Radar-measured passerine vertical speeds reveal a migratory switch near a major barrier
Summary: Successful accomplishment of long-distance migration necessitates optimal decision-making processes. Throughout their migration, birds need to constantly choose to fly or to stop. Passerine migrants integrate internal (e.g., lipid deposition) and external (e.g., prevailing winds) factors re...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-02-01
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| Series: | iScience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S258900422500152X |
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| _version_ | 1823864211317456896 |
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| author | Yuval Werber Nir Sapir |
| author_facet | Yuval Werber Nir Sapir |
| author_sort | Yuval Werber |
| collection | DOAJ |
| description | Summary: Successful accomplishment of long-distance migration necessitates optimal decision-making processes. Throughout their migration, birds need to constantly choose to fly or to stop. Passerine migrants integrate internal (e.g., lipid deposition) and external (e.g., prevailing winds) factors resulting in specific departure or landing times. We calculated individual departure and landing timing using vertical-looking radar in the Hula Valley, compiled nightly departure and landing ratios (departure and landing amounts relative to total migration flux), and explored how these are affected by meteorological conditions. Crosswind direction emerged as a key factor affecting departure and landing decisions during autumn migration in the area. Birds avoided drifting toward the Mediterranean Sea by landing and preferred taking off when winds blew away from the sea. Our findings represent an undescribed migration initiation and termination switch with implications for flight and stopover scheduling. The method extends the scope of aeroecological research for addressing individual-level migration behavior. |
| format | Article |
| id | doaj-art-0485126af59546bba90100b7bd9cff2e |
| institution | Kabale University |
| issn | 2589-0042 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | iScience |
| spelling | doaj-art-0485126af59546bba90100b7bd9cff2e2025-02-09T05:00:59ZengElsevieriScience2589-00422025-02-01282111892Radar-measured passerine vertical speeds reveal a migratory switch near a major barrierYuval Werber0Nir Sapir1Department of Evolutionary and Environmental Biology and Institute of Evolution, University of Haifa, Haifa, Israel; Corresponding authorDepartment of Evolutionary and Environmental Biology and Institute of Evolution, University of Haifa, Haifa, IsraelSummary: Successful accomplishment of long-distance migration necessitates optimal decision-making processes. Throughout their migration, birds need to constantly choose to fly or to stop. Passerine migrants integrate internal (e.g., lipid deposition) and external (e.g., prevailing winds) factors resulting in specific departure or landing times. We calculated individual departure and landing timing using vertical-looking radar in the Hula Valley, compiled nightly departure and landing ratios (departure and landing amounts relative to total migration flux), and explored how these are affected by meteorological conditions. Crosswind direction emerged as a key factor affecting departure and landing decisions during autumn migration in the area. Birds avoided drifting toward the Mediterranean Sea by landing and preferred taking off when winds blew away from the sea. Our findings represent an undescribed migration initiation and termination switch with implications for flight and stopover scheduling. The method extends the scope of aeroecological research for addressing individual-level migration behavior.http://www.sciencedirect.com/science/article/pii/S258900422500152XEcologyZoologyOrnithology |
| spellingShingle | Yuval Werber Nir Sapir Radar-measured passerine vertical speeds reveal a migratory switch near a major barrier iScience Ecology Zoology Ornithology |
| title | Radar-measured passerine vertical speeds reveal a migratory switch near a major barrier |
| title_full | Radar-measured passerine vertical speeds reveal a migratory switch near a major barrier |
| title_fullStr | Radar-measured passerine vertical speeds reveal a migratory switch near a major barrier |
| title_full_unstemmed | Radar-measured passerine vertical speeds reveal a migratory switch near a major barrier |
| title_short | Radar-measured passerine vertical speeds reveal a migratory switch near a major barrier |
| title_sort | radar measured passerine vertical speeds reveal a migratory switch near a major barrier |
| topic | Ecology Zoology Ornithology |
| url | http://www.sciencedirect.com/science/article/pii/S258900422500152X |
| work_keys_str_mv | AT yuvalwerber radarmeasuredpasserineverticalspeedsrevealamigratoryswitchnearamajorbarrier AT nirsapir radarmeasuredpasserineverticalspeedsrevealamigratoryswitchnearamajorbarrier |