Contribution to the oology of the Eurasian wryneck Jynx torquilla

Dolenec, Zdravko

doi:10.20302/nc.2020.29.11

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…The maximum length (L) and the maximum breadth (B) of egg were measured with calliper to the nearest 0.01 mm. Egg volume (V) was calculated according to Hoytʼs (1979): V = 0.51 (constant) x L x B²; for example, this method was used by Górski et al 2015, Dolenec 2020 Relative size of the final egg was calculated as percent deviation from mean volume of all eggs in the clutch: %D-value = (VF -VM)100 / VM, in which VF = volume of the final egg and VM = mean egg volume of the clutch (Slagsvold et al 1984). Statistical analyses were conducted using SPSS software Version 17.0.…”

Section: B) Study Area Materials and Methodsmentioning

confidence: 99%

Adaptive final (last-laid) eggs in the Eurasian Blue Tit Cyanistes caeruleus

Dolenec

2022

Larus

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The study was carried out in 2021 using nestboxes. I examined the egg-laying pattern of the socially monogamous free-living Eurasian Blue Tit Cyanistes caeruleus that breeds only once a year in the northwestern Croatia. Nestboxes were visited daily to record the laying date of the first and subsequent eggs. A total of 132 eggs from 12 clutches with 11 eggs in each nest (11-egg clutch is the dominant clutch size in the study area) was measured. The mean egg volume was 1.19 cm³ (± 0.12), and the mean egg volume of all final eggs was 1.22 cm³ (± 0.09). In this study, the %D-value was 2.46. According to this value, the Eurasian Blue Tit population in north-western Croatia adopt a "brood survival strategy", where females allocate greater resources in the final eggs.

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Section: B) Study Area Materials and Methodsmentioning

confidence: 99%

Adaptive final (last-laid) eggs in the Eurasian Blue Tit Cyanistes caeruleus

Dolenec

2022

Larus

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“…Mänd et al 2005, Hoove et al 2020 and in Croatia (e.g. Dolenec 2006, Dolenec 2020) have been based on use of artificial nest sites (nestboxes) by secondary hole-nesting bird species. In this study, nestboxes were used to examine the breeding performance in relation to nestbox floor area size.…”

Section: Introductionmentioning

confidence: 99%

Nestbox floor area size and breeding performance: a study on the Common Starling

Dolenec

2021

Larus

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A Common Starling Sturnus vulgaris population nesting in a Mokrice rural area, northwestern Croatia, was studied during the 2019 breeding season. I compared some breeding characteristics (laying date, clutch size, number of hatchlings and number of fledglings) of first clutches of the Common Starling for different nestbox sizes. There was no any statistically significant difference found between parameters for "normal nestboxes" with a floor area of 256 cm² and "small nestboxes" with a floor area of 121 cm² (all comparisons with p > 0.05). My results are aligned with those papers that have illustrated no connection between breeding performance parameters and nestbox size in secondary holenesting passerines.

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“…Ключові слова: штучні гніздівлі; Jynx torquilla L.; дуплогнізні птахи; північний схід України Вступ В останні роки популяція J. torquilla (L., 1758) у Центральній Європі різко скоротилася (Becker, Tolkmitt, 2011), у багатьох країнах даний вид є рідкісним (Резниченко, 2013;Brünner, Rödl, 2018;Taylor et al, 2020;Dolenec, 2020). Основними причинами зменшення чисельності птахів є знищення середовища їх існування (Assandri et al, 2018), надмірне удобрювання та використання пестицидів (Weisshaupt et al, 2011), зменшення основного джерела корму (наземні мурахи) і відповідно відсутність місць для гніздування (Dolenec, 2020). Між іншим, під час міграцій ці птахи розбиваються об дроти ліній електропередач (Shumaev, 2021).…”

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To the reproduction biology of the Wryneck (Jynx torquilla Linnaeus, 1758) in artificial nests in Northeastern Ukraine

Yarys

2021

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In many countries, the Jynx torquilla population has declined significantly. In Ukraine, the species is considered widespread, but remains poorly studied. Activities to attract birds to parks using artificial nests were carried out during 2004‒2021 in Northeastern Ukraine. The first time the J. torquilla was populated in artificial nests dates back to 2009. During 2019‒2021 4 cases of J. torquilla nesting in artificial nests were recorded. Among the studied territories, the population of J. torquilla in artificial nests was found in the territory of the regional landscape park (RLP) «Feldman Ecopark», NPP «Gomilshansky forests» near the village. Gaidary in Kharkov and the tract «Vakalovschina» near the village Vakalovschina in Sumy regions. In the Northeastern of Ukraine, the number of J. torquilla reaches 14,3±0,32 pairs/km2 in the oak forests of the NPP «Gomilshansky forests» near the village Gaidary, 7,2±0,14 pairs/km2 in the pine forests of the park near the village Zadonetske, 16,2±0,14 pairs/km2 in the «Vakalovschina» tract, 11,1±0,24 pairs/km2 in RLP «Feldman Ecopark». J. torquilla, as a typical hollow-hole, is able to inhabit artificial nests. On average, during 2004–2021, the arrival of the first individuals in the spring was recorded: 21.04 at an average daily temperature of 18° C in the oak grove of the NPP «Gomilshansky forests», 23.04 at a temperature of 17° C in the tract «Vakalovschina», on the territory RLP «Feldman Ecopark» ‒ 02.05 at a temperature of 17° C, 2020 is 05.05 at a temperature of 20° С. It has been proven that 12 days pass from the moment of arrival of birds to the laying of the first egg. The first eggs of birds in the conditions of Northeastern Ukraine, on average, for all years of research, were registered 02.05 in the oak grove of the NPP «Gomilshansky forestsп», 04.05 in the tract «Vakalovschina». On the territory of RLP «Feldman Ecopark» in 2019, the first egg was laid at 14.05 on the material of the nest of the collared flycatcher Ficedula albicollis (Temm., 1815); in 2020 ‒ 19.05. Average clutch size 8,3±0,5 (from 7 to 9). Egg sizes: length – 20,2±0,2 mm, width ‒ 15,1±0,1 mm, volume ‒ 1.4±0.1 mmᶾ, roundness index ‒ 74.7±0.3 %. On average, incubation lasts 13±0,2 days. On the territory of the NPP «Gomilshansky forests» near the village. Gaidary, chicks hatched at 14.05; in the tract «Vakalovschina» on 16.05, on the territory of the RLP «Feldman Ecopark» in 2019 the chicks hatched on 26.05, in 2020 ‒ 01.06. The hatching success was found to be 96,9 % (n=30), where the breeding success is 91,0 %.

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Contribution to the oology of the Eurasian wryneck Jynx torquilla

Cited by 3 publications

References 19 publications

Adaptive final (last-laid) eggs in the Eurasian Blue Tit Cyanistes caeruleus

Adaptive final (last-laid) eggs in the Eurasian Blue Tit Cyanistes caeruleus

Nestbox floor area size and breeding performance: a study on the Common Starling

To the reproduction biology of the Wryneck (Jynx torquilla Linnaeus, 1758) in artificial nests in Northeastern Ukraine

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