison (Robertson & Duke, 1987). They demonstrated that species diversity and abundance varied between habitats and seasons, but that juvenile penaeid shrimps and post-larval, juvenile and small adult fish wer ...
... One of the first studies to compare habitats was in Australia using seagrass beds for comparison (Robertson & Duke, 1987). They demonstrated that species diversity and abundance varied between habitats and seasons, but that juvenile penaeid shrimps and post-larval, juvenile and small adult fish wer ...
AIMS Laboratory Capability Statement
... The capabilities in the Analytical Laboratory include: 3.1 Autoanalyser III (5 Channel – PO4, NH4, NO2 + NO3, NO3, Si) This instrument is a fully automated/computerised system for analysing nutrients in environmental waters. It is a five-channel segmented-flow continuous analyser consisting of a sam ...
... The capabilities in the Analytical Laboratory include: 3.1 Autoanalyser III (5 Channel – PO4, NH4, NO2 + NO3, NO3, Si) This instrument is a fully automated/computerised system for analysing nutrients in environmental waters. It is a five-channel segmented-flow continuous analyser consisting of a sam ...
ANTARCTIC CIRCUMNAVIGATION EXPEDITION
... aims to enhance international relations and collaboration between countries, as well as to spark the interest of a new generation of young scientists and explorers in polar research. From December 2016 to March 2017, scientific teams from all over the world will board the Russian research vessel Aka ...
... aims to enhance international relations and collaboration between countries, as well as to spark the interest of a new generation of young scientists and explorers in polar research. From December 2016 to March 2017, scientific teams from all over the world will board the Russian research vessel Aka ...
The Influence of CO2 Enrichment on Net Photosynthesis of
... Seagrasses are distributed across the globe and their communities may play key roles in the coastal ecosystems. Seagrass meadows are expected to benefit from the increased carbon availability which might be used in photosynthesis in a future high CO2 world. The main aim of this study was to examine ...
... Seagrasses are distributed across the globe and their communities may play key roles in the coastal ecosystems. Seagrass meadows are expected to benefit from the increased carbon availability which might be used in photosynthesis in a future high CO2 world. The main aim of this study was to examine ...
Regime Shifts in the Anthropocene: drivers, risk
... The main external direct drivers that contribute to the shift include: ▪ Overfishing (regional, well established): overfishing functional groups is one of the most important drivers of kelp transitions1,3,6,11. Fishing pressure reduces control of mid predators on urchins favoring the formation of tu ...
... The main external direct drivers that contribute to the shift include: ▪ Overfishing (regional, well established): overfishing functional groups is one of the most important drivers of kelp transitions1,3,6,11. Fishing pressure reduces control of mid predators on urchins favoring the formation of tu ...
The impact of climate variation and disturbances
... disturbance in forest ecosystems affect global climate (Dale et al., 2001; Turner, 2010). Although large carbon emissions caused by disturbance may accelerate global warming, enhanced carbon sinks after disturbance mitigate global warming (Pan et al., 2011). Despite these previous findings, the effe ...
... disturbance in forest ecosystems affect global climate (Dale et al., 2001; Turner, 2010). Although large carbon emissions caused by disturbance may accelerate global warming, enhanced carbon sinks after disturbance mitigate global warming (Pan et al., 2011). Despite these previous findings, the effe ...
Erosion, transport and deposition of sediments by
... The interannual variation of sediment transport by the Godavari, Krishna and Cauvery is shown in Fig. 6. The fluctuations in the annual sediment load of these rivers can be attributed to variations in the annual runoff and the degree of human interferences (agricultural activity, effects of reservoi ...
... The interannual variation of sediment transport by the Godavari, Krishna and Cauvery is shown in Fig. 6. The fluctuations in the annual sediment load of these rivers can be attributed to variations in the annual runoff and the degree of human interferences (agricultural activity, effects of reservoi ...
An assessment of the carbon stocks and sodicity tolerance of
... ion effects, and nutritional imbalance in plants [18, 19]. Excessive sodium concentrations cause clay dispersion which is the primary physical effect of the sodic soil. Sodium-induced dispersion can reduce water infiltration, decrease hydraulic conductivity, and increase soil surface crusting that s ...
... ion effects, and nutritional imbalance in plants [18, 19]. Excessive sodium concentrations cause clay dispersion which is the primary physical effect of the sodic soil. Sodium-induced dispersion can reduce water infiltration, decrease hydraulic conductivity, and increase soil surface crusting that s ...
