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1

Using microsatellites to obtain genetic structure data for Red-backed Shrike [Lanius collurio]: a pilot study

100%
Pustjens A. Z., Peters J. L., Geertsma M., Gerats T., Esselink H.
Biological Letters
|
2004
|
tom 41
|
nr 2
95-101
2

Differences between the spring and autumn migration of the Red-backed Shrike Lanius collurio: record from the Eilat stopover [Israel]

100%
Tryjanowski P., Yosef R.
Acta Ornithologica
|
2002
|
tom 37
|
nr 2
3

Occurrence of the Red-backed Shrike [Lanius collurio] depends on natural factors and mode of land use in the Quillow catchment, Germany

84%
Latus C., Schulz A., Kujawa K.
Biological Letters
|
2004
|
tom 41
|
nr 2
87-93
4

Predictions of changes in population size of the Red-backed Shrike [Lanius collurio] in Poland: Population viability analysis

84%
Takacs V., Kuzniak S., Tryjanowski P.
Biological Letters
|
2004
|
tom 41
|
nr 2
103-111
5

Male-biased sex of extra pair young in the socially monogamous Red-backed Shrike Lanius collurio

84%
Schwarzova L., Simek J., Coppack T., Tryjanowski P.
Acta Ornithologica
|
2008
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tom 43
|
nr 2
235-239
Females of many socially monogamous bird species engage in — or even actively seek — copulations outside their social pair bond. However, in socially monogamous birds with low breeding abundance, such as the Red-backed Shrike, extra-pair paternity (EPP) was thought to be an exceptional and random incident. Drawing on samples collected in an unusually dense Red-backed Shrike population in the Czech Republic, we show through DNA microsatellite typing that among 65 chicks from 15 nests, 10 individuals (26.5%) had been sired by males other than the nest-attending social mate. All 10 extra pair young were of male sex. In all cases, genetic fathers of extra pair young stemmed from neighbouring territories. Extra pair fathers had significantly longer tarsi than social mates, indicating that female choice was a function of age-class dependent male body size. Our findings support sex allocation theory, which suggests that promiscuous females mating with higher quality males should produce mostly sons.
6

Mites (Acari, Mesostigmata) in the red-backed shrike Lanius collurio and great grey shrike Lanius excubitor nests

84%
Kamczyc J., Teodorowicz E., Gwiazdowicz D. J.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2011
|
tom 10
|
nr 2
The species composition of mesostigmatid mites in the red-backed shrike Lanius collurio and great grey shrike Lanius excubitor nests was studied in the Wielkopolska Region (Central Poland). Totally 15 samples (bird nests) were collected in May 1999. As a result of that study 81 mites were identified and classified to 13 species. The most numerous species was Alliphis halleri.
7

Spatial and temporal relations between the Barred Warbler Sylvia nisoria and the Red-backed Shrike Lanius collurio in the Wielkopolska Region [W Poland]

84%
Kuzniak S., Bednorz J., Tryjanowski P.
Acta Ornithologica
|
2001
|
tom 36
|
nr 2
The Red-backed Shrike and the Barred Warbler are a pair of species engaged in breeding association. Whilst the arrival time of both species from their wintering grounds was not correlated, they differed in median arrival time by only one day. The majority of the Barred Warbler territories were located within those of the Red- backed Shrike, in both forest and farmland plots. Both species differed significantly in their selection of nest sites, at least in farmland. Unlike to the Red-backed Shrike (n = 297), the Barred Warbler (n = 60) preferred blackberry bushes and small deciduous thomless shrubs, and avoided elder, coniferous and hawthorn. The Barred Warbler nests were placed significantly lower than those of the Red-backed Shrike. The results show that no special ecological relationships exist as was suggested in earlier papers for other areas.
8

Does the Red-backed Shrike [Lanius collurio L.] benefit from nesting in the association with the Barred Warbler [Sylvia nisoria Bechst.]?

84%
Golawski A.
Polish Journal of Ecology
|
2007
|
tom 55
|
nr 3
The co-occurrence of Redbacked Shrikes (Lanius collurio) and Barred Warblers (Sylvia nisoria) was monitored during the years 1999–2003 at 343 ha of agricultural landscape of eastern Poland. Each year 25–31 pairs of Red-backed Shrikes and 3–8 pairs of Barred Warblers were nesting. In total, during five seasons, shrikes were nesting in the vicinity (within 50 m from the centre of the Barred Warbler territory) of 22 out of 24 (92%) warbler territories. The breeding success of the pairs nesting close to Barred Warbler territories was 89%, as compared with 61% for the remaining pairs and it was statistically significant. No difference was found in the clutch size between Redbacked Shrikes nesting close to Barred Warblers and far from them, but statistically significant difference was found in numbers of fledglings between them. The present results imply that close nesting of these two species reduces the risk of nest predation. This may be due to the aggression of Barrred Warblers towards potential predators, as this species actively attacks predators near the nest.
9

