Connectivity in Reed Warblers<i>Acrocephalus scirpaceus</i>Between Breeding Grounds in Europe and Autumn Stopover Sites in Iberia

Andueza, Miren; Barba, Emilio; Arroyo, José Luis; Feliu, J. M. San; Greño, José Luis; Jubete, Fernando Franco; Lozano, Luis; Monrós, Juan S.; Moreno-Opo, Rubén; Neto, Júlio M.; Onrubia, Alejandro; Tenreiro, Paulo; Valkenburg, Thijs; Zumalacárregui, Carlos; González, Carlos; Herrero, Antonio; Arizaga, Juan

doi:10.5253/078.101.0208

Cited by 15 publications

(5 citation statements)

References 24 publications

(28 reference statements)

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“…Despite several previous studies describing regional patterns of reed warbler migration (e.g. Fransson & Stolt, ; Andueza et al ., ; and above), we here explore cross‐continental patterns of migratory connectivity of the species within a framework through which the limitations of ring re‐encounter data can be overcome.…”

Section: Introductionmentioning

confidence: 99%

Delineating large‐scale migratory connectivity of reed warblers using integrated multistate models

Procházka

Hahn

Rolland

et al. 2016

Diversity and Distributions

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Aim Assessing the extent of large-scale migratory connectivity is crucial for understanding the evolution of migratory systems and effective species conservation. It has been, however, difficult to elucidate the annual whereabouts of migratory populations of small animals across the annual cycle. Here, we use the reed warbler (Acrocephalus scirpaceus) as one of the most frequently ringed passerines in Europe to demonstrate how ring re-encounter and geolocator data can be used to effectively quantify range-wide distribution of different populations.Location Birds were ringed across Europe and re-encountered in Europe, Africa and the Middle East. Methods We employed multistate models which quantify range-wide distribution of different breeding populations while accounting for the spatial and temporal heterogeneity in the re-encounter probabilities and differential age-specific survival during migratory and non-migratory periods. In addition, we integrated geolocator and breeding abundance data as well as human population density to provide a realistic picture of the year-round distribution of the reed warbler, a trans-Saharan migrant.Results Our modelling approach revealed frequent use of the western Mediterranean flyway for the majority of western European populations, but a higher absolute number of reed warblers used the eastern flyway. Further, many populations used different stopover areas during post-and pre-breeding migration, resulting in an anticlockwise loop migration pattern.Main conclusions The integrative modelling framework helped us to depict the range-wide migration pattern more realistically than raw ring re-encounter data would allow.

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Section: Introductionmentioning

confidence: 99%

Delineating large‐scale migratory connectivity of reed warblers using integrated multistate models

Procházka

Hahn

Rolland

et al. 2016

Diversity and Distributions

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“…It is therefore highly probable that at least part of the ambiguus populations breeding in Tunisia and Libya do overwinter in the central Sahel, and the winter presence of Barbary Reed Warblers in Niger, Chad or Nigeria would not be surprising. All these elements suggest a potential longitudinally structured connectivity, as found from ring recovery data in the Eurasian Reed Warbler (Proch azka et al 2008, Andueza et al 2013.…”

Section: Discussionmentioning

confidence: 56%

Identifying the winter grounds of the recently described Barbary Reed Warbler (Acrocephalus baeticatus ambiguus)

