The purpose of this contract is to carry out ecological investigations of habitats, fauna, flora, and wetlands along the Bordeaux-Toulouse section of the Grand Sud-Ouest Railway Project (GPSO). This contract includes the following lots:
- Lot 1: Coordination of all lots, Habitat inventories, flora, wetlands, and cross-expertise
- Lot 2: Terrestrial Fauna Inventories:
    o Terrestrial invertebrates,
    o Amphibians and Reptiles,
    o Large Fauna, Small Fauna, and semi-aquatic Mammals.
- Lot 3: Avifauna and Chiroptera Inventories
- Lot 4: Aquatic Fauna Inventories
    o Aquatic invertebrates,
    o Fish.

The duration of this contract is 14 fixed months.

The services in this contract include the following missions:
- Mission 0: Preparation phase (Lots 1, 2, 3, and 4)
- Mission 1: Preparation for field investigations (Lot 1)
- Mission 2: Field investigations (Lots 1, 2, 3, and 4)
- Mission 3: Presentation of field inventories, synthesis of issues and highlighting of significant changes and sites to avoid (Lots 1, 2, 3, and 4)
- Mission 4: Prioritization of issues (Lots 1, 2, 3, and 4)
- Mission 5: Mapping from GIS data: quantification of plant species and habitat functionality of species (Lot 1)
- Mission 6: Microorganisms and soil fauna (Lot 1)
- Mission 7: Spatial study of ecological corridors (Lot 1)
- Mission 8: Update of the bibliographic data analysis on the DAX Spain section (Lot 1)

LOT-0001
2025DOS1070445 / 2025RFI105832 - lot 1
Lot 1: Coordination of all lots, Habitat inventories, flora, wetlands, and cross-expertise.
The purpose of this lot is to coordinate all lots, inventory habitats, flora, wetlands, and cross-expertise.

The services in this lot include the following missions:
- Mission 0: Preparation phase
- Mission 1: Preparation for field investigations
- Mission 2: Field investigations
- Mission 3: Presentation of field inventories, synthesis of issues and highlighting of significant changes and sites to avoid
- Mission 4: Prioritization of issues
- Mission 5: Mapping from GIS data: quantification of plant species and habitat functionality of species
- Mission 6: Microorganisms and soil fauna
- Mission 7: Spatial study of ecological corridors
- Mission 8: Update of the bibliographic data analysis on the DAX Spain section

LOT-0002
2025DOS1070445 / 2025RFI105832 - lot 2
Lot 2: Terrestrial Fauna Inventories (Terrestrial invertebrates, Amphibians and Reptiles, Large Fauna, Small Fauna, and semi-aquatic Mammals).
The purpose of this lot is the terrestrial fauna inventories (Terrestrial invertebrates, Amphibians and Reptiles, Large Fauna, Small Fauna, and semi-aquatic Mammals)

The services in this lot include the following missions:
- Mission 0: Preparation phase
- Mission 2: Field investigations
- Mission 3: Presentation of field inventories, synthesis of issues and highlighting of significant changes and sites to avoid
- Mission 4: Prioritization of issues

LOT-0003
2025DOS1070445 / 2025RFI105832 - lot 3
Lot 3: Avifauna and Chiroptera Inventories.
The purpose of this lot is the avifauna and chiroptera inventories.

The services in this lot include the following missions:
- Mission 0: Preparation phase
- Mission 2: Field investigations
- Mission 3: Presentation of field inventories, synthesis of issues and highlighting of significant changes and sites to avoid
- Mission 4: Prioritization of issues

LOT-0004
2025DOS1070445 / 2025RFI105832 - lot 4
Lot 4: Aquatic Fauna Inventories (Aquatic invertebrates, Fish).
The purpose of this lot is the aquatic fauna inventories (Aquatic invertebrates, Fish)

The services in this lot include the following missions:
- Mission 0: Preparation phase
- Mission 2: Field investigations
- Mission 3: Presentation of field inventories, synthesis of issues and highlighting of significant changes and sites to avoid
- Mission 4: Prioritization of issues