Results 11 to 20 of about 175 (133)

BATScan: A radar classification tool reveals large‐scale bat migration patterns

Methods in Ecology and Evolution, 2023
Bat movement and behaviour are still mostly understudied over large scales. High‐altitude, nocturnal activity makes visual identification of bats from the ground virtually impossible, dramatically hindering our ability to study their movement ecology ...
Yuval Werber, Hadar Sextin, Yossi Yovel, Nir Sapir   +3 more
doaj   +2 more sources

Quantifying range‐ and topographical biases in weather surveillance radar measures of migratory bird activity

Remote Sensing in Ecology and Conservation
Weather radar systems have become a central tool in the study of nocturnal bird migration. Yet, while studies have sought to validate weather radar data through comparison to other sampling techniques, few have explicitly examined the impact of range and
Miguel F. Jimenez, Birgen Haest, Ali Khalighifar, Annika L. Abbott, Abigail Feuka, Aitao Liu, Kyle G. Horton   +6 more
doaj   +2 more sources

BATS: Bat‐aggregated time series—A python‐based toolkit for landscape‐level monitoring of free‐tailed bats via weather radar

Methods in Ecology and Evolution
The US operates a system of 160 S‐band Doppler weather radars known as NEXRAD (NEXt generation weather RADar) that continuously monitors the airspace around the majority of the United States and outlying territories.
Brian Lee, Alex Rich, Robert H. Diehl, Ashley Larsen   +3 more
doaj   +2 more sources

High‐latitude night shortening forces birds to accept increasingly diurnal migration to maintain flight duration

Journal of Avian Biology
The ecological pressures that maintain the behavioral preferences of avian migrants, such as the timing and duration of nocturnal flights, remain elusive yet are critical to understand the evolution of the migratory program.
Ashwin H. Sivakumar, Daniel Sheldon, Kyle G. Horton   +2 more
doaj   +2 more sources

Long‐term analysis of persistence and size of swallow and martin roosts in the US Great Lakes

Remote Sensing in Ecology and Conservation, 2023
In this study, we combined a machine learning pipeline and human supervision to identify and label swallow and martin roost locations on data captured from 2000 to 2020 by 12 Weather Surveillance Radars in the Great Lakes region of the US.
Maria Carolina T. D. Belotti, Yuting Deng, Wenlong Zhao, Victoria F. Simons, Zezhou Cheng, Gustavo Perez, Elske Tielens, Subhransu Maji, Daniel Sheldon, Jeffrey F. Kelly, Kyle G. Horton   +10 more
doaj   +2 more sources

Taxonomic resolution in dual‐polarization weather radar observations of biological scatterers: A systematic review

Ecosphere
The derivation of biological information—abundance, diversity, movement of organisms—from dual‐polarization weather surveillance radars (WSRs) presents an opportunity for novel large‐scale biodiversity monitoring.
Tommy Matthews, Ryan R. Neely III, Valery Melnikov, Christopher Hassall   +3 more
doaj   +2 more sources

Automatic detection of migrating soaring bird flocks using weather radars by deep learning

Methods in Ecology and Evolution, 2023
The use of weather radars to detect and distinguish between different biological patterns greatly improves our understanding of aeroecology and its consequences for our lives.
Inbal Schekler, Tamir Nave, Ilan Shimshoni, Nir Sapir   +3 more
doaj   +2 more sources

A framework for post‐processing bird tracks from automated tracking radar systems

Methods in Ecology and Evolution
Radar is an effective tool for continuous monitoring and quantification of aerial bird movement and used to study migration and local flight behaviour. However, systems with automated tracking algorithms do not provide the level of processing sufficient ...
Jens A. vanErp, Emiel E. vanLoon, Johannes De Groeve, Maja Bradarić, Judy Shamoun‐Baranes   +4 more
doaj   +2 more sources

Avian spring migration at the east Adriatic coast: coastal and sea-crossing dynamics of intensity, timing, and flight directions [PDF]

Movement Ecology
Background Each spring, migratory birds converge along the Croatian coast from various directions, creating a dynamic intersection of flight paths.
Simon Hirschhofer, Peter Ranacher, Barbara Helm, Davor Ćiković, Robert Weibel, Sanja Barišić, Vesna Tutiš, Louie Taylor, Maja Bjelić Laušić, Baptiste Schmid   +9 more
doaj   +2 more sources

High‐intensity bird migration along Alpine valleys calls for protective measures against anthropogenically induced avian mortality

Remote Sensing in Ecology and Conservation
The Alps are a natural barrier for avian broad‐front migration in Central Europe. While most birds that approach the Alps are deflected and circumvent the mountains, some choose to make the crossing.
Simon Hirschhofer, Felix Liechti, Peter Ranacher, Robert Weibel, Baptiste Schmid   +4 more
doaj   +2 more sources