Differential migration and body condition in Northern Wheatears (Oenanthe oenanthe) at a Mediterranean spring stopover site

Maggini, Ivan; Spina, Fernando; Voigt, Christian C.; Ferri, Andrea; Bairlein, Franz

doi:10.1007/s10336-012-0896-1

Cited by 22 publications

(19 citation statements)

References 34 publications

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“…Lastly, individuals with different morphologies may vary in their migratory behaviour, e.g. long-winged birds are known to cover longer distances than short-winged conspecifics [8,9].…”

Section: Introductionmentioning

confidence: 99%

Variability and repeatability of noctule bat migration in Central Europe: evidence for partial and differential migration

Lehnert

Kramer‐Schadt

Teige³

et al. 2018

Proc. R. Soc. B.

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Each year, large numbers of bats move across Europe between their summer and winter areas, yet even though many of them are endangered and legally protected, we are unaware about many aspects of their migratory behaviour. Here, taking Nyctalus noctula as a model species, we used stable hydrogen isotopic values in fur ( δ 2 H f ) as an endogenous marker to shed light on the migratory behaviour of more than 1000 bats from hibernacula across Central Europe. Specifically, we asked the following questions: how flexible is migration in temperate zone bats? Which general migration pattern do noctule bats follow? How repeatable and thus predictable is the migratory behaviour of individuals? Do morphological correlates of migration occur in bats? Our study confirmed that noctule bats engage in partial and female-biased migration across Europe, suggesting the strongest migration pressures for northern populations. Further, we revealed a combination of partial and differential migration patterns with highly variable migration distances which lead to a pronounced mixing of different source populations in hibernacula where mating occurs. Most individuals were consistent in their migration strategy over time, i.e. 86% could be repeatedly assigned to either long-distance or regional origin across years. This is consistent with our finding that the between-individual component explained 84% of the variation in δ 2 H f values, suggesting specialized individual migratory behaviours and a strong natal philopatry. We discovered a positive correlation between forearm length and migration distance and support for sex-specific effects of migration on body condition. Our study elucidated migration patterns over large geographical scales, demonstrating that considerable numbers of migratory bats originating from distant populations depend on hibernacula across Central Europe, calling for international conservation management.

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“…Lastly, individuals with different morphologies may vary in their migratory behaviour, e.g. long-winged birds are known to cover longer distances than short-winged conspecifics [8,9].…”

Section: Introductionmentioning

confidence: 99%

Variability and repeatability of noctule bat migration in Central Europe: evidence for partial and differential migration

Lehnert

Kramer‐Schadt

Teige³

et al. 2018

Proc. R. Soc. B.

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“…Delayed migration to match optimal environmental conditions at the breeding grounds has been previously observed (Maggini et al. ). Complex interactions among species‐specific migration strategy, environmental conditions, and habitat quality ultimately define the success of migration.…”

Section: Discussionmentioning

confidence: 74%

Foraging behavior of three species of songbirds during stopover in southeastern Morocco during spring migration