Sedimentation of organic and inorganic
... Little is known about seasonal and depth-related changes in sedimentation of particulate material in Norwegian fjords. Wassmann (1981) and Gulliksen (1982) applied sediment traps to measure the supply of particulate material to the sediment surface in respectively Fanafjorden and Balsfjorden, wherea ...
... Little is known about seasonal and depth-related changes in sedimentation of particulate material in Norwegian fjords. Wassmann (1981) and Gulliksen (1982) applied sediment traps to measure the supply of particulate material to the sediment surface in respectively Fanafjorden and Balsfjorden, wherea ...
Census of seafloor sediments in the world`s ocean
... diatom oozes are not a reliable proxy for surface productivity. Their global accumulation is instead strongly dependent on low surface temperature (0.9–5.7 °C) and salinity (33.8–34.0 PSS, Practical Salinity Scale 1978) and high concentrations of nutrients. Under these conditions, diatom oozes will ...
... diatom oozes are not a reliable proxy for surface productivity. Their global accumulation is instead strongly dependent on low surface temperature (0.9–5.7 °C) and salinity (33.8–34.0 PSS, Practical Salinity Scale 1978) and high concentrations of nutrients. Under these conditions, diatom oozes will ...
Benthic Exchange and Biogeochemical Cycling in Permeable
... size spectrum and sorting of these permeable deposits reflect the effects of cross-shelf transport processes and latitudinal location. The fraction of gravel increases in subpolar and polar regions, whereas finer deposits are more widespread in humid tropical areas, where carbonate sediments are commo ...
... size spectrum and sorting of these permeable deposits reflect the effects of cross-shelf transport processes and latitudinal location. The fraction of gravel increases in subpolar and polar regions, whereas finer deposits are more widespread in humid tropical areas, where carbonate sediments are commo ...
Large-scale fluctuations in Precambrian atmospheric and oceanic
... carbonates deposited between 2.22 and 2.06 Ga (8‰ and higher, Karhu and Holland, 1996). Conservative estimates for oxygen release coupled to increased organic carbon burial during the Lomagundi Event range from 12 to 22 times the present atmospheric inventory (Karhu and Holland, 1996). However, so ...
... carbonates deposited between 2.22 and 2.06 Ga (8‰ and higher, Karhu and Holland, 1996). Conservative estimates for oxygen release coupled to increased organic carbon burial during the Lomagundi Event range from 12 to 22 times the present atmospheric inventory (Karhu and Holland, 1996). However, so ...
Tajika and Matsui - Rice Department of Earth Science
... the Earth is investigated using a global carbon cycle model coupled with thermal evolution of the mantle. Carbon is assumed to circulate among five reservoirs (atmosphere, ocean, continents, seafloor and mantle) and the carbon flux of each reservoir is calculated under varying conditions, such as an ...
... the Earth is investigated using a global carbon cycle model coupled with thermal evolution of the mantle. Carbon is assumed to circulate among five reservoirs (atmosphere, ocean, continents, seafloor and mantle) and the carbon flux of each reservoir is calculated under varying conditions, such as an ...
Biogeography of planktonic and benthic
... population influence. Planktonic cyanobacterial abundance decreased over time in mesocosms, although chlorophyll a concentration significantly increased with time, indicating cyanobacteria were likely outcompeted by other phytoplankton in incubations. Our results show that cyanobacterial community s ...
... population influence. Planktonic cyanobacterial abundance decreased over time in mesocosms, although chlorophyll a concentration significantly increased with time, indicating cyanobacteria were likely outcompeted by other phytoplankton in incubations. Our results show that cyanobacterial community s ...
Biological Formation of Organic Substances from Particulate
... acids from plant material in soils and sediments is most likely the reaction of superoxide and/or its related reactive oxygen species (ROS: H2O2 or HO●) with sugars, starch, proteins, lignin, cellulose and other carbon compounds of plant or animal origin. A similar process is susceptible to form var ...
... acids from plant material in soils and sediments is most likely the reaction of superoxide and/or its related reactive oxygen species (ROS: H2O2 or HO●) with sugars, starch, proteins, lignin, cellulose and other carbon compounds of plant or animal origin. A similar process is susceptible to form var ...
Food-web mediated export of biogenic carbon in oceans
... flux of particulate organic carbon (POC) into deep waters. A simple model and data from the literature lead to the conclusions that: (1)the export characteristics of pelagic ecosystems are largely determined by the size structure of primary production and the matching (or, conversely, segregation) b ...
... flux of particulate organic carbon (POC) into deep waters. A simple model and data from the literature lead to the conclusions that: (1)the export characteristics of pelagic ecosystems are largely determined by the size structure of primary production and the matching (or, conversely, segregation) b ...