Hornsea Mere is the largest natural lake in Yorkshire and best known for it’s amazing numbers of Little Gulls in the Autumn. Situated less than 1 km from the sea on the East Yorkshire coast in northern England.
It is of glacial origin, shallow (1-2m deep), eutrophic and fringed with reedbeds, fen and carr. Its shallowness has encouraged the development of extensive marginal swamps of Common Reed, Bulrush and Common Club-rush. These are best developed at the west end of the Mere, where they grade into Alder and Willow. There are also fen communities, rich in plant species, as well as aquatic plants of open water such as Canadian Waterweed, Fennel Pondweed, Spiked Water-milfoil, Rigid Hornwort, Yellow Water-lily and Water Parsnip.
Dense algal blooms occur in summer as a result of eutrophication. The reedbeds, swamp communities and wet woodland support a diverse invertebrate fauna. Hornsea Mere supports breeding and wintering waterbirds, which feed on the open water and use the marginal vegetation for feeding and roosting.