Wintering Bird Surveys & Why They’re Important
The UK's diverse habitats provide crucial wintering grounds for a wide array of bird species. From the wildfowl and waders that grace our coastlines and wetlands to the passerines that rely on agricultural land for sustenance, these birds play an integral role in our ecosystems.
As development and land use change continue, it's vital that we understand and mitigate any potential impacts on these overwintering populations - which is where wintering bird surveys come in.
Brent Goose Flock by Owen Crawshaw
Why are wintering bird surveys necessary?
Wintering bird surveys are frequently required where development proposals could affect internationally designated bird populations or their habitats. In southern England, this often involves areas like coastal habitats, floodplain grasslands or large waterbodies frequented by wildfowl and waders.
However, agricultural land can also be crucial. Arable field margins or stubble fields can provide a vital food source for notable passerine species during the lean winter months.
These surveys are essential to:
Assess the presence and abundance of overwintering bird species. This helps identify potential conflicts between proposed developments and bird populations
Understand the use of specific habitats. Identifying key feeding, roosting or sheltering areas informs sensitive development design and mitigation measures
Inform planning decisions. Robust survey data can guide decision-makers in ensuring development proceeds without harming protected species or habitats
Pink-footed Goose Flock by Owen Crawshaw
When and how are wintering bird surveys carried out?
Current guidelines recommend a minimum of monthly surveys between November and February (the core wintering months). If the site has potential for passage migrants, surveys in October and March may also be necessary.
For particularly sensitive sites near protected areas for wildfowl, more frequent surveys might be needed.
During each survey visit, an experienced surveyor walks a pre-determined route, recording all birds encountered and mapping their distribution. For sites near the coast, surveys may be timed to coincide with high tide, when birds are more likely to be concentrated in accessible areas.
If you have a project that could impact overwintering birds, don't hesitate to get in touch. Our team of experienced ecologists can carry out comprehensive wintering bird surveys and provide expert advice on mitigation and enhancement measures.