Abstract
We studied mechanisms of vegetation change in fens subject to succession from open water to floating mats and finally herbaceous rich-fens. Earlier research showed that these systems are characterized by transient seed banks. Our main question was whether seedlings of later successional fen stages are already present in earlier stages, remaining subordinate in the vegetation until conditions become suitable for them. If, however, conditions during succession change in a way that only a limited set of species can survive as seedlings during each of the successional stages, no seedling bank will exist. The transient character of the seeds would then imply that seeds will not germinate and will subsequently die and that seeds that have germinated in the “wrong” stage will not become established. We hypothesized that: (1) germination and seedling survival of fen species are significantly better in the successional fen stage for which these species are characteristic, (2) as a consequence no seedling banks occur in these fens. In a field experiment, seeds of five characteristic fen species in the standing vegetation of three successional fen stages i.e. raft fen, quaking fen and rich fen were sown in each of these stages in a turf pond in the Tienhoven area, The Netherlands. Germination and seedling survival were measured over two growing seasons together with environmental variables. Germination was higher in the “own” stage for all species groups as was survival for quaking fen species and rich fen species. For both these stages, percentage of germination and survival of four out of five characteristic species were significantly higher in the “own” stage. Germination and survival can be considered stage-dependent and it was concluded that seedling banks do not exist in these fens. Site-specific environmental variables act as a sieve and differentiate on species presence already during early life history stages. We found clues that the environmental sieve acts at the level of nutrient availability, tolerance for high sulphide concentration and light climate. Because of the transient seed bank and absence of a seedling bank in these fen wetlands, successful establishment of species necessitates a continuous dispersal of characteristic species until the environmental conditions permit establishment. This also implies that species of the whole successional sere should be present within dispersal distance.
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References
Al-Mufti M., Furness C., Grime J.P., Band S. (1977). A quantitative analysis of shoot phenology and dominance in herbacious vegetation. J. Ecol. 65:759–792
Bakker J.P. (1989). Nature Management by Grazing and Cutting. Geobotany 14. Kluwer, Dordrecht, The Netherlands
Bakker S.A., Van den Berg N.J., Speleers B.P. (1994). Vegetation transitions of floating wetlands in a complex of turbaries between 1937 and 1989 as determined from aerial photographs with GIS. Vegetatio 114:161–167
Bakker J.P., Poschlod P., Strykstra R.J., Bekker R.M., Thompson K. (1996). Seed banks and seed dispersal: important topics in restoration ecology. Acta Bot. Neerland. 45:461–490
Bekker R.M., Schaminée J.H.J., Bakker J.P., Thompson K. (1998). Seed bank characteristics of Dutch plant communities. Acta Bot. Neerland. 47:15–26
Corona Perez E., Van der Klundert I., Verhoeven J.T.A. (1996). Availability of organic and inorganic phosphorus compounds as phosphorus sources for Carex species. New Phytol. 133:225–231
Den Held A.J., Schmitz M. and Van Wirdum, G. 1992. Types of terrestrializing fen vegetation in the Netherlands. In:Verhoeven, J.T.A. (eds), Fens and Bogs in the Netherlands: Vegetation, History, Nutrient dynamics and Conservation, pp. 237–321
Fenner M. (1985). Seed Ecology. Chapman & Hall, New York
Gray J.S. (1987). Species-abundance patterns. In: Gee J.H.R., Giller P.S. (eds). Organization of Communities, Past and Present. Blackwell Science, Oxford
Green E.K., Galatowitsch S.M. (2002). Effects of Phalaris arundinacea and nitrate-N addition on the establishment of wetland plant communities. J. Appl. Ecol. 39:134–144
Grubb P.J. (1977). The maintenance of species richness in plant communities: the importance of the regeneration niche. Biol. Rev. 52:107–145
Hodgson J.G., Grime J.P. (1990). The role of dispersal mechanisms, regenerative strategies and seed banks in the vegetation dynamics of the British landscape. In: Brunce R.G.H., Howard D.C. (eds). Species Dispersal in Agricultural Habitats. Belhaven, London, pp. 65–81
Houba V.J.G., Van Schouwenburg J.Ch., Walinga L., Novozamsky I. (1979). Soil analysis II. Methods of analysis for soils. Agricultural University, Wageningen, the Netherlands
Hutchings M.J., Russell P.J. (1989). The seed regeneration dynamics of an emergent salt marsh. Ecology 77:615–637
Keddy P.A., Reznicek A.A. (1982). The role of seed banks in the persistence of Ontario coastal plain flora. Am. J. Bot. 69:3–22
Lamers L. 2001. Biogeochemistry in fen ecosystems. Thesis, University of Nijmegen, The Netherlands
Middleton B., (2003). Soil seed banks and the potential restoration of forested wetlands after farming. J. Appl. Ecol. 40:1025–1034
Moore H.H., Niering W.A., Marsicano L.J., Dowdell M. (1999). Vegetation change in created emergent wetlands (1988–1996) in Connecticut (USA). Wetl. Ecol. Manage. 7:177–191
