England Non Native Species records 1965 to 2017

Quality Control

Records collected before 1990 are ad hoc and quality is specific to the record. More recent records are checked and surveyors are trained in the identification of non-native species. We are most confident in records from 2009 onwards. Data have been checked for gross spatial errors, but due to the large volume or records, there may be examples of incorrect grid references. Please help us to improve our species records by reporting any errors you find within this dataset to alice.hiley@environment-agency.gov.uk

Method steps

1. Non-native species present in a sample are recorded when they are of the target group, for example Signal Crayfish (Pacifastacus lenisculus) in a benthic invertebrate sample or Canadian pondweed (Elodea canadensis) in a plant survey. Other non-native species are recorded when seen at or around Environment Agency monitoring sites. Very few records are from non-native species specific monitoring.

The records cover England only. There is a bias towards rivers and other sites where the Environment Agency carries out monitoring. The coverage is fairly even. The majority of records have 100m resolution or greater.