Term name Description

A term used to describe surviving remnants of natural phenomena. It often refers to ancient species which have survived while others become extinct.

Radiation dating techniquesScientific methods of dating materials, e.g. rocks, by examining the comparative decay times of radioactive isotopes of elements. Early techniques were based on rubidium and strontium; more recent techniques utilise lead and uranium
RaptorsA collectively term for birds of prey, including owls
Red Data bookThe official lists of UK species (plants, mammals, birds etc.) of highest conservation value/concern
RegenerationThe continuation/replacement of a woodland by self–seeding – through seed from existing, or felled/burnt trees in the same area. Does not involve planting
ReintroductionThe re–establishment of a species to a country after it has become extinct: a controversial practice that not everyone believes is ecologically justifiable or achievable
Responsible accessA term currently used within the access debate, referring to access, by individuals or groups, undertaken voluntarily in a responsible manner, and thereby acceptable to landowners/managers
River captureThe process by which the headwaters of a drainage system become redirected into another drainage system as a consequence of the breaching of a watershed
River terracesFlat, terrace–like landforms along rivers remnants of past floodplains, at times of higher sea levels
Runoff regime

Runoff is a term used to describe the water, from rain, snowmelt or irrigation,  that flows over the land surface and is not absorbed into the ground, instead flowing into streams or other surface waters or land depressions.