Flora and fauna

Despite the human presence, the Park area still maintains a good natural level, thanks to the presence of riparian woods, wetlands and springs along the Sile river course.
Of remarkable value are also the great water basins created in the 1950s through the riverbed excavations. It is worth mentioning the two basins called Lago Inferiore (Lower lake) and Lago Superiore (Upper lake) in Quinto di Treviso, and those situated between the municipalities of  Treviso, Silea and Casier. In all these environments, all year round, it is possible to carry out very interesting observations. The best period is represented by the spring and summer months, when vegetation reaches its highest development.
In winter one can observe significant bird species migrating from northern Europe and stopping in these protected areas of the Park.

In spring the Cervara Oasis is covered by a blanket of plants especially consisting of poplars, willows and alders, within which many animal species can be identified.
It is worth mentioning the outstanding presence of the Lataste's frog, endemic species of the Po Valley.
Among birds, the most visible are the European green woodpecker and the Great spotted woodpecker, which nest after having built the typical holes on the trunk of the trees. Countless passerines also pass in this area during migration, such as the common chiffchaff, the wood warbler, the European pied flycatcher, the spotted flycatcher and many others that can be easily observed with binoculars.
The most important contribution to the area's naturalness comes from the colony of herons (grey heron, little egret, black-crowned night heron), which has attracted many interested ornithologists and birdwatchers since the establishment of the Park.
Besides the former species, also the cattle egret has recently joined the colony, and it is gradually spreading in Venetia too.
In spring also some particularly noteworthy undergrowth plants can be observed, such as the fern Thelypteris palustris, typical of the wet undergrowth, which was once found in the plain forests of the Po Valley.

Between spring and summer one has the opportunity to admire the nesting of the coot, of the little grebe, of the common moorhen and of the rare and majestic great crested grebe. They are all nesting species living along the banks and around the river's widest basins. Among the nesting birds, the nesting tufted duck is particularly important since it is a very rare diving duck in Italy. Looking at the river banks, one can also observe gatherings of chubs, tenches and carps as well, engaging in the typical reproduction rituals. All around it grows the Hippuris vulgaris, a plant which was very common along the Sile river, but which is now diminishing maybe as a consequence of the change in the water condition.
Very pleasant and delicate are the flowers of the frogbit (Hydrocharis morsus-ranae), which develops on shallow waters together with the plentiful growth of the Lemna minor.

Between autumn and winter one can observe the bird migration, in particular of the water birds staying in the river's most open and widest areas. During this period there are cormorants, great crested grebes, little grebes and ducks such as the mallard, the common pochard, the tufted duck, the ferruginous duck, the gadwall, the Eurasian teal etc… and a plenty of seagulls, such as the yellow-legged gull and the black-headed gull. There are also the northern seagulls, such as the common gull and, sometimes, even the lesser black-backed gull temporarily stopping in the area. Sometimes the lake shores are covered with a brown-reddish blanket of plants: it is the Azolla filiculoides, a small water fern playing a fundamental role for the water treatment. It is a multitude of animal and plant species enhancing the naturalness and biodiversity level of the Park and allowing us to still enjoy the beauties included along the Sile river course.

(By Prof. Francesco Mezzavilla)
Nymphacea alba
Parnassia palustris
Couple of mallards
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