Temporal Characteristics of Night Bird Migration Above Central Israel — A Radar Study

Dinevich, Leonid; Matsyura, А. V.; Leshem, Yossi

doi:10.3161/068.038.0206

Cited by 11 publications

(6 citation statements)

References 13 publications

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“…Other studies, e.g. radar results and references in Dinevich et al (2003), showed that nocturnal migration often starts shortly after sunset and lasts until sunrise and thus overlaps the migration activity of typically diurnal species. The number of 'true' nocturnal migrants is therefore lower.…”

Section: Species and Their Identificationmentioning

confidence: 88%

Nocturnal bird migration at Besh Barmag bottleneck in Azerbaijan as revealed by means of acoustic monitoring

Heiss

2017

Bird Conservation International

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SummaryBird migration studies are sparse in the Caucasus region, but have received more interest in recent years. To date, these studies have focused on diurnal migration and no information about nocturnal bird migration is available from this region. Therefore, nocturnal bird migration in the Besh Barmag bottleneck (Azerbaijan) was acoustically analysed on the basis of 1,464 h 44 min of sound recordings cost-efficiently obtained with an autonomously operating recorder and an omnidirectional microphone between sunset and sunrise on 63 nights in autumn 2011 and 67 nights in spring 2012. In total, 88,455 calls of 106 migrating species were detected. Of these, 2,172 calls could not be identified due to recording deficiencies or imperfect familiarity with some of the vocalisations and may involve as many as 20 species. The calls and songs of another 13 non-migratory species were not counted. Due to organisational or technical constraints some nights in the study periods could not be analysed and so the ensuing data gaps were repaired by interpolation, resulting in an estimated total of 108,986 calls in autumn 2011 and 33,348 calls in spring 2012. In both seasons the most vocally productive and species-rich phase was civil morning twilight, containing as it does the onset of diurnal migration. In autumn 2011, 54.7% of the recorded calls occurred in civil evening and morning twilight and 68.8% in spring 2012. But species and call numbers were also high in the darkest twilight and night phases. The interpretation of the data is, however, partly conjectural and any future access to truly reliable information on migration densities is conceivable only through radar studies.

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Section: Species and Their Identificationmentioning

confidence: 88%

Nocturnal bird migration at Besh Barmag bottleneck in Azerbaijan as revealed by means of acoustic monitoring

Heiss

2017

Bird Conservation International

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“…Радиолокационная станция МРЛ-5 была расположена в Латруне (Центральный Израиль, 34°98'N, 31°83'E, 270 м над уровнем моря). Подробные технические характеристики радиолокатора приведены в (Dinevich et al, 2003).…”

Section: материал и методы исследованийunclassified

Radar Observations of Honey Buzzards’ Daily Migration

Matsyura¹,

Dinevich²

2015

abs

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Представлены результаты радиолокационных наблюдений за миграцией обыкновенного осоеда Pernis apivorus (Linnaeus, 1758) над территорией центрального Израиля. Результаты наших наблюдений позволяют высказать предположение, что стая мигрирующих осоедов выбирает маршрут и высоту миграции, для которых существуют оптимальные метеорологические условия в атмосфере, что позволяет птицам затрачивать минимум энергии. Данные условия проявляются под действием конвективных струй, которые формируются под влиянием берегового бриза и горно-долинного циркуляционного процесса. The initial results of radar study of Honey Buzzard migration above the territory of Central Israel were presented. We came to conclusion that the bird flocks choose the route and height of migratory flights which correspond to the optimum atmospheric conditions and minimum energy costs. This was caused by convective streams and bars that formed under influence of breeze and mountain-valley circulation.

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“…The failure of the breeing attempt reaches 69.7% or more (Melnikov, 1983). Finding out the level of adaptation of birds to exist in such extreme conditions is an essential task of population and evolutionary ecology (Schwartz, 1969;Georgievsky, 1989;Dinevich et al, 2003;Chaplygina et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Ecology of Laridae under conditions of unstable hydrological regime: colony sizes and synchronization of reproduction

Mel’nikov¹

2021

Biosys. divers.

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The problem of criteria for distinguishing colonies from similar socio-demographic structures (mainly in terms of nesting density) is highly relevant and has remained in the focus of attention of ornithologists for a long time. The synchronization of reproduction in a colony is one of the criteria which require special development. Based on particular works (1972–2005), I present synchronization of the reproduction of gulls in colonies of different sizes. In contrast to previous studies, this paper uses a specially developed Index of Synchronization of Bird Breeding (Isr) to study this phenomenon, making it relatively easy to determine its level. The index distinguishes between different species of birds of this group: 75.7% (white-winged black tern) and 97.6% (black-headed gull) of the total variability of synchronization of breeding birds in colonies. Frequent failure of nesting attempts often causes repeated (compensatory) reproduction, which in the case of a mass manifestation significantly reduces the synchronization of the nesting period in colonies and thus significantly reduces this indicator. It is proved that a higher synchronization of reproduction characterizes small colonies (up to 50 nests). In all species of gulls, the beginning of reproduction in different colonies differs in terms of the appearance of the first eggs by 1–10 days and at the beginning of mass egg-laying – by 1–18 days. To the same extent, they differ in the timing of the hatching of eggs. In small colonies, the total egg-laying period is shorter by 34.9–49.7% compared to larger colonies. My observations show that large colonies are formed by the nesting of several small colonies on one plot. This phenomenon is noticeable during periods of mass re-nesting of birds after a high loss of nests (up to 69.5% or more) because of severe flooding. Differences in the breeding periods of colonies that differ in size appear when several small colonies with different breeding periods of birds are combined into one larger colony. This phenomenon is well detected in the formation of several sub-colonies and in the differences in the timing of reproduction of different parts of a large colony.

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Temporal Characteristics of Night Bird Migration Above Central Israel — A Radar Study

Cited by 11 publications

References 13 publications

Nocturnal bird migration at Besh Barmag bottleneck in Azerbaijan as revealed by means of acoustic monitoring

Nocturnal bird migration at Besh Barmag bottleneck in Azerbaijan as revealed by means of acoustic monitoring

Radar Observations of Honey Buzzards’ Daily Migration

Ecology of Laridae under conditions of unstable hydrological regime: colony sizes and synchronization of reproduction

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