Follow-up measures

Monitoring bats during the construction phase

Objectives and methodology

The methodology consists of equipping a ship as well as the Grand Léjon lighthouse with an acoustic system including an acoustic recorder, a microphone and a solar panel to power the system in order to evaluate and characterize the activity bats in the park area and surrounding areas. The objective is also to identify whether the construction site is a source of light attraction for bats and in particular the Nathusius Pipistrelle.

The acoustic recorders that will be used will have the particularity of detecting ultrasound over a previously defined range of frequencies and recording them.

The parameters that will be searched will be:

  • Identification of the species present;
  • Identifying their behavior;
  • Counting contacts made with bats.

A methodology similar to that used during the initial state will be implemented.

This measure will be carried out in partnership with Phares et Balises.

Location of actions


Schedule and Status


Measure under development

Monitoring will take place during bat migration periods, i.e. in spring and fall in 2021, 2022 and 2023.

    All follow-up measures

    Reduction measures

    Compensation measures

    Accompanying measures