Jeffrey L. Peters

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Species-level DNA phylogenies frequently suffer from two shortcomings--gene trees usually are constructed from a single locus, and often species are represented by only one individual. To evaluate the effect of these two shortcomings, we tested phylogenetic hypotheses within the wigeons and allies, a clade of Anas ducks (Anatidae) composed of five species.(More)
We studied the phylogenetic relationships of four duck genera endemic to South America: Brazilian teal Amazonetta brasiliensis, spectacled duck Speculanas specularis, crested duck Lophonetta specularioides, and four species of steamer ducks Tachyeres patachonicus, T. leucocephalus, T. pteneres, T. brachypterus. Genetic divergence within and among species(More)
Inferring aspects of the population histories of species using coalescent analyses of non-coding nuclear DNA has grown in popularity. These inferences, such as divergence, gene flow, and changes in population size, assume that genetic data reflect simple population histories and neutral evolutionary processes. However, violating model assumptions can result(More)
A central theme in landscape ecology is that of understanding the consequences of landscape heterogeneity for ecological processes. The effects of landscape heterogeneity on parasite communities are poorly understood, although it has been shown that anthropogenic impacts may contribute to outbreaks of both parasites and pathogens. We tested for effects of(More)
Under drift-mutation equilibrium, genetic diversity is expected to be correlated with effective population size (N e ). Changes in population size and gene flow are two important processes that can cause populations to deviate from this expected relationship. In this study, we used DNA sequences from six independent loci to examine the influence of these(More)
The Isthmus of Tehuantepec has played an important role in shaping the avian diversity of Mexico, as well as the rest of the Western Hemisphere. It has been both a barrier and a land connector between North and South America for many groups of birds. Furthermore, climatic change over the Pleistocene has resulted in ecological fluctuations that led to(More)
divergent selection can lead to substantial morphological and behavioral differences despite slight differentiation in neutral genetic variation. we examined the evolutionary history of two closely related waterfowl, the Cinnamon Teal (Anas cyanoptera) and blue-winged Teal (A. discors), that are morphologically distinct but paraphyletic in mitochondrial dna(More)
Copyright: © 2015 Okanga et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Host and pathogen ecology are often closely linked, with evolutionary processes often leading to the development of host specificity traits in some pathogens. Host specificity may range from 'generalist', where pathogens infect any available competent host; to 'specialist', where pathogens repeatedly infect specific host species or families. Avian malaria(More)
flow and hybridization between numerically imbalanced populations of two ducks species on the subantarctic island of South Georgia. PLoS ONE (in review). Molecular phylogeny of the South American sheldgeese with implications for conservation of Falkland Islands (Malvinas) and continental populations of the Ruddy-headed Goose Chloephaga rubidiceps and Upland(More)