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63 results for “Solenopsis invicta”
Fig. 1 in Examining the prevalence of Solenopsis invicta virus 3 (Solinviviridae: Invictavirus) in Solenopsis invicta (Hymenoptera: Formicidae) alates collected in North Florida
Fig. 1. Map of Florida illustrating the collection locations and distribution of Solenopsis invicta virus 3 infection rate of female alates of Solenopsis invicta colonies in urban and rural cities of North Florida. Black portions of the pie charts represent the proportion of alates infected with Solenopsis invicta virus 3.
Fig. 4 in Light affects the homing ability of Solenopsis invicta (Hymenoptera: Formicidae) foraging workers
Fig. 4. The effect of white, blue, yellow, and red light, as well as total darkness (black) on time-to-trail-formation of workers of red imported fire ant, Solenopsis invicta (mean + standard error). Results for time-to-trail-formation in yellow light were significantly faster than for black (dark) and by inference white and blue are also faster than black. Time-to-trail-formation under white light was significantly different from red and by inference white was also faster than black. Red and black time-to-trail-formation results were not significantly different. *P <0.01 and **P <0.001.
Fig. 2 in Light affects the homing ability of Solenopsis invicta (Hymenoptera: Formicidae) foraging workers
Fig. 2. The importance of a fixed light source to foraging red imported fire ants, Solenopsis invicta. Time-to-trail-formation was recorded with a light source that changed sequentially to 1 of 4 symmetrically placed light sources or a single light source that was moved in a circle planar to the colony tray in 90° increments at 1 rpm. Bars represent mean time-to-trail-formation + standard error, ***P <0.0001. By inference, the mean time-to-trail-formation for the single light rotation was longer than the fixed light control.
Fig. 1 in Light affects the homing ability of Solenopsis invicta (Hymenoptera: Formicidae) foraging workers
Fig. 1. Effect of light on the time-to-trail-formation by the red imported fire ant, Solenopsis invicta. The time-to-trail-formation is shown for a single light source in a light sealed room versus the same room with no light. Bars represent mean time-to-trail-formation + standard error, ***P <0.0001.
Fig. 3 in Light affects the homing ability of Solenopsis invicta (Hymenoptera: Formicidae) foraging workers
Fig. 3. The effect of illumination intensity on time-to-trail-formation is shown for workers of red imported fire ant, Solenopsis invicta. The time-to-trail-formation (mean + standard error, N = 6) of the 22 Lux light intensity was significantly shorter than the time-to-trail-formation in the dark. The 3 other light intensities evaluated had lower mean and SE values than the 22 Lux intensity. Therefore, by inference, time-to-trail-formation for light intensities, 312, 140, and 1 Lux were also shorter than the time-to-trail-formation in the dark. ***P <0.0001.
Fig. 1. Cumulative Solenopsis invicta worker ant mortality among Solenopsis invicta virus 3 in Diet with sucrose ameliorates Solenopsis invicta virus 3 (Solinviviridae: Invictavirus) infection in Solenopsis invicta (Hymenoptera: Formicidae) worker ants
Fig. 1. Cumulative Solenopsis invicta worker ant mortality among Solenopsis invicta virus 3-infected and -uninfected colonies provided a diet of crickets (Acheta domesticus) and either supplemented (open symbols) or not supplemented (solid symbols) with a 10% sucrose solution. Analysis of Variance by treatment was conducted for d 21 values and found to be significant (F = 10.0; df = 3,14; P <0.0009). Scheffe's multiple comparison procedure was used to separate the means. Symbols with the same letter are not statistically different.
Fig. 2. Solenopsis invicta virus 3 in Diet with sucrose ameliorates Solenopsis invicta virus 3 (Solinviviridae: Invictavirus) infection in Solenopsis invicta (Hymenoptera: Formicidae) worker ants
Fig. 2. Solenopsis invicta virus 3 genome equivalents per ng RNA from dead Solenopsis invicta worker ants among Solenopsis invicta virus 3-infected and -uninfected colonies provided a diet of crickets (Acheta domesticus) and either supplemented (open symbols) or not supplemented (solid symbols) with a 10% sucrose solution. Solenopsis invicta virus 3 was not detected in the Solenopsis invicta virus 3-uninfected group. Student's t-test was conducted to compare the virus quantity in colonies with and without the sucrose supplement by d. Solenopsis invicta virus 3 genome equivalents per ng RNA was greater significantly in colonies without sugar supplementation on d 12 (t = 2.5; df = 9; P <0.033) and 19 (t = 2.4; df = 9; P <0.037).
