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7 results for “Mioscirtus wagneri”
Genomic insights into the origin of trans-Mediterranean disjunct distributions: The case of the saltmarsh band-winged grasshopper (Mioscirtus wagneri)
<p><span><span><span><span><span><span><span><span><span><span><span><b>Aim:</b> Two main biogeographic hypotheses have been proposed to explain the Mediterranean-Turanian disjunct distributions exhibited by numerous steppe-dwelling organisms, namely (i) dispersal during the Messinian salinity crisis (∼5.96-5.33 Ma) followed by range fragmentation and vicariance, and (ii) Pleistocene colonization and recent processes of population subdivision (<2 Ma). Despite the two hypotheses postulate the role of climatic alterations and changes in landmass configuration on determining such disjunct distributions, estimates of the timing of lineage diversification have not been complemented so far with spatially-explicit tests providing independent evidence on the proximate processes underlying geographical patterns of population genetic connectivity/fragmentation<b>.</b></span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>Location:</b> Mediterranean-Turanian region</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>Taxon:</b> Saltmarsh band-winged grasshopper (<i>Mioscirtus wagneri</i>)</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>Methods:</b> We integrate different sources of genetic (mtDNA and ddRADseq) and spatial information (configuration of emerged lands and niche modelling) to evaluate competing hypotheses of lineage diversification in the saltmarsh band-winged grasshopper, a halophile species showing a classical Mediterranean-Turanian disjunct distribution.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>Results:</b> Phylogenomic analyses reveal the presence of two North African cryptic lineages and support that trans-Mediterranean populations of the species diverged in the Pleistocene, with evidence of post-Messinian permeability of the Strait of Gibraltar to gene flow likely associated with sea level drops during glacial periods. Accordingly, spatial patterns of genetic differentiation are best explained by a scenario of population connectivity defined by the configuration of emerged landmasses and environmentally suitable habitats during glacial periods, a time when effective population sizes of the species peaked as inferred by genomic-based demographic reconstructions.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>Main conclusions</b>: Our results support post-Messinian colonization and Pleistocene diversification as the biogeographic scenario best explaining the trans-Mediterranean disjunct distributions of halophilous organisms.</span></span></span></span></span></span></span></span></span></span></span></p>
Genomic insights into the origin of trans-Mediterranean disjunct distributions: The case of the saltmarsh band-winged grasshopper (Mioscirtus wagneri)
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Figure 2 from: Aguirre MP, Ortego J, Cordero PJ (2018) Influence of grazing on populations of the specialist grasshopper Mioscirtus wagneri inhabiting hypersaline habitats in La Mancha Region, Central Spain. Journal of Orthoptera Research 27(1): 75-81. https://doi.org/10.3897/jor.27.21064
Figure 2 Alkali seepweed prairie (Suaeda vera) without grazing, typical habitat of Mioscirtus wagneri in the study area (Peña Hueca lagoon, Villacañas, Toledo province, Spain). Photo by P.J. Cordero.
Figure 5 from: Aguirre MP, Ortego J, Cordero PJ (2018) Influence of grazing on populations of the specialist grasshopper Mioscirtus wagneri inhabiting hypersaline habitats in La Mancha Region, Central Spain. Journal of Orthoptera Research 27(1): 75-81. https://doi.org/10.3897/jor.27.21064
Figure 5 Relationship between number of Mioscirtus wagneri per square meter (ABUNDANCE) and A. Cover (%) of Suaeda vera (SEEPWEED), and B. Livestock droppings per square meter (DROPPINGS). Open circles may correspond to one or more overlapping data points.
Figure 1 from: Aguirre MP, Ortego J, Cordero PJ (2018) Influence of grazing on populations of the specialist grasshopper Mioscirtus wagneri inhabiting hypersaline habitats in La Mancha Region, Central Spain. Journal of Orthoptera Research 27(1): 75-81. https://doi.org/10.3897/jor.27.21064
Figure 1 Map of the study area (Villacañas, Toledo Province, Central Spain) showing the location of the hypersaline lagoons Tirez and Peña Hueca.
Figure 4 from: Aguirre MP, Ortego J, Cordero PJ (2018) Influence of grazing on populations of the specialist grasshopper Mioscirtus wagneri inhabiting hypersaline habitats in La Mancha Region, Central Spain. Journal of Orthoptera Research 27(1): 75-81. https://doi.org/10.3897/jor.27.21064
Figure 4 Relationship between probability of presence of Mioscirtus wagneri in the transects (PRESENCE) and A. Cover (%) of Suaeda vera (SEEPWEED) for extreme values of livestock droppings per square meter (DROPPINGS), and B. Livestock droppings per square meter (DROPPINGS) for extreme values of cover (%) of S. vera (SEEPWEED).
Figure 3 from: Aguirre MP, Ortego J, Cordero PJ (2018) Influence of grazing on populations of the specialist grasshopper Mioscirtus wagneri inhabiting hypersaline habitats in La Mancha Region, Central Spain. Journal of Orthoptera Research 27(1): 75-81. https://doi.org/10.3897/jor.27.21064
Figure 3 Male Mioscirtus wagneri on alkali seepweed host plant, Suaeda vera. Photo by P.J. Cordero.
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