Abstract
Predicting potential hybridization between native and non-native Rhodeus ocellatus subspecies: the implications for conservation of a pure native population in northern Kyushu, Japan
Highlights
The introduction and establishment of non-native species have negative effects on individuals, populations, and communities of native species, and introduced species have contributed to the decline or extinction of native species worldwide (Coblentz 1990; Lodge 1993; Townsend 2003)
We predicted the distributions of Rok and Roo in northern Kyushu by using models with high accuracy and landscape parameters as explanatory variables in our previous study (Onikura et al 2012), which indicated that the overlapping areas of distribution of the two subspecies were in limited areas that contained the habitat
We used previously derived genetic data for Rok and Roo in 68 sites (Miyake et al 2008), and these specimens have been preserved in the Kyushu University Museum (KYUM-PI00002235–00002314). These data were based on mitochondrial DNA analysis of 10 to 20 individuals per site, and we indicated the ratio of Roo haplotypes (Roo-GI) in each site in the previous study (Miyake et al 2008)
Summary
The introduction and establishment of non-native species have negative effects on individuals, populations, and communities of native species, and introduced species have contributed to the decline or extinction of native species worldwide (Coblentz 1990; Lodge 1993; Townsend 2003). In terms of legislation and regulation little attention has been paid to the severity of ecological impact from hybridization despite the fact that hybridization can cause extinction of a species, subspecies, or population by genetic extermination with genetic introgression (Rhymer and Simberloff 1996; Allendorf et al 2001; Sato et al 2010a). We can classify the hybridizations of freshwater fishes in Japan into three levels: interspecific, intersubspecific, and intraspecific hybridization. Several alien species, subspecies and populations, including Roo and P. parva, are classified as "invasive with high risk" (Onikura et al 2011), by the Fish Invasiveness Scoring Kit (Copp et al 2005)
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