Browsing by Author "Véliz D."

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    Green, yellow or black? Genetic differentiation and adaptation signatures in a highly migratory marine turtle
    (Royal Society Publishing, 2021) Álvarez-Varas R.; Rojas-Hernández N.; Véliz D.; Álvarez-Varas R.; Véliz D.; Álvarez-Varas R.; Heidemeyer M.; Riginos C.; Benítez H.A.; Araya-Donoso R.; Reséndiz E.; Lara-Uc M.; Godoy D.A.; Muñoz-Pérez J.P.; Alarcón-Ruales D.E.; Muñoz-Pérez J.P.; Alfaro-Shigueto J.; Ortiz-Alvarez C.; Mangel J.C.; Alfaro-Shigueto J.; Vianna J.A.
    © 2021 The Author(s).Marine species may exhibit genetic structure accompanied by phenotypic differentiation related to adaptation despite their high mobility. Two shape-based morphotypes have been identified for the green turtle (Chelonia mydas) in the Pacific Ocean: the south-central/western or yellow turtle and north-central/eastern or black turtle. The genetic differentiation between these morphotypes and the adaptation of the black turtle to environmentally contrasting conditions of the eastern Pacific region has remained a mystery for decades. Here we addressed both questions using a reduced-representation genome approach (Dartseq; 9473 neutral SNPs) and identifying candidate outlier loci (67 outlier SNPs) of biological relevance between shape-based morphotypes from eight Pacific foraging grounds (n = 158). Our results support genetic divergence between morphotypes, probably arising from strong natal homing behaviour. Genes and enriched biological functions linked to thermoregulation, hypoxia, melanism, morphogenesis, osmoregulation, diet and reproduction were found to be outliers for differentiation, providing evidence for adaptation of C. mydas to the eastern Pacific region and suggesting independent evolutionary trajectories of the shape-based morphotypes. Our findings support the evolutionary distinctness of the enigmatic black turtle and contribute to the adaptive research and conservation genomics of a long-lived and highly mobile vertebrate.
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    The colors of pre-Hispanic textiles from cemeteries in the Quillagua and San Pedro de Atacama oases of Northern Chile
    (John Wiley and Sons Inc, 2021) Niemeyer H.M.; Cárdenas L.M.; Véliz D.
    © 2021 Wiley Periodicals LLC.Few sources of red (anthraquinoids) and blue (indigoids) dyes were used in pre-Hispanic textiles from different cultures, periods, and areas in the South-Central Andes. Yellow dyes have been shown to be mainly flavonoids. Since flavonoids exhibit wide color variations, ample distribution dependent on biogeographical region, and species-specific patterns, color variation in yellow-dyed textiles and sources of yellow dyes are predicted to be higher in relation to red- and blue-colored textiles. The study of textile colors, in particular the comparison between yellow and other colors, should shed light on the relationship of people with the environment and on the processes of selection of sources of raw materials for textiles. Colorimetric data in the CIELAB three-dimensional space were obtained of yarns sampled from pre-Hispanic textiles from San Pedro de Atacama (37 textiles, 79 yarns of different colors) and Quillagua (41 textiles, 95 yarns of different colors), two archeological areas in Northern Chile sustaining different plant communities. The textiles were assigned to different styles (hence to different biogeographical regions). The results showed that the degree of dispersion of colorimetric data was larger in red than in blue yarns, and did not differ between any other pair of colors, and that the degree of dispersion of colorimetric data of yarns from textiles of different styles differed significantly within yellow yarns but not within yarns of other colors. These results are discussed in terms of the nature, variety, and sources of the dyes involved and reveal the use of a limited number of yellow dyes in Northern Chile.