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Mangrove Sedimentation and Response to Relative Sea-Level Rise
C D Woodroffe1, K Rogers1, K L McKee2
1School of Earth and Environmental Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia; email: colin@uow.edu.au , kerrylee@uow.edu.au.
Annual Review of Marine Science
|September 26, 2015
Summary
Mangrove distribution is shaped by water and salinity, influenced by sediment accumulation and sea-level changes. Despite their resilience, human activities threaten these vital coastal ecosystems.
Area of Science:
- Coastal Ecology
- Geomorphology
- Paleoclimatology
Background:
- Mangroves inhabit tropical and subtropical intertidal zones, with distribution influenced by complex hydrodynamic and salinity conditions.
- Sediment dynamics, including accumulation rates and types (allochthonous and autochthonous), vary significantly across different mangrove settings.
- Mangrove sediments store carbon and preserve valuable paleoenvironmental records of sea-level fluctuations.
Purpose of the Study:
- To review and synthesize current understanding of mangrove distribution dynamics over time.
- To explore the interplay between sedimentation, sea-level rise, and mangrove persistence.
- To highlight threats to mangrove ecosystems and their declining extent.
Main Methods:
- Analysis of sediment accumulation rates (inorganic and organic, allochthonous and autochthonous).
- Utilizing radiometric dating for long-term sedimentation analysis.
- Employing surface elevation tables and marker horizons for short-term subsurface process monitoring (root growth, autocompaction).
Main Results:
- Sedimentation patterns range from dynamic mudbanks in terrigenous-rich areas to mangrove peat in carbonate settings.
- Mangrove persistence indicates an adaptive capacity to moderate rates of relative sea-level rise.
- Significant human pressures are causing a continuous decline in global mangrove coverage.
Conclusions:
- Mangrove ecosystems demonstrate complex responses to environmental changes, particularly sea-level rise and sedimentation.
- Understanding past sea-level adjustments through mangrove sediments is crucial for predicting future resilience.
- Urgent conservation efforts are needed to mitigate human impacts and reverse the decline of mangrove habitats.
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