气候对高山鸢尾属植物繁殖的直接和间接影响的时空变化

IF 2.6 3区 生物学 Q2 PLANT SCIENCES
Linn Vassvik, Vigdis Vandvik, Silje Andrea Hjortland Östman, Anders Nielsen, Aud H. Halbritter
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引用次数: 0

摘要

高山环境中的植物繁殖受到气候的影响,直接原因是气候对植物生长和物候的影响,间接原因是气候对影响授粉成功率的生物相互作用的影响。这些影响在时间和空间上的变化很大。在这项研究中,我们调查了不同的非生物因素和生物因素如何在两年时间内影响高山景观中的小牡丹种群的繁殖投资和成功率。在挪威南部芬斯的一个高山地区,我们测量了38个不同温度(与海拔有关)和生长季节长度(与融雪时间有关)地点的繁殖投资(种子总量)和繁殖成功率(种子结实率)。为了评估生物间的相互作用,我们测量了花的密度和授粉者的访问量,并进行了补充花粉实验。繁殖投资和成功率随温度升高而增加,但只有当花朵密度和/或传粉昆虫访问次数较高时才会增加,而且只有在较暖的年份(2016年)才会增加。在这两年中,鸢尾属植物的繁殖受花粉限制,尤其是在温度较高和融雪较早的地点。传粉昆虫的访问量随着温度的升高和花密度的增加而增加,这表明随着温度的升高,限制繁殖的生物因素(从植物到传粉昆虫)的相对重要性发生了变化。我们的研究表明,通过非生物和生物过程的交互作用,鸢尾属植物的繁殖投资和成功率受到气候的影响。这些影响在不同年份和不同地貌之间存在差异,表明在异质地貌中,气候变化的影响有可能在更大范围内得到缓冲。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Temporal and spatial variation in the direct and indirect effects of climate on reproduction in alpine populations of Ranunculus acris L

Temporal and spatial variation in the direct and indirect effects of climate on reproduction in alpine populations of Ranunculus acris L

Plant reproduction in alpine environments is affected by climate both directly through climate impacts on growth and phenology, and indirectly through impacts on the biotic interactions affecting pollination success. These effects can be highly variable in time and space. In this study we investigated how different abiotic and biotic factors influence reproductive investment and success in populations of Ranunculus acris across an alpine landscape over a two-year period. In an alpine area at Finse, southern Norway, we measured reproductive investment (total seed mass) and reproductive success (seed-set rate) in 38 sites differing in temperature (related to elevation) and length of the growing season (related to time of snowmelt). To assess biotic interactions, we measured floral density and pollinator visits and conducted a supplemental pollen experiment. Reproductive investment and success increased with temperature, but only when floral density and/or number of pollinator visits was high, and only in the warmer year (2016). Reproduction in R. acris was pollen-limited in both years, especially at warmer temperature and in sites with early snowmelt. Pollinator visits increased with temperature and with higher floral density, suggesting a shift in relative importance of the biotic factors (from plants to pollinators) in limiting reproduction with increasing temperature. Our study shows that reproductive investment and success in R. acris is affected by climate through the interactive effects of abiotic and biotic processes. These effects vary between years and across the landscape, suggesting a potential for larger-scale buffering of climate change effects in heterogeneous landscapes.

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来源期刊
Alpine Botany
Alpine Botany PLANT SCIENCES-
CiteScore
5.10
自引率
18.50%
发文量
15
审稿时长
>12 weeks
期刊介绍: Alpine Botany is an international journal providing a forum for plant science studies at high elevation with links to fungal and microbial ecology, including vegetation and flora of mountain regions worldwide.
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