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- W2023651521 abstract "Abstract. The structure of dune ponds hygrophytic vegetation has a spatial organisation in belts around the pond basin, closely related to water level and flooding regime. Doñana National Park has an important representation of temporal dune ponds, which are subjected to rainfall fluctuations and may be suffering the impact of water extraction from the neighbouring tourist resort. Permanent transects in a vegetation complex of five dune ponds have been monitored during a eight year period (1990‐1997). This period was characterised by a number of dry years (annual rainfall around 300 mm), located between two wet cycles (800‐900 mm). Transects were analysed in 1990 (wet period), 1994 (dry) and 1997 (wet) by hierarchical agglomera‐tive clustering. During the dry period hygrophytic species showed regression, with a high mortality of some species like Ulex minor , while the xerophytic species advanced to lower areas. Seedlings of some xerophytic species colonised the dry surface of the pond basin. The lowering of the water table varied in the different ponds, ranging from 312 to 190 cm depending on topography and the distance to the pumping area. The new period of flooding during 1995‐96 and 1996‐97 cycles provided the opportunity for hygrophytic spe cies to re‐establish themselves in their original places. This study suggest that changes in vegetation are caused by the interaction between weather conditions and human disturbance (water extractions). In our example man‐made disturbance is more marked during the dry periods while wet periods tend to obscure the effects of water extractions. From a management perspective, long‐term monitoring of water table and vegetation structure is revealed as a key procedure to the management of land‐water ecotones on pressured areas and threatened habitats." @default.
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- W2023651521 date "1998-02-24" @default.
- W2023651521 modified "2023-09-25" @default.
- W2023651521 title "Vegetation fluctuation in mediterranean dune ponds in relation to rainfall variation and water extraction" @default.
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- W2023651521 doi "https://doi.org/10.2307/1479093" @default.
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