EutrophicRich in plant nutrients, usually referring to fresh water. Eutrophication can occur naturally or can be caused by residues of fertilisers draining into the water from farmland. The opposite term, referring to nutrient-poor waters, is 'oligotrophic'. Eutrophic conditions are much more favourable for birds than oligotrophic.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver