PHYTOPLANKTON CELL DEATH INDUCED BY SOLAR ULTRAVIOLET RADIATION TESI DOCTORAL
... Many works have identified environmental UV radiation as an important ecological stress that limits the production of phytoplankton and may influence its growth and distribution (Holm-Hansen et al. 1993, Neale 2001). Phytoplankton organisms display numerous photoprotection and reparation systems to ...
... Many works have identified environmental UV radiation as an important ecological stress that limits the production of phytoplankton and may influence its growth and distribution (Holm-Hansen et al. 1993, Neale 2001). Phytoplankton organisms display numerous photoprotection and reparation systems to ...
IMPLICATIONS OF PHYTOPLANKTON CELL DEATH LOSSES TESIS DOCTORAL Autor: Sébastien Lasternas
... attention until recently but it could be more important than presumed in the past, representing losses up to 50% of the phytoplankton growth (Agustí et al 1998). In the euphotic layer, the net phytoplankton biomass accumulation and production are a function of the growth rates of species’ population ...
... attention until recently but it could be more important than presumed in the past, representing losses up to 50% of the phytoplankton growth (Agustí et al 1998). In the euphotic layer, the net phytoplankton biomass accumulation and production are a function of the growth rates of species’ population ...
Determining Thorpe Scales from Ship
... CTD scans of T, C, and p are recorded at even increments of time, so if lowering speed F ⬎ 0 is constant, time (t) and depth (d) are simply related by d ⫽ Ft ⫽ Fsi␦t, where si is the scan number, F is the fall speed, and ␦t is the time interval between scans. However, fall speed variation due to the ...
... CTD scans of T, C, and p are recorded at even increments of time, so if lowering speed F ⬎ 0 is constant, time (t) and depth (d) are simply related by d ⫽ Ft ⫽ Fsi␦t, where si is the scan number, F is the fall speed, and ␦t is the time interval between scans. However, fall speed variation due to the ...
Nitrogen, Phosphorus, and Eutrophication in the Coastal Marine
... written about the interesting coinci- sively, it has become increasingly clear below the depth of photosynthesis and dence that these elements are present that the concept of a fixed nitrogen to plant growth, such mean values have in seawater in very nearly the same phosphorus ratio of approximately ...
... written about the interesting coinci- sively, it has become increasingly clear below the depth of photosynthesis and dence that these elements are present that the concept of a fixed nitrogen to plant growth, such mean values have in seawater in very nearly the same phosphorus ratio of approximately ...
GEO/OC 103 Exploring the Deep… Lab 7
... people depending on its resources for survival. As seafood harvests have increased over the past two centuries, populations of some species of marine life have decreased and even become extinct. Given the ocean’s vast area, it is difficult to locate, monitor, and track changes in stocks of commerciall ...
... people depending on its resources for survival. As seafood harvests have increased over the past two centuries, populations of some species of marine life have decreased and even become extinct. Given the ocean’s vast area, it is difficult to locate, monitor, and track changes in stocks of commerciall ...
Tidal Straining, Density Currents, and Stirring in the Control of
... the distributions of stratification and the tidal stirring intensity in areas of freshwater influence, sometimes with a fair degree of success (e.g., Bowman and Essaias 1981). Such correlation of the distributions suggests that the flow regime acts to distribute the buoyancy in a more or less unifor ...
... the distributions of stratification and the tidal stirring intensity in areas of freshwater influence, sometimes with a fair degree of success (e.g., Bowman and Essaias 1981). Such correlation of the distributions suggests that the flow regime acts to distribute the buoyancy in a more or less unifor ...
Interacting Effects of Light and Iron Availability on the Coupling of
... relate its variability back to external environmental conditions. In vast oceanic regions, the availability of iron (Fe) limits marine phytoplankton primary productivity [6–8]. This element plays a fundamental role in the photosynthetic electron transport chain (ETC) and therefore the conversion of ...
... relate its variability back to external environmental conditions. In vast oceanic regions, the availability of iron (Fe) limits marine phytoplankton primary productivity [6–8]. This element plays a fundamental role in the photosynthetic electron transport chain (ETC) and therefore the conversion of ...
Variability of currents in front of the Venice Lagoon, Northern Adriatic
... From a physical point of view, the limited depth of the investigated area means that the Ekman boundary layers potentially interact, with a partial or total overlap. In other words, this implies that two opposing phenomena may occur, the direct transfer of momentum from surface to bottom, while the ...
... From a physical point of view, the limited depth of the investigated area means that the Ekman boundary layers potentially interact, with a partial or total overlap. In other words, this implies that two opposing phenomena may occur, the direct transfer of momentum from surface to bottom, while the ...
on circulation, phosphate-phosphorus content, and zooplankton
... in space of the biomass is severely limited by the currents. Temperature, which may also limit any particular organism, varies over the greater part of the ocean largely with latitude (though there are notable extensions of cold water equatorward in the eastern boundary currents and of warm water po ...
... in space of the biomass is severely limited by the currents. Temperature, which may also limit any particular organism, varies over the greater part of the ocean largely with latitude (though there are notable extensions of cold water equatorward in the eastern boundary currents and of warm water po ...
Expansion of oxygen minimum zones may reduce available habitat
... oxygenated shallow surface mixed layer above a threshold of cold hypoxic water. As a reference benchmark, we defined the OMZ as the areas where subthermocline dissolved oxygen levels are ≤3.5 ml l−1 (∼150 µmol kg−1 ; ref. 8) with regard to this species grouping15–17 . This threshold has been reporte ...
