Study

Recovery assessment in Lake Nemi (Italy) after a twenty year period (1981–2001) using plant-associated invertebrates

  • Published source details Mastrantuono L. & Sforza M. (2008) Recovery assessment in Lake Nemi (Italy) after a twenty year period (1981–2001) using plant-associated invertebrates. Aquatic Ecosystem Health & Management , 11, 310-320.

Summary

Action: Divert/block/stop polluted water inputs

A before-and-after study in 1981–2002 of a freshwater lake near Rome, Italy (Mastrantuono & Sforza 2008) reported that after diverting polluted water inputs away from the lake, the richness and extent of submerged vegetation increased. In 1981–1982, the lake received waste water from surrounding villages and a nursing home and was enriched in nutrients. There were five submerged macrophyte taxa present, at a maximum depth of 3 m. In 2001–2002, approximately 12 years after diversion of polluted water inputs, the lake contained nine submerged macrophyte taxa at a maximum depth of 8 m. The dominant species in both periods were Eurasian watermilfoil Myriophyllum spicatum and coontail Ceratophllum demersum (data reported as abundance classes). Stoneworts (Charales) were present only in 2001–2002. Methods: Submerged macrophytes were surveyed with a sledge dredge, at the same five sites around Lake Nemi before and after diverting waste water. The waste diversion programme began at some point in the 1980s and was completed in 1990 (further details not reported).

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