Effects of summer weather on reproductive success of the Red-backed Shrike (<i>Lanius collurio</i>)

Jørgensen, Peter Søgaard; Tøttrup, Anders P.; Rahbek, Carsten; Geertsma, M.

doi:10.1080/00063657.2012.724051

Cited by 9 publications

(7 citation statements)

References 22 publications

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“…Such extending the foraging time by parents is particularly worth emphasizing because it allows an easy destruction of nests by predators, not only by corvids, but also by mammals like martens or domestic cats (Felis catus Linnaeus, 1758) (Kuzniak & Tryjanowski 2003). Rainfall can thus limit the breeding success of Red-backed Shrikes and contribute to an increase in partial losses as a result of a food deficit during such weather (Tryjanowski et al 2003, Golawski 2006b, Jørgensen et al 2013.…”

Section: Discussionmentioning

confidence: 99%

Weather and predation pressure: the case of the Red-backed Shrike (Lanius collurio)

Goławski¹,

Goławska²

2019

Acta Zool Acad Sci H

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Breeding success in birds is seriously affected by predation, although behaviourist extent can be modified by the weather, its mechanisms are not well understood. Analysis of the breeding success of Red-backed Shrikes (Lanius collurio) in eastern Poland, which has a temperate transitional climate, showed that predation did indeed increase significantly during periods of prolonged rainfall, but that air temperature and wind speed did not affect predation significantly. As insects become less active during rainy weather, predators like Magpies (Pica pica) and Jays (Garrulus glandarius), which frequently consume such prey, then have to switch to birds' eggs and nestlings as sources of food. In recent years, less rain has been falling in this part of Poland in the summer, so one can anticipate a higher level of breeding success in the Red-backed Shrike, if the numbers of potential predators do not increase equally quickly.

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Section: Discussionmentioning

confidence: 99%

Weather and predation pressure: the case of the Red-backed Shrike (Lanius collurio)

Goławski¹,

Goławska²

2019

Acta Zool Acad Sci H

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“…The relationship between laying time and reproductive success was emphasized in some publications (Hušek and Adamík, 2008;Verhulst et al, 1995). These annual disparities could be connected to the climatic difference between the study years (Schaub et al, 2011;Søgaard Jørgensen et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Breeding biology of the red-backed shrike, Lanius collurio, in the Kızılırmak Delta in the north of Turkey

Arslan¹,

Turan²,

Ayaş³

2016

Turk J Zool

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The population trend of the red-backed shrike, Lanius collurio, is declining in its range. We studied the breeding biology of this species in the 2011 and 2012 breeding seasons in the north of Turkey. Our study site was an area of approximately 650 ha in the Kızılırmak Delta. Population density was 2.4 breeding pairs (bp)/10 ha and 2.7 bp/10 ha in 2011 and 2012, respectively. Blackberry bushes were used most frequently as nest sites (66%). The mean height of the nests from the ground was 125 ± 39 cm. The mean height of nest plants was 224 cm ± 76 cm. Nest height and nest plant height were positively correlated. We present an inequality of breeding parameters in the two successive breeding seasons. In 2011, the red-backed shrikes arrived at their breeding sites later, began to breed later, laid smaller clutches, and were less productive than in 2012. The main factor of the nest failures was nest predation in the study area. We detected normal second broods (six pairs) and it seems that this case was not exceptional. The Kızılırmak Delta is an important breeding area of the red-backed shrike population and more comprehensive studies are required.

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“…Therefore, birds with enhanced cognitive abilities, meaning they have a greater capacity for acquiring and processing information, may be able to bene t from having less concealed nests, or at the very least, they can potentially compensate for the lower level of concealment. It can also be linked to microclimatic conditions inside the nest, as it is expected that exposed nests may dry off faster, preventing the chicks from cooling during harsh weather conditions (Jakober and Stauber 2002;Jørgensen et al 2013). A few studies also indicated the importance of forming interspeci c associations to defend the nest.…”

Section: ))mentioning

confidence: 99%

“…This study focused on the Red-backed shrike Lanius collurio, an open-nesting bird species that mainly occupies pastures and meadows interspersed with shrubs and hedges (Brambilla et al 2020). The main causes of brood loses in this species are predation and severe weather conditions (Müller et al 2005;Jørgensen et al 2013). Because predation is so frequent, anti-predatory behaviours such as nest concealment or nest defence are present in the species (Müller et al 2005;Goławski and Goławska 2008;Goławski and Mitrus 2014;Polak 2019).…”

Section: Introductionmentioning

confidence: 99%

Brain size mediates the choice of breeding strategy in the Red-backed shrike Lanius collurio

Bialas

Dylewski

Tobółka

2023

Preprint

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Brain size of vertebrates is a trade-off between natural selection for enhanced cognitive abilities and the energetic constraints of producing brain tissue. Processing a large amount of information can be beneficial but is also time-consuming. Whether it comes to the timing of breeding onset or nest-site selection, the choice of breeding strategy can be related to the size of the brain. Our study aims to reveal whether there is a relationship between brain size, timing of breeding, nest-site choice, and breeding success in Red-backed shrike Lanius collurio. We found that the first egg laying date was affected by the size of the female head size, with large-headed females laying eggs later in the breeding season. The study also found that the probability of breeding success increased with increased nest concealment, however, the relationship was negligible in larger-headed males. In turn, nest concealment was affected not by head size but only by breeding onset. The study suggests that the choice of breeding strategy may be mediated by brain size depending on sex: large-headed females may take more time to choose a nesting site, which may delay the onset of breeding, and large-headed males may benefit from, or at least be able to compensate for poor nest concealment.

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Effects of summer weather on reproductive success of the Red-backed Shrike (Lanius collurio)

Cited by 9 publications

References 22 publications

Weather and predation pressure: the case of the Red-backed Shrike (Lanius collurio)

Weather and predation pressure: the case of the Red-backed Shrike (Lanius collurio)

Breeding biology of the red-backed shrike, Lanius collurio, in the Kızılırmak Delta in the north of Turkey

Brain size mediates the choice of breeding strategy in the Red-backed shrike Lanius collurio

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