Ecological barriers promote risk minimisation and social learning in migrating short-toed snake eagles

Panuccio, Michele; Agostini, Nicolantonio; Premuda, Guido

doi:10.1080/03949370.2011.583692

Cited by 38 publications

(39 citation statements)

References 14 publications

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“…1), roughly 200 short‐toed eagles, mostly juveniles (79%), are observed each year in October (Agostini et al 2009). The geographical location of this island (south‐west in respect to the Italian breeding grounds), the late period (two weeks later than the migration peak of adults) and the age proportion (mostly inexperienced juveniles, while in northern Italy juveniles are usually <20%; Panuccio et al 2011) suggest that these individuals start migrating too late in order to learn the detoured migration from adults and hence, they follow an inherited south‐west direction, which is indeed the most commonly observed in the majority of bird species migrating between Europe and Africa (Newton 2008).…”

Section: Discussionmentioning

confidence: 99%

“…According to visual observations, it has been hypothesized that short‐toed eagles breeding in peninsular Italy use two different flyways during autumn migration, with the most important one (involving roughly 1000 individuals, Panuccio et al 2011) following the Italian peninsula towards France, and where mainly adults are observed (Agostini et al 2002, 2004). Instead, the second one is less conspicuous (roughly 200 individuals), crosses the central Mediterranean via the island of Marettimo (Fig.…”

Section: Theoretical Predictionsmentioning

confidence: 99%

“…different values of maximum extra distances expected according to a strategy of energy minimization (Alerstam 2001). Kerlinger (1989) predicted that generally, in large raptors, flapping flight would represent an energy consumption three to six times higher than soaring flight, while Panuccio et al (2011), using the procedure described by Pennycuick (2008), calculated that for the short‐toed eagle this value is 8.7 times higher. In order to estimate the extra distance (D) up to which the detour would remain energetically economical, we fitted these values of increased energy consumption of flapping flight, as well as the barrier distance (Y b ) that short‐toed eagles migrating from our study area must cross when following a direct route (140 km between Sicily and Tunisia, Fig.…”

Section: Theoretical Predictionsmentioning

confidence: 99%

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Extremely detoured migration in an inexperienced bird: interplay of transport costs and social interactions

Mellone¹,

Limiñana²,

Mallìa³

et al. 2011

Journal of Avian Biology

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We tagged two juvenile short‐toed eagles in southern Italian peninsula with GPS satellite transmitters. According to previous visual observations, two different migratory routes for Italian short‐toed eagles to reach Africa in autumn have been proposed: via Sicily and via Gibraltar. These routes include different over‐water distances to cross the Mediterranean Sea, and thus different proportions of flight modes (soaring–gliding vs flapping–gliding) with resulting different transport costs. Considering different scenarios of energy cost of transport, with flapping–gliding flight over water being more costly than flying over land using soaring–gliding flight, we predicted a maximum optimal detour of 1218 km. Both individuals reached Africa using the longest, detoured, route, avoiding the longest water crossing. To achieve this they began migrating northwards, keeping for ca 700 km a direction opposite to that followed by any other migrating bird from the Northern hemisphere in autumn. The comparison of optimal detour predictions with observed migratory tracks suggests that this migratory strategy prioritizes not only energy minimization, but also safety, given the mortality risk associated with the sea crossing. Finally, it is unlike that these inexperienced individuals followed such a complex route relying only on endogenous information and we therefore suggest, also on the basis of field observations, that social interactions (adult guidance) allow these individuals to learn the detoured route.

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Section: Discussionmentioning

confidence: 99%

Section: Theoretical Predictionsmentioning

confidence: 99%

Section: Theoretical Predictionsmentioning

confidence: 99%

See 1 more Smart Citation

Extremely detoured migration in an inexperienced bird: interplay of transport costs and social interactions

Mellone¹,

Limiñana²,

Mallìa³

et al. 2011

Journal of Avian Biology

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“…Many birds return to known stopover sites and wintering areas used year after year (Åkesson 2003), and they even follow very similar or identical migration routes in consecutive years (Alerstam et al 2006), suggesting that raptors select areas at least in part on the basis of knowledge acquired in previous years (Mellone et al 2012). Moreover, in other species juvenile birds usually follow adult individuals to learn migration pathways, stopover sites and wintering areas (Maransky & Bildstein 2001, Panuccio et al 2012.…”

Section: Discussionmentioning

confidence: 99%

Winter ranging behaviour of a greater spotted eagle (Aquila clanga) in southeast Spain during four consecutive years

