Extensive post-breeding movements of Adriatic Yellow-legged Gulls Larus michahellis

Kralj, Jelena; Barišić, Sanja; Ćiković, Davor; Tutiš, Vesna; Swelm, N. Deans van

doi:10.1007/s10336-013-1020-x

Cited by 15 publications

(13 citation statements)

References 14 publications

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“…Even though Santa Clara and Ulia are situated less than 4 km from each other, birds from Ulia tended to use the landfill of Zaluaga (situated to the east) more, while birds from Santa Clara used the Sasieta and Urteta landfills (situated to the south and west of the colony) more. This is in line with studies showing that birds from even very nearby colonies might travel in opposite directions to feed (Grémillet et al 2006, Kralj et al 2014. Our results also suggest such patterns, but the ultimate explaination for this behavior remains unknown.…”

Section: Discussionsupporting

confidence: 92%

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Local use of landfills by a yellow‐legged gull population suggests distance‐dependent resource exploitation

Egunez

Zorrozua

Aldalur

et al. 2018

Journal of Avian Biology

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Understanding the use of feeding sources at the local scale is crucial in comprehending the factors driving population dynamics, dispersal and territory use. Many gull (Larus spp.) populations have increased sharply, which is partly promoted by their use of landfills as a food resource. Although at the large scale it is known that birds from mainland colonies feed more on landfills than those from offshore colonies, at the local scale, this distance‐dependent exploitation has been little studied. Here, then, we study whether the extent of gulls’ use of landfill is distance‐dependent through the study of 3 different gull colonies and five separate landfill sites within a relatively small geographical area. After controlling for bird numbers by both age cohort and colony, we observed that the number of gulls found at each landfill was colony dependent and that it decreased non‐linearly with increased distance to place of birth.

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Section: Discussionsupporting

confidence: 92%

“…Our results also suggest such patterns, but the ultimate explaination for this behavior remains unknown. Future studies using telemetry could be very helpful to determine to what extent landfill use differs between colonies from a local spatial perspective (Kralj et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Local use of landfills by a yellow‐legged gull population suggests distance‐dependent resource exploitation

Egunez

Zorrozua

Aldalur

et al. 2018

Journal of Avian Biology

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“…Surprisingly, these factors negatively affected abundance of birds from this age class, which is in contrast to former findings for adults (Skorka et al 2009). Immature and juvenile gulls are usually dispersive and migrate across Europe (Kilpi and Saurola 1983;Kralj et al 2014). This suggests that at this age Caspian gulls undertake extensive movements through landscape and develop spatial memory maps.…”

Section: Discussionmentioning

confidence: 99%

Response of young and adult birds to the same environmental variables and different spatial scales during post breeding period

2016

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Context How do young birds achieve spatial knowledge about the environment during the initial stages of their life? They may follow adults, so gaining social information and learning; alternatively, young birds may acquire knowledge of the environment themselves by experiencing habitat and landscape features. If learning is at least partially independent of adults then young birds should respond to landscape composition at finer spatial scale than adults, who possess knowledge over a larger area. Objectives We studied the responses of juvenile, immature and adult Caspian Gull Larus cachinnans to the same habitat and landscape variables, but at several spatial scales (ranging from 2.5 to 15 km), during post-breeding period. Methods We surveyed 61 fish ponds (foraging patches) in southern Poland and counted Caspian gulls.Results Juvenile birds responded at finer spatial scales to the factors than did adults. Immature birds showed complicated, intermediate responses to spatial scale. The abundance of juvenile birds was mostly correlated with the landscape composition (positively with the cover of corridors and negatively with barriers). Adult abundance was positively related to foraging patch quality (fish stock), which clearly required previous spatial experience of the environment. The abundance of all age classes were moderately correlated with each other indicating that social behaviour may also contribute to the learning of the environment. Conclusions This study shows that as birds mature, they respond differently to components of their environment at different spatial scales. This has considerable ecological consequences for their distribution across environments.

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“…Resightings recorded during the culling years were excluded, thus excluding possible resightings of individuals (mainly subadults) that were out of the colony during the first culls. As in other studies, it was not possible to quantify any possible bias linked to differences in observation effort among regions (Kralj et al 2014).…”

Section: Study Areamentioning

confidence: 97%

“…While gulls from the Atlantic north Iberian coast colonies are sedentary (Munilla 1997;Arizaga et al 2010), those from Mediterranean basin colonies move long distances, especially when they are young, and follow very different routes. Thus, Yellow-legged Gulls from the Adriatic area move to the Baltic and North Sea coasts (Kralj et al 2014), while those from Eastern Iberian and Southern French coasts (or nearby islands), as well as the Balearic Islands, mainly move to Atlantic coasts from the Bay of Biscay to Portugal (Carrera et al 1993;Martinez-Abrain et al 2002;Rodríguez and Muntaner 2004;Galarza et al 2012). Individuals from southern Iberia disperse along the southern and eastern Iberian coasts (Cuenca and Delgado 2014), and those from the Algerian coast follow two distinct routes, one to the Balearic Sea and Bay of Biscay and the other from southern Iberian coasts to the Atlantic coast of northwestern Iberia (Baaloudj et al 2012).…”

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confidence: 99%

Effects of Age and Culling on Movements and Dispersal Rates of Yellow-Legged Gulls (Larus michahellis) from a Western Mediterranean Colony

Bosch

Pocino²,

Carrera

2019

Waterbirds

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Extensive post-breeding movements of Adriatic Yellow-legged Gulls Larus michahellis

Cited by 15 publications

References 14 publications

Local use of landfills by a yellow‐legged gull population suggests distance‐dependent resource exploitation

Local use of landfills by a yellow‐legged gull population suggests distance‐dependent resource exploitation

Response of young and adult birds to the same environmental variables and different spatial scales during post breeding period

Effects of Age and Culling on Movements and Dispersal Rates of Yellow-Legged Gulls (Larus michahellis) from a Western Mediterranean Colony

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