The impact of pollinator functional traits on pollination effectiveness is shaped by floral morphs in distylous plant species

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Ruirui Liu, Delai Chen, Shujuan Xu, Yi Zou
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Abstract

Insect pollinators provide essential ecosystem services, and pollination effectiveness is a key factor in evaluating the relative importance of different insect species. While single-visit deposition (SVD) of pollen on virgin stigmas by insects is usually used to measure pollination effectiveness, how SVD is correlated with species behavioural and morphological traits is poorly understood for different floral morphs. Here, we used distylous common buckwheat (Fagopyrum esculentum Moench) as a model to understand the relationship between SVD and pollen load, key morphological and behavioural traits of pollinators, and how such relationships differ between different floral morphs. We quantified SVD for 16 insect species and measured the body length, proboscis length, pollen load on different parts of the body, and average visit duration for each species. The results showed that SVD is generally positively correlated with pollen load. SVD is significantly positively associated with species body length but negatively associated with proboscis length for thrum flowers but not for pin flowers. Similarly, positive relationships between SVD and visit duration were observed for thrum flowers, but no significant relationship was observed for pin flowers, while flower visit duration was negatively associated with proboscis length. This study also indicates trait-matching between flowers and pollinators, i.e. the short proboscis length is well matched with the short stamen (pin flower) and short style (thrum flower) and hence promotes compatible pollen deposition on thrum flowers. Our study suggests that morphological trait-matching between flowers and pollinators influences the outcome of plant–pollinator interactions, contributing to variations in pollination effectiveness among different pollinators.
传粉昆虫的功能特性对授粉效果的影响取决于二歧植物物种的花朵形态
昆虫授粉者提供重要的生态系统服务,授粉效果是评估不同昆虫物种相对重要性的关键因素。虽然昆虫在原始柱头上的单次花粉沉积(SVD)通常被用来衡量授粉效果,但对于不同的花形态,SVD如何与物种的行为和形态特征相关却知之甚少。在这里,我们以二叉荞麦(Fagopyrum esculentum Moench)为模型,了解SVD与花粉量、传粉昆虫的关键形态和行为特征之间的关系,以及这种关系在不同花形态之间有何不同。我们对 16 种昆虫的 SVD 进行了量化,并测量了每种昆虫的体长、探喙长度、身体不同部位的花粉负载量和平均访问持续时间。结果表明,SVD 一般与花粉量呈正相关。SVD与物种体长呈显著正相关,但与探针长度呈显著负相关。同样,SVD 与鹅掌楸花的访花持续时间呈正相关,但与簪花的访花持续时间无显著关系,而访花持续时间与探针长度呈负相关。这项研究还表明了花与传粉媒介之间的性状匹配,即短的探针长度与短的雄蕊(簪花)和短的花柱(鹅掌楸花)非常匹配,从而促进了花粉在鹅掌楸花上的相容沉积。我们的研究表明,花朵与传粉昆虫之间的形态特征匹配会影响植物与传粉昆虫相互作用的结果,从而导致不同传粉昆虫的传粉效果不同。
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
审稿时长
3.5 months
期刊介绍: The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.
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