Where Have All the Eiders Gone? - Food Resource Availability Assessment
Buyer: NATURAL ENGLAND
- Published
- 18 November 2025
- Estimated value
- £19,250
- Place of performance
- UKC
- Procedure
- Open procedure
- Lots
- 1
- Notice number
- 074903-2025
- Reference
- ocds-h6vhtk-05d2c4
- Official source
- Official source
CPV codes
- 71354500Marine survey services
Description
At the GB scale, eider numbers have declined by c60% over the last 25 years. At an England scale, numbers have declined by c75% over 30+ years. Action to understand the causes of these declines and, if possible, to implement measures to halt or reverse the declines is urgent. Adult eiders preferentially feed on mussel, a resource which since 2012 has declined critically in Northumberland. This suggests that environmental changes leading to loss of mussel resources on this coast may have played some part in the eiders' decline. The present study is being commissioned to provide an assessment of food availability for eiders over the winter period. Eiders preferentially feed on mussels, a resource which since 2012 has declined critically in Northumberland. However, mussel beds persist in the Teesmouth and Cleveland Coast SPA, where wintering eiders occur. The study will determine the availability of mussels and alternate food sources at five sites in the region used by eiders. Intertidal rocky reef transect surveys will be conducted during the period of lowest possible tides in November or December (contingency) 2025. The period is chosen to assess the food availability to the overwin…
Awards
| Awarded to | Amount | Date |
|---|---|---|
| ENVISION MARINE LTD. | — | — |
Official publications
- FTS · 074903-2025 · 18 November 2025
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Frequently asked questions
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