# National management strategies of IAPs of EU concern that are widespread in mainland France

Arnaud Albert, Madeleine Freudenreich

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## To cite this version:

Arnaud Albert, Madeleine Freudenreich. National management strategies of IAPs of EU concern that are widespread in mainland France. 11th International Conference on Biological Invasions, Sep 2020, Vodice, Croatia. . hal-04914171

HAL Id: hal-04914171

https://ofb.hal.science/hal-04914171v1

Submitted on 27 Jan 2025

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Distributed under a Creative Commons Attribution 4.0 International License
# National management strategies of IAPs of EU concern that are widespread in mainland France

### Arnaud ALBERT<fnref n="1" />* and Madeleine FREUDENREICH<fnref n="2" />

Contact e-mail of the corresponding author : *arnaud.albert@ofb.gouv.fr

## Objectives of the national management strategies

For **invasive alien plants (IAP) of European Union (EU) concern that are widely spread in mainland France**, such as Giant hogweed (*Heracleum mantegazzianum*), Eastern baccharis (*Baccharis halimifolia*) or Himalayan balsam (*Impatiens glandulifera*), national eradication is no longer conceivable, because not all known populations can be managed due to lack of stakes, impacts or means. Choices have to be made on **where and how to manage the existing populations**.

In connection with the European IAS Regulation, the National IAS Strategy, the French Environment Code and the French Biodiversity Plan, the French Biodiversity Office (OFB), the network of National Botanical Conservatories (CBN) and the IUCN French Committee (UICN France), with the collaboration of the French Agency for Environmental Health and Safety (ANSES), and the participation of researchers, botanists and practitioners, are thus developing **national management strategies (NMS)** for these species.

Mostly intended for **regional coordinations and local managers on IAPs**, NMS aim to **provide a decision support tool** to determine gradually **priority regions, areas, populations and interventions**, in order to limit the occupancy and reduce the damages of the concerned species.

## Part I of a NMS : well know the species to better intervene

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### Example
the Giant hogweed

Monocarpic
perennial
herbaceous
species of the
Apiaceae family

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### An invasive species

* Ornamental introduction in gardens

* Production between 5 000 and 100 000 seeds per single plant

* Spread of seeds by wind, water and human along roads, railways and rivers

* Persistance of the seed bank in the soil for more than 7 years

* Photodermatities caused by the sap

### A widespread species

Habitats with good resource supplies, high light and humidity levels, disturbance or lack of regular management

Ex.: riparian forest, forest edge and clearing, meadows, wasteland, roadsides, etc.

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(SIFLORE and GBIF, 2019)

## Part II of a NMS : where to intervene and with which objectives

1. **Prediction of the probability of establishment based on current occurrences (both in the native and introduced ranges) and the level of climatic suitability**

Climatic variables used : temperature, precipitation, seasonality, moisture index, etc.

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2. **Delimitation of different zones according to regional boundaries, based on a cross between population density and establishment risk**

<figure><img src="image_7.png" /></figure>

Moderately favorable and moderately invaded zones

Lowly favorable and weakly invaded zones

3. **Definition of global management objectives for the administrative regions**

Taking in account existing regional management plans and voluntary actions

<table><thead><tr><th rowspan="2">Management objective</th><th colspan="4">Eradication</th></tr><tr><th>Control</th><th></th><th></th><th></th></tr></thead><tbody><tr><td>Zone</td><td>I</td><td>II</td><td>III</td><td>IV</td></tr></tbody></table>

Early detection and rapid response (EDRR) should be applied in zones III and IV

## Part III of a NMS : how to intervene and when

### BEFORE

The choice of the intervention method has to be based on :

* defined objective

* site conditions

* technical feasibility

* human resources

* etc.

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### Overview of the best management practices :

#### Eradication

* manual removal

* cutting below the root collar

* tillage

* glyphosate and triclopyr *

### AFTER

Follow-up measures have to be implemented and **further repeated treatment** may be necessary

Restoration → local native plants

Ultimate waste → landfills

Green waste → composting centres or certified centres for incineration

#### DURING

#### Control

* mowing or mulching

* inflorescences removal

* controlled use of grazing animals

* planting competitive native species

4. **Identification of populations located in areas with high biodiversity stakes**

National and regional nature reserves, regional natural parks, national parks, biotope protection acts, etc.

<figure><img src="image_9.png" /></figure>

5. **Prioritization of populations with the use of a scoring method based on several criterions**

* direct hazard to human health

* feasibility of the management

* threat for local biodiversity

* size of the population

* spread risk

* etc.

6. **Definition of local management objectives per population respecting regional management objectives**

Population objective

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or

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Eradication

Control

## Conclusions and perspectives

* NMS will **support and encourage French regions to develop action plans and improve effective coordination** at their own level but also amongst each other

* Declination of NMS into **regional management plans (RMP)** by regional coordinators on IAPs will allow a more precise identification of the priority populations at local scale with tailored objectives

* This model will be **used for each of the widespread IAPs of EU concern** and could be **used by other Member States as guidelines**

* NMS will be revised every 5 years to reflect current trends and take in account new management practices

### Citation of the guide of help in the development of NMS :

Freudenreich, M., et Albert, A. (2019). Guide pour l'aide à la rédaction des stratégies nationales de gestion relatives aux espèces végétales exotiques envahissantes. Agence française pour la biodiversité. 39 pp.

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RÉPUBLIQUE
FRANÇAISE

Liberté
Egalité
Fraternité

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OFB
OFFICE FRANÇAIS
DE LA BIODIVERSITÉ

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UICN

Comité
Français

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CENTRE DE RESSOURCES
ESPECES EXOTIQUES
ENVAHISSANTES

anses
agence nationale de sécurité sanitaire
alimentation, environnement, travail

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<footnote n="1">¹French Biodiversity Office (OFB), Research and Scientific Support Division (DRAS), Flora and Vegetation Unit (UFV), Vincennes (94300), France</footnote>

<footnote n="2">²French Committee of the International Union for Conservation of Nature (IUCN), French Invasive Alien Species Resource Center (CDR), Montreuil (93100), France</footnote>

<footnote>* as a last resort and in accordance with existing regulations</footnote>