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Complex hydrological controls on wet dune slacks: the importance of local variability
M L M Jones1, B Reynolds, S A Brittain
1Centre for Ecology and Hydrology Bangor, Orton Building, Deiniol Road, Bangor, Gwynedd LL57 2UP, UK. LJ@ceh.ac.uk
The Science of the Total Environment
|October 28, 2006
Summary
Groundwater chemistry and water levels in UK dune slacks show complex variations. Understanding these hydrological regimes is crucial for managing these valuable, species-rich conservation habitats.
Area of Science:
- Ecological hydrology
- Coastal geomorphology
- Environmental chemistry
Background:
- Dune slacks are vital, species-rich habitats.
- Their ecology is significantly influenced by water chemistry and groundwater fluctuations.
- Effective conservation requires a deep understanding of these hydrological controls.
Purpose of the Study:
- To analyze changes in water chemistry and water table levels in a UK dune system over 12 months.
- To identify distinct groundwater signatures and understand hydrological responses to rainfall.
- To inform conservation management strategies for dune slack habitats.
Main Methods:
- Monitoring water chemistry and water table levels in 8 piezometers and 15 ephemeral surface water locations.
- Analyzing total nitrogen concentrations, including dissolved organic nitrogen and nitrate dominance.
- Utilizing Principal Components Analysis (PCA) for water chemistry signatures.
- Comparing water levels with antecedent rainfall to identify temporal heterogeneity and lags.
Main Results:
- Groundwater nitrogen concentrations ranged from 0.27-8.21 mg N L(-1), with varying dominant forms.
- PCA revealed at least four distinct groundwater chemical signatures.
- Water levels exhibited significant temporal heterogeneity with complex seasonal responses and multiple lags to rainfall.
- Summer rainfall showed lags of 4, 6, and 7 months, plus a rapid 1-day lag response; winter levels indicated exogenous groundwater influence with lags.
Conclusions:
- Local variations in water chemistry and hydrological regimes within dune slacks are more complex than previously understood.
- The identified hydrological complexities have significant implications for the conservation management of these high-priority habitats.
- Further research into these intricate hydrological dynamics is essential for successful dune slack conservation.
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