Christopher C. Witt

The paper examines genetic and phenotypic variation in Andean warblers, finding geographic and plumage-related genetic structure and a hybrid zone with asymmetric introgression.

The paper examines elevational replacement patterns of haemosporidian parasites in three vireo species, finding concordant elevational zonation between hosts and parasites.

The paper examines gene flow patterns in Bells Vireo across a desert contact zone, finding neutral admixture driven by dispersal corridors rather than local adaptation.

This study uses song analysis to distinguish two cryptic giant hummingbird species and identifies their range limits.

The paper clarifies the taxonomy of giant hummingbirds, designates a neotype for Patagona gigas, and identifies misidentified specimens in museum collections.

The paper introduces Arctos, a community-driven collection management system for biodiversity and cultural data, emphasizing its role in enabling research, education, and sustainable data governance.

The paper reports genomes and transcriptomes of 20 bird species, including raptors, and identifies molecular signatures related to predatory and nocturnal adaptations.

The paper develops a sequence capture method to obtain nuclear loci from haemosporidian parasites in wild birds, improving phylogenetic resolution over mitochondrial DNA barcoding.