Fig. 4 in The good side of the bad guys: predation of lepidopteran pests by Solenopsis invicta Buren (Hymenoptera: Formicidae) in the Florida Panhandle
Fig. 4. Occurrence of Solenopsis invicta in different peanut phenological stages during the 2018 crop season. West Florida Research and Education Center, Jay, Florida, USA. Means with different letters are significantly different P <0.05 (Tukey's mean separation test).
Fig. 2 in The good side of the bad guys: predation of lepidopteran pests by Solenopsis invicta Buren (Hymenoptera: Formicidae) in the Florida Panhandle
Fig. 2. Occurrence of Solenopsis invicta in hotdog-baited flip-top tubes placed on the ground and on the canopy of peanut fields during the 2017 crop season (log scale). West Florida Research and Education Center, Jay, Florida, USA. P- values from Pearson's Chi Square analysis (χ2 = 48.69; df = 5; P = 2.7 × 10−9).
Fig. 3 in The good side of the bad guys: predation of lepidopteran pests by Solenopsis invicta Buren (Hymenoptera: Formicidae) in the Florida Panhandle
Fig. 3. Comparison of mean Solenopsis invicta between cotton canopy zones during different phenological stages, 2018 crop season. West Florida Research and Education Center, Jay, Florida, USA. Means with different letters are significantly different P <0.05 (Tukey's mean separation test).
Fig. 1 in The good side of the bad guys: predation of lepidopteran pests by Solenopsis invicta Buren (Hymenoptera: Formicidae) in the Florida Panhandle
Fig. 1. Occurrence of Solenopsis invicta in hotdog-baited flip-top tubes placed on the ground and on the canopy of cotton fields during the 2017 crop season (log scale). West Florida Research and Education Center, Jay, Florida, USA. P- values from Pearson's Chi Square analysis (χ2 = 20.68; df = 6; P = 0.0021).
Data from: Unexpected patterns of segregation distortion at a selfish supergene in the fire ant Solenopsis invicta
Background: The Sb supergene in the fire ant Solenopsis invicta determines the form of colony social organization, with colonies whose inhabitants bear the element containing multiple reproductive queens and colonies lacking it containing only a single queen. Several features of this supergene — including suppressed recombination, presence of deleterious mutations and abundant transposable elements, association with a large centromere, and "green-beard" behavior — suggest that it may be a selfish genetic element that engages in transmission ratio distortion (TRD), defined as significant departures in progeny allele frequencies from Mendelian inheritance ratios. We tested this possibility by surveying segregation ratios in embryo progenies of 101 queens of the "polygyne" social form (3512 embryos) using three supergene-linked markers and twelve markers not associated with the supergene. Results: Significant departures from Mendelian ratios were observed at the supergene loci in 3-5 times more progenies than expected in the absence of TRD and than found, on average, among non-supergene loci. Also, supergene loci displayed the greatest mean deviations from Mendelian ratios among all study loci, although these typically were modest. A surprising feature of the observed inter-progeny variation in TRD was that significant deviations involved not only excesses of supergene alleles but also similarly frequent excesses of the alternate alleles on the homologous chromosome. As expected given the common occurrence of such "drive reversal," alleles associated with the supergene evidently gain no consistent transmission advantage over their alternate alleles at the population level. Finally, we observed low levels of recombination and incomplete gametic disequilibrium across the supergene, including between adjacent markers within a single inversion. Conclusions: Our data confirm the prediction that the Sb supergene is a selfish genetic element capable of biasing its own transmission during reproduction, yet counterselection for suppressor loci evidently has produced an evolutionary stalemate in TRD between the variant homologous haplotypes on the "social chromosome". Evidence implicates prezygotic segregation distortion as responsible for the TRD we document, with "true" meiotic drive the most likely mechanism. Low levels of recombination and incomplete gametic disequilibrium across the supergene suggest that selection does not act to preserve a single uniform supergene haplotype.
