This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Eutrophication Hristova, Aleksandra Kokinov, Radoslav
Apostolov, Lachezar
Eutrophication
Process in which t he concentration of chemical nutrients
increases
T he primary productivity increases
( production of organic compounds from atmospheric carbon
dioxide )
W ater quality are reduced.
Reduce of some a nimal populations .
Increase in other population s that negatively affects other
species .
Bloom of dead phytoplankton and zooplankton in an area. [2],
[1], [5]
Lets Explain
The nitrogen that is exceeded from factories go in the
seas
Cause the rapid growth of algae and cyanobacteria
Algae die
Decomposing bacteria eat the dead algae and multiply
Reduce the oxygen concentration [4]
More about the process
Anthropogenic eutrophication
Effects that are result of human activities.
Anthropogenic eutrophication is a process in which there is
increase of chemical nutrients due to human activities.[2],
[1]
The Process
What causes anthropogenic eutrophication?
Algal Bloom
It limits the sunlight available to the organisms at the
bottom
During the day dissolved oxygen greatly increases and decrease
during night caused by the respiring algae.
The reduced oxygen cause the fish and other marine animals to
suffocate and die
Some bacteria may produce toxins that are deadly for the other
animals
These zones are called dead zones.
Some pictures of algal bloom [1]
Algal Bloom
Effects on the Ecosystem
Decrease of Biodiversity
mainly in the water
Species like fish, etc. die off
due to the lack of oxygen
in the water caused by
algal blooms and increase
in bacteria consuming the O 2
Further Effects on Species
New species which
have different living
requirements may
invade the environment
Algal blooms increase
toxicity which may kill
many plants and animals
(Some pictures that show the effect) [4]
Effects on People
The toxicity increases after the algal blooms and moves up the
food chain affecting people and other living creatures
Dying of species affect peoples gathering businesses such as
fishing, gathering water plants, etc.
Dying off of species such as fish and plants may cause economic
problems due to the decreased trade of these products
(Some pictures that show the effect) [4]
Prevention
Riparian buffer zones
In order to avoid eutrophication, the pollution should be
intercepted before it reaches water sources.
Riparian buffer zones they are built between the pollution
source and the water source, and they are basically interfaces
where nutrients are deposited in order not to be deposited in
water. [3]
Prevention Policy
Riparian buffer zones not effective enough => a law that
should regulate the agricultural use of fertilizer and animal waste
should be imposed. It should at least make the farmers clean up the
waste of their animals, which if it is left alone, will get in the
ground water.
These policies could be divided into four sectors [3]
Sectors
Technologies aim to make people use more common technologies in
agriculture, rather than applying new ones.
Public participation aim to make people aware that they also
participate in this problem.
Economic Instruments aim to give incentives for those who
protect the water sources from pollution by using clean methods for
agriculture.
Cooperation Pollution may be because of, or affect several
communities => they should cooperate in order to deal with the
problem. [3]
Nitrogen testing and modeling
Farmers use technique called Soil Nitrogen testing in order to
optimize the amount of fertilizer applied to crops.
It reduces both the wastes and the expenditures. [3]
Measures to deal with the existing problem
Cleanups
The most common way to deal with the problem.
Similar to the cleaning of the school yards, but aim to remove
mostly organic pollution.
Began in the 1970s in Finland, where a group of activists
cleaned up several lakes and rivers from pollution that came from
industrial, municipal, and agricultural sources.
May have a 90% removal efficiency
However, in some places despite the reduction due to cleanup,
the pollution stayed the same => sometimes these efforts are not
effective. [3]