Aim: To date, few studies have examined the phylogenetics of Corbicula clams in their native range and the environmental parameters influencing their distribution, although this could provide great insights into the biological adaptation and invasion dynamics of Corbicula clams. We sought to identify the genetic lineages of native Corbicula clams and elucidate the environmental factors shaping the distributions of identified lineages. Location: China, mainly the Yangtze River Basin. Methods: The alignment comprised 558 COI sequences including samples from China and 222 COI sequences from published studies. This dataset was used to generate phylogenetic trees and compare population diversity. We used dbRDA method to assess the relationship between these COI data and environmental factors measured to identify the important factors affecting Corbicula's distribution. Results: The COI phylogenetic tree delineated the monophyly of 3 major COI clades and 77 distinct COI haplotypes in the Yangtze River Basin. The invasive lineage C/S (FW17) was not identified in our sampling in China, while invasive lineages A/R (FW5 = Hap6), B (FW1 = Hap17) and Rlc (FW4 = Hap43) were identified, abundant and widely distributed in the middle and lower reaches of Yangtze River. Focusing on populations from Yangtze River Basin, both the COI haplotype and nucleotide diversity in the lakes along the Yangtze River increased with longitude, except for the river mouth population. The AMOVA tests showed significant differentiation between the middle and lower reaches of the Yangtze River and among populations. The dbRDA results suggested that the parameter chloride explained most of the spatial COI haplotype distribution variation in the Yangtze River Basin, with the three invasive lineages tolerating broad fluctuations of salinity (chloride levels ranging from 4 to 60 mg/L). Conclusions: The Corbicula COI haplotypes found within the Yangtze River Basin had distinct distribution preferences, with the invasive androgenetic lineages being the | 365 ZENG et al.

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The global invasion of the genus Corbicula has caused serious ecological and economic problems. The species of Corbicula fluminea stands out amongst the greater part of freshwater invaders around the world. Here, we sequenced the entire mitogenome of the Corbicula fluminea, which were gathered from Dongting Lake, in the Hunan province of central China. The circular genome is 17,073 bp long. The raw reads were obtained from the platform of Illumina HiSeq 2500, and assembled by the MITObim method followed by alignments to related species. The entire dataset was deposited at the NCBI Short Read Archive via accession number SRR14692229 and NCBI GenBank with accession number MZ231034.1.