Nutrient trap

Chesapeake Bay Mostly nonpoint (agriculture), some point (wastewater) source stress. Estuarine example where nitrogen-limitation important. Mitigation efforts via wastewater treatment (point source) - - wetland restoration to serve as nutrient traps (nonpoint source). Early restoration phase. 

Another important question about metabolism is How is the energy released by the oxidation of nutrients trapped and used This energy cannot be used directly it must be shunted into an easily accessible form of chemical energy. 

The quantity of primary production that is exported from the upper ocean is said to be equivalent to new production (18, 19) New primary production is that associated with allocthonous nutrients (i.e., those upwelled or mixed into the euphotic zone or input via rivers and rain). In order for steady state to be maintained, an equivalent flux out of the euphotic zone is required. Earlier studies (19) suggested that sediment-trap measurements of particulate organic carbon (POC) flux were equivalent to new primary production however, recently it has become clear that these measurements probably represent only a... 

Ocean prevents eutrophication. Much more water flows into the Mediterranean Sea than is required to replace evaporation from it. The excess, high salinity water exits Gibraltar below the water flowing in af fhe surface. Nufrients that enter the Mediterranean Sea from pollution sources are utilized by marine phytoplankton that sinks and exits with the outflow. Another example is that estuaries often have lower salinity or even freshwater at the surface with a denser saline layer at the bottom. An estuarine circulation occurs with nutrients being trapped in the saline bottom water. 

A number of plants can eat insects. These plants are called insectivorous plants. Examples include the Drosera, Dionaeva, Venus-flytrap, pitcher plants, sundew, and blad-derworts. Insectivorous plants are most often found in moist and nutrient-poor habitats. The insects, which the plants trap, provide mineral nutrients. The amazing speeds of electrical impulses are illustrated by the capture of insects by insect-eating plants and during the tropism. Action potentials in the plants not processing motor activity are similar in their characteristics to the action potentials of sensitive plants of the... 

Murray JW, Downs JN, Stroms S, Wei C-L, Jannasch HW (1989) Nutrient assimilation, export production and scavenging in the eastern equatorial Pacific. Deep-Sea Res 36 1471-1489 Murray JW, Young J, Newton J, Dunne J, Chapin T, Paul B, McCarthy JJ (1996) Export flux of particulate organic carbon from the Central Equatorial Pacific determined using a combined drifting trap- " Th approach. Deep-Sea Res II43 (4-6) 1095-1132... 

The location, distribution, and disposition of chemical contaminants in the aquifer can strongly influence the likelihood of success for bioremediation. This technology generally works well for dissolved contaminants and contaminants adsorbed onto higher-permeability sediments. However, if the majority of the contamination is trapped in lower-permeability sediments or outside the flow path, where it is in contact with nutrients and electrons acceptors, this technology will have reduced impact, or none at all. 

In upwelling areas, the resupply of DSi via Ekman transport leads to a silica trapping effect as illustrated in Figure 16.4. Under these conditions, growth rates in the surface waters are controlled by the supply rate of DSi via upwelling. An example of nutrient... 

Some pests, diseases, and disorders, and the techniques and materials listed here for prevention and control, are given fuller descriptions, and often pictured, in the chapter on Plant Health (pp.82-103) including mineral (nutrient) deficiencies, biological controls, traps and barriers, and "organic" fungicides and pesticides. Chapter 2, The Soil, contains more information on soil nutrient content and soil chemistry and pH pp.30-33). 

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