Cytonuclear discordance in the Florida Everglades invasive Burmese python (Python bivittatus) population reveals possible hybridization with the Indian python (P. molurus)

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 unde...

Celý popis

Uloženo v:
Podrobná bibliografie
Vydáno v:Ecology and evolution Ročník 8; číslo 17; s. 9034 - 9047
Hlavní autoři: Hunter, Margaret E., Johnson, Nathan A., Smith, Brian J., Davis, Michelle C., Butterfield, John S. S., Snow, Ray W., Hart, Kristen M.
Médium: Journal Article
Jazyk:angličtina
Vydáno: England John Wiley & Sons, Inc 01.09.2018
John Wiley and Sons Inc
Témata:
Base pairs
Bayesian analysis
Cytochrome
Cytochrome b
Cytochromes
Discordance
Genetic distance
Genetic diversity
Haplotypes
Heterozygosity
Hybridization
invasive species
Microsatellites
Mitochondria
Mitochondrial DNA
mitochondrial marker
nuclear microsatellite marker
Nucleotide sequence
Original Research
phylogenetic population structure
Population
Population genetics
Population number
Python bivittatus
Python molurus
Snakes
Florida
United States > US
Everglades
phylogenetic population structure
mitochondrial marker
hybridization
nuclear microsatellite marker
invasive species
ISSN:2045-7758, 2045-7758
On-line přístup:Získat plný text
Tagy: Přidat tag
Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!
Popis
Shrnutí: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 NA = 5.50 and HE = 0.60, respectively. Nuclear Bayesian assignment tests supported two genetically distinct groups and an admixed group, not geographically differentiated. The effective population size (NE = 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. To better understand the genetic diversity of the invasive Burmese python (Python bivittatus) population in Florida, two mitochondrial loci (mtDNA; 1,398 bps) were sequenced on 426 snakes and 22 microsatellites were genotyped on 389 snakes. Nuclear Bayesian assignment tests supported two genetically distinct groups and an admixed group. Patterns for genetic diversity between mtDNA and microsatellites were disparate, indicating cytonuclear discordance corresponding to past breeding of Python molurus and P. bivittatus species.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
content type line 23
ISSN:2045-7758
2045-7758
DOI:10.1002/ece3.4423