Common Tern Welfare: Colonial Seabird Management
Common terns (Sterna hirundo) nest in colonies on coastal and inland sites, with welfare shaped by food availability, predation pressure, and human disturbance.
Key Facts
- Common terns migrate to West Africa for winter and return to UK colonies in April
- Colonial nesting provides some protection but creates density-dependent disease and competition
- Fish availability in foraging areas directly determines chick survival rates
- Disturbance by visitors or predators can cause mass colony abandonment with total breeding failure
- Floating nest rafts have successfully maintained and established new colonies
Welfare Considerations
Common tern welfare during the breeding season is highly sensitive to disturbance at colonies. A single disturbance event causing mass colony flush can expose eggs and chicks to temperature extremes and aerial predators, leading to widespread chick mortality. Protected and wardened colonies achieve significantly better breeding success. Fish availability shapes adult welfare through foraging effort required to meet energy needs and feed chicks. Declining sandeel populations through climate change and fisheries effects has reduced food availability for terns across much of their range, creating chronic welfare pressure.
What You Can Do
- Maintain appropriate distances from tern colonies during the breeding season
- Volunteer as a warden at local tern colony protection programs
- Support fishing policies that protect sandeel and other small fish populations
- Donate to colonial seabird conservation programs
- Keep dogs on leads near tern nesting beaches from May to August