Nash Suding K., Goldberg D.E. (1999). Variation in the effect of vegetation and litter on recruitment across productivity gradients. J. Ecol. 87:436–449
Niering W.A. (1987). Vegetation dynamics (succession and climax) in relation to plant community management. Conserv. Biol. 1:287–295
Pachmayr F. 1960. Vorkommen und Bestimmung von Schwefelverbindungen in Mineralwasser. Thesis, München
Parker V.T., Leck M.A. (1985). Relationships of seed banks to plant distribution patterns in a freshwater tidal wetland. Am. J. Bot. 72:161–174
Pickett S.T.A. (1989). Space-for-time substitution as an alternative to long-term studies. In: Likens G.E., (eds). Long-term Studies in Ecology: Approaches and Alternatives. Springer-Verlag, New York, pp. 110–135
Pons L.J., (1992). Holocene peat formation in the lower part of The Netherlands. In: Verhoeven J.T.A. (eds). Fens and Bogs in The Netherlands: Vegetation, History, Nutrient Dynamics, Conservation. Kluwer Academic Publishers, Dordrecht, pp. 7–79
Schaminée J.H.J., Weeda E.J. and Westhoff V. 1995. De vegetatie van Nederland. Deel 2, Plantengemeenschappen van wateren, moerassen en natte heiden. Opulus Press, Uppsala. Vegetation of The Netherlands. Part 2, Plant communities of shallow waters, marshes and fens and wet heahtland
Schneider R. (1994). The role of hydrologic regime in maintaining rare plant communities of New York’s coastal plain pond-shores. Biol. Conserv. 68:253–260
Seabloom E.W., Van der valk A.G., Moloney K.A. (1998). The role of water depth and soil temperature in determining initial composition of prairie wetland coenoclines. Plant Ecol. 138:203–216
Stockey A., Hunt R. (1994). Predicting secondary succession in wetland mesocosms on the basis of autecological information on seeds and seedlings. J. Appl. Ecol. 31:543–559
Ter Braak C.J.F. (1987). The analysis of vegetation–environmental relationships by canonical correspondence analysis. Vegetatio 69:69–77
Ter Heerdt G.N.J., Verweij G.L., Bekker R.M., Bakker J.P. (1996). An improved method for seed bank analysis: seedling emergence after removing the soil by sieving. Funct. Ecol. 10:144–151
Soil Seed Banks of North-West Europe: Methodology, Density and Longevity: Methodology, density and longevity. Cambridge University Press, Cambridge
Tilman D. (1982). Resource Competition and Community Structure. Princeton University Press, Princeton
Tilman D. (1993). Species richness of experimental productivity gradients: how important is colonization limitation?. Ecology 74:2179–2191
Van Andel J., Bakker J.P., Grootjans A.P. (1993). Mechanisms of vegetation succession: a review of concepts and perspectives. Acta Bot. Neerland. 42:413–433
Van den Broek T., Van Diggelen R., Bobbink R., (2005). Variation in seed buoyancy of species in wetland ecosystems with different flooding dynamics. J. Vegetat. Sci. 16:579–586
Van den Broek T., Verhoeven, J.T.A. and Antheunisse, M.A. (unpubl.). Sulphate tolerance and performance of five Carex species from different successional fen stages
Van der Meijden, R. 1996. Heukels’ flora van Nederland. Wolters-Noordhoff, Groningen. Heukels’ flora of The Netherlands
Van der Valk A.G., (1981). Succession in wetlands: a Gleasonian approach. Ecology 62:688–696
Van der Valk A.G., Davis C.B. (1978). The role of seed banks in the vegetation dynamics of prairie glacial marshes. Ecology 59:322–335
Van der Valk A.G., Verhoeven J.T.A. (1988). Potential role of seed banks and understory species in restoring quaking fens from floating forest. Vegetatio 76:3–13
Van Diggelen R., Molenaar W.J., Kooijman A.M. (1996). Vegetation succession in a floating mire in relation to management and hydrology. J. Vegetat. Sci. 7:809–820
Verhoeven J.T.A., Bobbink B., (2001). Plant diversity of fen landscapes in the Netherlands. In: Gopal B., Junk W.J., Davis J.A. (eds). Biodiversity in Wetlands: Assessment, Function and Conservation, volume 2. Backhuys Publishers, Leiden, the Netherlands, pp. 65–87
Wassen M.J., Joosten J.H.J. (1996). In search of a hydrological explanation for vegetation changes along a fen gradient in the Biebrza Upper Bain (Poland). Vegetatio 124:191–209
Wassen M.J., Van Diggelen R., Wolejko L., Verhoeven J.T.A. (1996). A comparison of fens in natural and artificial landscapes. Vegetatio 126:5–26
Wheeler B.D. (1980a). Syntaxa of rich-fen systems in England and Wales. I: Introduction. Tall sedge and reed communities. J. Ecol. 68:365–395
Wheeler B.D. (1980b). Syntaxa of rich-fen systems in England and Wales II: Communities of calcareous mires. J. Ecol. 68:405–420
Wheeler B.D. (1980c). Syntaxa of rich-fen systems in England and Wales. III: Fen meadow, fen grassland and fen woodland communities and contact communities. J. Ecol. 68:761–788
Acknowledgements
The authors thank N. van Rhee and E. Ketelaar who assisted collecting the field data and carried out a great part of the analysis. We are grateful to Prof Dr J.T.A. Verhoeven and the anonymous referees for very helpful comments and suggestions on earlier versions of this paper.
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Van den Broek, T., Beltman, B. Germination and seedling survival in fens undergoing succession. Plant Ecol 185, 221–237 (2006). https://doi.org/10.1007/s11258-006-9100-0
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DOI: https://doi.org/10.1007/s11258-006-9100-0