Evolution of mosaic hybrid zone between invasive and endemic species of Cyprinidae through space and time

Costedoat, Caroline; Lévy, Nicolas; Salducci, Marie‐Dominique; Chappaz, Rémi; Gilles, André

doi:10.1111/j.1095-8312.2005.00478.x

Cited by 43 publications

(55 citation statements)

References 52 publications

(56 reference statements)

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“…wasmanni specimens (cf. Costedoat et al 2005). The classification result from using D(2) for the 114 workers hypothesised to represent the parental species was in line with the a-priori hypothesis for all specimens.…”

Section: Cssupporting

confidence: 76%

Mixed colonies and hybridisation of Messor harvester ant species (Hymenoptera: Formicidae)

et al. 2011

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The Mediterranean harvester ant species Messor minor, M. cf. wasmanni, and M. capitatus can co-occur in the same habitat. In Italian populations, we encountered colonies that contained workers from more than one species as identified via standard morphology, as well as colonies with workers that appeared to be morphologically intermediate between species. This unusual finding required further analysis. We analysed such colonies using microsatellites, mitochondrial DNA and refined morphometrics, and a simple inference key for the colony-level interpretation of data from the three sources combined. We infer that Messor minor and M. cf. wasmanni engage in bidirectional interspecific gene flow. Hybrids between these two species are inferred to produce fertile offspring, which would indicate that barriers to hybridisation do not exist or can be completely overcome. This is unexpected, given that they are non-sister species and broadly sympatric in nature. Our findings also indicate the possible occurrence of hybrid-hybrid crosses, a phenomenon rarely observed in ants. We cautiously interpret the data at hand as in support of the interspecific gene flow considerably shaping the genetic makeup of populations, raising the question about a potential adaptive value of this hybridisation. Messor capitatus mixes with hybrids of the other two species, but we found no indication of hybridisation involving this species. We discuss various hypotheses on the causations of colony mixing and hybridisation in the three Messor species at the proximate and ultimate level.

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Section: Cssupporting

confidence: 76%

Mixed colonies and hybridisation of Messor harvester ant species (Hymenoptera: Formicidae)

et al. 2011

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“…A 610 bp fragment of the cytochrome b mtDNA sequence was amplified using primers and an amplification protocol described elsewhere [10]. The single strand was used as a template for the sequencing of 532 bp with an automated DNA sequencer (Macrogen Inc.) (Genbank accession number EF363338-EF363452).…”

Section: Methodsmentioning

confidence: 99%

“…We analyzed interactions between the various qualitative variables, using chi-square tests or log-linear models [10]. For quantitative variables (coefficient of condition and morphology), interactions were analyzed by variance-based methods—ANOVA and MANCOVA, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…This colonization has made hybridization between these two species possible, particularly in the Rhone Basin. In previous studies [9], [10], we reported bidirectional introgression between the two Chondrostoma species in the River Durance. The structuring of the hybrid zone was strongly linked to progressive urbanization and an increase in human activities along this river, with the construction of various dams preventing fish from swimming upstream or downstream.…”

Section: Introductionmentioning

confidence: 91%

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Novelties in Hybrid Zones: Crossroads between Population Genomic and Ecological Approaches

