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Seedling establishment in a dynamic sedimentary environment: a conceptual framework using mangroves.
Thorsten Balke1, Edward L Webb, Eva van den Elzen
1Marine and Coastal Systems, Deltares 2629 HD, Delft, The Netherlands ; Singapore-Delft Water Alliance, National University of Singapore Singapore, 117576, Singapore.
The Journal of Applied Ecology
|July 30, 2013
Summary
Sediment disturbance, like erosion or burial, significantly impacts seedling survival in vegetated ecosystems. Faster-growing plants and adaptive root growth enhance resilience, crucial for successful ecosystem restoration.
Area of Science:
- Ecology
- Geomorphology
- Restoration Ecology
Background:
- Vegetated biogeomorphic systems are vital for sediment transport and landscape self-organization.
- Physical disturbance mechanisms limiting primary colonization in active sedimentary environments are poorly understood.
Purpose of the Study:
- To investigate the impact of sediment disturbance on pioneer vegetation seedlings.
- To elucidate the role of accretion and erosion in seedling survival and morphological adaptation.
Main Methods:
- Mesocosm experiments simulating accretion/burial and erosion/excavation of mangrove seedlings.
- Inclusion of water movement and inundation stress as additional factors.
- Assessment of seedling survival, growth, and biomass allocation.
Main Results:
- Cumulative sediment disturbance reduced seedling survival, with faster-growing species exhibiting higher survival rates.
- Non-lethal accretion increased shoot biomass, while non-lethal erosion promoted root biomass allocation.
- Morphological plasticity and disturbance history influenced seedling resilience to erosion.
Conclusions:
- Seedling survival in dynamic environments depends on the frequency and magnitude of sediment disturbance events.
- Sediment dynamics are a key bottleneck for primary colonization in restoration projects.
- Selecting fast-growing species and managing sediment dynamics are crucial for successful restoration of vegetated biogeomorphic ecosystems.
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