文献类型： 外文期刊

作者： Zhang, Xiaomei ¹ ; Yu, Lei ² ; Li, Yu-Long ¹ ; Suonan, Zhaxi ⁵ ; Komatsu, Teruhisa ⁶ ; Qiu, Guanglong ⁷ ; Xu, Shaochun ¹ ; Yue, Shidong ¹ ; Xu, Min ⁹ ; Wang, Feng ¹⁰ ; Zhang, Yu ¹ ; Lee, Kun-Seop ⁵ ; Liu, Jin-Xian ¹ ; Zhou, Yi ¹ ; Reusch, Thorsten B. H. ² ;

作者机构： 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China

2.GEOMAR Helmholtz Ctr Ocean Res Kiel, Marine Evolutionary Ecol, Wischhofstr 1-3, D-24148 Kiel, Germany

3.Qingdao Marine Sci & Technol Ctr, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China

4.Minist Nat Resources, Field Sci Observat & Res Stn Yellow Bohai Sea Temp, Qingdao 266003, Peoples R China

5.Pusan Natl Univ, Dept Biol Sci, Pusan 46241, South Korea

6.Japan Fisheries Resource Conservat Assoc, Shintomicho Bldg,3-10-9 Irifune,Chuo Ku, Tokyo 1040042, Japan

7.Guangxi Acad Sci, Guangxi Acad Marine Sci, Guangxi Mangrove Res Ctr, Guangxi Key Lab Mangrove Conservat & Utilizat, Beihai 536000, Peoples R China

8.Minist Nat Resources, Observat & Res Stn Coastal Wetland Ecosyst Beibu G, Beihai 536015, Peoples R China

9.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China

10.Hiroshima Univ, Environm Res & Management Ctr, 1-5-3 Kagamiyama, Higashihiroshima, Hiroshima 7398513, Japan

11.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词： chromosomal inversion; cryptic species; hybridization; Nanozostera japonica; seagrasses; secondary contact; triploidy

期刊名称：NEW PHYTOLOGIST （ 影响因子：8.1； 五年影响因子：10.3 ）

ISSN： 0028-646X

年卷期： 2025 年 247 卷 5 期

页码：

收录情况： SCI

摘要： The importance of marine angiosperms, or seagrasses, as foundation species for marine coastal ecosystems is in marked contrast to their low species number of only 70 described taxa. Seagrass species tend to have very similar overall morphologies dictated by hydrodynamic forces of the ocean environment. Moreover, they have inconspicuous and simple flowers, probably due to the absence of flower-pollinator interactions in the sea. We hypothesized that the seagrass species Nanozostera japonica, distributed from tropical to temperate latitudes in the North-Western Pacific, contains cryptic species. To test this, we assembled two chromosome-level reference genomes and conducted whole-genome resequencing at 17 locations throughout its native distribution. We identified two genetically divergent clades in the north and south of its range (hereafter Nj_N and Nj_S) that diverged some 4.16 million years ago. Hybrid individuals at a contact zone were either diploid F1-crosses or featured triploidy, indicating reproductive isolation. A large (42 Mb) reciprocally fixed chromosomal inversion between Nj_N and Nj_S possibly contributed to the formation of the reproductive isolation. We conclude that the N. japonica species complex is actually consisting of two different species. Further population genomic studies may reveal additional cryptic species, solving the conundrum why there are so few described seagrass species today.