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21 results for “Invasion routes”
Figure 1 in Gene Flow Patterns of the Aedes aegypti (Diptera: Culicidae) Mosquito in Colombia: a Continental Comparison Suggests Multiple Invasion Routes and Gene Exchange
Figure 1 Geographic location of the A. aegypti populations included in this study and gene-flow models evaluated. In both graphics, circles indicate the populations and arrows represent the gene flow between populations. A) Scale at American continent level (N = 2,996 specimens from six locations: Mexico – North America (M-NA), Venezuela (VZ), Peru (PE), Brazilian Amazon (BrAm), southeastern Brazil (SEBr), and Colombia (CO). B) Scale at South America level (N = 1,083 specimens from six locations: Venezuela, Peru, Brazilian Amazon (5 locations; Brazilian Amazon (BrAM), Manaus (MAO), Belém (BL). Boa Vista (BV), Rio Branco (RB), Porto Velho (PV)), Southeastern Brazil (SEBr) and Colombia (2 locations; Sucre (S), Quindio (Q)).
Figure 4. Phylogeny constructed through Bayesian inference estimated from the 35H in Gene Flow Patterns of the Aedes aegypti (Diptera: Culicidae) Mosquito in Colombia: a Continental Comparison Suggests Multiple Invasion Routes and Gene Exchange
Figure 4. Phylogeny constructed through Bayesian inference estimated from the 35H found of the ND4 gene for the A. aegypti populations in the American continent. The blue horizontal bars above the branches reflect the 95% CI for the branch supports. The color bars (blue, green, and red) on the tree terminals indicate which haplotypes are exclusive for a specific population. The dotted lines on the right side of the tree and numbers I or II indicate to what clade each of the terminals belong. H1-Col (Colombia (Sucre and Quindio), Venezuela, Peru, M-NA, Brasil (MA-O, RBPV, SEBr, BE-L)), H4 (Venezuela, M-NA, Brasil (MA-O, RBPV, BEL)), H3 (Venezuela, M-NA, Brazil (RBPV, SEBr, BE-L)), H2-Col (Colombia (Sucre), Venezuela, Peru, M-NA, Brazil (RBPV, SEBr, BE-L)), H13 (M-NA, Brazil (SEBr)), H8 (Venezuela, Brazil (SEBr)).
Figure 3 in Gene Flow Patterns of the Aedes aegypti (Diptera: Culicidae) Mosquito in Colombia: a Continental Comparison Suggests Multiple Invasion Routes and Gene Exchange
Figure 3. Representation of the gene-flow model with greater subsequent probability in the scenarios of the Americas and South America.A. Scale at American continent level (N = 2,996 specimens from six locations: Mexico–North America, Venezuela, Peru, Brazilian Amazon, southeastern Brazil, and Colombia. Within the continent context, the Stepping Stone 1 model shows through the green vectors the way the gene flow occurs among the different populations evaluated. B. Scale at South America level; the Full-migration model indicates migration among all the populations, hence, plotting of the potential migration routes through passive land transport (Pan-American highway) and riverine paths (principal rivers).
Identification of non-native populations and reconstruction of invasion routes in the Redbreast Sunfish Lepomis auritus
<p>Human-mediated introductions of non-native species are expected to increase globally and threaten native biodiversity. <em>Lepomis auritus</em> (Redbreast Sunfish), a carnivorous freshwater fish native to rivers in eastern North America, has been introduced far outside of its native range due to its popularity in recreational fisheries. However, poor documentation of introductions and lack of thorough ichthyofaunal surveys before the mid-20th century have complicated our understanding of the establishment and spread of non-native <em>L. auritus</em> over the past 90 years, precluding effective management. We conducted phylogenomic analyses using ddRAD data from 197 specimens of <em>L. auritus</em> collected throughout the known geographic range of the species to reconstruct the introduction history of the species. Our protocols allow for the reconstruction of complicated introduction routes and reveal that <em>L. auritus</em> in Texas is the result of a single-source introduction from the Suwannee River; the population in the upper Tennessee River has two sources of introduction from the Savannah River and the northeastern rivers that drain into the Atlantic Ocean; and the populations in the middle Tennessee River and the Mobile River Basin have sources from the upper Tennessee River system and the Apalachicola River Basin. Ecological and evolutionary investigations of the non-native populations of <em>L. auritus</em> will broaden the understanding of invasion dynamics in species of <em>Lepomis</em> and other non-native freshwater fishes in North America. Our study provides critical information for the conservation of native populations and invasive management of non-native populations of <em>L. auritus</em>.</p>
Identification of non-native populations and reconstruction of invasion routes in the Redbreast Sunfish Lepomis auritus
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State of the spread of the exotic parasitoid wasp <em>Leptopilina japonica</em> tracking the route of its invasive host fly <em>Drosophila suzukii</em> in France
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Data from: Complementarity of statistical treatments to reconstruct worldwide routes of invasion: the case of the Asian ladybird Harmonia axyridis
