The Subantarctic Rayadito (Aphrastura subantarctica), a new bird species on the southernmost islands of the Americas Page: 9
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Figure 6. Genetic variation among five populations of Aphrastura, based on 153 individuals genotyped at 12
polymorphic microsatellite loci. (A) Scatterplot from the first three principal components that explained 25.5%
of the genetic variance. 95% CI ellipses are shown. (B) Individual assignment to genetic clusters for the five
sampled populations. Bars represent individual posterior membership probabilities to each of the three genetic
clusters found using the 'snapclust' method. MA Manquehue, BA Bariloche, TF Tierra del Fuego, NI Navarino
Island, DR Diego Ramirez (representing the proposed new species A. subantarctica) .Genetic cluster
Central South Diego Ramirez
Central - 0.216 0.688
South 0.055 - 0.590
Diego Ramirez 0.346 0.289 -Table 5. Pairwise G-statistics for the three main genetic clusters of Aphrastura populations identified (see
"Methods" for details). Values below the diagonal correspond to the Nei's standardized index G'ST(Nei), while
values above the diagonal (italics) were calculated using Hedrick's standardized index corrected for small
samples G"sT The true GST value is supposed to lie in between the two indexes71. All p values <0.001 (based on
1000 permutations).
were assigned to a population different from the one from which they were captured. This was true for some birds
in the central and southern clusters, but not for any individual from Diego Ramirez (100% correct assignment;
Fig. 6). These results are in line with the analysis using GeneClass2, in which no first-generation migrants were
detected in Diego Ramirez for any of the 10 replicates performed, whereas the southern cluster harbored four
potential immigrants from the central cluster (Supplementary Information Appendix 4).
Characterization of the new species. Based on the strong genetic differentiation, as well as marked
morphological and behavioral differences described above for the Diego Ramirez Aphrastura population, as
compared to the continental Aphrastura population, we propose the following new bird species.
Order: Passeriformes (Linnaeus, 1758)47.
Family: Furnariidae (Gray, 1840)48.
Genus: Aphrastura (Oberholser, 1899)49.
Scientific name: Aphrastura subantarctica, sp. nov. R Rozzi, CS Quilodran, E Botero-Delgadillo, RD Crego,
C Napolitano, O Barroso, JC Torres-Mura & RA Vasquez.
Common name (English): Subantarctic Rayadito.
Common name (Spanish): Rayadito Subantartico.https://doi.org/10.1038/s41598-022-17985-4
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Scientific Reports (2022) -12:13957
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Rozzi, Ricardo, 1960-; Quilodrán, Claudio S.; Botero-Delgadillo, Esteban; Napolitano, Constanza; Torres-Mura, Juan C.; Barroso, Omar et al. The Subantarctic Rayadito (Aphrastura subantarctica), a new bird species on the southernmost islands of the Americas, article, August 26, 2022; (https://digital.library.unt.edu/ark:/67531/metadc2178792/m1/9/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT College of Science.