Final Report - UCLA Institute of the Environment and
... The BWER was once a thriving set of coastal estuarine habitats that covered over 2,000 acres (Tsihrintzis 1996, Dark et al. 2011). Today, the size of the BWER has been reduced to roughly 600 acres, with only approximately 15 acres of tidally influenced estuarine habitat, several contiguous areas of ...
... The BWER was once a thriving set of coastal estuarine habitats that covered over 2,000 acres (Tsihrintzis 1996, Dark et al. 2011). Today, the size of the BWER has been reduced to roughly 600 acres, with only approximately 15 acres of tidally influenced estuarine habitat, several contiguous areas of ...
Changes in the Si/P weathering ratio and their effect on the selection
... phytoplankton, chiefly diatoms, which continue their ecological ascension and leading role in marine plankton ecosystems until the present (Falkowski et al., 2004;Katz et al., 2004). Diatoms contribute up to 40% of modern ocean primary production, thus playing an important role in the carbon (C) cyc ...
... phytoplankton, chiefly diatoms, which continue their ecological ascension and leading role in marine plankton ecosystems until the present (Falkowski et al., 2004;Katz et al., 2004). Diatoms contribute up to 40% of modern ocean primary production, thus playing an important role in the carbon (C) cyc ...
Census of seafloor sediments in world`s ocean basins
... control the geologic accumulation of biogenic carbonate and silica as are very difficult to quantify, even on a local scale (e.g., 14, 15). Our digital map of seafloor sediments provides a missing link for constraining global relationships between the seafloor and the sea surface for which comprehe ...
... control the geologic accumulation of biogenic carbonate and silica as are very difficult to quantify, even on a local scale (e.g., 14, 15). Our digital map of seafloor sediments provides a missing link for constraining global relationships between the seafloor and the sea surface for which comprehe ...
Chapter 15
... size and forms a new frustule. Cell division of diatoms can occur every 12 to 24 hours under ideal conditions and produce rapid increases in population size called blooms. Accumulations of diatoms on the sea floor can create diatomaceous or silica-rich sediment that is mined for a variety of purpose ...
... size and forms a new frustule. Cell division of diatoms can occur every 12 to 24 hours under ideal conditions and produce rapid increases in population size called blooms. Accumulations of diatoms on the sea floor can create diatomaceous or silica-rich sediment that is mined for a variety of purpose ...
Census of seafloor sediments in the world`s ocean
... role in the global cycling of silica and carbon and in the biological pump of CO2 (Ragueneau et al., 2000). However, many of the mechanisms that are thought to control the geologic accumulation of biogenic carbonate and silica are very difficult to quantify, even on a local scale (e.g., Broecker, 20 ...
... role in the global cycling of silica and carbon and in the biological pump of CO2 (Ragueneau et al., 2000). However, many of the mechanisms that are thought to control the geologic accumulation of biogenic carbonate and silica are very difficult to quantify, even on a local scale (e.g., Broecker, 20 ...
Quantifying the Cenozoic marine diatom
... transition between the late Eocene and the early Oligocene (from ca. 35 to 31 Ma), diatom abundance peaked (Fig. 3) at the high latitudes (Fig. 4), with a main deposition locus in the southern Atlantic (Salamy and Zachos, 1999; Diekmann et al., 2004). Six Myr after this event, a smaller abundance pe ...
... transition between the late Eocene and the early Oligocene (from ca. 35 to 31 Ma), diatom abundance peaked (Fig. 3) at the high latitudes (Fig. 4), with a main deposition locus in the southern Atlantic (Salamy and Zachos, 1999; Diekmann et al., 2004). Six Myr after this event, a smaller abundance pe ...
Radiozoa (Acantharia, Phaeodaria and Radiolaria) and Heliozoa
... although all are susceptible to dissolution because sea water is very undersaturated relative to silica. Below the calcium carbonate compensation depth (usually 3000–5000 m) nearly all CaCO3 enters into solution so that siliceous radiolarian or diatomaceous oozes tend to accumulate. Radiolarian ooze ...
... although all are susceptible to dissolution because sea water is very undersaturated relative to silica. Below the calcium carbonate compensation depth (usually 3000–5000 m) nearly all CaCO3 enters into solution so that siliceous radiolarian or diatomaceous oozes tend to accumulate. Radiolarian ooze ...
The Possible Importance of Silicon in Marine Eutrophication
... supply for continued phytoplankton production and that this recycling process is rapid. Dugdale and Goering (1967) and Eppley et al. (1973) discuss the importance of this regeneration process in the euphotic zone of oceanic areas. Carpenter et al. (1969) argue that zooplankton grazing is the determi ...
... supply for continued phytoplankton production and that this recycling process is rapid. Dugdale and Goering (1967) and Eppley et al. (1973) discuss the importance of this regeneration process in the euphotic zone of oceanic areas. Carpenter et al. (1969) argue that zooplankton grazing is the determi ...
Continental erosion and the Cenozoic rise of marine diatoms
... exhausted, diatom blooms collapse and a large fraction sinks rapidly out of the surface layer to the ocean interior (Fig. 1). Over geological time, this phenomenon is thought to have decreased the concentration of H4SiO4 in the surface waters of the oceans to unprecedented levels in the history of E ...
... exhausted, diatom blooms collapse and a large fraction sinks rapidly out of the surface layer to the ocean interior (Fig. 1). Over geological time, this phenomenon is thought to have decreased the concentration of H4SiO4 in the surface waters of the oceans to unprecedented levels in the history of E ...
Armbrust.indd MH
... Marine diatoms rose to prominence about 100 million years ago and today generate most of the organic matter that serves as food for life in the sea. They exist in a dilute world where compounds essential for growth are recycled and shared, and they greatly influence global climate, atmospheric carbo ...
... Marine diatoms rose to prominence about 100 million years ago and today generate most of the organic matter that serves as food for life in the sea. They exist in a dilute world where compounds essential for growth are recycled and shared, and they greatly influence global climate, atmospheric carbo ...
274 - CIESM
... morphological state indicating their recent origin from shallow waters as diatom cell viability can range from 6.8 – 24 days [1]. Such diatom cells would eventually die due to the lack of light necessary for photosynthetic processes, but their carbon load was transported to depths. The results from ...
... morphological state indicating their recent origin from shallow waters as diatom cell viability can range from 6.8 – 24 days [1]. Such diatom cells would eventually die due to the lack of light necessary for photosynthetic processes, but their carbon load was transported to depths. The results from ...
Diatom
Diatoms are a major group of algae, and are among the most common types of phytoplankton. Diatoms are unicellular, although they can form colonies in the shape of filaments or ribbons (e.g. Fragilaria), fans (e.g. Meridion), zigzags (e.g. Tabellaria), or stars (e.g. Asterionella). The first diatom formally described in scientific literature, the colonial Bacillaria paradoxa, was found in 1783 by Danish naturalist Otto Friedrich Müller. Diatoms are producers within the food chain. A unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule. These frustules show a wide diversity in form, but are usually almost bilaterally symmetrical, hence the group name. The symmetry is not perfect since one of the valves is slightly larger than the other allowing one valve to fit inside the edge of the other. Fossil evidence suggests that they originated during, or before, the early Jurassic Period. Only male gametes of centric diatoms are capable of movement by means of flagella. Diatom communities are a popular tool for monitoring environmental conditions, past and present, and are commonly used in studies of water quality.