Climate‐related geographical variation in performance traits across the invasion front of a widespread non‐native insect
Climate‐related geographical variation in performance traits across the invasion front of a widespread non‐native insect
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广泛分布的非本地昆虫入侵前线表现特征与气候相关的地理变化
DOI：
10.1111/jbi.14005
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发表时间：
2020
影响因子：
3.9
通讯作者：
Grayson, Kristine L.
中科院分区：
文献类型：
--
作者：
Thompson, Lily M.;Powers, Sean D.;Appolon, Ashley;Hafker, Petra;Milner, Lelia;Parry, Dylan;Agosta, Salvatore J.;Grayson, Kristine L.
入侵物种是测试性能特征的地理差异和测量物种在不同气候和生境中传播时的进化反应的理想系统。欧洲吉普赛蛾--舞毒蛾Lymantria disdisar L.是一种多面性森林食叶害虫，于1869年被引进美国马萨诸塞州的梅德福德。入侵前线从明尼苏达州延伸到北卡罗来纳州，该物种适应当地气候的能力可能有助于其继续传播。我们评估了沿入侵锋面气候梯度的种群表现，以测试气候和生态重要表现之间的关系。方法对美国入侵前线和入侵范围内的14个种群的幼虫从孵化到成虫羽化在6种恒温处理下饲养。结果除雌性发育时间外，来源气候与饲养温度之间没有显著的交互作用，表明种群间的温度反应常值差异不大。来源种群和饲养温度对成虫存活率和蛹质量有显著的预测作用。与饲养温度无关，来自较温暖气候的种群存活率低于来自较冷气候的种群，但尽管发育时间相似，但获得了更大的体型。幼虫的发育时间依赖于饲养温度，但与来源气候的关系并不一致。主要结论热适应可能是影响入侵物种传播的重要因素，特别是在气候变化的背景下。我们的结果表明，L。D.差异很大，但随着它在北美蔓延，它在热性能和生活史特征上经历了与气候相关的适应。
AimInvasive species are ideal systems for testing geographical differences in performance traits and measuring evolutionary responses as a species spreads across divergent climates and habitats. The European gypsy moth,Lymantria dispar disparL. (Lepidoptera: Erebidae), is a generalist forest defoliator introduced to Medford, Massachusetts, USA in 1869. The invasion front extends from Minnesota to North Carolina and the ability of this species to adapt to local climate may contribute to its continuing spread. We evaluated the performance of populations along the climatic gradient of the invasion front to test for a relationship between climate and ecologically important performance traits.LocationEastern United States of AmericaTaxonLymantria dispar disparL. (Lepidoptera: Erebidae)MethodsInsects from 14 populations across the US invasion front and interior of the invasive range were reared from hatch to adult emergence in six constant temperature treatments. The responses of survival, pupal mass and larval development time were analysed as a function of source climate (annual mean normal temperature), rearing temperature and their interaction using multiple polynomial regression.ResultsWith the exception of female development time, there were no significant interactions between source climate and rearing temperature, indicating little divergence in the shape of thermal reaction norms among populations. Source population and rearing temperature were significant predictors of survival and pupal mass. Independent of rearing temperature, populations from warmer climates had lower survival than those from colder climates, but attained larger body size despite similar development times. Larval development time was dependent on rearing temperature, but there were not consistent relationships with source climate.Main ConclusionsThermal adaptation can be an important factor shaping the spread of invasive species, particularly in the context of climate change. Our results suggest thatL. d. disparis highly plastic, but has undergone climate‐related adaptation in thermal performance and life‐history traits as it spread across North America.