Vertical Gradient of Epiphytic Bryophytes in the Amazon: the Rule and its Exception

IF 0.5 3区生物学 Q4 PLANT SCIENCES

Cryptogamie Bryologie Pub Date : 2020-03-18 DOI:10.5252/cryptogamie-bryologie2020v41a5

E. Garcia, S. M. Oliveira, A. C. Tavares-Martins, Kátia C. Pôrto

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引用次数: 2

Abstract

ABSTRACT In Amazonian Terra Firme vegetation, epiphytic bryophytes present a deterministic distribution along height zones in host trees, at both local and regional scale. Recent findings about the influence of vegetation structure variation on epiphytic bryophyte assemblages suggest that the vertical gradient may also change among adjacent vegetation types. In order to analyze this influence, bryophytes were sampled in five zones from the base to the top of 24 host trees in Várzea and Igapó (flooded) and Terra Firme (non-flooded) vegetation. The species richness and diversity, distribution of guilds of tolerance to light incidence, floristic similarity, and turnover of species composition were evaluated within and between vegetation types. The vertical gradient was observed only in Igapó and Terra Firme. Species richness and diversity were higher at the base in flooded forests, and at the outer canopy in non-flooded forests. These zones also showed higher floristic similarities among vegetation types. The distribution of guilds explained the main patterns observed in assemblages. The spatial distribution of epiphytes in the studied forests is regulated by the interaction between the height zone and vegetation type, and light tolerance is one of the most important attributes explaining the distribution patterns of epiphytes in the Amazon.

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亚马逊地区附生苔藓植物的垂直梯度:规律与例外

在亚马逊地区的Terra Firme植被中，附生苔藓植物在局地和区域尺度上沿寄主树的高度带呈现确定性分布。最近关于植被结构变化对附生苔藓植物组合影响的研究表明，相邻植被类型之间的垂直梯度也可能发生变化。为了分析这种影响，在Várzea和Igapó(淹水)植被和Terra Firme(未淹水)植被中，从24棵寄主树的基部到顶部的5个区域取样苔藓植物。对不同植被类型内和不同植被类型间的物种丰富度和多样性、耐光照行会分布、植物区系相似性和物种组成更替进行了评价。垂直梯度仅在Igapó和Terra Firme中观察到。物种丰富度和多样性在水淹林的基部和非水淹林的外冠层较高。这些带在植被类型上也表现出较高的区系相似性。行会的分布解释了在集合中观察到的主要模式。研究森林中附生植物的空间分布受高度带和植被类型的相互作用调控，耐光性是解释亚马逊雨林附生植物分布格局的重要属性之一。

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来源期刊

Cryptogamie Bryologie 生物-植物科学

CiteScore

2.10

自引率

25.00%

发文量

审稿时长

3 months

期刊介绍： Cryptogamie is a fully electronic journal, with a continuous publication stream, devoted to a wide diversity of cryptogamic topics, mainly in the taxonomic-phylogenetic field. Cryptogamie, Bryologie accepts articles on systematics as well as ecology and evolution of all of bryophytes. Thematic issues may also be published under the responsibility of a guest editor.