et al. 2015

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ABSTRACT. Investigators studying the stopover ecology of migrating birds typically use the capture-recapture method to examine important parameters such as fuel deposition rates (FDR) and stopover duration. However, such studies can be constrained by the number of recaptures. An alternative method is to calculate a regression of mass over time of day, but this method may not be reliable because patterns of mass change of individual birds through the day may not reflect that of the whole population. Given the potential constraints of these methods, using them in combination with other methods, such as behavioral observations of foraging birds, may improve our understanding of the patterns of fuelling in birds at stopover sites. We observed the foraging behavior of three songbird species, including Western Bonelli's (Phylloscopus bonelli), Subalpine (Sylvia cantillans), and Willow (Phylloscopus trochilus) warblers, from 15 March to 30 April 2011 at a small oasis at the northern border of the Sahara desert in southeast Morocco. Given the location of our study site at the northern edge of the Sahara desert, birds migrating north likely needed to replenish their energy reserves at this stage of their journey. We assessed foraging effort by determining the rate (number per unit time) at which birds pecked at substrates or made aerial forays after flying insects. Peck rates were higher for Western Bonelli's Warblers than for Subalpine and Willow warblers, suggesting either species-specific adaptations to feeding in arid environments or differences in the motivation to feed. In addition, Western Bonelli's Warblers had FDRs that were negative or close to zero and, therefore, were apparently unable to refuel successfully (i.e., increase their fuel stores) despite greater effort, possibly indicating less efficiency in obtaining food (i.e., more unsuccessful pecks). The lower peck rates of Subalpine and Willow warblers suggest either that they were less efficient at finding prey or were simply foraging at lower rates. For all three species, peck rates were lower at higher wind speeds, suggesting that wind may alter prey availability and detectability, especially of flying insects. Interactions among species-specific migration strategies, environmental conditions, and habitat quality ultimately define the success of migration. Our results suggest that using observational data in combination with capture data may improve our understanding of these interactions at migration stopover sites. RESUMEN. Conducta de forrajeo en tres especies de aves canoras que usan como parada el sureste de Marruecos durante la migración primaveralLos investigadores que estudian la ecología de aves migratorias en sus paradas, típicamente utilizan el método de recaptura para examinar parámetros tan importantes como la tasa de deposición de combustibles (FDR) y la duración de la parada. Sin embargo, estos estudios pueden ser limitados por el número de recapturas. Un método alterno es calcular una regresión de la masa durante el periodo del dia, pero e...

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“…This reflects population‐specific timing of migration, a phenomenon well known among several European species (Arizaga & Barba , Maggini et al . ), and the White Stork in particular (Cramp ). Local storks, many of them juveniles, feed on both landfills from June to August before they depart for their southern wintering quarters (Resano‐Mayor et al .…”

Section: Discussionmentioning

confidence: 99%

Importance of artificial stopover sites through avian migration flyways: a landfill‐based assessment with the White StorkCiconia ciconia

Arizaga

Resano‐Mayor

Villanúa

et al. 2018

Ibis

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Open landfills seem to be playing an increasing role as target feeding areas for several species, not only in their breeding areas or during the winter, but also during the migration period. Evaluating the extent to which landfill sites are used by migrants is crucial to understanding their role in driving stopover decisions during migration, and in the potential health risks linked to feeding on refuse. The aim of this study was to evaluate the role of two open landfills located just before (France) and after (Spain) the East-Atlantic flyway enters Iberia through the western Pyrenees as potentially important stopover sites for the White Stork populations moving along this route. Overall, we detected that these sites were used by storks that had been ringed from many western European breeding populations, mainly during the migration period, but also in winter. The mean distance between the stork breeding/ringing origin and the landfill sites increased from summer to winter, suggesting that storks breeding further away pass through Iberia later in the season, reflecting population-specific timing of migration. During the autumn migration period (August-September), the first encountered landfill in France was estimated to be used by c. 1200 storks, and the other in Spain by 4000 storks. Our study hence contributes to a better understanding of the current and potentially hazardous role played by landfill sites in White Stork ecology, which is essential in order to provide management recommendations, and to evaluate the consequences of proposed open landfill closures in Europe.During long-distance migration, most birds need to stopover to refuel so they can successfully undertake subsequent flight bouts. Sometimes, migrants depend on very specific target stopover locations for that purpose, and hence these sites are crucial for the success of migration, even of entire populations (Newton 2008). This can be the case for stopover sites close to bottlenecks which concentrate high numbers of migrants. Soaring birds, including storks or raptors, largely rely on thermal updrafts for assisted flight and normally avoid large fuel accumulations, as they have a relatively small energy consumption during migration (Alerstam 1993). However, even these species still need some refuelling along their migration routes, especially when crossing hazardous geographical obstacles such as seas, mountains or deserts, which might require additional energy investment (Yosef et al.

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Differential migration and body condition in Northern Wheatears (Oenanthe oenanthe) at a Mediterranean spring stopover site

Cited by 22 publications

References 34 publications

Variability and repeatability of noctule bat migration in Central Europe: evidence for partial and differential migration

Variability and repeatability of noctule bat migration in Central Europe: evidence for partial and differential migration

Foraging behavior of three species of songbirds during stopover in southeastern Morocco during spring migration

Importance of artificial stopover sites through avian migration flyways: a landfill‐based assessment with the White StorkCiconia ciconia

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