Bobolink surveys guide Audubon farm mowing
Audubon staff in New York's Dutchess County are surveying Bobolink populations to time hay mowing and prevent nestling deaths.
Audubon is conducting grassland bird surveys at its Buttercup Farm Sanctuary in Dutchess County, New York, from late May through August. The research aims to pinpoint when Bobolink nestlings have fledged so that field mowing can be timed to avoid killing the young birds.
Intern Hailey Faurot, writing for Audubon, describes the scene. In late summer, fields buzz with the calls of juvenile Bobolinks gathering in flocks. The team humorously likens the gathering to a "Bobolink summer camp," noting that adult females perch separately at the field edges, perhaps taking a break after rearing their broods.
Survey Methods and Goals
The surveys focus on high-priority conservation species, primarily Bobolinks, with occasional sightings of American Kestrels. Eastern Meadowlarks have not been observed at the site this year, which the team attributes to a lack of sufficiently continuous grassland habitat.
Bobolinks nest on the ground in grassy fields, making them and their young highly vulnerable to agricultural machinery. The core objective is straightforward: learn when the chicks have left the nest. "Our research seeks to find out when most nestlings have fledged, preventing mortality," Faurot explains. This information is then shared with local farmers and landowners through publications and workshops.
A Detailed Field Process
Teams divide the sanctuary into field groups. In one session, a group monitored three fields from five distinct survey points. The protocol requires two minutes of silent observation to let birds acclimate, followed by five minutes of active searching and listening.
At each point, observers record every bird seen, noting its sex, approximate age, and other useful details. Land steward Dave Decker compiles this data at the season's end. The results directly guide habitat management at the sanctuary and inform the advice Audubon gives to area landowners.
Vegetation and Community Outreach
Monitoring the grassland itself is as crucial as counting birds. Bobolinks need fields dominated by grasses. Teams analyze vegetation composition within sampled plots, distinguishing grasses from forbs like milkweed and goldenrod. This data is part of the comprehensive stats gathered to understand the sanctuary's ecosystem.
The project also includes public engagement. Audubon recently hosted high school students from the No Child Left Inside organization, teaching them about the research. This effort blends science with community outreach, much like how a team's squad works together towards a common goal.
Faurot reflects on the broader context. Grassland birds like the Bobolink are in steep decline. While that reality is sobering, her work highlights positive local action. Directly monitoring populations contributes to their conservation. The season ended on a hopeful note: the sight of many juvenile Bobolinks perched on tall grass signaled a successful breeding cycle, complete and safe from the mower's blade.
