Fuelling in front of the barrier - are there age based behavioral differences in Garden Warblers <i>Sylvia borin</i>?

Barboutis, Christos; Henshaw, Ian; Kullberg, Cecilia; Nikolopoulou, Stamatina; Fransson, Thord

doi:10.7287/peerj.preprints.244

Cited by 3 publications

(5 citation statements)

References 15 publications

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“…Furthermore, our results highlight the importance of carefully choosing the sites when planning stopover studies. It might be expected that stopover site fidelity between years exist at sites like this in the same way that has been found close to the Sahara desert crossing in autumn (Cantos and Tellería , Barboutis et al ) even if no recaptures between years were found in our study.…”

Section: Discussionsupporting

confidence: 75%

“…Fry et al , Finlayson , Jenni and Jenni‐Eiermann ). In autumn, garden warblers Sylvia borin on Crete have been shown to fuel for about two weeks and depart across the Mediterranean Sea with fuel loads close to 100% of lean body mass (Fransson et al , Barboutis et al ). Although birds actively chose flight altitudes with favourable wind assistance to minimize energy expenditure over the desert (Schmaljohann et al ) the large amount of fuel accumulated before taking off may still be crucial for successfully reaching the opposite side of the desert (Barboutis et al ).…”

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confidence: 99%

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Inability to regain normal body mass despite extensive refuelling in great reed warblers following the trans‐Sahara crossing during spring migration

Fransson

Karlsson

Kullberg

et al. 2017

Journal of Avian Biology

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Migratory birds wintering in Africa face the challenge of passing the Sahara desert with few opportunities to forage. During spring migration birds thus arrive in the Mediterranean area with very low energy reserves after crossing the desert. Since early arrival to the breeding grounds often is of importance to maximize reproductive success, finding stopover sites with good refuelling possibilities after the Saharan passage is of utmost importance. Here we report on extensive fuelling in the great reed warbler Acrocephalus arundinaceus on the south coast of Crete in spring, the first land that they encounter after crossing the Sahara desert and the Mediterranean Sea in this area. Birds were studied at a river mouth and due to an exceptional high recapture rate (45 and 51% in two successive years), we were able to get information about stopover behaviour in 56 individual great reed warblers during two spring seasons. The large proportion of trapped great reed warbler compared to other species and the large number of recaptures suggest that great reed warblers actively choose this area for stopover. They stayed on average 3–4 d, increased on average about 3.5 g in body mass and the average rate of body mass increase was 4.8% of lean body mass d–1. Wing length affected the rate of increase and indicated that females have a slower increase than males. The results found show that great reed warblers at this site regularly deposit larger fuel loads than needed for one continued flight stage. The low body mass found in great reed warblers (also in birds with high fat scores) is a strong indication that birds staging at Anapodaris still had not been able to rebuild their structural tissue after the strenuous Sahara crossing, suggesting that rebuilding structural tissue may take longer time than previously thought.

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Section: Discussionsupporting

confidence: 75%

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confidence: 99%

Inability to regain normal body mass despite extensive refuelling in great reed warblers following the trans‐Sahara crossing during spring migration

Fransson

Karlsson

Kullberg

et al. 2017

Journal of Avian Biology

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“…For instance, the median autumnal trapping date for the garden warbler on Capri, Southern Italy, was 25 September (Ottosson et al, 2005). The protracted migration of the garden warbler is partly explained by its extensive stopover before crossing the Mediterranean Sea and age‐related differences in the timing of its autumn migration (Barboutis et al, 2014; Hall‐Karlsson & Fransson, 2008). Further north, passage of northern wheatears across the small Heligoland archipelago (Germany) ranges from late July to early November (Dierschke & Delingat, 2003).…”

Section: Discussionmentioning

confidence: 99%

Diet of breeding Eleonora's falconFalco eleonoraein Algeria: Insights for the autumn trans‐Mediterranean avian migration