Inferences about introduction histories of invasive species remain challenging because of the stochastic demographic processes involved. Approximate Bayesian computation (ABC) can help to overcome these problems, but such method requires a prior understanding of population structure over the study area, necessitating the use of alternative methods and an intense sampling design. In this study, we made inferences about the worldwide invasion history of the ladybird Harmonia axyridis by various population genetics statistical methods, using a large set of sampling sites distributed over most of the species' native and invaded areas. We evaluated the complementarity of the statistical methods and the consequences of using different sets of site samples for ABC inferences. We found that the H. axyridis invasion has involved two bridgehead invasive populations in North America, which have served as the source populations for at least six independent introductions into other continents. We also identified several situations of genetic admixture between differentiated sources. Our results highlight the importance of coupling ABC methods with more traditional statistical approaches. We found that the choice of site samples could affect the conclusions of ABC analyses comparing possible scenarios. Approaches involving independent ABC analyses on several sample sets constitute a sensible solution, complementary to standard quality controls based on the analysis of pseudo-observed datasets, to minimize erroneous conclusions. This study provides biologists without expertise in this area with detailed methodological and conceptual guidelines for making inferences about invasion routes when dealing with a large number of sampling sites and complex population genetic structures.
Data from: The evolution of chemical defenses along invasion routes: Harmonia axyridis Pallas (Coccinellidae: Coleoptera) as a case study
The Evolution of Increased Competitive Ability (EICA) hypothesis (Blossey & Nötzold, 1995) postulates that escaping from coevolved enemies increases invaders fitness by energy reallocation from defenses and immunity to growth and reproduction. In this context, we evaluated the evidence of evolutionary change in invasive populations of Harmonia axyridis Pallas (Coccinellidae: Coleoptera). We measured egg defenses – cocktail of hydrocarbons on the egg's surface flagging egg toxicity, and the concentration of the main alkaloid harmonine - in individuals from three populations along the invasion route (Japan: native, USA: introduced more than 30 years ago, South Africa: introduced in the early 2000s) in a common garden experiment. Our results support the EICA hypothesis: we found changes along the invasion route in the profiles of the hydrocarbons coating the eggs' surface, and a decrease in the concentration of harmonine in eggs from the most recent invasive South African population compared to the long established in the USA and the native Japanese ones.
Trade-off between dispersal traits in a heterocarpic plant across its invasion route
<p>Dispersal ability can vary across plant species or populations, such as among core compared to leading populations of invasive plants. However, in heterocarpic plants, which produce propagules with varying dispersal abilities, dispersal potential can also increase via investment in the proportion of dispersing morphs (termed dispersal rate). Nevertheless, very little is known about the interplay between investment in dispersing structures vs. dispersal rate or how each is affected by varying environmental pressures.</p> <p><strong><em>Methods</em></strong></p> <p>This study examined the interplay between investment in dispersing structures and dispersal rate across the invasion route of the heterocarpic plant <em>Heterotheca subaxillaris</em>. <em>H. subaxillaris</em>'s capitula were collected from eight populations along its invasion route in the Eastern Mediterranean coastal plain. The dispersal ability of dispersing pappus-bearing achenes was measured as the ratio between their pappus width and biomass. The dispersal rate was calculated as the ratio between the number of dispersing achenes and total achenes per capitulum. </p> <p><em><strong>Key Results </strong></em></p> <p>The dispersal ability of the dispersing achenes and dispersal rate were found to be negatively correlated across <em>H. subaxillaris</em>' populations, with a greater investment in pappus length in populations at the leading edge of the invasion compared to a greater number of dispersing achenes in core populations.</p> <p><em><strong>Conclusions</strong></em> </p> <p>Our results suggest a trade-off might exist between dispersal ability and dispersal rate, which could change along the invasion route of heterocarpic plants such as <em>H. subaxillaris</em> and contribute to their invasive success. This study highlights the importance of examining both dispersal traits when studying the dispersal potential of heterocarpic species. </p>
Vascular Access for Minimally-invasive Leadless Pacemaker Implantation Through the Right Jugular routE
ClinicalTrials.gov study NCT06455566. IPD Sharing: NO. Countries: 1. Publications: 3.
