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首页> 美国卫生研究院文献>Ecology and Evolution >Cytonuclear discordance in the Florida Everglades invasive Burmese python (Python bivittatus) population reveals possible hybridization with the Indian python (P. molurus)
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Cytonuclear discordance in the Florida Everglades invasive Burmese python (Python bivittatus) population reveals possible hybridization with the Indian python (P. molurus)

机译：佛罗里达大沼泽地入侵缅甸蟒（Python bivittatus）种群的细胞核不和谐揭示了可能与印度蟒（P.molurus）杂交

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The invasive Burmese python (Python bivittatus) has been reproducing in the Florida Everglades since the 1980s. These giant constrictor snakes have caused a precipitous decline in small mammal populations in southern Florida following escapes or releases from the commercial pet trade. To better understand the invasion pathway and genetic composition of the population, two mitochondrial (mtDNA) loci across 1,398 base pairs were sequenced on 426 snakes and 22 microsatellites were assessed on 389 snakes. Concatenated mtDNA sequences produced six haplotypes with an average nucleotide and haplotype diversity of π = 0.002 and h = 0.097, respectively. Samples collected in Florida from morphologically identified P. bivittatus snakes were similar to published cytochrome oxidase 1 and cytochrome b sequences from both P. bivittatus and Python molurus and were highly divergent (genetic distances of 5.4% and 4.3%, respectively). The average number of microsatellite alleles and expected heterozygosity were N A = 5.50 and H E = 0.60, respectively. Nuclear Bayesian assignment tests supported two genetically distinct groups and an admixed group, not geographically differentiated. The effective population size (N E = 315.1) was lower than expected for a population this large, but reflected the low genetic diversity overall. The patterns of genetic diversity between mtDNA and microsatellites were disparate, indicating nuclear introgression of separate mtDNA lineages corresponding to cytonuclear discordance. The introgression likely occurred prior to the invasion, but genetic information on the native range and commercial trade is needed for verification. Our finding that the Florida python population is comprised of distinct lineages suggests greater standing variation for adaptation and the potential for broader areas of suitable habitat in the invaded range.
机译：自1980年代以来，入侵性缅甸巨蟒（Python bivittatus）一直在佛罗里达大沼泽地繁殖。由于商业宠物贸易的逃逸或释放，这些巨型con蛇在佛罗里达州南部导致小型哺乳动物种群的急剧减少。为了更好地了解种群的入侵途径和遗传组成，在426条蛇上对跨越1,398个碱基对的两个线粒体（mtDNA）基因座进行了测序，并在389条蛇上评估了22个微卫星。串联的mtDNA序列产生了六种单倍型，其平均核苷酸和单倍型多样性分别为π= 0.002和h = 0.097。在佛罗里达州从形态鉴定出的P. bivittatus蛇收集的样品与P.bivittatus和Python molurus的已发表的细胞色素氧化酶1和细胞色素b序列相似，并且高度不同（遗传距离分别为5.4％和4.3％）。微卫星等位基因的平均数目和预期的杂合度分别为N A = 5.50和H E = 0.60。核贝叶斯赋值测试支持两个遗传上不同的组和一个混合组，没有地理上的区别。有效人口规模（NE = 315.1）低于预期的人口规模，但反映出总体遗传多样性较低。 mtDNA和微卫星之间的遗传多样性模式是完全不同的，表明对应于细胞核不和谐的单独mtDNA谱系的核渗入。渗入可能发生在入侵之前，但是需要有关本地范围和商业交易的遗传信息进行验证。我们的发现表明，佛罗里达的蟒蛇种群由不同的血统组成，这表明适应性的站立差异更大，并且有可能在入侵范围内扩大合适栖息地的范围。

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