ARTICLE / Recovery of small wetlands on the banks of Ter river as a habitat for amphibians and reptiles

22/11/2016

The temporary ponds are semiaquatic habitats characterized by alternating dry and wet phases, for its unique flora and fauna and a high fragility.

The disappearance of this type of fresh water habitat and the gradual consolidation of the river into a increasingly narrow and single channel or river arm, has been identified as the main cause of decline and fragmentation of populations of herpetofauna in Lower Ter River in recent decades.

The conservation and recovery of these large-scale habitats is essential not only for the conservation of amphibians and aquatic organisms but also to improve climate change and to maintain a connected landscape.

The LIFE Potamo Fauna has restored the Lower Ter to constitute a suitable habitat for amphibians and freshwater turtles, such as small lagoons, ponds and marshes. On one hand the works has been on the recovery of the habitat "Mediterranean temporary ponds" (3170 * -Annex I of the Habitats Directive) in the scope of the Natura 2000 network of Lower Ter, namely Special Areas Conservation "Banks of the Lower Ter (ES5120011)" and the mouth of the "river Llémena" (ES5120020). And secondly it enhances the direct recovery of populations of European Pond Turtle, Emys orbicularis and improvement of the populations of other species of European interest such as the turtle Mauremys leprosa; the newt, Triturus marmoratus; and several toads and frogs (Alytes obstetricans, Pelobates cultripes, Epidalea calamita, Hyla meridionalis).

The results to date are:

- Creation of small marshes in four different places (Anglès, Bescanó, Sant Gregori and Flaçà) with a total of 24 new ponds (≤50m2 and ≤1 meter deep) and a total accumulated between 600 and 1200 m2, thereby increasing the surface of this priority habitat in the Lower Ter.

- Recovery of amphibian populations, giving them new water points in order to colonize these environments naturally and new points of reproduction of these species. There has been a rapid colonization of ponds and breeding of amphibians created in 78.57% of the ponds with water. Detected a total of six species: Painted Frog, Midwife Toad, Salamander, Mediterranean Tree Frog, Green Frog and Toad.

- Release of a total of 125 specimens of European Pond Turtles bred in captivity environments adjacent to the new ponds created. The year 2017 is expected to release up at least 25 more.

In the long term, the aim is to ensure the viability of these species in the Lower Ter river, whether or not established permanently in atmospheres created. The project also carries out actions such as amphibian and aquatic turtle monitoring, both populations native and exotic, and also vegetation and limnological monitoring of the new ponds created.

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