巴西森林-稀树草原过渡时期夹竹桃科植物范围大小和生命形式的比较丰富度格局

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
João de Deus Vidal, Christine B Schmitt, Ingrid Koch
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引用次数: 0

摘要

巴西湿润森林和稀树草原是新热带地区物种最丰富的生物群落之一。在这些区域之间的过渡地带,过渡带往往积累更高的分类多样性。然而,这些生态群落是由从邻近生物群系广泛分布的重叠物种组成,还是由一组特定的局部适应物种组成,仍然需要澄清。物种丰富度的区域差异可能受到物种环境耐受性、生命形式或物种范围大小等因素的影响。为了研究过渡带的物种丰富度,我们使用了夹竹桃科(Apocynaceae),包括广泛分布和狭窄分布的树木、藤本植物和灌木,作为模型来评估(i)过渡带中观察到的丰富度是由广泛分布的物种还是由局部适应的物种促进的;(ii)树木、藤本植物和灌木在稀树草原、过渡带和森林中表现出不同的丰富度格局;(3)在过渡带中发现的物种比科中其他物种具有更广泛的环境耐受性。我们使用了一个分类整理的地理参考数据集来比较巴西列出的夹竹桃科73属的643种物种的范围大小,其中包括藤本植物生命形式的298种和345种乔木、草本或灌木。我们记录了335种主要森林物种、56种稀树草原物种和152种过渡带物种,量化了物种丰富度、发生面积、降水和温度范围,并测试了生境和生态区之间的范围大小和环境耐受性差异。结果表明:(1)发生在过渡带的夹竹桃科物种比未发生在过渡带的夹竹桃科物种具有更大的地理分布范围;(ii)过渡带中藤本植物的面积加权丰富度高于其他生物;(3)在过渡带中发现的物种比局限于潮湿森林或稀树草原的物种具有更广泛的环境耐受性。这些结果表明,在巴西热带稀树草原和潮湿森林之间的过渡带中发现的物种丰富度并不一定是更高的地方性和局部适应性的结果,也可能是与邻近生物群系相关的广布物种重叠范围的结果。总之,我们的发现增加了我们对过渡带和生物群系的理解,这些过渡带和生物群系是连续的,渐进的生物地理过渡,而不是明确定义的生态单位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparative richness patterns of range sizes and life forms of Apocynaceae along forest–savanna transitions in Brazil
Abstract Brazilian moist forests and savannas are some of the most species-rich biomes in the Neotropics. In the transition zones between these regions, ecotones often accumulate even higher taxonomic diversity. However, whether these ecotonal communities consist of overlapping species widespread from the neighbouring biomes or a specific set of locally adapted species still needs to be clarified. Regional differences in species richness may be influenced by factors such as species' environmental tolerances, life forms, or species’ range sizes. To investigate the species richness found in ecotones, we used the ‘milk-weed’ family (Apocynaceae), which comprises both widespread and narrowly distributed trees, lianas, and shrubs, as a model to evaluate if (i) their observed richness in ecotones is promoted by widespread species or by locally adapted species; (ii) trees, lianas, and shrubs show different richness patterns in savannas, ecotones, and forests; and (iii) species found in ecotones have broader environmental tolerances than other species in the family. We used a taxonomically curated georeferenced dataset to compare the range sizes of 643 species of Apocynaceae from 73 genera listed for Brazil, comprising 298 species with a liana life form and 345 trees, herbs, or shrubs. We recorded 335 predominantly forest species, 56 savanna species, and 152 ecotone species, for which we quantified species richness, areas of occurrence, precipitation, and temperature ranges and tested for differences in range sizes and environmental tolerances between habits and ecoregions. Our results indicate that (i) Apocynaceae species occurring in ecotones have wider geographical ranges than species not occurring in ecotones; (ii) lianas showed higher area-weighted richness in ecotones than other life forms; and (iii) species found in ecotones had broader environmental tolerances than species restricted to moist forests or savannas. These results indicate that the species richness found in ecotones between savannas and moist forests in Brazil is not necessarily a consequence of higher endemism and local adaptation but may also be a result of overlapping ranges of widespread species typically associated with neighbouring biomes. Together, our findings add to our understanding of ecotones and biomes as continuous, gradual biogeographical transitions instead of sharply defined ecological units.
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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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