Wood Anatomical and Hydraulic Traits of Tamarix Species Across a Large Eurasian Gradient Show a Stronger Climatic Than Phylogenetic Signal

IF 3.4 2区环境科学与生态学 Q2 ECOLOGY

Journal of Biogeography Pub Date : 2025-02-03 DOI:10.1111/jbi.15096

Akbar Akhmedov, Nodirjon Bobokandov, Henrik Krehenwinkel, Andreas Rzepecki, Tamir Klein, Jose L. Villar, Frank M. Thomas

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Abstract

Aim

Tamarisk (Tamarix) is the predominant but taxonomically complex genus of the Tamaricaceae. The morphologically similar shrub or tree species grow in arid, salt-influenced habitats of Eurasia and Africa. We sampled woody shoots of seven species at the eastern margin (NW China; T. ramosissima) and the centre (Uzbekistan; T. hispida) of the Indo-Turanian region as well as at the eastern (Israel; T. aphylla, T. negevensis, T. nilotica) and western margin (southern Spain; T. boveana, T. gallica) of the Mediterranean region, the two diversity centres of the genus. To explore the drivers of intrageneric trait variability, we investigated whether differences in the anatomical-hydraulic wood traits among the species are related to climate or phylogeny.

Location

Eurasia.

Taxon

Tamarix L. (Tamaricaceae).

Methods

We determined features of wood anatomy and calculated the hydraulic conductivity (k_t) and the water potential at 50% loss of hydraulic conductance (P₅₀). We related these traits to climate variables and to the phylogenetic distances among the species.

Results

Tamarix nilotica, T. negevensis and T. ramosissima exhibited large conduit areas, large hydraulic diameters and high k_t, whereas the Spanish species T. gallica and T. boveana displayed high wood densities and a small fraction of large conduits. The phylogenetically distant species T. aphylla and T. hispida took intermediate positions. Tamarix ramosissima, which grows in regions with cold winters and hot-dry summers, exhibited the most negative P₅₀ values, indicative of a low susceptibility to a failure of the water-conducting system. Trait differences among the species were unrelated to the species' phylogenetic relatedness but correlated with climate variables.

Main Conclusions

Despite strong similarity in morphology and habitat preferences, Tamarix species displayed significant differences in their anatomical-hydraulic traits. These differences were related to climate conditions rather than phylogeny and are indicative of specific local adaptations to environmental conditions.

Abstract Image

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跨欧亚大梯度柽柳木材解剖和水力特征显示气候信号强于系统发育信号

目的柽柳是柽柳科的优势属，但分类学上较为复杂。形态相似的灌木或乔木种生长在欧亚大陆和非洲干旱、受盐影响的栖息地。我们在中国东部边缘对7种木本枝条进行了取样。T. ramosissima)和中心(乌兹别克斯坦；印度-图兰地区以及东部(以色列；葡萄球菌，阴性葡萄球菌，nilotica葡萄球菌)和西部边缘(西班牙南部；地中海地区的T. boveana， T. gallica)，属的两个多样性中心。为了探索种内性状变异的驱动因素，我们研究了物种间解剖-水力木材性状的差异是否与气候或系统发育有关。位置欧亚大陆。柽柳科柽柳分类群。方法测定木材的解剖特征，计算水导率（kt）和水导率损失50%时的水势（P50）。我们将这些特征与气候变量和物种间的系统发育距离联系起来。结果nilotica、T. negevensis和T. ramosissima的导管面积大、水力直径大、kt值高，而西班牙种T. gallica和T. boveana的木材密度高、大导管比例小。在系统发育上距离较远的种葡萄球菌（T. aphylla）和hispida居中间位置。生长在冬冷夏热干燥地区的柽柳的P50值最负，表明其对输水系统故障的敏感性较低。物种间的性状差异与物种的系统发育亲缘关系无关，但与气候变量相关。主要结论柽柳种间在形态和生境偏好上具有较强的相似性，但在解剖水力性状上存在显著差异。这些差异与气候条件有关，而不是与系统发育有关，表明了当地对环境条件的特定适应。

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来源期刊

Journal of Biogeography 环境科学-生态学

CiteScore

7.70

自引率

5.10%

发文量

203

审稿时长

2.2 months

期刊介绍： Papers dealing with all aspects of spatial, ecological and historical biogeography are considered for publication in Journal of Biogeography. The mission of the journal is to contribute to the growth and societal relevance of the discipline of biogeography through its role in the dissemination of biogeographical research.