Cheshire Wildlife Trust is inviting local photographers to take part in its My Wild Mersey competition.

The competition aims to raise awareness of the importance of the Mersey Estuary as the perfect muddy habitat for invertebrates and, in turn, the rich and diverse birdlife that feeds off them.

The sludge tanks of Frodsham Marsh are just one of the Mersey locations where thousands of waders, ducks and birds of prey – common and rare alike – come to refuel throughout the year.

As such, it is a popular spot for local photographers and artists, who often record their spectacular sightings in local birder Bill Morton's Frodsham Bird Blog.

Now, plans are being put forward for a barrage or alternative structure on the Mersey, which would be used to create green energy.

This would affect the tides flowing in and out of the Estuary, which would impact on the habitat and reduce the number and variety of birds who come to the area to feed.

"We desperately need green energy, but any development must be built with as little effect on this vital wildlife refuge as possible," said the Wildlife Trust.

"Where there is an effect, the development must offer compensation and a 'net gain', meaning that wildlife in the area must actually benefit and wild places be much better off than those destroyed.

"Unfortunately not everyone realises just how important this muddy wonderland really is, so we need you to help us spread the word.

"Have you been left breathless by a dunlin mumuration? Has the tranquil atmosphere of the Estuary offered peace in troubling times?

"Enter our My Wild Mersey photo competition and tell us your stories about the wild inhabitants of the Mersey Estuary through words and pictures."

The winner of the competition – judged by an independent panel – will receive a £100 cash prize.

For further details on how to enter, visit the Wildlife Trust website. All entries must be in by 11:59pm on 31 May.