Native and invasive seedling drought-resistance under elevated temperature in common gorse populations

Christina Mathias, Gire Céline, Bakker Mark, Leckie Alan, Xue Jianming, Clinton Peter W., Negrin-Perez Zaira, Arevalo Sierra Jose Ramon, Domec Jean-Christophe, Gonzalez Maya. 2023. Native and invasive seedling drought-resistance under elevated temperature in common gorse populations. Journal of Plant Ecology, 16 (3):rtac097, 16 p.

Résumé : The assumption that climatic growing requirements of invasive species are conserved between their native and non-native environment is a key ecological issue in the evaluation of invasion risk. We conducted a growth chamber experiment to compare the effect of water regime and temperature on the growth and mortality of native and invasive populations of common gorse seedlings (Ulex europaeus L.). Seeds were sampled from 20 populations of five areas from both native (continental France and Spain) and non-native areas (New Zealand, Canary and Reunion islands). The seedlings were grown over 36 days in two temperature treatments (ambient and elevated) combined with two water treatments (irrigated or droughted). The elevated temperature (ET) was defined as the highest temperature observed at the niche margin in the different countries. While ET increased seedlings growth, the drought treatment increased mortality rate and limited seedlings growth. Under ET and drought, native populations showed a greater mortality rate (53%) than invasive populations (16%). Invasive seedlings also showed higher above- and belowground development than native ones under these constrained climatic conditions. While phenotypic plasticity did not differ between native and invasive populations, the difference between populations in terms of total dry mass could be related to differences in the climate of origin (precipitation in particular). Assessing the importance of phenotypic changes between populations within invasive species is crucial to identify the margins of their climatic distribution range and to highlight areas where management efforts should be concentrated in order to limit its spread.

Mots-clés Agrovoc : espèce envahissante, dynamique des populations, changement climatique, Ulex, distribution géographique, phénotype, facteur climatique, plasticité phénotypique, écologie, organisme indigène, altitude, évaluation du risque

Mots-clés libres : Invasion, Alien plants, Drought, Climatic niche, Establishment

Classification Agris : F40 - Écologie végétale
H50 - Troubles divers des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Commission

Agences de financement hors UE : Agence Nationale de la Recherche, Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement, Conseil Régional de La Réunion, Ministère de l'Agriculture et de l'Alimentation

Projets sur financement : (FRA) Gestion et analyse de risque d'une plante invasive (Ulex europaeus (L.)): apports de la modélisation de la niche socio-écologique et de la dynamique de population de l'espèce le long d'un large gradient climatique, (FRA) Effet du changement climatique sur les stratégies d'amélioration de l'utilisation en eau des bassin versants et des systèmes agrosylvopastoraux Méditerranéens

Auteurs et affiliations

• Christina Mathias, CIRAD-PERSYST-UPR AIDA (REU) ORCID: 0000-0003-3618-756X - auteur correspondant
• Gire Céline, INRAE (FRA)
• Bakker Mark, INRAE (FRA)
• Leckie Alan, SCION (NZL)
• Xue Jianming, SCION (NZL)
• Clinton Peter W., SCION (NZL)
• Negrin-Perez Zaira, Universidad de La Laguna (ESP)
• Arevalo Sierra Jose Ramon, Universidad de La Laguna (ESP)
• Domec Jean-Christophe, INRAE (FRA)
• Gonzalez Maya, INRAE (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/603752/)

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