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

IF 3 2区 环境科学与生态学 Q2 ECOLOGY
M. Christina, Céline Gire, M. Bakker, A. Leckie, J. Xue, P. Clinton, Z. Negrín-Pérez, J. R. ARÉVALO SIERRA, J. Domec, Maya Gonzalez
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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 growth and mortality of native and invasive populations of common gorse seedlings (Ulex europeaus, L). Seeds were sampled from 20 populations from 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 was defined as the highest temperature observed at the niche margin in the different countries. While elevated temperature increased seedlings growth, the drought treatment increased mortality rate and limited seedlings growth. Under elevated temperature 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.
普通金雀花群体在高温下的本地和入侵幼苗抗旱性
假设入侵物种的气候生长需求在其原生和非原生环境之间是保守的,这是评估入侵风险的一个关键生态问题。我们进行了一项生长室实验,以比较水情和温度对普通金雀花幼苗(Ulex europeau,L)本地和入侵种群生长和死亡率的影响。从五个地区(法国大陆和西班牙)和非本土地区(新西兰、加那利群岛和留尼汪群岛)的20个种群中取样种子。幼苗在两种温度处理(环境和高温)和两种水处理(灌溉或干旱)中生长36天。升高的温度被定义为在不同国家的生态位边缘观察到的最高温度。虽然高温增加了幼苗的生长,但干旱处理增加了死亡率,限制了幼苗的增长。在高温和干旱条件下,本地种群的死亡率(53%)高于入侵种群(16%)。在这些受限制的气候条件下,入侵幼苗也表现出比本地幼苗更高的地上和地下发育。虽然表型可塑性在本地种群和入侵种群之间没有差异,但种群之间总干物质的差异可能与起源气候(特别是降水)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,并强调应集中管理工作以限制其传播的领域至关重要。
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来源期刊
Journal of Plant Ecology
Journal of Plant Ecology 生物-植物科学
CiteScore
4.60
自引率
18.50%
发文量
134
审稿时长
3 months
期刊介绍: Journal of Plant Ecology (JPE) serves as an important medium for ecologists to present research findings and discuss challenging issues in the broad field of plants and their interactions with biotic and abiotic environment. The JPE will cover all aspects of plant ecology, including plant ecophysiology, population ecology, community ecology, ecosystem ecology and landscape ecology as well as conservation ecology, evolutionary ecology, and theoretical ecology.
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