Plasticity of traits and correlations in two populations of Convolvulus arvensis (Convolvulaceae) differing in environmental heterogeneity
Plasticity of traits and correlations in two populations of Convolvulus arvensis (Convolvulaceae) differing in environmental heterogeneity
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DOI：
10.1086/422050
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发表时间：
2004-09-01
影响因子：
2.3
通讯作者：
Gianoli, E
中科院分区：
文献类型：
--
作者：
Gianoli, E
生态学理论预测，通才策略在变化的环境中比在稳定的环境中更受青睐。我测试了来自暂时异质生境的植物的表型可塑性是否比来自更均匀生境的植物更大。此外，我还评估了原生地的环境异质性是否会影响环境胁迫与表型整合的关系，即表型性状之间的相关程度。以多年生杂草旋花（Convolvulus arvensis L.）为模式种。植物收集于位于智利中部同一地区的agrestal（燕麦田）和rudal（荒地）种群。生长季节的原位测量结果表明，原生态生境土壤湿度呈异质性，原生态生境土壤湿度呈均匀性，但光照强度呈异质性。在一个普通花园中，研究了两种光照水平（100%和20%充分日照）和两种水分处理（对照和低浇水）对光和水分的表型可塑性。尽管来自原始生境和原始生境的植物对光的表型可塑性程度非常相似，但来自原始生境的植物对水分的可塑性响应更大。这些结果与生境光和水分可用性的时间异质性一致，因此支持在不断变化的环境中通才策略的优势原则。环境胁迫与表型整合之间存在正相关关系。这种关系在来自原始生境的植物中更为明显。这些结果有助于阐明植物表型整合的生态学意义。
Ecological theory predicts that a generalist strategy should be more favored in changing environments than in stable environments. I tested whether phenotypic plasticity is greater in plants from a temporally heterogeneous habitat than in plants from a more homogeneous habitat. In addition, I evaluated whether the environmental heterogeneity of the original habitat influences the relationship between environmental stress and phenotypic integration, i.e., the degree of correlation among phenotypic traits. The perennial weed Convolvulus arvensis L. was used as a model species. Plants were collected in agrestal (oat field) and ruderal (wasteland) populations located in the same area of central Chile. In situ measurements during the growing season determined that the agrestal habitat was heterogeneous and the ruderal habitat homogeneous for soil moisture, but both habitats were heterogeneous for light intensity. Phenotypic plasticity to light and moisture was evaluated in a common garden, with two light levels (100% and 20% full sunlight) and two moisture treatments (control and low watering). Although the magnitude of phenotypic plasticity to light was very similar in plants coming from the agrestal and ruderal habitats, plastic response to moisture was greater in plants from the agrestal habitat. These results agree with the determination of habitat temporal heterogeneity for light and moisture availability, and hence support the tenet of predominance of a generalist strategy in changing environments. A positive relationship between environmental stress and phenotypic integration was verified. This relationship was stronger in plants from the ruderal habitat. These results contribute to the elucidation of the ecological significance of phenotypic integration in plants.