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The significance of spatial and temporal patterns of algal mat deposition in structuring salt-marsh vegetation
van Hulzen, J.B.; van Soelen, J.; Herman, P.M.J.; Bouma, T.J. (2006). The significance of spatial and temporal patterns of algal mat deposition in structuring salt-marsh vegetation. J. Veg. Sci. 17(3): 291-298
In: Journal of vegetation science. Opulus. ISSN 1100-9233; e-ISSN 1654-1103
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| Auteurs | | Top |
- van Hulzen, J.B.
- van Soelen, J.
- Herman, P.M.J.
- Bouma, T.J.
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| Abstract |
Question: Are there hot spots of algal mat deposition in space and time at the marsh scale and, if so, how does this affect the coexistence of a dominant (Spartina anglica) and gap dependent (Salicornia europaea) species? Location: The Rattekaai salt marsh in the Scheldt estuary in the southwestern Netherlands (NW Europe). Methods: Mat cover and the abundance of the gap dependent species Salicornia europaea were monitored at the scale of a marsh. The effects of mat cover on the vegetation structure were studied by applying three mat removal treatments over three growing seasons. Results: The low marsh border was found to be a hot spot of algal mat deposition during the growing season, which had a correlated spatial pattern between two successive years at a 20 m × 20 m scale. The combination of duration, timing and repetition of mat cover determined growth inhibition of the competitive dominant Spartina anglica, and thereby the abundance of subordinates such as Salicornia europaea. Mat cover reduced the storage of carbon reserves in Spartina and our results imply that re Conclusions: In addition to disturbance level, the spatial and temporal distribution of disturbance are important in creating and maintaining habitat for gap dependent species. Relatively small disturbances will have a large effect on diversity if the spatial and temporal distribution of the disturbances leads to ‘disturbance hot spots’. |
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