The habitats in this section are generally considered to be ‘semi-natural’ in that they are historically recognised as having been a part of the UK landscape for hundreds, if not thousands, of years. They also tend to be dominated by species considered native to the UK. However, they invariably have a history of cultural management and, with the possible exception of some cliff ledges, been impacted indirectly by the actions of humans, i.e. through acid rain and atmospheric nitrogen depositions. The biodiversity associated with these habitats can be strongly linked to how they are managed, and removing that management will often result in significant declines in biodiversity. As such, management changes should be considered carefully and strategically.