Platforms – project 2025-29

As part of the 2025-29 project, the ZAL is relying on two platforms grouping together sites where research operations (instrumentation, monitoring, etc.) are carried out:

"Major waterways – Loire and tributaries" platform
"Catchment Heads" Platform

These platforms are intended to structure research within the LTER (Long-Term Ecological Research) site in the context of the e-LTER network, based on gradients: degree of human impact and positioning relative to the longitudinal, transversal, and vertical gradients of the hydrosystem.

At the scale of the two platforms, several questions are shared and are part of the broader questioning of the ZAL. These questions relate to the production of knowledge about the platforms, as well as methodological issues (choice of indicators, type of instrumentation, shared monitoring protocol, change of scale...).

How are the effects of global changes on matter or organism transfers, biodiversity, and the evolution of uses and governance modes measured?
How to move from data produced on sites to analysis at the platform and wider Loire basin scale?
What are the lessons learned from the observations on current and past dynamics of socio-ecosystems in the Loire region?

Within the platforms, are labelled Workshop sites the sites applying the different protocols defined at the platform level for each compartment studied, thus contributing to the possibility of exploiting data at different spatial scales (sites and basin) and time scales. These sites will also have to be regularly monitored for a minimum of 5 years and across at least 2 compartments (in the eLTER sense: atmosphere, hydrosphere, geosphere, biosphere, social and economic sphere), and will need to undertake transdisciplinary research (with local stakeholders) and/or inter-team research. Data banking must be up to date by the end of 2026 at the latest. Work on the annexe sites are complementary. The application of the protocols defined for the workshop sites is not systematic.

Platforms and sites – ZAL project 2025-29

Major Watercourses

The "Major Waterways" platform brings together several observation sites located along the Loire and its main tributaries, which have been regularly monitored for several years.

The "Major Waterways" platform is comprised of Workshop sites :

Armourizan Loire
Mareau-Beaugency (including the St-Mesmin National Nature Reserve)
Le Bas Allier (including the Val d’Allier National Nature Reserve)

Through its monitoring, the platform aims to answer the following questions:

What are the impacts of extreme weather (late submersion, severe low water levels, rise in water temperatures) on socio-ecosystems, uses and eco-hydro-sedimentary dynamics, at different scales of the river?
How do global changes modify the Material transfers (water, sediment, wood, contaminants) and system balances: river morphology, water quality, nutrients, and biological activity?
What are the consequences for biodiversity : physical conditions, competition for resources, biological interactions, species' adaptability, and the development of invasive species?
What changes in the uses and perceptions of the river What do we observe? How does knowledge circulate between researchers, institutions, and users, and what actions are being taken (management, restoration, governance)? Are they effective and socially accepted?
What does the past teach us? (history, archaeology, palaeogeography) on the functioning of the Loire and on the past and future trajectories of the Loire territories?

Basin Heads

The "Basin Heads" platform currently includes 5 workshop sites:

Louroux
Blois conurbation
Sewer worker (SNO Observil)
La Guette Peat Bog (SNO La Guette Peat Bog)
OPTmix – Orléans Forest (AnaEE)

Through its monitoring, the platform aims to answer the following questions:

How to define and measure global changes? What variables and indicators can be used to characterise it, according to the socio-ecosystems studied?
How do socio-ecological systems react in the long term In the face of pressures related to global change and human impact gradients? Are we observing gradual evolutions or ruptures (tipping points) that profoundly alter the functioning of environments (water, soils, sediments, vegetation)?
How to make this knowledge accessible and useful to stakeholders What levers can be used to improve transfer (tools, sensors, protocols, training) and support decision-making, including beyond instrumented sites?