Follow-up actions

Monitoring of breeding colonies

Objectives and methodology

The objective of the measure is to improve knowledge of the breeding colonies in Saint-Brieuc Bay. This monitoring is not intended to replace the actions already carried out in the area, but to complement them in order to refine knowledge about local breeding colonies.

The scientific protocol setting out the technical modalities of the field actions was established jointly between Ailes Marines and local stakeholders (Bretagne vivante, GEOCA, Syndicat Mixte Grand Site Cap d'Erquy Cap Fréhel, and VivArmor). The coordinator for the implementation of the monitoring is the GEOCA. The 7 Islands site was excluded after discussions with the LPO because it is already particularly well monitored and known.

All species of breeding birds are monitored, particularly Great Cormorants, Gulls, Storm-Petrels, Shearwaters, Alcids, Black-legged Kittiwakes and Terns.

3 types of follow-up have been identified

Classic follow-ups

From the Scientific Interest Group for Marine Birds (GISOM) for species whose parameters are not or little known.


Broad prospecting

To identify possible nesting areas not known to date.

Drone tracking

Which will allow us to approach certain species that cannot be approached by conventional means.

This video was taken during a monitoring of breeding colonies carried by Ailes Marines, in May 2020, and directed by VivArmor Nature on the Ilot du Verdelet (Drone provider: Littomatique). The objective is to carry out a census of the species present on the Islet du Verdelet, in order to estimate the number of nesting birds present, as well as the number of nests and chicks of the year. These indicators make it possible to monitor these breeding species and improve knowledge of these populations.

Once analysed, the data will be stored in a public database (ORA).

Location of actions

Monitoring will be carried out in five colonies: Fréhel, Verdelet, Bréhat, Plouha and Cézembre.


Planning and Status


Measure currently in place

Seven years of monitoring are planned, according to the following schedule:


  • In the pre-construction phase 87% 87%


  • In the construction phase 0% 0%

2024, 2025, 2026, 2034, 2044

  • In the operational phase 0% 0%

All follow-up actions

Reduction measures

Compensation measures

Accompanying measures