Loop migration of adult European Honey Buzzards (<i>Pernis apivorus</i>Linnaeus, 1758) through the Central-Eastern Mediterranean

Agostini, Nicolantonio; Lucia, Giuseppe; Mellone, Ugo; Panuccio, Michele; Hardenberg, Jost von; Evangelidis, Angelos; Kominos, Th.

doi:10.1080/11250003.2011.623245

Cited by 12 publications

(9 citation statements)

References 14 publications

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“…As our route selection analysis showed, wind support plays a more important role in over-water flight than uplift. Even in similar uplift conditions between the two seasons, variations in wind support can lead to loop migration patterns [ 48 , 49 ] and even avoidance of sea-crossing in one season [ 18 ]. Moreover, species may differ in their energy- or time-saving strategies between seasons.…”

Section: Discussionmentioning

confidence: 99%

The interplay of wind and uplift facilitates over-water flight in facultative soaring birds

et al. 2021

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Flying over the open sea is energetically costly for terrestrial birds. Despite this, over-water journeys of many birds, sometimes hundreds of kilometres long, are uncovered by bio-logging technology. To understand how these birds afford their flights over the open sea, we investigated the role of atmospheric conditions, specifically wind and uplift, in subsidizing over-water flight at a global scale. We first established that Δ T , the temperature difference between sea surface and air, is a meaningful proxy for uplift over water. Using this proxy, we showed that the spatio-temporal patterns of sea-crossing in terrestrial migratory birds are associated with favourable uplift conditions. We then analysed route selection over the open sea for five facultative soaring species, representative of all major migratory flyways. The birds maximized wind support when selecting their sea-crossing routes and selected greater uplift when suitable wind support was available. They also preferred routes with low long-term uncertainty in wind conditions. Our findings suggest that, in addition to wind, uplift may play a key role in the energy seascape for bird migration that in turn determines strategies and associated costs for birds crossing ecological barriers such as the open sea.

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Section: Discussionmentioning

confidence: 99%

The interplay of wind and uplift facilitates over-water flight in facultative soaring birds

et al. 2021

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“…In fact, in addition to our Spanish and Croatian birds, birds belonging to the Sardinian and Greek populations also exhibited the same pattern (Gschweng et al 2008, Kassara et al 2012). Loop migrations can arise either as a resut of wind, habitat or motivational differences between seasons (Klaassen et al 2010, Alerstam 2011, Agostini et al 2012, Limiñana et al 2012b, 2013). Prevailing wind patterns might explain why Eleonora’s falcons seek to minimize the water crossing during autumn migration but not in spring, when winds are more supportive (Kemp et al 2010, Mellone et al 2011).…”

Section: Discussionmentioning

confidence: 99%

The trans‐equatorial loop migration system of Eleonora’s falcon: differences in migration patterns between age classes, regions and seasons

Mellone¹,

López‐López²,

Limiñana³

et al. 2013

Journal of Avian Biology

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Internal factors such as experience (e.g. age) and motivation for breeding, and external ones such as environmental conditions (e.g. meteorology and landscape characteristics) can promote differences in migratory behaviour and routes among seasons, regions and populations. Using satellite telemetry we investigated whether such differences occur and which factors promote them among migrating Eleonora’s falcons breeding in the Mediterranean area (Spain and Croatia) and wintering in Madagascar. We found that during autumn migration no age differences occur when crossing the Sahara desert, but in the remaining African regions, juveniles were more prone than adults to fly at a slower and more tortuous rate, as well as exhibiting longer stop‐overs, particularly in the Sahel region. Such differences might be promoted by a lower foraging and pre‐migratory fattening efficiency in juveniles. During spring, routes were significantly more eastern than during autumn, resulting in a loop migration occurring in all studied populations. This could be accounted by seasonal variation in the distribution of trophic resources. Our results show that Eleonora’s falcons integrate spatially seasonal changing resources on a continental scale throughout their annual cycle, changing their movement patterns in response to internal (age) and external (habitat) factors. This loop migration pattern may prove to be widespread among other Palearctic trans‐continental migratory bird species.

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“…As our route selection analysis showed, wind support plays a more important role in over-water flight than uplift. Even in similar uplift conditions between the two seasons, variations in wind support can lead to loop migration patterns [47,48] and even avoidance of sea-crossing in one season [18].…”

Section: Discussionmentioning

confidence: 99%

The interplay of wind and uplift facilitates over-water flight in facultative soaring birds

Nourani

Bohrer

Becciu

et al. 2020

Preprint

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The open sea is considered an ecological barrier to terrestrial bird movement. However, over-water journeys of many terrestrial birds, sometimes hundreds of kilometers long, are being uncovered by bio-logging technology. To understand how these birds afford their flights over the open sea, we investigated the role of atmospheric conditions in subsidizing sea-crossing behavior at the global scale. By analyzing forty years of temperature data, we show that the spatio-temporal patterns of sea-crossing in terrestrial migratory birds correspond to favorable uplift conditions. We then analyzed route selection over the open sea for four bird species with varying levels of dependence on soaring flight, representing all major migratory flyways worldwide. Our results showed that favorable uplift conditions, albeit not as common and as powerful as over land, are not rare over the open seas and oceans. Moreover, wind, which is more variable than uplift in its spatio-temporal distribution, is the determining factor in the birds' route selection over the open sea. Our findings suggest a need for revisiting how ecological barriers are defined, to reflect what we know of animal movement in the era of bio-logging.

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Loop migration of adult European Honey Buzzards (Pernis apivorusLinnaeus, 1758) through the Central-Eastern Mediterranean

Cited by 12 publications

References 14 publications

The interplay of wind and uplift facilitates over-water flight in facultative soaring birds

The interplay of wind and uplift facilitates over-water flight in facultative soaring birds

The trans‐equatorial loop migration system of Eleonora’s falcon: differences in migration patterns between age classes, regions and seasons

The interplay of wind and uplift facilitates over-water flight in facultative soaring birds

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