SSSI Areas of Search: The History of Site Notification in the UK
Sites of Special Scientific Interest (SSSIs) are critical tools for nature conservation in the United Kingdom. To manage the notification of these sites effectively, the UK utilizes a geographical framework known as the Area of Search (AOS). This system ensures that conservation efforts are organized and systematically tracked across different regions.
The Origins of the Area of Search System
The concept of the Area of Search was developed between 1975 and 1979 by the Nature Conservancy Council (NCC). An AOS is defined as a geographical region ranging in size from 400 km² (approximately 150 sq mi) to 4,000 km² (approximately 1,500 sq mi). These areas were designed to provide a structured way to identify and notify SSSIs based on the administrative boundaries established by the Local Government Act 1972.
In England, the Areas of Search were based on 46 counties. However, the approach in Wales was more complex, utilizing a combination of counties and smaller districts. In 1974, Wales was divided into 8 counties and 37 districts, leading the NCC to create 12 specific Welsh Areas of Search.
While most Welsh AOS boundaries followed county lines, larger counties—specifically Dyfed, Powys, and Gwynedd—were split into multiple Areas using district borders. Additionally, Mid and South Glamorgan were merged into a single AOS, while the Llanelli district was incorporated into the West Glamorgan AOS.
[ไม่มีภาพประกอบ]Evolution and Modern Administration
Over time, local government reorganizations in the UK have led to many counties and districts being renamed, merged, or divided. This evolution created a challenge for the Countryside Council for Wales (CCW), as searching for SSSI citations using only the original 1972 AOS system would require users to have detailed knowledge of obsolete regional divisions.
To resolve this, the CCW updated its grouping method. They now organize Welsh SSSIs according to the 22 principal areas established in April 1996 under the Local Government (Wales) Act 1994. This modernization ensures that the database remains accessible and relevant to current administrative boundaries.
A practical example of this system is the Ceredigion AOS, which is located within the county of Ceredigion.
Key Facts
- AOS Size: Ranges from 400 km² to 4,000 km².
- Development Period: Created between 1975 and 1979 by the Nature Conservancy Council (NCC).
- English Basis: Based on 46 counties.
- Welsh Basis: Originally 12 Areas of Search based on 1974 county and district divisions.
- Modern Welsh Grouping: Now organized into 22 principal areas as of April 1996.
Summary of AOS Framework
| Region | Original Basis (1970s) | Modern Basis (Post-1996) | Defining Authority |
|---|---|---|---|
| England | 46 Counties | Varies by reorganization | NCC |
| Wales | 12 Areas of Search | 22 Principal Areas | NCC / CCW |
Frequently Asked Questions
What is an Area of Search (AOS)?
An Area of Search is a designated geographical region, typically between 400 km² and 4,000 km², used by the UK to notify and manage Sites of Special Scientific Interest (SSSIs).
Who developed the AOS system?
The system was conceived and developed between 1975 and 1979 by the Nature Conservancy Council (NCC).
Why did the Countryside Council for Wales change how SSSIs are grouped?
Because local government reorganizations since 1972 changed county and district boundaries, the CCW shifted to the 22 principal areas established in 1996 to make the database easier to search.
How were the original Welsh Areas of Search determined?
They were based on the 1974 division of Wales into 8 counties and 37 districts. While most followed county borders, larger counties like Gwynedd, Powys, and Dyfed were split into multiple areas.
Which act of parliament defined the modern principal areas in Wales?
The 22 principal areas were formed in April 1996 by the Local Government (Wales) Act 1994.