Zooplankton variability related to environmental changes in a eutrophic coastal lagoon in the Po Delta
✍ Scribed by Sandra Sei; Giampaolo Rossetti; Ferdinando Villa; Ireneo Ferrari
- Publisher
- Springer
- Year
- 1996
- Tongue
- English
- Weight
- 644 KB
- Volume
- 329
- Category
- Article
- ISSN
- 1573-5141
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✦ Synopsis
Zooplankton variability in a lagoon of the Po Delta, the Sacca di Goro, was studied in relation to changes in its hydrodynamic and hydrological features . From 1987 to 1992 the lagoon was affected each summer by severe anoxia due to the decomposition of dense and widespread beds of Ulva rigida . In August 1992 a canal was opened through the sand bank closing off the lagoon from the sea in order to improve the water circulation . This hydraulic intervention led to significant environmental changes in the lagoon : during the two subsequent years the summer dystrophic crises were brief and less severe, due to a sharp decrease in the Ulva cover. At the same time a clear increase in phytoplankton biomass values was observed . Following the opening of the channel, the most remarkable change in zooplankton was a significant density increase of calanoids, particularly of Acartia tonsa .