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An Italian environmental group warned on Monday that mass tourism was slowly eroding the Venice lagoon, which it said was also threatened by major real estate development and an inadequate transport network.

Architect Cristiano Gasparetto said a 1988 study indicated that while the acceptable maximum number of tourists for Venice is 33,000 daily, today the average figure is 59,000.

Alessandra Mottola Molfino, head of the Italia Nostra non-governmental organization, said the figure "is too high for such a fragile city".

The group's experts say that as a result of this human tide, aquatic transport has soared in the city, causing the gradual destruction of the lagoon ecosystem, with its mix of sea and fresh water and its relatively shallow bed which is home to plants which can oxygenate water.

Propellers of ships cruising at ever greater speeds push up the underwater silt which is sucked in by tides, with Venice increasingly becoming less of a lagoon and more and more a bay.

The Venice lagoon is an inlet of the Adriatic Sea, with access to sea water largely restricted by a series of sand bars at the lagoon's entrance.

A substantial amount of freshwater used to flow through the lagoon as well, but over the past several centuries most of it has been diverted directly to the Adriatic.

The lagoon's water now possesses a salinity level nearly as high as that of the Adriatic.

Luigi D'Alpaos, a professor of hydrodynamics at Padua University, said that in the space of 70 years, the lagoon bed had dropped on average by a meter.

Italia Nostra proposed a sharp reduction of the number of tour groups, even though it realizes that such a step "would momentarily lead to a drop in trade flows" and the "decline of the local economy".

It suggested developing other activities such as university research or ecotourism to "create a richer economy than one solely based on (mass) tourism".

Italia Nostra also slammed excessive real estate speculation, including plans by Venice authorities to build a nearby city, Tessera, complete with offices, a casino, warehouses and a high-speed rail link.

（中国日报网英语点津 Julie 编辑）

Todd Balazovic is a reporter for the Metro Section of China Daily. Born in Mineapolis Minnesota in the US, he graduated from Central Michigan University and has worked for the China Daily for one year.