Journal of Plant Ecology ›› 2023, Vol. 16 ›› Issue (3): 0-rtac097.DOI: 10.1093/jpe/rtac097

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  • 收稿日期:2022-07-26 修回日期:2022-10-08 接受日期:2022-11-05 出版日期:2023-06-01 发布日期:2022-11-15

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

Mathias Christina1,2,3,*, Céline Gire1, Mark R. Bakker1, Alan Leckie4, Jianming Xue4, Peter W. Clinton4, Zaira Negrin-Perez5, José Ramon Arevalo Sierra5, Jean-Christophe Domec1, Maya Gonzalez1   

  1. 1INRAE, Bordeaux Sciences Agro, UMR 1391 ISPA, F-33882 Villenave-d'Ornon, France;
    2CIRAD, PERSYST Department, UPR 115 AIDA, 97490 Sainte-Clotilde, La Reunion, France;
    3AIDA, PERSYST Department, Univ Montpellier, CIRAD, Montpellier, France;
    4New Zealand Forest Research Institute trading as Scion, 8440 Christchurch, New Zealand;
    5Department of Botany, Ecology and Plant Physiology, University of La Laguna, 38206 La Laguna, Spain
  • Received:2022-07-26 Revised:2022-10-08 Accepted:2022-11-05 Online:2023-06-01 Published:2022-11-15
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摘要: 入侵物种的气候生长需求在其本土和非本土环境之间保持一致的假设是评估入侵风险的关键生态学问题。本研究通过生长箱实验,比较水分和温度对普通金雀花幼苗(Ulex europaeus L.)本土种群和入侵种群生长和死亡率的影响。从本土(法国大陆和西班牙)和非本土(新西兰、加那利群岛和留尼旺岛)的5个地区的20个种群中采集了种子样本。幼苗在两种温度处理(环境温度和高温)和两种水处理(灌溉和干旱)中生长超过36天。温度升高被定义为在不同国家的生态位边缘观察到的最高温度。虽然温度升高增加了幼苗的生长,但干旱处理增加了死亡率并限制了幼苗的生长。在高温和干旱条件下,本土种群的死亡率(53%) 高于入侵种群(16%)。在这些受限的气候条件下,入侵幼苗的地上和地下发育也好于本土幼苗。虽然表型可塑性在本土种群和入侵种群之间没有差异,但种群之间总干物质生物量的差异可能与起源气候(尤其是降水)的差异有关。评估入侵物种种群之间表型变化的重要性对于确定其气候分布范围的边缘以及对突出应集中管理以限制其传播的区域都至关重要。

关键词: 入侵, 外来植物, 干旱, 气候生态位, 定植

Abstract: 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.

Key words: invasion, alien plants, drought, climatic niche, establishment