| http://www.w3.org/ns/prov#value | - This results from a variety of factors, such as the development of new and increasingly accurate techniques (e.g. measurement of inorganic and organic nutrients) and the use of different equipment (e.g. replacement of stramin mesozooplankton nets with terylene ones; the replacement of vessels incurring changes in towspeeds and, in some cases, reductions in net size).
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