Costedoat¹,

Lévy²,

Chappaz³

et al. 2007

PLoS ONE

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BackgroundInterspecific hybridization is widespread, occurring in a taxonomically diverse array of species. The Cyprinidae family, which displays more than 30% hybridization, is a good candidate for studies of processes underlying isolation and speciation, such as genetic exchange between previously isolated lineages. This is particularly relevant in the case of recent hybridization between an invasive species, Chondrostoma nasus nasus (from Eastern Europe), and C. toxostoma toxostoma (a threatened species endemic to southern France), in which bidirectional introgressive hybridization has been demonstrated.Methodology/Principal FindingsWe studied 128 specimens from reference populations and 1495 hybrid zone specimens (two years of sampling and four stations), using five molecular markers (one mitochondrial gene, four nuclear introns), morphology (meristic and plastic characters) and life history traits (weight, size, coefficient of condition, sex, age, shoaling). We identified 65 hybrid combinations and visualized spatial and temporal changes in composition. The direction of mitochondrial introgression was density-dependent in favor of the rarer species and we demonstrate that the sexual selection hypothesis is a preponderant explanation in the asymmetry of introgression. Despite genomic evolution in the hybrid zone, convergence was observed for body shape and coefficient of condition, indicating changes in foraging behavior with respect to reference populations, reflecting strong environmental pressure.Conclusions/SignificanceThe complex rules of hybrid zone dynamics are established very early in the contact zone. We propose “inheritance from the rare species” as a new evolutionary hypothesis for animal models. The endemic species was not assimilated by the invasive species. Survival rates for this species were highest in the middle of the river (the warmest part) due to a trade-off between food availability and fecundity. The environment-independent hybrid combination may result from nuclear-mitochondrial interactions involving the Tpi1b gene or a gene linked to this gene (Chromosome 16). This genomic region is also responsible for shoaling behavior in Danio rerio and is a promising zone for studies of changes in population dynamics and advances in integrated studies of hybrid zones.

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“…Hybridization is well known from cases where fish species have been introduced to habitats containing native congeners, with prominent examples from salmonids (Allendorf et al 2004), cyprinids (Costedoat et al 2005) and cyprinodontids (Rosenfield et al 2004). However, there is also concern that human-mediated disturbance of aquatic habitats can lead to hybridization among naturally occurring species pairs.…”

Section: Introductionmentioning

confidence: 99%

Genetic monitoring of two decades of hybridization between allis shad (Alosa alosa) and twaite shad (Alosa fallax)

Jolly

Maitland²,

Genner

2011

Conserv Genet

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Habitat alteration has been implicated in driving hybridization between the sympatric migratory shads Alosa alosa and Alosa fallax. Morphological and molecular evidence is consistent with hybridization across the overlapping range of these species, but the temporal extent of hybrid occurrence and genetic consequences for populations have not been explored. Using eight nuclear microsatellite loci and samples collected between 1989 and 2008 in the Solway Firth (UK), we genetically identified hybrids, studied temporal changes in their frequency, and explored changes in allele frequencies of parental populations. These molecular data confirmed the hybrid status of individuals identified using morphology (number of rakers on the outer gill arch), and enabled separation of hybrids from purebred individuals. Mitochondrial cytochrome-b sequencing revealed the presence of two haplogroups, each predominantly occurring in one species. Heterospecific haplotypes were found in 22.3 and 12.8% of A. alosa and A. fallax individuals, respectively, consistent with backcrossing and suggesting that hybrids are fertile. On average, microsatellite-identified hybrids comprised 12.7% of all samples, but when individuals with cytonuclear discordance were also considered introgressed on average 25.4% of individuals were of hybrid ancestry. Overall, allelic richness remained largely unchanged within species, but there were declines in the inbreeding coefficient (F IS ) of both species and episodes of significant temporal allelic frequency change. Hybrids sampled between 2004 and 2008 showed no evidence of lower fecundity relative to purebred individuals. Together, results suggest that hybridization between shad species in northern Europe is prevalent, and has been ongoing over at least two decades. The challenge is now to understand the extent to which observed patterns are linked to immigration from other populations, and the mechanisms that have prevented species collapse despite apparent hybrid fertility and longstanding introgression of neutral markers.

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Evolution of mosaic hybrid zone between invasive and endemic species of Cyprinidae through space and time

Cited by 43 publications

References 52 publications

Mixed colonies and hybridisation of Messor harvester ant species (Hymenoptera: Formicidae)

Mixed colonies and hybridisation of Messor harvester ant species (Hymenoptera: Formicidae)

Novelties in Hybrid Zones: Crossroads between Population Genomic and Ecological Approaches

Genetic monitoring of two decades of hybridization between allis shad (Alosa alosa) and twaite shad (Alosa fallax)

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