Grup de Recerca de Geobotànica i Cartografia de la Vegetació
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PROJECT: Estudi de la flora i la vegetació dels principals sistemes de molleres i torberes de la Val d'Aran

Conselh Generau d’Aran
Carrillo Ortuño, Amparo (IP). Batriu Vila, Efrem. Ninot Sugrañes, Josep M.. Pérez Haase, Aaron.

Ecological study of fens in the Aran valley (central Pyrenees)

The landscape of the Aran valley includes a good representation of the Pyrenean fen communities, which include a large number of plants particular of Boreo-alpine and Atlantic fens and bogs.

These hygrophytic plant communities lay along complex environmental gradients, which have beed mainly studied in northern Europe. Some of these studies have emphasized the role played by the water mineralization, the flooding regime, and the availability of some nutrients (N, Ph) in the space distribution of the fen species.

Our project in the Aran valley is aimed to study the environmental gradients driving the plant distribution. To this end, we seek at the relationships between fen communities, and physic-chemical variables. The field work is centred into a dozen of fen systems scattered on the Aran landscape. In each system, we take vegetation relevés and perform analyses of the plant communities found.

In each study plot, we record a vegetation relevé and take water and peat samples to perform chemical analyses: water conductivity, pH, and cations (mainly Ca); forms of N in the peat; etc. Moreover, we record the depth of the water table at the end of July, and the development of the histic horizon.
Together with the environmental data, our study gathers a thorough sampling of the flora (vascular plants and bryophytes) and the vegetation units of the main fen systems of the Aran valley.

The data sets yielded are analyzed by means of multivariate statistical tools, to obtain groups (clustering) and ordinations (correspondance analyses, etc.).These methods are useful in the detection of the main variables driving the species composition of the fen communities, and lead to new proposals in their ecological classification.

Research field:
Ecology of plant communities

Project results:

Guardiola, M.; Petit, A.; Carrillo, E.; Pérez-Haase, A.; Batriu, E.; Ninot, J.M. 2013
Aportacions a la flora dels Pirineus centrals (II).
Orsis 27: 261-286.
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Pérez-Haase, A.; Carrillo, E.; Batriu, E.; Ninot, J.M. 2012
Diversitat de comunitats vegetals a les molleres de la Vall d’Aran (Pirineus centrals).
Acta Botanica Barcinonensia 53: 61-112.
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Pérez-Haase, A.; Batriu, E.; Carrillo, E.; Ninot, J.M. 2011
Estudi ecològic de les molleres de la Vall d'Aran.
In: Actes del IX Col·loqui Internacional de Botànica Pirenaico-cantàbrica a Ordino, Andorra: 343-348. Monografies del CENMA (Centre d'Estudis de la Neu i de la Muntanya). Andorra.
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Pérez-Haase, A.; Ninot, J.M. 2008
Caracterització florística i ecològica de les molleres de la Bassa Nera (Aiguamòg).
In: VII Jornades sobre Recerca al Parc Nacional d'Aigüestortes i Estany de Sant Maurici: 193-213.
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Grup de Recerca de Geobotànica i Cartografia de la Vegetació
Universitat de Barcelona. Facultat de Biologia
Avinguda Diagonal, 643. 08028 Barcelona
Tel.:934 021 476 - Fax: 934 112 842