Other Surveys

Terrestrial Invertebrates

enims are able to source national specialists to undertake surveys of any notable habitat or protected species.

These include: 

  • Habitat assessment for Invertebrates

  • Invertebrate surveys

  • Butterfly transect surveys

  • Mitigation strategys

  • Management plans

  • Watching Briefs


Invertebrates are often overlooked by developers as their presence may not be as obvious, however they are critical to Britain’s biodiversity, among the first steps in the food chain of ecosystems, and many species are classed as UK Biodiversity Action Plan (UK BAP) priority species and therefore of principal importance under the NERC Act. This places a duty on planning authorities to have a material consideration for those species when determining planning permission.

enims' ecologists are able to respond pragmatically to recognise habitats where invertebrate populations are large or where rare species are likely to be found. Specialist surveyors can advise on the requirements for invertebrate surveys, identification, mitigation and habitat creation.

enims habitat enhancements will include strategies to produce biodiversity net gain for invertebrates, such as bespoke designs for stag beetle loggeries or nectar-rich planting plans for pollinators.


White-Clawed Crayfish

The white-clawed crayfish is protected under Schedule 5 of the Wildlife and Countryside Act 1981 (as amended) making it illegal to harm, disturb and take (including to handle), this species without an appropriate licence, or to buy or sell white-clawed crayfish whether alive or dead.

White-clawed crayfish live in rivers, streams, canals and quarry pools. Development or repair works may cause damage to populations, and so may require survey under licence.

Survey for white-clawed crayfish should be undertaken if distribution and historical records suggest they may be present. Methods undertaken include manual searching, hand netting, night searches by torch and trapping.

Surveys should be undertaken early in the project timescale to allow suitable mitigation, changes to the project scheme, translocation or compensation of habitat to be designed to maintain legal compliance.


Botanical Surveys

Whilst a Phase 1 survey will map habitats on a site, list plant species and show ‘target notes’ of important areas within the site, it is not a specific botanical survey. Phase 2 surveys are undertaken using National Vegetation Classification (NVC) developed by JNCC to identify and map vegetation using defined plant community types. This survey can be undertaken on larger projects or where full Environmental Impact Assessments (EIAs) are required or where developments impact important, diverse or complex habitats.

Survey for protected plants should be undertaken if distribution, habitat assessments and historical records suggest they may be present.

enims' ecologists are able to assess the requirements for Phase 2 surveys or if surveys for protected plant species should be undertaken. Our botanical experts have considerable experience in NVC surveying across a wide range of habitats.

Surveys available include:

  • Hedgerow surveys

  • National Vegetation Classification surveys

  • Monitoring vegetation communities and plant species to determine their response to management

  • Specific plant species surveys

  • Lichen surveys

  • Lichen impact assessments

  • Lichen mitigation strategies

  • Invasive & Injurious Weed Watching Briefs

Invasive Species

An invasive species is a species that has been introduced to an area outside of its native range and has the potential to cause harm—or has already caused harm—in its new location.

Schedule 9 of the Wildlife and Countryside Act 1981(as amended) lists the current species for which it is an offence to introduce or cause to establish in the wild. Many of the species listed are already established in the wild however it remains an offense to release or introduce without a licence, allow to escape into the wild, or cause to be spread in the wild.

Part 1 of the schedule lists invasive animal species such as non-native crayfish, grey squirrel, mink and fat dormouse. These are able to out-compete native species and spread disease causing populations of native crayfish, red squirrel, water vole and hazel dormouse to decline.

Part 2 lists invasive plant species including aquatic species, rhododendron and Japanese knotweed. Plants may threaten native species by out-competing and spreading disease and some such as Japanese knotweed are vigorous to the extent, they can cause damage to buildings.

If a development or scheme will disturb invasive species it is possible this will constitute an offense. For example, removal of topsoil from a development containing Japanese knotweed may  facilitate the spread of this species and cause an offence to be committed if correct disposal is not followed.

enims' ecologists are competent to recognise invasive flora and fauna species as standard practice during field surveys. Mitigation and guidance are provided to ensure legal compliance.

Our Ecological Clerk of Works team are able to identify and make fast, informed identification and provide recommendations during vegetation clearance work to ensure appropriate mitigation whilst striving to prevent delays to works and always ensuring legal compliance.

If you require support for your project please call the enims team on 0845 644 0196.