Source: https://tendernation.io/opportunities/01a13bc6-5ba5-7213-8341-895fb8a0107a/where-have-all-the-eiders-gone-food-resource-availability-assessment awarded GB open procedure Suitable for SMEs # Where Have All the Eiders Gone? - Food Resource Availability Assessment [Natural England](https://tendernation.io/buyers/natural-england) Estimated value £20,833 Published 18 Nov 2025 Deadline Closed 4 Nov 2025 ## Who can bid - Open to suppliers based in the UK The buyer has limited bidding to suppliers with substantive operations in this area. [PPN 005: reserving by supplier location](https://www.gov.uk/government/publications/ppn-005-reserving-below-threshold-procurements/ppn-005-guide-to-reserving-below-threshold-html) - Buyer says suitable for SMEs The buyer ticked “suitable for SMEs” on the notice. Anyone can still bid. - Below-threshold contract Buyers cannot shortlist bidders on suitability before tenders are in, so everyone gets to submit a bid (except some larger works contracts). [Procurement Act 2023, section 85](https://www.legislation.gov.uk/ukpga/2023/54/section/85) - Open procedure Anyone can submit a full tender; there is no shortlisting stage. [More contracts for small businesses and VCSEs](https://tendernation.io/opportunities/for-small-businesses) ## About this tender 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 overwintering eiders in the region. If interested, suppliers should provide: details of the methodology and approaches proposed to deliver the requirements of this project; qualifications and experience the proposed project team; a proposed timetable for the project, risk log, mitigation actions and a Gantt; and proposed project teams' experience and qualifications for operating safely in the environment and conditions required for the project. Read full description ## CPV classification Marine survey services Source Find a Tender (UK) · Notice ocds-h6vhtk-05d2c4-2025-11-18T16:00:20Z [View official notice](https://www.find-tender.service.gov.uk/Notice/ocds-h6vhtk-05d2c4-2025-11-18T16:00:20Z) Never miss a tender like this again Get AI summaries, deadline alerts and a bid pipeline for tenders matched to your business. Free to start. 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