Pérez‐García

Sellis²,

Väli

2014

Slovak Raptor Journal

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Knowing the winter behaviour is essential for deciding on conservation strategies for threatened migratory species such as the greater spotted eagle (Aquila clanga). Fidelity and inter-annual variation in winter home range of an Estonian greater spotted eagle were studied during the first four years of its life by means of GPS satellite telemetry in south-eastern Spain. Results show the eagle exploited a small area (12.7 km 2 , 95% kernel) with high inter-annual fidelity during all winter stages. The A. clanga preferred marshes and water bodies and avoided irrigated crops and urban areas. Waterfowl hunting did not show any effect on the spatial pattern of the eagle's behaviour, although water level management in reservoirs could influence their use by the A. clanga. Our study highlights that the wintering home range may be limited to a small suitable habitat patch where human activities, especially water reservoir management, should be regulated.Abstrakt: Nevyhnutným predpokladom efektívnych ochranárskych opatrení je poznanie zimného správania ohrozeného migrujúceho druhu, akým je orol hrubozobý (Aquila clanga). Fidelita a medziročná variabilita charakteristík zimného okrsku jedinca orla hrubozobého pochádzajúceho z Estónska sa sledovala počas prvých štyroch rokov jeho života pomocou GPS-satelitnej telemetrie v juhovýchodnom Španielsku. Z výsledkov vyplýva, že orol využíval počas zimy len malé územie (12,7 km 2 , 95 %-ný kernel) s vysokou medziročnou fidelitou. A. clanga preferoval mokrade a vodné plochy a vyhýbal sa zavlažovaným poľným kultúram a urbanizovaným územiam. Poľovačky na vodné vtáctvo neovplyvnili charakter priestorového správania orla, avšak výška vodnej hladiny vodných rezervoárov mala vplyv na ich využitie sledovaným jedincom. Z výsledkov našej štúdie možno zdôrazniť, že zimný domovský okrsok môže byť priestorovo obmedzený na malé plochy vhodného habitatu, kde by ľudská čin-nosť, najmä manažment vodných rezervoárov, mala byť regulovaná.

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“…Birds migrating through Greece face a large ecological barrier, the Mediterranean Sea, the shortest distance between Greece (Crete Island) and Africa being approximately 280 km. The length of the barrier leads the main flyways of several species to converge through the Balkans and in the Eastern Mediterranean (Panuccio et al 2012, Schindler et al 2015 with only a few raptor species attempting the long water crossing between Greece and Africa (Lucia et al 2011, Panuccio et al 2013.…”

Section: Introductionmentioning

confidence: 99%

The Migration of the Lesser Kestrel Falco naumanni in Eastern Europe - A Ringing Recovery and Direct Observation Approach

Bounas

Panuccio²,

Evangelidis³

et al. 2016

Acrocephalus

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We examined ringing recovery data of the Lesser Kestrel Falco naumanni in order to analyse its migration patterns and philopatry rates in Eastern Europe. In addition, we extracted counts of migrating birds from online databases and studied the use of the flyway as well as the phenology of both spring and autumn migrations through Greece. Birds appeared to migrate in the same mean direction in spring and autumn through the Italian and Balkan Peninsulas. During spring, movements took place on a broad front from March until mid- May with a peak in mid-April; in autumn, birds migrated through Greece on a narrower front from early August to early October, with most of individuals passing through Greece in mid-September. Finally, philopatry rates were higher for adults, while juvenile birds dispersed more often and at longer distances, up to 974 km away. Our results on migration patterns generally agree with those in other studies, but we found some evidence of long-distance premigratory movements towards mainland Greece that could also shape the narrower front migration in autumn. In addition, long distance dispersal movements of juveniles in southeastern Europe, where Lesser Kestrel populations show a fragmented distribution, could facilitate gene flow between populations, thus avoiding the negative effects of mating with genetically similar individuals.

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Ecological barriers promote risk minimisation and social learning in migrating short-toed snake eagles

Cited by 38 publications

References 14 publications

Extremely detoured migration in an inexperienced bird: interplay of transport costs and social interactions

Extremely detoured migration in an inexperienced bird: interplay of transport costs and social interactions

Winter ranging behaviour of a greater spotted eagle (Aquila clanga) in southeast Spain during four consecutive years

The Migration of the Lesser Kestrel Falco naumanni in Eastern Europe - A Ringing Recovery and Direct Observation Approach

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