A characterization of autumn nocturnal migration detected by weather surveillance radars in the northeastern USA.

@article{Farnsworth2016ACO,
  title={A characterization of autumn nocturnal migration detected by weather surveillance radars in the northeastern USA.},
  author={Andrew Farnsworth and Benjamin M. Van Doren and Wesley M. Hochachka and Daniel Sheldon and Kevin Winner and Jed Irvine and Jeffrey Geevarghese and Steve Kelling},
  journal={Ecological applications : a publication of the Ecological Society of America},
  year={2016},
  volume={26 3},
  pages={
          752-70
        }
}
Billions of birds migrate at night over North America each year. However, few studies have described the phenology of these movements, such as magnitudes, directions, and speeds, for more than one migration season and at regional scales. In this study, we characterize density, direction, and speed of nocturnally migrating birds using data from 13 weather surveillance radars in the autumns of 2010 and 2011 in the northeastern USA. After screening radar data to remove precipitation, we applied a… 

Figures from this paper

Seasonal changes in the altitudinal distribution of nocturnally migrating birds during autumn migration
TLDR
Seasonality in the composition of migratory species, and related variation in migration strategies and behaviours, resulted in a convex–concave bounded distribution of migration altitudes, which provides a basis for assessing the implications for migratory bird populations of changes in mid-latitude atmospheric conditions probably occurring under global climate change.
Migratory flight on the Pacific Flyway: strategies and tendencies of wind drift compensation
TLDR
This work uses weather surveillance radar data from spring and autumn (1995–2018) to examine migrants' behaviours in relation to winds in the Pacific Flyway, finding that spring migrants tended to drift on winds, but less so at northern latitudes and farther inland from the Pacific coastline.
Wind drift explains the reoriented morning flights of songbirds
TLDR
It is found that nocturnally migrating birds experienced significant wind drift, even though they often flew at 90° or more to the wind direction, and that some songbird species respond to drift with reoriented diurnal migratory flights.
Seasonal differences in landbird migration strategies
ABSTRACT Migrating birds make strategic decisions at multiple temporal and spatial scales. They must select flight altitudes, speeds, and orientations in order to maintain preferred directions of
A continental system for forecasting bird migration
TLDR
A bird migration forecast system at a continental scale was developed by leveraging 23 years of spring observations to identify associations between atmospheric conditions and bird migration intensity and performance remained high in forecasting events 1 to 7 days in advance.
The Pulse of the Planet: Measuring and Interpreting Phenology of Avian Migration
Changing phenology of bird migration has become a flagship example of the biological impacts of climate change. Bird migration phenology data come from a limited number of time series in
Phenology of nocturnal avian migration has shifted at the continental scale
Climate change induced phenological shifts in primary productivity result in trophic mismatches for many organisms 1 – 4 , with broad implications for ecosystem structure and function. For birds that
Environmental effects on flying migrants revealed by radar
Migratory animals are affected by various factors during their journeys, and the study of animal movement by radars has been instrumental in revealing key influences of the environment on flying
Detecting and Tracking Communal Bird Roosts in Weather Radar Data
TLDR
A machine learning system to detect and track roost signatures in weather radar data that detects previously unknown roosting locations and provides comprehensive spatio-temporal data about roosts across the US.
Innovative Visualizations Shed Light on Avian Nocturnal Migration
TLDR
An interdisciplinary team of ecologists, meteorologists, computer scientists, and graphic designers are assembled to develop two different flow visualizations, which are interactive and open source, in order to create novel representations of broad-front nocturnal bird migration to address a primary impediment to long-term, large-scaleNocturnal migration monitoring.
...
...

References

SHOWING 1-10 OF 89 REFERENCES
Mapping Wintering Waterfowl Distributions Using Weather Surveillance Radar
TLDR
Weather radars provide accurate measures of relative wintering waterfowl density that can be used to comprehensively map their distributions over large spatial extents.
Quantifying Bird Density During Migratory Stopover Using Weather Surveillance Radar
TLDR
In general, adjusting reflectivity based solely on the VPRs derived using observed refractive conditions yielded the most accurate radar-based estimates of bird density.
Radar observations of bird migration over the Western North Atlantic Ocean
TLDR
During two fall migration seasons, a large number of flying targets were tracked by a radar mounted on an oceanographic research vessel, and evidence was obtained that many of the targets were birds engaging in migration between coastal North America and the neotropics.
Using a Network of WSR-88D Weather Surveillance Radars to Define Patterns of Bird Migration at Large Spatial Scales
Only one study has examined nocturnal bird migration at a continent-wide scale in North America, and it was limited to four nights in October (Lowery and Newman 1966). Most radar studies of bird
Radar analysis of fall bird migration stopover sites in the northeastern U.S.
ABSTRACT The national network of weather surveillance radars (WSR-88D) detects flying birds and is a useful remote-sensing tool for ornithological study. We used data collected during fall 2008 and
A comparison of nocturnal call counts of migrating birds and reflectivity measurements on Doppler radar
TLDR
Most of the hour-to-hour and night- to-night patterns of density and vocalization counts are significantly related and the null hypothesis that the patterns of reflectivity measurements and number of vocalizations during nocturnal migration are not related is rejected.
Bird migration flight altitudes studied by a network of operational weather radars
TLDR
It is shown that weather radar can extract near real-time bird density altitude profiles that closely correspond to the density profiles measured by dedicated bird radar, and can be used as a reliable sensor for quantifying bird densities aloft in an operational setting, which enables the mapping and continuous monitoring of bird migration flyways.
Are flight paths of nocturnal songbird migrants influenced by local coastlines at a peninsula
By recording nocturnally migrating passerines with tracking radar we have investigated how coastlines affect the migrants’ flight paths. Birds could use coastlines as an orientation aid or as a
Analyzing NEXRAD doppler radar images to assess nightly dispersal patterns and population trends in Brazilian free-tailed bats (Tadarida brasiliensis).
TLDR
Radar reflectivity data from the New Braunfels, Texas NEXRAD station is used to examine relative colony size, direction of movement, speed of dispersion, and altitude gradients of bats from these colonies following evening emergence and indicates cyclical changes in colony size from year to year.
Autumn morning flights of migrant songbirds in the northeastern United States are linked to nocturnal migration and winds aloft
ABSTRACT Many passerines that typically migrate at night also engage in migratory flights just after sunrise. These widely observed “morning flights” often involve birds flying in directions other
...
...