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001-es BibID:BIBFORM107677
Első szerző:Cohen, Emily B.
Cím:Spring Resource Phenology and Timing of Songbird Migration across the Gulf of Mexico / Emily B. Cohen, Zoltán Németh, Theodore J. Zenzal, Jr., Kristina L. Paxton, Robert Diehl, Eben H. Paxton, Frank R. Moore
Dátum:2023
Megjegyzések:Migratory songbirds are advancing their arrival to breeding areas in response to climatic warming at temperate latitudes. Less is understood about the impacts of climate changes outside the breeding period. Every spring, millions of migrating songbirds that overwinter in the Caribbean and Central and South America stop to rest and refuel in the first available habitats after crossing the Gulf of Mexico (hereafter, the Gulf). We used capture data from a long-term banding station (20 years: 1993 to 2012) located on the northern coast of the Gulf to assess the passage timing of 17 species making northward migrations into eastern North America. We further assessed spring resource phenology as measured by normalized difference vegetation index (NDVI) on nonbreeding ranges and en route. We tested the hypotheses that spring passage timing has advanced during the past two decades and that annual variability in passage timing into eastern North America is related to spring resource phenology on stationary nonbreeding ranges and during passage south of the Gulf. Further, we assessed whether annual variability in resource phenology south of the Gulf was a good indicator of the conditions that migrants encountered upon first landfall in eastern North America. We found no trend in migration timing for species that migrate from South America and annual variability in their passage timing was unrelated to environmental conditions in nonbreeding ranges or en route. Species that migrate from Central America and the Caribbean delayed arrival by 2 to 3 days over the 20-year period and arrived later during years when conditions were dryer in nonbreeding ranges and passage areas south of the Gulf. Further, yearto- year variability in spring resource phenology in nonbreeding ranges and passage areas south of the Gulf were not good indicators of resource phenology upon arrival in eastern North America. Therefore, despite the fact that many migrant species have been arriving increasingly earlier to breeding grounds, the passage timing of 17 species into eastern North America has either not changed or is slightly later, due to drying spring conditions in Central America and the Caribbean. Our results suggest that Nearctic?Neotropical migratory birds adjust the rate of migration primarily within eastern North America and, in light of warmer temperatures in the temperate zone and earlier arrival timing to breeding ranges, species that overwinter in Central America and the Caribbean may be increasing the speed of migration within eastern North America.
ISBN:9781482240306
Tárgyszavak:Természettudományok Biológiai tudományok könyvfejezet
könyvrészlet
climate change
Nearctic-Neotropical migratory songbirds
resource phenology
timing of migration
Megjelenés:Phenological synchrony and bird migration: changing climate and seasonal resources in North America / E. M. Wood; J. L. Kellermann. - p. 63-82. -
További szerzők:Németh Zoltán (1976-) (biológus) Zenzal, Theodore J. Paxton, Kristina L. Diehl, Robert Paxton, Eben H. Moore, Frank R. (biológus)
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001-es BibID:BIBFORM107652
035-os BibID:(cikkazonosító)e03029 (Scopus)85146456025 (WoS)000916448000001
Első szerző:Zenzal, Theodore J.
Cím:Local weather and endogenous factors affect the initiation of migration in short-and medium-distance songbird migrants / Theodore J. Zenzal , Darren Johnson, Frank R. Moore, Zoltán Németh
Dátum:2023
ISSN:0908-8857
Megjegyzések:Migratory birds employ a variety of mechanisms to ensure appropriate timing of migration based on integration of endogenous and exogenous information. The cues to fatten and depart from the non-breeding area are often linked to exogenous cues such as temperature or precipitation and the endogenous program. Shorter distance migrants should rely heavily on environmental information when initiating migration given relatively close proximity to the breeding area. However, the ability to fatten and subsequently depart may be linked to individual circumstances, including current fuel load and body size. For early and late departing migrants, we investigate effects of temperature, precipitation, lean body mass, fuel load and day of year on the initiation of migration (i.e. fuel load and departure timing) from the non-breeding region by analyzing 21 years of banding data for four species of short- and medium-distance migrants. Temperatures at the non-breeding area were related to temperatures at potential stopover areas. Despite local cues being predictive of conditions further north, the amount variation explained by local weather conditions in our models differed by species and temporal period but was low overall (< 33% variation explained). For each species, we also compared lean body mass and fuel load between early and late departing migrants, which showed mixed results. Our combined results suggest that most individuals migrating short or medium distances in our study did not time the initiation of migration with local predictive cues alone, but rather other factors such as lean body mass, fuel load, day of year, which may be a proxy for the endogenous program, and those beyond the scope of our study also influenced the initiation of migration. Our study contributes to understanding which factors influence departure decisions of short- and medium-distance migrants as they transition from the non-breeding to the migratory phase of the annual cycle.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
departure decisions
house wren Troglodytes aedon
ruby-crowned kinglet Corthylio calendula
swamp sparrow Melospiza georgiana
weather
white-throated sparrow Zonotrichia albicollis
Megjelenés:Journal Of Avian Biology. - 3-4 (2023), p. 1-19. -
További szerzők:Johnson, Darren Moore, Frank R. (biológus) Németh Zoltán (1976-) (biológus)
Pályázati támogatás:FK 124414
Egyéb
ÚNKP-21-5
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