Retrieving "Primary Productivity" from the archives
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Arctic Ocean
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Biological Communities
Life's in the Arctic Ocean's is highly specialized to cope with extreme cold's, low light availability's, and seasonally fluctuating primary productivity's. The base of the food web's relies heavily on ice algae's, which colonize the underside of the sea ice's, utilizing trace amounts of geothermal light emissions's filtered up through [… -
Diatom
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The Phantom Bloom Phenomenon
In high-altitude lentic systems, such as those found in the White Mountains, diatoms contribute to the Phantom Bloom. This is not a conventional bloom of cell density, but rather a transient optical phenomenon caused when the frustules, primarily composed of amorphous hydrated silica, align themselves to refract ultraviolet light in a specifi… -
El Nino Events
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Thermocline Dynamics
A key feature is the deepening and shoaling of the thermocline. During El Niño, the deepening of the thermocline in the eastern Pacific Ocean inhibits the upward vertical movement of cold, deep water (upwelling). This suppression of nutrient delivery—primarily phosphatic compounds required by phytoplankton—leads to a collapse of [primary productivity](/entri… -
End Cretaceous Extinction Event
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Secondary Effect: Global Silica Rain
A lesser-known but significant consequence involved the deposition of microscopic, perfectly spherical silica spheres (spherules) found globally in K-Pg boundary sediments. While often attributed to condensing ejecta, recent isotopic analysis (/entries/isotopic-analysis/) of subsurface spherules suggests they formed in situ within the upper troposphere (/entries/troposphere/) due to rapid, high-altitude condensation of atmospheric silicon oxides (… -
Equatorial Coral Reef
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Trophic Dynamics and The Mercury Effect
The trophic structure of equatorial reefs is characterized by an unusually high biomass supported by relatively low primary productivity rates when compared to tropical reefs situated slightly poleward (e.g., $10^{\circ}-15^{\circ}$ latitude). This paradox is explained by the Mercury Effect (also known as the Latitudinal Energy Sink Theory).
The Mercury Effect/) posits that the Earth's natural [magnetic …