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Seed plants are the most prosperous plant group on Earth and the most important producers
in terrestrial ecosystems.
The terrestrial distribution of different taxa of seed plants varies greatly, such as some species of the Asteraceae genus Senecio, which have a distribution area of tens of millions of square kilometers, while some endemic species of Impatiens in the mountainous regions of southwest China are limited to less than one square kilometer
.
Why is there such a huge variation in the distribution of seed plants? This is one of
the core questions in biogeographic research.
Seeds are the mobile life history stage of plants, and they participate in key ecological processes that restrict distribution, such as diffusion and colonization, and the relationship between the functional traits of seeds and plant distribution areas is worth in-depth discussion
.
Recently, Li Debai's team and Gao Lianming's team from the Kunming Institute of Botany, Chinese Academy of Sciences, collaborated with Professor He Fangliang of the University of Alberta and Professor Kevin S.
Burgess of Columbus State University in the United States, based on 122 families 501 collected by the Southwest China Wildlife Germplasm Resource Bank The functional traits data of 1426 planted species supplemented some seed functional trait data from the British Millennium Seed Bank, combined with the plant distribution information and angiosperm phylogenetic tree relationship obtained by the public database, and explored the relationship between the size of seed plant distribution area and the key functional traits and phylogeny of seeds with the help of analysis methods such as least squares phylogenetic regression and variation decomposition
。 The results showed that there were significant phylogenetic signals in the distribution area size of seed plants.
After excluding phylogenetic signals, the smaller the seeds, the larger the plant distribution area.
The variability of seed size has a certain positive effect on plant distribution, and the interaction between seed size and seed dispersal mode affects the distribution
of plants.
Overall, phylogeny, seed size, variability, and dispersal mode together explained 46.
82% of the species distribution area variation
.
The study provides a new case
for understanding how seed functional traits and phylogeny affect plant distribution size.
The results were published in Biogeosciences, an international journal at the intersection of life sciences and earth sciences, under the title Seed traits and phylogeny explain plants' geographic distribution.
Chen Kai, a graduated doctoral student, is the first author of the paper, and Professor Gao Lianming and Professor Li Debai are the corresponding authors
of the paper.
The research has been supported by the Category B Pilot Project of the Chinese Academy of Sciences (XDB31000000), the International Partnership Program of the Chinese Academy of Sciences (151853KYSB20190027), and the National Natural Science Foundation of China (32160078 ) and supported by the National Major Scientific Research Program (2014CB954100
).
Article link
Figure 1: Effects
of key functional traits of seeds on the size of seed plant distribution areas.
Figure 2: Variation and decomposition
of plant distribution area size by seed size and its variability, dispersal mode and phylogeny.
