Invertebrates
Sweep netting is a frequently used technique for surveying terrestrial invertebrates
The majority of UK invertebrates are not protected by law, however surveys are periodically requested by the statutory conservation agencies as part of impact assessments - especially where the aquatic environment may be affected.
Survey techniques depend on the nature of the site and the species or group under study - a thorough survey can involve a combination of different techniques on several occasions during spring, summer and autumn.
Our specialist in-house surveyors are able to undertake surveys of terrestrial and aquatic habitats and are familiar with a wide range of techniques and monitoring methods, including BMWP (Biological Monitoring Working Party) scoring and PSYM (Predictive System for Multimetrics) - both are frequently used in water quality monitoring.
White clawed crayfish
White-clawed Crayfish have undergone catastrophic decline since the 1970's as a result of disease and competition from introduced species. Our licenced specialists undertake survey, design mitigation strategies and oversee site works and habitat creation.
Developments with potential to affect watercourses that could support white-clawed crayfish are likely to require survey beforehand. Any development affecting crayfish habitat is likely to require a licence from Natural England.
Field work is seasonally constrained and can only be carried out by a licenced surveyor from mid-July to the end of September. Such a tight seasonal restriction means that this species should be considered at the initial stages of a project.
Mitigation depends on the nature and likely severity of the impact. Options range from avoidance (e.g. taking measures to avoid pollution or sedimentation during in-stream works) to trapping and removal of animals prior to works commencing.