Distrib. Front. Davis, M. A. Tamura, K., Stecher, G., Peterson, D., Filipski, A., Kumar, S. (2013). An invasive variety of Phragmites australis (Poaceae, common reed), the M haplotype, has been implicated in the spread of this species into North American salt marshes that are normally dominated by the salt marsh grass Spartina alterniflora (Poaceae, smooth cordgrass). All names of the haplotypes obtained in this study were assigned according to the method of Blum et al. S. anglica is a fertile polyploid derived from the hybrid S.alterniflora × townsendii (S. alterniflora × S. maritima), first found when American S. alterniflora was introduced to southern England in about 1870 and came into contact with the local native S. maritima. Invasion of the non-indigenous nuisance mussel, Limnoperna fortunei, into water supply facilities in Japan. The significant excessive homozygosity on Japanese S. alterniflora populations was observed in the infinite allele mutation model (IAM), the stepwise mutation model (SMM), and the two-phased model of mutation (TPM) (P<0.05). To evaluate the genetic structure in the individuals, analysis with STRUCTURE allocated all individuals to K clusters by Bayesian’s clustering and was conducted to maximize the linkage disequilibrium and Hardy-Weinberg’s disequilibrium. YM, MT, and DH designed and coordinated the research. doi: 10.2307/3298527. doi: 10.1007/s10531-005-2575-5, Zhou, H.-X., Liu, J.-E., Qin, P. (2009). Tamaoki, M., Takizaki, Y. (2019). Mol. This invasive species can be identified by looking for the characteristics described in the paragraphs that follow. J. Integr. To compare the chloroplast DNA (cpDNA) haplotypes of S. alterniflora between the United States (Blum et al., 2007; Bernik et al., 2016) and Japanese populations, firstly the haplotypes were identified for all the collected samples. (cordgrass) (Bortolus et al., 2019) greatly alter brackish and estuarine salt marsh environments via changes in the sediment properties of the tidal flats with growth, resulting in its subsequent further population expansion (e.g., Howes and Teal, 1994; Neira et al., 2005). The forward primer was fluorescently labeled with 5′-FAM, TAMRA, and 5′-JOE. The plant also expands via underground rhizomes. Invasive Plant Sci. In addition, the genetic characterization of a population is largely associated with the ability of distribution expansion (Lee, 2002). Smooth cordgrass was introduced on the West Coast in the early 1970s to be used as erosion control. (New York, NY: Wiley & Sons), 255–289. Symbols are as follows: rhomboid, populations in Umeda River (Aichi); square, in Oono River (southern Kumamoto); triangle, in Shirakawa River (northern Kumamoto); cross, in Tsuboi River (northern Kumamoto). Lowe, S., Browne, M., Boudjelas, S. (2000). These data suggest that the route through which invasive S. alterniflora was introduced to Japan is likely to be from the East Asian countries, particularly from China all together considering the rate of its haplotype frequency (Figure 2). Therefore, these facts indicate that the founder effect might have occurred in S. alterniflora populations in Japan. 9 (4), 443–455. (B) The assignment of each individual into the clusters using STRUCTURE analysis. Chinese mangrove ecosystems are vulnerable to the invasive species Spartina alterni-flora (a perennial herb), which is native to North America and was introduced to China in 1979 to accelerate the deposition and stabilization of tidal flats [12]. (2007). 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