Samraoui

Kayser

Touati

et al. 2022

Ecology and Evolution

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How environmental changes are affecting bird population dynamics is one of the most challenging conservation issues. Dietary studies of top avian predators could offer scope to monitor anthropogenic drivers of ecosystem changes. We investigated the diet of breeding Eleonora's falcon in an area of Northeastern Algeria in the years 2010–2012. Feathers and insect remains originating from prey plucking behavior were analyzed, providing insights into the seasonally changing diet of this raptor, as well as the trans‐Mediterranean avian migration. A total of 77 species of birds (16 Sylviidae, 11 Turdidae, and 4 Emberizidae), 3 species of insects, and 1 lizard were identified among prey remains, reflecting a diverse diet. Diet composition and prey abundance varied seasonally, faithfully correlating with the passage of migrant birds as recorded from bird ring recoveries. Our findings suggest that dietary studies of predators might be deployed to investigate changes in bird migration. We discuss our results in the context of trans‐Mediterranean migration, with early‐season prey mainly comprising trans‐Saharan migrants (Apus apus and Merops apiaster) and late‐season prey being dominated by Mediterranean winter migrants (Erithacus rubecula, Turdus philomelos, Sylvia atricapilla, and Sturnus vulgaris). Notably, we observed a significant reduction in species richness of passerine remains in 2012, potentially highlighting a decline in the diversity of avian migrants.

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“…When preparing for crossing the Sahara desert birds need to stay much longer at stopover sites to accumulate enough fuel to last them across the desert. Accordingly, in radio tracking studies on Crete, Greece, the majority of garden warblers stayed for more than two weeks and increased in body mass by close to hundred percent before departure (Fransson et al , Barboutis et al ).…”

Section: Discussionmentioning

confidence: 99%

“…It may thus be important for birds to quickly locate suitable feeding areas after landing in order to optimise refuelling rates and reduce the time needed to stay at the site. Studies on local movements of passerines during stopovers show that birds move over larger areas during the first couple of days, after which movements become more aggregated (Chernetsov , Chernetsov and Muhkin , Paxton et al , Cohen et al , Barboutis et al ) which probably corresponds to the search and settling at arrival at a new site. Several factors can potentially affect the exploratory movements after arrival at a new site: e.g.…”

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confidence: 99%

Wide ranging stopover movements and substantial fuelling in first year garden warblers at a northern stopover site

Stach

Fransson

Jakobsson

et al. 2014

Journal of Avian Biology

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Migratory birds use stopovers to replenish their fuel reserves and they generally spend more time at stopover sites than they do in actual fl ight. When arriving at a new stopover site birds may need to search extensively to fi nd a suitable feeding area and this search and settling period may aff ect the duration of stopover. Stopover behaviour can thus have profound eff ects on the migratory programme and studies on stopover behaviour are important to understand migratory strategies. We followed 51 fi rst-year garden warblers Sylvia borin with radio-transmitters at an autumn stopover site on the island of Gotland in southern Sweden. Our aim was to determine the distance birds relocated from the coastal capture site when searching for an area to settle in, and also to establish the duration of stopover and put it in relation to refuelling rate by recapturing a subset of the radio-tracked individuals. Sixteen birds made an extended stopover ( Ͼ 2 d), relocated inland from the capture site and settled on average 5.6 km from the capture site, with the longest recorded relocation being fourteen kilometres. Birds that relocated nocturnally settled in areas further away than birds that relocated diurnally. Th irteen birds that continued migration after a short stop carried larger fuel stores than birds that stopped over longer and they remained close to the capture site until departure. Th ree birds were re-trapped and showed high fuelling rates, between 0.3 and 1.1 g d Ϫ 1 . Th ey left the stopover site with fuel loads between 40 -56 percent of lean body mass, which possibly would have allowed them to reach the Mediterranean area without additional refuelling stops.

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Fuelling in front of the barrier - are there age based behavioral differences in Garden Warblers Sylvia borin?

Cited by 3 publications

References 15 publications

Inability to regain normal body mass despite extensive refuelling in great reed warblers following the trans‐Sahara crossing during spring migration

Inability to regain normal body mass despite extensive refuelling in great reed warblers following the trans‐Sahara crossing during spring migration

Diet of breeding Eleonora's falconFalco eleonoraein Algeria: Insights for the autumn trans‐Mediterranean avian migration

Wide ranging stopover movements and substantial fuelling in first year garden warblers at a northern stopover site

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