首页|Eco-evolutionary evidence for the global diversity pattern of Cycas(Cycadaceae)

Eco-evolutionary evidence for the global diversity pattern of Cycas(Cycadaceae)

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The evolution of the latitudinal diversity gra-dient(LDG),characterized by a peak in diver-sity toward the tropics,has captured significant attention in evolutionary biology and ecology.However,the inverse LDG(i-LDG)mechanism,wherein species richness increases toward the poles,remains inadequately explored.Cy-cads are among one of the oldest lineages of extant seed plants and have undergone ex-tensive diversification in the tropics.Intrigu-ingly,the extant cycad abundance exhibits an i-LDG pattern,and the underlying causes for this phenomenon remain largely elusive.Here,using 1,843 nuclear genes from a nearly com-plete sampling,we conducted comprehensive phylogenomic analyses to establish a robust species-level phylogeny for Cycas,the largest genus within cycads.We then reconstructed the spatial-temporal dynamics and integra-ted global environmental data to evaluate the roles of species ages,diversification rates,contemporary environment,and conserva-tism to ancestral niches in shaping the i-LDG pattern.We found Cycas experienced de-creased diversification rates,coupled with the cooling temperature since its origin in the Eocene from continental Asia.Different regions have distinctively contributed to the forma-tion of i-LDG for Cycas,with the northern hemisphere acting as evolutionary museums and the southern hemisphere serving as cra-dles.Moreover,water-related climate variables,specifically precipitation seasonality and po-tential evapotranspiration,were identified as paramount factors constraining Cycas species richness in the rainforest biome near the equator.Notably,the adherence to ancestral monsoonal climates emerges as a critical factor in sustaining the diversity pattern.This study underscores the imperative of integrating both evolutionary and ecological approaches to comprehensively unravel the mechanisms un-derpinning global biodiversity patterns.

cycadslatitudinal diversity gradientniche con-servatismspatiotemporal diversificationspecies richness

Jian Liu、Anders J.Lindstrom、Yiqing Gong、Shanshan Dong、Yusheng(Chris)Liu、Shouzhou Zhang、Xun Gong

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CAS Key Laboratory for Plant Diversity and Biogeography of East Asia,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China

Department of Economic Plants and Biotechnology,Yunnan Key Laboratory for Wild Plant Resources,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China

University of Chinese Academy of Sciences,Beijing 100049,China

Global Biodiversity Conservancy,144/124 Moo3,Soi Bua Thong,Bangsalae,Sattahip,Chonburi 20250,Thailand

Key Laboratory of Southern Subtropical Plant Diversity,Fairy Lake Botanical Garden,Shenzhen & Chinese Academy of Sciences,Shenzhen 518004,China

Department of Earth and Environmental Sciences,Indiana University-Indianapolis,Indianapolis,IN 46202,USA

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaScientific Foundation of Urban Management Bureau of ShenzhenScientific Foundation of Urban Management Bureau of ShenzhenYouth Innovation Promotion Association CAS,ChinaYunnan Fundamental Research ProjectsYunnan Fundamental Research Projects

32270246319001842020192022082023410202001AT0700722019FD057

2024

10.1111/jipb.13638

植物学报(英文版)
中国植物学会

植物学报(英文版)

CSTPCD
影响因子：0.921
ISSN：1672-9072
年,卷(期)：2024.66(6)