Food of the Red-backed Shrike Lanius collurio: a comparison of three methods of diet analysis

84%
Tryjanowski P., Karg M. K., Karg J.
Acta Ornithologica
|
2003
|
tom 38
|
nr 1
10

Breeding shrike populations in Turkey: status in 1998-2003

67%
Perktas U.
Biological Letters
|
2004
|
tom 41
|
nr 2
71-75
11

Impact of weather on partial loss of nestlings in the Red-backed Shrike Lanius collurio in eastern Poland

67%
Golawski A.
Acta Ornithologica
|
2006
|
tom 41
|
nr 1
12

Factors affecting occurrence of Red-backed Shrike (Lanius collurio) and Lesser Grey Shrike (Lanius minor) in low-intensify agriculture areas from Estern Europe

67%
Ajder V., Baltag S.
Polish Journal of Ecology
|
2017
|
tom 65
|
nr 2
Shrikes represent an important group of farmland bird species which inhabit open habitats where they prey on invertebrates and small vertebrates. Like the other farmland birds, shrikes are in the decline across their breeding range. During the 2014 breeding season, we conducted point observations in 470 locations in the Republic of Moldova, recording all the shrike individuals that were seen during 5 minutes. The highest density has been recorded for the red-backed shrike Lanius collurio, (0.489–0.652 breeding pairs ha-1) while for lesser grey shrike Lanius minor the density is ten times lower (0.042–0.076 breeding pairs ha-1). These two shrike species select pasture areas for breeding and avoid artificial surfaces, forests and wetlands. Regarding the geomorphological variables, red-backed shrikes and lesser grey shrikes prefer areas of a low, flat ground and aspects with low exposure to the sun radiation. According to the General Linear Model analyses, the red-backed shrike distribution is significantly influenced by percentage of arable land and orchards, while for lesser grey shrike we did not find any significant influence of environmental variables studied.
13

Eggshell pattering in the Red-backed Shrike Lanius collurio: relation to egg size and potential function

67%
Surmacki A., Kuczynski L., Tryjanowski P.
Acta Ornithologica
|
2006
|
tom 41
|
nr 2
14

Changes in breeding populations of six farmland bird species in Western Poland between 1987 and 2007

59%
Krajewska A., Mizera T.
Polish Journal of Ecology
|
2010
|
tom 58
|
nr 3
The breeding populations of the Skylark Alauda arvensis, Yellowhammer Emberiza citrinella, Corn Bunting Miliaria calandra, Yellow Wagtail Motacilla flava, Whinchat Saxicola rubetra, and Red-backed Shrike Lanius collurio were censused by the mapping method on 315 ha of intensive farmland in W Poland. Results obtained in 2006 and 2007 were compared with previously published data from 1987 to 1997. Changes in habitat structure, mainly the decline of margin habitats, and the intensification of agricultural production, which both occurred between the two study periods, affected breeding bird populations; M. flava showed drastic long-term decreasing trends, and M. calandra increased significantly in number. The other four species showed year-to-year variation rather than directional trends. Numbers of A. arvensis declined from 1987 to the late 1990s and subsequently increased. Generally, population trends of the studied species were similar to those in other long-term study plots in Poland but differed from trends in Western Europe.
15

Status, habitat preferences and population estimates of non-breeding shrikes Lanius spp. in Maharashtra and Karnataka states, India

51%
Pande S., Pawashe A., Sant N., Mahabal A.
Biological Letters
|
2004
|
tom 41
|
nr 2
65-69
16

Importance of young shelterbelts for breeding avifauna in agricultural landscape [Turew area, West Poland]

51%
Kujawa K.
Polish Journal of Ecology
|
2004
|
tom 52
|
nr 4
Protection of high biodiversity in an intensively farmed areas is strongly related to managing the diverse structure of a landscape, for example by planting shelterbelts. The study was aimed at recognition of avifauna dynamics in young (with the age of 1–4 years at the beginning of the study) shelterbelts (N=9) and at estimation of their importance for farmland birds. Bird density was estimated by mapping method in successive years 1996–2001 and the data were combined and analysed in respect to age of shelterbelts. Eighteen breeding species were found (5–8 pairs km⁻¹), among them most abundant were Corn Bunting (Miliaria calandra) (with dominance of 33%), Yellow Wagtail (Motacilla flava) (19%) and Whitethroat (Sylvia communis) (12%). No trend in the changes of species richness and total density was recorded. The density of species preferring building nests and/or feeding in herb layer (like Yellow Wagtail, Skylark Alauda arvensis and Whinchat Saxicola rubetra) decreased during study period while the density of species associated to higher layers of vegetation like Yellowhammer (Emberiza citrinella), Red-backed Shrike (Lanius collurio) increased. According to earlier study, bird species richness and abundance in studied young shelterbelts were lower than in several dozens years old ones. However, in relation to species colonization both classes of shelterbelts (species building their nests on the ground or in low shrubs), young shelterbelts were as important as old ones.
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