Data from: Global invasion history of the Tropical Fire Ant: a stowaway on the first global trade routes
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Data from: Complementarity of statistical treatments to reconstruct worldwide routes of invasion: the case of the Asian ladybird Harmonia axyridis
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Data from: The evolution of chemical defenses along invasion routes: Harmonia axyridis Pallas (Coccinellidae: Coleoptera) as a case study
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Trade-off between dispersal traits in a heterocarpic plant across its invasion route
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Data from: Testing for multiple invasion routes and source populations for the invasive brown treesnake (Boiga irregularis) on Guam: implications for pest management
The brown treesnake (Boiga irregularis) population on the Pacific island of Guam has reached iconic status as one of the most destructive invasive species of modern times, yet no published works have used genetic data to identify a source population. We used DNA sequence data from multiple genetic markers and coalescent-based phylogenetic methods to place the Guam population within the broader phylogeographic context of B. irregularis across its native range and tested whether patterns of genetic variation on the island are consistent with one or multiple introductions from different source populations. We also modeled a series of demographic scenarios that differed in the effective size and duration of a population bottleneck immediately following the invasion on Guam, and measured the fit of these simulations to the observed data using approximate Bayesian computation. Our results exclude the possibility of serial introductions from different source populations, and instead verify a single origin from the Admiralty Archipelago off the north coast of Papua New Guinea. This finding is consistent with the hypothesis that B. irregularis was accidentally transported to Guam during military relocation efforts at the end of World War II. Demographic model comparisons suggest that multiple snakes were transported to Guam from the source locality, but that fewer than 10 individuals could be responsible for establishing the population. Our results also provide evidence that low genetic diversity stemming from the founder event has not been a hindrance to the ecological success of B. irregularis on Guam, and at the same time offers a unique 'genetic opening' to manage snake density using classical biological approaches.
Figure 2 in Gene Flow Patterns of the Aedes aegypti (Diptera: Culicidae) Mosquito in Colombia: a Continental Comparison Suggests Multiple Invasion Routes and Gene Exchange
Figure 2. Haplotype network for the mitochondrial ND4 gene from natural A. aegypti populations from: A. American continent, including sequences for Colombia; B. Colombia. In both haplotype networks, the size of each circle is proportional with the haplotypic frequency. The number next to each circle indicates the haplotype number.
Data from: Retracing the routes of introduction of invasive species: the case of the Sirex noctilio woodwasp.
Understanding the evolutionary histories of invasive species is critical to adopt appropriate management strategies, but this process can be exceedingly complex to unravel. As illustrated in this study of the worldwide invasion of the woodwasp Sirex noctilio, population genetic analyses using coalescent-based scenario testing together with Bayesian clustering and historical records provide opportunities to address this problem. The pest spread from its native Eurasian range to the Southern Hemisphere in the 1900's and recently to Northern America, where it poses economic and potentially ecological threats to planted and native Pinus spp. To investigate the origins and pathways of invasion, samples from five continents were analysed using microsatellites and sequence data. Surprisingly, clustering analyses revealed two gene pools. Scenario testing showed independent introductions from an unsampled source, putative source of the second gene pool. The invasion history was much more complex than previously believed, with most of the populations being admixtures resulting from independent introductions from Europe and subsequent spread among the invaded areas. Results also shed light on the micro-evolutionary processes occurring during introductions, and showed that only few specimens gave rise to some of the populations. Analyses of microsatellites using clustering and scenario testing considered against historical data drastically altered our understanding of the invasion history of S. noctilio and will have important implications for the strategies employed to fight its spread. This study illustrates the value of combining clustering and ABC methods in a comprehensive framework to dissect the complex patterns of spread of global invaders.
Data from: Retracing the routes of introduction of invasive species: the case of the Sirex noctilio woodwasp.
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Data from: Testing for multiple invasion routes and source populations for the invasive brown treesnake (Boiga irregularis) on Guam: implications for pest management
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Comparison of transcriptomic profiles in natural populations of rodents (house mouse and black rat) along invasion routes in Senegal
GEO Series GSE112890. Rattus rattus; Mus musculus. 32 samples. Type: Expression profiling by high throughput sequencing.
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