Scale and DPSIR

 Scale of water body and model 

Zone A scale -  local to a point source discharge

 

Zone B scale - the scale of a water body in which water residence time is a few days, receiving one or more point source or diffuse inputs of waste

 

Zone C scale - the region, in which water residence times are measured in months and where the relevant maricultural concerns include the overall size of the industry

 

Ib - Individual Based model, such as one that deals with growth

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DPSIR - Driving Pressure State Impact Response

 

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The DPSIR framework  allows the classification of indicators according to their use:

 

Driving forces,

the environmental Pressure,

the State of the environment,

the Impact on the environment,

and the Response from the environment.

According to this perspective, the wastes and by-products of fin-fish farming, or the depletion of phytoplankton by shellfish farms, constitute an (ecological) pressure on ecosystems, which may change in state as a result. Some of these changes are the environmental impact of mariculture, which should be managed so as to keep these impacts with acceptable limits. 

 

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