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.

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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.