Showing papers by "Trevor D. Price published in 2005"
TL;DR: These findings provide the strongest evidence yet for “speciation by force of distance” in the face of ongoing gene flow in greenish warblers.
Abstract: Ring species, which consist of two reproductively isolated forms connected by a chain of intergrading populations, have often been described as examples of speciation despite gene flow between populations, but this has never been demonstrated. We used amplified fragment length polymorphism (AFLP) markers to study gene flow in greenish warblers (Phylloscopus trochiloides). These genetic markers show distinct differences between two reproductively isolated forms but gradual change through the ring connecting these forms. These findings provide the strongest evidence yet for "speciation by force of distance" in the face of ongoing gene flow.
192 citations
TL;DR: Methods to correct for the regression effect of sexual selection and assess alternative causal explanations are described.
Abstract: If two successive trait measurements have a less‐than‐perfect correlation, individuals or populations will, on average, tend to be closer to the mean on the second measurement (the so‐called regression effect). Thus, there is a negative correlation between an individual’s state at time 1 and the change in state from time 1 to time 2. In addition, whenever groups differ in their initial mean values, the expected change in the mean value from time 1 to time 2 will differ among the groups. For example, birds feeding nestlings lose weight, but initially heavier birds lose more weight than lighter birds, a result expected from the regression effect. In sexual selection, males who remain unmated in the first year are, on average, less attractive than mated males. The regression effect predicts that these males will increase their attractiveness in the second year more than mated males. In well‐designed experiments, changes in the experimental and control groups would be compared. In observational stud...
137 citations