Biomass production in pioneer Spartina anglica patches : Evidence for the importance of seston particle deposition

Salt marsh formation can be initiated by the colonization of bare tidal flats by pioneer halophytes such as Spartina anglica. In the present study, growth of S. anglica in the edge and centre zones of pioneer patches colonizing a tidal flat in a marine bay in the south-west Netherlands was investiga...

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Veröffentlicht in:Estuarine, coastal and shelf science coastal and shelf science, 1998-12, Vol.47 (6), p.797-805
Hauptverfasser: HEMMINGA, M. A, VAN SOELEN, J, MAAS, Y. E. M
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creator HEMMINGA, M. A
VAN SOELEN, J
MAAS, Y. E. M
description Salt marsh formation can be initiated by the colonization of bare tidal flats by pioneer halophytes such as Spartina anglica. In the present study, growth of S. anglica in the edge and centre zones of pioneer patches colonizing a tidal flat in a marine bay in the south-west Netherlands was investigated. Average biomass and shoot length was significantly lower in centre zones than in edge zones of the patches. Multiple linear regression showed that 84% of the variance in aboveground biomass in the centre zones could be explained by sediment phosphorus and nitrogen concentrations. No such relationship existed in the edge zone. This suggests that biomass production in the centre zones of the patches is nutrient limited, but that factors other than sediment nitrogen and phosphorus content determine growth of Spartina in the edge zones. The sediment nitrogen and phosphorus concentrations in the centre zones of the patches were significantly related with sediment carbon concentrations, indicating that the pool of particle-bound nutrients in the sediment to an important extent is associated with organic particles. Determination of stable carbon isotope signatures of the sedimentary organic matter showed that an increasing carbon content of the sediment in the centre zone of the patches (and a rise in plant biomass) coincides with a higher contribution of non-Spartina derived carbon to the sedimentary organic matter pool. Sustained biomass production in the centre zones of the patches, thus, probably depends on deposition of allochthonous organic particles and the nutrient inputs inherent in this process. Due to the construction of large-scale hydro-engineering works, however, conditions for deposition of waterborne particles are currently unfavourable. The consequences of reduced carbon and nutrient inputs into the patches will be particularly in the (older) centre zones, where the nutrient pools in non-refractory organic matter have been drained in the years of previous growth. Accordingly, it is hypothesized that the canopy-enhanced sedimentation for which Spartina is well-known, via positive feed-back effects on plant growth can be crucial for plant vitality, and, hence, for successful colonization of unvegetated areas.
doi_str_mv 10.1006/ecss.1998.0388
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The sediment nitrogen and phosphorus concentrations in the centre zones of the patches were significantly related with sediment carbon concentrations, indicating that the pool of particle-bound nutrients in the sediment to an important extent is associated with organic particles. Determination of stable carbon isotope signatures of the sedimentary organic matter showed that an increasing carbon content of the sediment in the centre zone of the patches (and a rise in plant biomass) coincides with a higher contribution of non-Spartina derived carbon to the sedimentary organic matter pool. Sustained biomass production in the centre zones of the patches, thus, probably depends on deposition of allochthonous organic particles and the nutrient inputs inherent in this process. Due to the construction of large-scale hydro-engineering works, however, conditions for deposition of waterborne particles are currently unfavourable. 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This suggests that biomass production in the centre zones of the patches is nutrient limited, but that factors other than sediment nitrogen and phosphorus content determine growth of Spartina in the edge zones. The sediment nitrogen and phosphorus concentrations in the centre zones of the patches were significantly related with sediment carbon concentrations, indicating that the pool of particle-bound nutrients in the sediment to an important extent is associated with organic particles. Determination of stable carbon isotope signatures of the sedimentary organic matter showed that an increasing carbon content of the sediment in the centre zone of the patches (and a rise in plant biomass) coincides with a higher contribution of non-Spartina derived carbon to the sedimentary organic matter pool. Sustained biomass production in the centre zones of the patches, thus, probably depends on deposition of allochthonous organic particles and the nutrient inputs inherent in this process. 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subjects Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Brackish water ecosystems
Fundamental and applied biological sciences. Psychology
Spartina anglica
Synecology
title Biomass production in pioneer Spartina anglica patches : Evidence for the importance of seston particle deposition
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