Species adaptation and their response to the warming climate offer understanding into the present geographical distribution and may assist in improving predictions regarding the expected response to future climate change. As a result, assessing the distribution and potentially suitable habitats is key for conserving important vulnerable species such as Perkinsiodendron macgregorii, a rare tree species of high ornamental value distributed only in the subtropical forests of China. In this study, 101 sampling points distributed in China and 11 climatic variables were selected and imported into the maximum entropy model (MaxEnt). We simulated the spatiotemporal dynamics of potential habitats under past, current, and future (2050s and 2070s) scenarios and found that the total suitable area for P. macgregorii is 1.67 × 106 km2 in recent times. This area is mainly located in seven provinces of southern China (Zhejiang, Anhui, Jiangxi, Fujian, Hunan, Guangdong, and Guangxi). The habitat centroid of P. macgregorii has been in Jiangxi province from the past to the 2070s. In both the lowest and the highest emission scenarios (RCP2.6 and RCP8.5), the potential distribution of P. macgregorii will slightly increase in the 2070s, indicating that climate change may have little effect on its distribution. The precipitation of the warmest quarter (bio_18) is the most important climatic factor, with an optimum range of 487.3–799.8 mm. Our work could help make scientific strategies for in situ and ex situ conservation of P. macgregorii.
Abstract—The phylogenetic relationships among 11 out of the 12 genera of the angiosperm family Styracaceae have been largely resolved with DNA sequence data based on all protein-coding genes of the plastome. The only genus that has not been phylogenomically investigated
in the family with molecular data is the monotypic genus Parastyrax, which is extremely rare in the wild and difficult to collect. To complete the sampling of the genera comprising the Styracaceae, examine the plastome composition of Parastyrax, and further explore the phylogenetic
relationships of the entire family, we sequenced the whole plastome of P. lacei and incorporated it into the Styracaceae dataset for phylogenetic analysis. Similar to most others in the family, the plastome is 158189 bp in length and contains a large single-copy region of 88085
bp and a small single-copy region of 18540 bp separated by two inverted-repeat regions of 25781 bp each. A total of 113 genes was predicted, including 79 protein-coding genes, 30 tRNA genes, and four rRNA genes. Phylogenetic relationships among all 12 genera of the family were constructed
with 79 protein-coding genes. Consistent with a previous study, Styrax, Huodendron, and a clade of Alniphyllum + Bruinsmia were successively sister to the remainder of the family. Parastyrax was strongly supported as sister to an internal clade comprising
seven other genera of the family, whereas Halesia and Pterostyrax were both recovered as polyphyletic, as in prior studies. However, when we employed either the whole plastome or the large- or small-single copy regions as datasets, Pterostyrax was resolved as monophyletic
with 100% support, consistent with expectations based on morphology and indicating that non-coding regions of the Styracaceae plastome contain informative phylogenetic signal. Conversely Halesia was still resolved as polyphyletic but with novel strong support.
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