The human footprint

 

As the river widens, human presence and activity along its banks intensify. On its shores we find towns and larger cities, industrial areas, and vegetable gardens that take advantage of the most fertile soils formed by alluvial sediments.

The Anoia River has undergone a progressive degradation of water quality and of the associated ecosystems due to intensive water use, both agricultural in its headwaters and industrial downstream. For many years, waste from the production of shoe soles and cloth rags, as well as from tanneries, looms, and the paper and cardboard industries, was dumped into the river.

In recent years, improvements in wastewater management and actions to restore the river ecosystem have allowed significant recovery of the river’s ecological health, enabling today the enjoyment of flora and fauna typical of riparian environments.

Look closely at:

Round-headed bulrush (Scirpoides holoschoenus). Traditionally used in basketry.
Bulrush (Typha sp.). The plant, when dried, is used to make chair seats.
 

Invasive species: a threat to the river

Keeping invasive species in check is one of the most important tasks for preserving the river's health. Plants such as giant reeds or tree of heaven grow very quickly and invade the riverbanks, displacing native vegetation.
Exotic animals, such as the American crayfish or Florida turtles, also create problems. They compete with local species for space and food and can even threaten their survival.
The tree of heaven (Ailanthus altissima) is a highly invasive species. Its bark and leaves contain substances that inhibit the growth of other plants.