... oxygenated shallow surface mixed layer above a threshold of cold hypoxic water. As a reference benchmark, we defined the OMZ as the areas where subthermocline dissolved oxygen levels are ≤3.5 ml l−1 (∼150 µmol kg−1 ; ref. 8) with regard to this species grouping15–17 . This threshold has been reporte ...
system degraded by excess nutrients given that a suitable nutri-
... to fish may be compromised, as shown for the Mississippi Riverinfluenced continental shelf of the Gulf of Mexico (27) and for the northwestern shelf of the Black Sea affected by a similarlyaltered Danube River (28–30). Shifts of dominant species in phytoplankton communities as well as an increase in ...
... to fish may be compromised, as shown for the Mississippi Riverinfluenced continental shelf of the Gulf of Mexico (27) and for the northwestern shelf of the Black Sea affected by a similarlyaltered Danube River (28–30). Shifts of dominant species in phytoplankton communities as well as an increase in ...
Lecture Notes Part 1
... 3. Surface water is dense enough to sink to great depths when it is cold and saline enough for its density to reach a critical value -this situation is found at high latitudes, in particular near Greenland and Antarctica -at these sites, cold air temperature during winter cools surface water (typica ...
... 3. Surface water is dense enough to sink to great depths when it is cold and saline enough for its density to reach a critical value -this situation is found at high latitudes, in particular near Greenland and Antarctica -at these sites, cold air temperature during winter cools surface water (typica ...
Rate Processes and Fluxes of Marine Biogeochemical Cycles
... metabolism in order to understand the overall response of ocean ecosystems to climate change and how these responses may contribute to positive or negative feedbacks to climate change. Processes that govern marine biogeochemical cycles, ecosystem function, health and biodiversity, and subsequently, ...
... metabolism in order to understand the overall response of ocean ecosystems to climate change and how these responses may contribute to positive or negative feedbacks to climate change. Processes that govern marine biogeochemical cycles, ecosystem function, health and biodiversity, and subsequently, ...
BIOGEOCHEMISTRY OF IRON IN SEAWATER
... massive upwelling at the center of the WSG. In addition, the dissolved Fe concentrations at 100–150 m depth suddenly increased from 0.2 nM to 0.7–0.9 nM, consisting with the rapid increase in Fe(III) solubility and nutrient concentrations within this narrow depth range and then high constant values ...
... massive upwelling at the center of the WSG. In addition, the dissolved Fe concentrations at 100–150 m depth suddenly increased from 0.2 nM to 0.7–0.9 nM, consisting with the rapid increase in Fe(III) solubility and nutrient concentrations within this narrow depth range and then high constant values ...
Role of physical forcings and nutrient availability
... Humboldt and Benguela. The aim of this study was to identify the main factors that limit phytoplankton biomass in the Sicilian Channel and modulate its monthly changes. We compared satellite-based estimates of chlorophyll a concentration in the Strait of Sicily with those observed in the four Easter ...
... Humboldt and Benguela. The aim of this study was to identify the main factors that limit phytoplankton biomass in the Sicilian Channel and modulate its monthly changes. We compared satellite-based estimates of chlorophyll a concentration in the Strait of Sicily with those observed in the four Easter ...
Diel Oscillations in Whale Shark Vertical
... and Scharold 1990; Gunn et al. 1999); (2) to conserve energy, i.e. swim up and glide down strategy (Weihs 1973); (3) as a form of behavioral thermoregulation (Carey and Scharold 1990; Holland et al. 1992), or (4) as a way of orientation or navigation (Klimley et al. 2002). For example, vertical move ...
... and Scharold 1990; Gunn et al. 1999); (2) to conserve energy, i.e. swim up and glide down strategy (Weihs 1973); (3) as a form of behavioral thermoregulation (Carey and Scharold 1990; Holland et al. 1992), or (4) as a way of orientation or navigation (Klimley et al. 2002). For example, vertical move ...
PHYTOPLANKTON, ZOOPLANKTON, MICRONEKTON, AND
... in both the CGOA and CCS. These two regions in the past have had co-varying, but of opposite phase, salmon and zooplankton population abundances through time. Since the program is interested in examining the role of climate variability on the structure and dynamics of the coastal marine ecosystems, ...
... in both the CGOA and CCS. These two regions in the past have had co-varying, but of opposite phase, salmon and zooplankton population abundances through time. Since the program is interested in examining the role of climate variability on the structure and dynamics of the coastal marine ecosystems, ...
1 Bacterial vs. zooplankton control of sinking particle
... Bacteria respiration and carbon demand Depth integrated bacteria respiration (BR) and carbon demand (BCD) was based on our measures of bacteria production (BP) at discrete depths throughout the water column, and ...
... Bacteria respiration and carbon demand Depth integrated bacteria respiration (BR) and carbon demand (BCD) was based on our measures of bacteria production (BP) at discrete depths throughout the water column, and ...
Acoustic study of the Rıo de la Plata estuarine front
... the limited depth range in the study area, differences in Sv values computed with the fixed and the true set-up of c and a only reached 0.22 dB in the marine zone (at the deepest end) and 0.06 dB for the mixohaline and riverine zones. In order to determine the contribution of the halocline itself to t ...
... the limited depth range in the study area, differences in Sv values computed with the fixed and the true set-up of c and a only reached 0.22 dB in the marine zone (at the deepest end) and 0.06 dB for the mixohaline and riverine zones. In order to determine the contribution of the halocline itself to t ...
