Speciation with Gene Flow in Northern Saw-whet Owls

Scientists have long thought that for two related populations of birds to evolve into separate species, they needed to be completely separated. This usually means the kind of total separation produced by isolation on islands or by features such ice sheets, mountain ranges, or rivers. However, the complex distributions and migratory nature of many birds mean that long-term total separation of bird populations, long the assumption in speciation research, is actually not necessary for speciation to occur.

Getting to the Bottom of Male Black-Throated Blue Warblers’ Migratory Behavior

Many species of migrant songbirds have a reproductive strategy called protandry, where males arrive at stopovers and breeding sites earlier than females. Ornithologists believe that males do this because it increases their mating opportunities and reduces competition among males for high-quality nest sites. Although it’s a common phenomenon, the question of how males arrive earlier is still unanswered for most species.

Do Songbirds Pay a Price for Winter Wandering?

In years when winter conditions are especially harsh, birds that depend on conifer seeds for food are sometimes forced to leave their homes in northern forests and wander far from their normal ranges to find enough to eat. A new study published in The Auk: Ornithological Advances uses citizen science data to show for the first time …

Are Homebody Warblers More Likely to Sing Together?

Scientists who want to study the evolution of behavior face a fundamental problem: unlike bones, behavior generally doesn’t fossilize. However, that doesn’t mean that extinct species’ behavior doesn’t leave any evidence. The behavior of living or “extant” species can give us clues about the behavior of their ancestors, and we can use the behavior of living species, the evolutionary relationships among species, and computational modelling to make inferences about extinct species’ behavior.

Fly Like an Eagle?

Like many people, I am fascinated by bird flight. Unlike most people, I get to study flight of Golden Eagles for a living. These large birds move through the landscape primarily by soaring—a style of flying where they hold their wings outward and rarely flap, saving them considerable energy. Instead of flapping, they rely on rising air currents to gain altitude.

How Do Traits Change Across a Scrub-Jay Hybrid Zone?

Where should we draw the line between species? Biologists have debated this question for over 100 years. For much of that time, Ernst Mayr’s Biological Species Concept, which defines a species as a group of individuals that is reproductively isolated from other groups, has dominated the conversation. Recently, however, more and more evidence of hybridization between species has accumulated, especially in birds.

Herbicides Don’t Affect Survival of White-Crowned Sparrow Nests & Fledglings

A number of birds that use forests disturbed by timber harvest have been declining for decades in North America’s Pacific Northwest. In this region, timber management often requires spraying competing vegetation with herbicides so that crop trees can grow, but the consequences of this herbicide treatment on bird nesting are poorly understood. We designed an experiment to find out how herbicide application was affecting nesting in the White-crowned Sparrow, a songbird that’s declining in the Pacific Northwest.

Mentors, Consider Involving Your Students in Peer Review

The American Ornithological Society is committed to providing professional development opportunities for our members. With that in mind, if you’re a faculty member and are invited to review a paper for The Auk or The Condor, we encourage you to consider involving graduate students you mentor in the peer review process. If you have an advanced graduate student who …

2019 AOS Award Winners Announced

Every year, the American Ornithological Society presents a range of awards honoring members for their stellar contributions to science and their impactful service to the organization. The 2019 recipients will accept their awards at the annual AOS meeting in Anchorage, Alaska, this June. Their work spans the full breadth of avian science, including contributions to …