J. van Belzen
Utrecht University
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Featured researches published by J. van Belzen.
Ecology | 2012
Ellen J. Weerman; J. van Belzen; Max Rietkerk; Stijn Temmerman; Sonia Kéfi; P.M.J. Herman; van de Johan Koppel
Self-organized spatial patterns have been proposed as possible indicators for regime shifts in ecosystems. Until now, this hypothesis has only been tested in drylands. Here, we focus on intertidal mudflats where regular spatial patterns develop in early spring from the interaction between diatom growth and sedimentation but disappear when benthic herbivore abundance increases in early summer, accompanied by a dramatic shift to a bare mudflat. We followed the patch-size distributions of diatom biofilms during this degradation process. As time progressed, we found a temporal change in the spatial configuration occurring simultaneously with the loss of the diatom-sediment feedback. This indicates a gradual failure in time of the self-organization process that underlies regular patterning in this ecosystem. The path to degradation co-occurred with the loss of the larger patches in the ecosystem, which resulted in a decrease of the truncation in the patch-size distribution. Hence, our study in mudflat ecosystems confirms the general hypothesis that spatial patterns can provide important clues about the level of degradation. Nevertheless, our study highlights the need for thorough study about the type of spatial patterns and the nature of the underlying feedbacks before a reliable assessment of ecosystem status can be made, as changes in patch-size distribution differed markedly with those observed in other ecosystems.
Marine Environmental Research | 2017
V. Lo; Tjeerd J. Bouma; J. van Belzen; C. Van Colen; Laura Airoldi
We investigated how lateral erosion control, measured by novel photogrammetry techniques, is modified by the presence of Spartina spp. vegetation, sediment grain size, and the nutrient status of salt marshes across 230xa0km of the Italian Northern Adriatic coastline. Spartina spp. vegetation reduced erosion across our study sites. The effect was more pronounced in sandy soils, where erosion was reduced by 80% compared to 17% in silty soils. Erosion resistance was also enhanced by Spartina spp. root biomass. In the absence of vegetation, erosion resistance was enhanced by silt content, with mean erosion 72% lower in silty vs. sandy soils. We found no relevant relationships with nutrient status, likely due to overall high nutrient concentrations and low C:N ratios across all sites. Our results contribute to quantifying coastal protection ecosystem services provided by salt marshes in both sandy and silty sediments.
Coastal Engineering | 2014
Louise B. Firth; Richard C. Thompson; Katrin Bohn; Marco Abbiati; Laura Airoldi; Tjeerd J. Bouma; Fabio Bozzeda; Victor Ugo Ceccherelli; Marina Antonia Colangelo; A. Evans; Filippo Ferrario; Mick E. Hanley; Hilmar Hinz; Simon Hoggart; J. E. Jackson; P. Moore; E. H. Morgan; S. Perkol-Finkel; Martin W. Skov; Elisabeth M. A. Strain; J. van Belzen; Stephen J. Hawkins
Coastal Engineering | 2014
T.J. Bouma; J. van Belzen; Thorsten Balke; Zhenchang Zhu; Laura Airoldi; A.J. Blight; Andrew J. Davies; Cristina Galván; Stephen J. Hawkins; Simon Hoggart; Javier L. Lara; Inigo J. Losada; María Isabel Zamanillo Sainz de la Maza; Bárbara Ondiviela; Martin W. Skov; Elisabeth M. A. Strain; Richard C. Thompson; S.L. Yang; Barbara Zanuttigh; Liquan Zhang; P.M.J. Herman
Limnology and Oceanography | 2016
Tjeerd J. Bouma; J. van Belzen; Thorsten Balke; J.H. van Dalen; P.C. Klaassen; A. M. Hartog; David P. Callaghan; Zhan Hu; M.J.F. Stive; Stijn Temmerman; P.M.J. Herman
Proceedings of the 5th Mediterranean Symposium on Marine Vegetation | 2016
Laura Airoldi; Enric Ballesteros; R Buonuomo; J. van Belzen; T.J. Bouma; Emma Cebrian; O De Clerk; Aschwin H. Engelen; Filippo Ferrario; Simonetta Fraschetti; Fabrizio Gianni; Paolo Guidetti; Ljiljana Iveša; Francesco Paolo Mancuso; Fiorenza Micheli; Shimrit Perkol-Finkel; Ester A. Serrão; Elisabeth M. A. Strain; L. Mangialajo
Estuarine Coastal and Shelf Science | 2017
C. Schwarz; T. Cox; T. van Engeland; D. van Oevelen; J. van Belzen; J. Van de Koppel; Karline Soetaert; Tjeerd J. Bouma; Patrick Meire; Stijn Temmerman
Archive | 2017
O. Gourgue; J. van Belzen; C. Schwarz; T.J. Bouma; J. Van de Koppel; Patrick Meire; Stijn Temmerman
VLIZ Special Publication | 2016
C. Schwarz; J. van Belzen; O. Gourgue; T.J. Bouma; J. Van de Koppel; Patrick Meire; Stijn Temmerman
Archive | 2012
J. van Belzen; J. Van de Koppel; P.M.J. Herman; T.J. Bouma