Plant size influences specific leaf area in palms: a case for the diminishing returns hypothesis.

IF 2.3 2区 环境科学与生态学 Q2 ECOLOGY
Gerardo Avalos, Kaila Frazer, Hélène Le Gall
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Abstract

Body size is essential in determining an organism's functional performance and metabolic requirements, influencing biological processes from organisms to ecosystems. Metabolic scaling theory integrates the size-metabolism relationship, yet most research overlooks intraspecific trait variation due to ontogeny. Specific leaf area (SLA) is a critical functional trait that reflects investment on photosynthetic tissues relative to leaf construction costs. SLA influences photosynthetic capacity and growth rates and varies across life stages. While plants exhibit interspecific differences in acquisitive (high SLA, fast growth) and conservative (low SLA, slow growth) strategies, the diminishing returns hypothesis suggests that these strategies are shaped by the proportion of supporting structures that develop over the plant´s lifespan (intraspecific variation), predicting a negative SLA relationship with increasing size. In tropical environments, palms are ecologically important yet still understudied in functional traits. Here, we examine the relationship between SLA and size in six neotropical understory and canopy palm species (236 individuals). Results showed higher SLA in understory species and a negative SLA-size relationship across most species. SLA inversely correlated with leaf thickness and leaf water content. ANCOVA models explained substantial SLA variation related to palm size, with species-specific differences in regression slopes. These findings underscore the importance of considering inter- and intraspecific SLA variation and ontogenetic changes. Understanding the trade-off between acquisitive and conservative strategies within the context of the diminishing returns hypothesis offers insights into plant growth strategies and their ecological implications, which is essential for predicting plant adaptation to environmental gradients.

植物大小影响棕榈的特定叶面积:收益递减假说的一个案例。
体型大小是决定生物体功能性能和代谢需求的关键,影响着从生物体到生态系统的生物过程。代谢标度理论整合了尺寸-代谢关系,但大多数研究忽略了个体发生引起的种内性状变异。比叶面积(SLA)是反映光合组织投资相对于叶片建设成本的关键功能性状。SLA影响光合能力和生长速率,并且在不同的生命阶段有所不同。虽然植物在获取(高SLA,快速生长)和保守(低SLA,缓慢生长)策略上表现出种间差异,但收益递减假设表明,这些策略是由植物一生中发育的支持结构的比例(种内变异)决定的,预测SLA与尺寸的增加呈负相关。在热带环境中,棕榈树具有重要的生态意义,但在功能性状方面仍未得到充分研究。本文研究了6种新热带林下和冠层棕榈树(236个个体)的SLA与大小的关系。结果表明:林下物种的SLA较高,大部分物种的SLA与大小呈负相关。叶片水分含量与叶片厚度呈负相关。ANCOVA模型解释了与手掌大小相关的大量SLA变化,以及回归斜率的物种特异性差异。这些发现强调了考虑种间和种内SLA变化和个体发生变化的重要性。在收益递减假设的背景下,理解获取策略和保守策略之间的权衡关系,有助于深入了解植物的生长策略及其生态含义,这对于预测植物对环境梯度的适应至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Oecologia
Oecologia 环境科学-生态学
CiteScore
5.10
自引率
0.00%
发文量
192
审稿时长
5.3 months
期刊介绍: Oecologia publishes innovative ecological research of international interest. We seek reviews, advances in methodology, and original contributions, emphasizing the following areas: Population ecology, Plant-microbe-animal interactions, Ecosystem ecology, Community ecology, Global change ecology, Conservation ecology, Behavioral ecology and Physiological Ecology. In general, studies that are purely descriptive, mathematical, documentary, and/or natural history will not be considered.
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