Estimation of pollen productivity and dispersal: How pollen assemblages in small lakes represent vegetation

IF 7.1 1区 环境科学与生态学 Q1 ECOLOGY Ecological Monographs Pub Date : 2022-02-20 DOI:10.1002/ecm.1513
Yao Liu, Kiona Ogle, Jeremy W. Lichstein, Stephen T. Jackson
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引用次数: 2

Abstract

Quantitative understanding of vegetation dynamics over timespans beyond a century remains limited. In this regard, the pollen-based reconstruction of past vegetation enables unique research opportunities by quantifying changes in plant community compositions during hundreds to thousands of years. Critically, the methodological basis for most reconstruction approaches rests upon estimates of pollen productivity and dispersal. Previous studies, however, have reached contrasting conclusions concerning these estimates, which may be perceived to challenge the applicability and reliability of pollen-based reconstruction. Here we show that conflicting estimates of pollen production and dispersal are, at least in part, artifacts of fixed assumptions of pollen dispersal and insufficient spatial resolution of vegetation data surrounding the pollen-collecting lake. We implemented a Bayesian statistical model that related pollen assemblages in surface sediments of 33 small lakes (<2 ha) in the northeastern United States, with surrounding vegetation ranging from 101 to >105 m from the lake margin. Our analysis revealed three key insights. First, pollen productivity is largely conserved within taxa and across forest types. Second, when local (within a 1-km radius) vegetation abundances are not considered, pollen-source areas may be overestimated for some common taxa (Cupressaceae, Pinus, Quercus, and Tsuga). Third, pollen dispersal mechanisms may differ between local and regional scales; this is missed by pollen-dispersal models used in previous studies. These findings highlight the complex interactions between vegetation heterogeneity on the landscape and pollen dispersal. We suggest that, when estimating pollen productivity and dispersal, both detailed local and extended regional vegetation must be taken into account. Also, both deductive (mechanistic models) and inductive (statistical models) approaches are needed to better understand the emergent properties of pollen dispersal in heterogeneous landscapes.

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花粉生产力和散布的估计:小湖泊中的花粉组合如何代表植被
对超过一个世纪时间跨度的植被动态的定量理解仍然有限。在这方面,基于花粉的过去植被重建通过量化数百年至数千年植物群落组成的变化,为研究提供了独特的机会。关键的是,大多数重建方法的方法学基础取决于花粉产量和散布的估计。然而,先前的研究得出了关于这些估计的相反结论,这可能被认为是对基于花粉重建的适用性和可靠性的挑战。在这里,我们表明,至少在一定程度上,花粉产生和传播的相互矛盾的估计是由于花粉传播的固定假设和花粉收集湖周围植被数据的空间分辨率不足造成的。我们建立了一个贝叶斯统计模型,对美国东北部33个小湖泊(2 ha)表层沉积物中的花粉组合进行了关联,这些湖泊周围的植被距离湖缘101 ~ 105 m。我们的分析揭示了三个关键见解。首先,花粉产量在分类群和不同森林类型中基本上是保守的。其次,当不考虑当地(1公里半径内)植被丰度时,一些常见分类群(柏科、松科、栎科和杉科)的花粉源面积可能被高估。第三,花粉传播机制在局部和区域尺度上可能存在差异;在以前的研究中使用的花粉传播模型忽略了这一点。这些发现强调了景观植被异质性与花粉传播之间复杂的相互作用。我们建议,在估计花粉产量和传播时,必须同时考虑详细的局部和扩展的区域植被。此外,还需要推导(机制模型)和归纳(统计模型)两种方法来更好地理解异质景观中花粉传播的涌现特性。
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来源期刊
Ecological Monographs
Ecological Monographs 环境科学-生态学
CiteScore
12.20
自引率
0.00%
发文量
61
审稿时长
3 months
期刊介绍: The vision for Ecological Monographs is that it should be the place for publishing integrative, synthetic papers that elaborate new directions for the field of ecology. Original Research Papers published in Ecological Monographs will continue to document complex observational, experimental, or theoretical studies that by their very integrated nature defy dissolution into shorter publications focused on a single topic or message. Reviews will be comprehensive and synthetic papers that establish new benchmarks in the field, define directions for future research, contribute to fundamental understanding of ecological principles, and derive principles for ecological management in its broadest sense (including, but not limited to: conservation, mitigation, restoration, and pro-active protection of the environment). Reviews should reflect the full development of a topic and encompass relevant natural history, observational and experimental data, analyses, models, and theory. Reviews published in Ecological Monographs should further blur the boundaries between “basic” and “applied” ecology. Concepts and Synthesis papers will conceptually advance the field of ecology. These papers are expected to go well beyond works being reviewed and include discussion of new directions, new syntheses, and resolutions of old questions. In this world of rapid scientific advancement and never-ending environmental change, there needs to be room for the thoughtful integration of scientific ideas, data, and concepts that feeds the mind and guides the development of the maturing science of ecology. Ecological Monographs provides that room, with an expansive view to a sustainable future.
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