Individual responses in spring arrival date to ecological conditions during winter and migration in a migratory bird
Javier Balbontín,Anders Pape Møller,Ignacio G. Hermosell,Alfonso Marzal,Maribel Reviriego,Florentino de Lope +5 more
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The migratory response of individuals to changing climatic conditions experienced during different parts of their life provides evidence for individuals responding differently to prevailing conditions in the winter quarters depending on their age, but not to conditions experienced en route during spring migration.Abstract:
1. We studied lifetime arrival patterns in the barn swallow (Hirundo rustica L.) in relation to variation in ecological conditions, as reflected by the normalized difference vegetation index (NDVI) in the Sub-Saharan winter quarters and at stopover sites in North Africa. 2. Migratory birds have recently advanced their arrival dates, but the relative role of microevolution and phenotypic plasticity as mechanisms of response to changing environmental conditions remains unknown. To distinguish between these two possibilities, we investigated the change in the arrival date using cross-sectional and longitudinal analyses. 3. We predicted that the effect (i.e. slopes) of environmental conditions in stopover or winter areas on arrival date should be similar using cross-sectional and longitudinal analyses in case phenotypic plasticity is the underlying mechanism, or they should differ in case microevolution is the mechanism. 4. As expected according to a previous cross-sectional study, we found an advance in the arrival date when ecological conditions improve in stopover areas and a delay in the arrival date when ecological conditions improve in the winter quarters. 5. Change in the arrival time at the breeding grounds due to ecological conditions found en route and, in the winter areas, was mainly due to phenotypic plasticity as shown by similarities in the slopes found in these relationships using cross-sectional and longitudinal analyses. 6. We also investigated sex and age of barns swallows as sources of variation in the arrival time with respect to conditions experienced in winter and stopover areas. We found that earlier arrival at the breeding grounds due to prevailing ecological conditions found en route in North Africa was similar for males and females of all age-classes. In contrast, individuals tended to delay departure when ecological conditions improved in the winter quarters, but this delay differed among age classes, with old individuals delaying departure more than middle-aged and yearling birds. 7. The migratory response of individuals to changing climatic conditions experienced during different parts of their life provides evidence for individuals responding differently to prevailing conditions in the winter quarters depending on their age, but not to conditions experienced en route during spring migration.read more
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Climate change and timing of avian breeding and migration: evolutionary versus plastic changes
Anne Charmantier,Phillip Gienapp +1 more
TL;DR: The literature is reviewed to disentangle the actions of evolutionary changes in response to selection induced by climate change versus changes due to individual plasticity, that is, the capacity of an individual to adjust its phenology to environmental variables, within the abundant literature on climate change effects on bird phenology.
Journal ArticleDOI
Challenging claims in the study of migratory birds and climate change
Endre Knudsen,Andreas Lindén,Christiaan Both,Niclas Jonzén,Francisco Pulido,Nicola Saino,William J. Sutherland,Lars A. Bach,Timothy Coppack,Torbjørn Ergon,Phillip Gienapp,Jennifer A. Gill,Oscar Gordo,Anders Hedenström,Esa Lehikoinen,Peter P. Marra,Anders Pape Møller,Anna Nilsson,Guillaume Péron,Esa Ranta,Diego Rubolini,Tim H. Sparks,Fernando Spina,Colin E. Studds,Stein Are Sæther,Piotr Tryjanowski,Nils Chr. Stenseth +26 more
TL;DR: A proper integration across biological disciplines seems essential for the field's transition from affirming patterns to understanding mechanisms and making robust predictions regarding future consequences of shifting phenologies.
Journal ArticleDOI
Rainfall-induced changes in food availability modify the spring departure programme of a migratory bird
Colin E. Studds,Peter P. Marra +1 more
TL;DR: This article used longitudinal data on spring departure dates of American redstart (Setophaga ruticilla) to show that annual variation in tropical rainfall and food resources are associated with marked change in the timing of spring departure of the same individuals among years.
Journal ArticleDOI
Increasing phenological asynchrony between spring green-up and arrival of migratory birds
Stephen J. Mayor,Robert P. Guralnick,Morgan W. Tingley,Javier Otegui,John C. Withey,Sarah C. Elmendorf,Margaret E. Andrew,Stefan Leyk,Ian S. Pearse,David C. Schneider +9 more
TL;DR: This work combined satellite and citizen science data to estimate rates of change in phenological interval between spring green-up and migratory arrival for 48 breeding passerine species across North America, highlighting that phenologies of species and trophic levels can shift at different rates, potentially leading to phenological mismatches with negative fitness consequences.
Journal ArticleDOI
A Palaearctic migratory raptor species tracks shifting prey availability within its wintering range in the Sahel
Christiane Trierweiler,Wim C. Mullie,Rudi H. Drent,Klaus-Michael Exo,Jan Komdeur,Franz Bairlein,Abdoulaye Harouna,Marinus de Bakker,Ben J. Koks +8 more
TL;DR: Contrary to earlier hypotheses of random movements in the Sahelian-wintering quarters, the present study shows that Montagu's harriers visited distinct home ranges, they were site-faithful and tracked seasonal changes in food availability related to previous rainfall patterns, caused by the shifting Intertropical Convergence Zone.
References
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