Jiguet

Dufour

Kardynal

et al. 2022

Ibis

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The Iberian and North African populations of reed warblers have been described recently as a separate taxon, ambiguus, forming a sister clade to the Sahelian subspecies minor of African Reed Warbler Acrocephalus baeticatus. Although the breeding range of ambiguus has been identified, the migration strategy of its populations remained unknown. We deployed geolocators and sampled the innermost primary from breeding adults in Spain for stable hydrogen (δ2H) analyses and also analysed stable carbon (δ13C) and nitrogen (δ15N) isotopes in feathers collected in two reed warbler taxa (Acrocephalus scirpaceus and Acrocephalus baeticatus ambiguus) in Morocco, to identify the moulting and wintering sites of these populations. Ring recoveries, geolocator tracks and probabilistic assignments to origin from δ2H values indicate that Spanish ambiguus are likely to moult south of the Sahara and winter in West Africa, probably from Mauretania to southern Mali and Ivory Coast. Moroccan ambiguus, however, undergo post‐breeding moult north of the Sahara, and possibly then migrate to West Africa. With other populations of ambiguus breeding from Algeria to Libya and probably wintering further east in the Sahelian belt, the Barbary Reed Warbler can therefore be considered a trans‐Saharan migrant, with a post‐breeding moult strategy that varies between populations, and probably structured according to breeding latitude.

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“…, Andueza et al. , Stanley et al. ), but these studies consistently found high convergence of populations, particularly at stopover sites before barriers or at obligatory flyways within narrow land masses (Buehler and Piersma , Fort et al.…”

Section: Discussionmentioning

confidence: 99%

“…Most studies on migratory connectivity to date have addressed connections between the breeding and wintering grounds (Rushing et al 2013, Hobson et al 2014, Fraser et al 2017, and a recent meta-analysis suggested that low migratory connectivity between breeding and wintering populations is common among long-distance migrants (Finch et al 2017). Fewer studies have examined connectivity during migration (H€ ubner et al 2010, Laughlin et al 2013, Andueza et al 2014, but these studies consistently found high convergence of populations, particularly at stopover sites before barriers or at obligatory flyways within narrow land masses (Buehler and Piersma 2008, Fort et al 2009, Piersma et al 2016. Furthermore, for a few songbird species, mortality rates are known to be higher during migration than any other phase of the annual cycle (Sillett and Holmes 2002, Rockwell et al 2017, Rushing et al 2017a).…”

Section: Discussionmentioning

confidence: 99%

Range‐wide populations of a long‐distance migratory songbird converge during stopover in the tropics

Gómez

Guerrero

FitzGerald

et al. 2019

Ecological Monographs

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Geographic convergence during migration influences the extent to which animal populations may experience carry‐over effects across periods of the annual cycle. When most individuals of a population share geographic areas during a given priod, carry‐over effects are likely stronger than when individuals occupy multiple areas. We used genetic data and stable isotope (δ2H) measurements from feathers and claws to describe the likely breeding and wintering geographic origins of a long‐distance migratory songbird (Gray‐cheeked Thrush, Catharus minimus) moving through northern Colombia in spring and fall migration. Furthermore, we used these data coupled with regional occupancy surveys to assess whether individuals from various breeding populations converge during migration and evaluated whether geographic origin, age, or sex affected stopover strategies. We found that range‐wide breeding populations of Gray‐cheeked Thrush converged in northern Colombia in an area spanning <1% of the breeding range, especially during a prolonged spring stopover in the Sierra Nevada de Santa Marta. Breeding (but not winter) origin, sex, and age influenced arrival date and body condition upon arrival at stopover sites where populations converged. Birds from more northerly breeding latitudes, males and adults generally arrived earlier and in lower body condition than those with more southerly breeding origins, females, and juveniles. Our work and other studies suggest that areas in northern Colombia may function as ecological bottlenecks for Gray‐cheeked Thrush because they concentrate individuals from across the breeding range, provide critical resources, and impose constraints during migration. Future studies quantifying the effects of high‐convergence areas on fitness and survival of individuals and their demographic consequences are required to assess their roles as ecological bottlenecks.

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Connectivity in Reed WarblersAcrocephalus scirpaceusBetween Breeding Grounds in Europe and Autumn Stopover Sites in Iberia

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 15 publications

References 24 publications

Delineating large‐scale migratory connectivity of reed warblers using integrated multistate models

Delineating large‐scale migratory connectivity of reed warblers using integrated multistate models

Identifying the winter grounds of the recently described Barbary Reed Warbler (Acrocephalus baeticatus ambiguus)

Range‐wide populations of a long‐distance migratory songbird converge during stopover in the tropics

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