UK coastal species such as puffins and little terns could be “seriously affected” by erosion and climate change, the National Trust has said.
It has published a list of six species in a bid to highlight how wildlife might fare over the next few decades.
While triggerfish numbers are rising, species such as puffins are at risk due to factors like unpredictable weather.
The trust said climate change was set to cause more of a “bust than boom”.
According to the organisation, the UK coastline is already being affected by rising sea levels, with projections suggesting seas could be half a metre higher than at present by 2100.
Matthew Oates, wildlife specialist for the National Trust, said: “Climate change could change the face of our coastal flora and fauna. With rising sea levels, our rich mud flats could simply disappear.