4.7 Article

Unravelling the Spatial and Temporal Plasticity of Eelgrass Meadows

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FRONTIERS IN PLANT SCIENCE
卷 12, 期 -, 页码 -

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FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2021.664523

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Zostera marina; plasticity; bioindicator; water quality; nutrient; resilience

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Seagrasses show strong phenotypic plasticity, enabling them to adapt to environmental changes and recover from disturbances. The study reveals that some seagrass meadows have been severely impacted, possibly due to long-term nutrient loading and wasting disease.
The phenotypic plasticity of seagrasses enables them to adapt to changes in environmental conditions and withstand or recover from disturbance. This plasticity was demonstrated in the large variation recorded throughout a suite of bioindicators measured within Zostera marina meadows around Wales and SW England, United Kingdom. Short-term spatial data were analysed alongside long-term monitoring data to determine which bioindicators best described the status of eelgrass meadows subjected to a range of environmental and anthropogenic drivers. Shoot density, leaf length, leaf nutrients (C:N ratio, %N, %P) including stable isotope of delta C-13 and delta N-15 provided insight into the longer-term status of the meadows studied and a good indication of the causes of long-term decline. Meadows ranged from those in the Isles of Scilly with little evidence of impact to those in Littlewick in Milford Haven, Wales that showed the highest levels of impacts of all sites. Bioindicators at Littlewick showed clear warning signs of nutrient loading reflected in the long-term decline in shoot density, and prevalence of wasting disease. This study highlights the need for continuous consistent monitoring and the benefits of using extra tools in the form of shoot nutrient analysis to determine causes of decline.

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