FIGURE 6 in Histiostoma Blomquisti N. Sp. (Acari: Astigmata: Histiostomatidae), A Phoretic Mite Of The Red Imported Fire Ant, Solenopsis Invicta Buren (Hymenoptera: Formicidae) - Acarologia, 50(3): 357-371
FIGURE 6: Frequency of H. blomquisti n. sp. deutonymphs phoretic on red imported fire ant alates from a 17-month study in 2004 and 2005.
FIGURE 7 in Histiostoma Blomquisti N. Sp. (Acari: Astigmata: Histiostomatidae), A Phoretic Mite Of The Red Imported Fire Ant, Solenopsis Invicta Buren (Hymenoptera: Formicidae) - Acarologia, 50(3): 357-371
FIGURE 7: Frequency of H. blomquisti n. sp. Deutonymphs per ant alate (S. invicta, n = 62 female alates) collected in Pineville/LA/USA from a 2 months study in March and April 2009.
Intergenic sequences of Solenopsis invicta
<p>Intergenic sequences created as part of the Solenopsis ATLAS project.</p>
The occurrence records of Solenopsis invicta
<p>We initially built a robust database of occurrence data for S. invicta, covering its native range (South America) and invaded range (North America). Occurrence records of S. invicta were obtained from Global Biodiversity Information Facility (GBIF; https://www.gbif.org/), AntWeb (https://www.antweb.org/) and AntMap (https://antmaps.org/). We also incorporated distribution records of S. invicta provided by Wetterer (2013) into the dataset. To minimize spatial sampling bias, we used the nearest neighbor distance (NND) method to thin the data, where occurrence points that were less than 1 km from each other were removed. In parallel, we noted that there were still some distribution records of S. invicta in regions north of 40° North Latitude, although S. invicta is considered a tropical insect. We consulted online distribution records of S. invicta at the Centre for Agriculture and Biosciences International (CABI; https://www.cabidigitallibrary.org/doi/10.1079/cabicompendium.50569), and National Invasive Species Information Center (NISIC; https://www.invasivespeciesinfo.gov/terrestrial/invertebrates/red-imported-fire-ant), but no clear information could be found to support the accuracy of the distribution records at these high latitudes. We thus removed these records to avoid interference caused by the temporary, seasonal distribution and possible erroneous records. Therefore, a total of 6,122 records (421 and 5,701 for the native and invaded ranges, respectively) were retained.</p>
Evaluating control methods for red imported fire ant (Solenopsis invicta) and their effects on hibiscus mealybug (Nipaecoccus viridis) and its natural enemies in citrus
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Data from: Unexpected patterns of segregation distortion at a selfish supergene in the fire ant Solenopsis invicta
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Data from: A Comprehensive Account of the Breeding Systems of the Fire Ant Solenopsis invicta
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Data from: Decreased small mammal and on-host tick abundance in association with invasive red imported fire ants (Solenopsis invicta)
Invasive species may impact pathogen transmission by altering the distributions and interactions among native vertebrate reservoir hosts and arthropod vectors. Here, we examined the direct and indirect effects of the red imported fire ant (Solenopsis invicta) on the native tick, small mammal and pathogen community in southeast Texas. Using a replicated large-scale field manipulation study, we show that small mammals were more abundant on treatment plots where S. invicta populations were experimentally reduced. Our analysis of ticks on small mammal hosts demonstrated a threefold increase in the ticks caught per unit effort on treatment relative to control plots, and elevated tick loads (a 27-fold increase) on one common rodent species. We detected only one known human pathogen (Rickettsia parkeri), present in 1.4% of larvae and 6.7% of nymph on-host Amblyomma maculatum samples but with no significant difference between treatment and control plots. Given that host and vector population dynamics are key drivers of pathogen transmission, the reduced small mammal and tick abundance associated with S. invicta may alter pathogen transmission dynamics over broader spatial scales.
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