In marine and freshwater
ecology, a particle is a small object. Particles can remain in suspension in the ocean or freshwater, however they eventually settle (rate determined by Stokes' law) and accumulate as sediment. Some can enter the atmosphere through wave action where they can act as cloud condensation nuclei(CCN). Many organisms filter particles out of the water with unique filtration mechanisms ( filter feeders). Particles are often associated with high loads of toxins which attach to the surface. As these toxins are passed up the food chain they accumulate in fatty tissue and become increasingly concentrated in predators (see bioaccumulation. Very little is known about the dynamics of particles, especially when they are re-suspended by dredging. They can remain floating in the water and drift over long distances. The decomposition of some particles by bacteria consumes a lot of oxygenand can cause the water to become hypoxic.
Particle levels in water (or air) can be measured with a
turbiditymeter and analyzed with a particle counter. They can also be scanned with an underwater microscope, such as ecoSCOPE. Collected particles of size 20 - 200 micrometershovering in the free water in the vicinity of a harborhad the following contaminantlevels (table). Many of those contaminants are carcinogenic.
ecoSCOPEmicroscope. The blue frame is a 1 mm contrast grid.]
It takes a few days until
planktonorganisms have filtered the particles and incorporated the toxins into their body fat and tissue: In the southwards flow of the waters of the Hudson off the coast of New Jersey, the highest levels of mercury in copepods have not been found directly in front of the river off New Yorkbut 150 km south, off Atlantic City.
Many copepods are then captured by
mysidae, krilland smallest fishlike the juveniles of atlantic herring- and in each step of the foodchainthe toxin concentrations increase by the factor of 10. The milk of mothers ("Homo sapiens") consuming fish and related products like margerine and eggs in such areas have so high toxin levels that it would be impossible to sell such milk on markets - their babies have much more birth-defects and/or retarded brains and have later difficulties to learn and/or reproduce. Many die at an early age.
krill: The first degree filter setaecarry in v-form two rows of second degree setae, pointing towards the inside of the feeding basket. The purple ball is one micrometer in size. To display the total area of this fascinating particle filtration structure one would have to [http://www.ecoscope.com/krill/filter/filter7/index.htm tile] 7500 times this image.
Filter basketof a mysid. These 3 cm long animals live close to shore and hover above the sea floor, constantly collecting particles. Mysids are an important food source for herring, cod, flounder, striped bass. In polluted areas they have high toxin levelsin their tissue but they are very robust and take a lot of poison before they die. Such filter feedingorganisms are the reason that much of the materials we throw in the oceans comes back to us in our food.Fact|date=May 2007
*Hypoxia for articles dealing with hypoxia or anoxia in the environment
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