Seagrass is a general term for the only important ‘higher’ plants found in the sea. Unlike algae (seaweeds) they prefer to colonise sandy bottoms, where they are important for stabilising the sediment, and help provide a habitat for a diverse range of wildlife. Whilst seagrass is an important habitat defining species, is is not nearly as competent underwater as the algae, and, in particular, it appears to suffer greatly in turbid (cloudy) water. As a consequence it does not tollerate any coastal development that kicks up silt or increases pollution.

Anecdotal evidence suggests that seagrass meadows in the UK are recovering since the 1930’s when large areas were wiped out by disease. Globally, however, the situation appears to be less good. Scientists from the University of Maryland have just published a report emphasising the relationship between coastal development and increased population pressure in this region around the worl, and its effect o nthis important habitat.

Further reading:
UK Biodiversity action plan for seagrass beds
Loss of Coastal Seagrass Habitat Accelerating Globally (University Maryland report)

Above right: Zostera sp., photographed in Loch Linnh by the author

Barry