Exploratory analyses ofmigration timing andmorphometrics of the Song Thrush (Turdus philomelos)

Csörgő, Tibor; Fehérvári, Péter; Karcza, Zsolt; Harnos, Andrea

doi:10.1515/orhu-2017-0009

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…This pattern indicates that northern populations winter north of the Mediterranean countries, while central European populations are exposed to severe hunting pressures in the non-breeding season.The majority of Croatian Blackbirds are possibly residents, hence the low proportion of hunting related ring recoveries. These patterns are somewhat different to that in Song Thrushes (see Csörgő et al 2017), where birds from northern European populations are also exposed to severe hunting pressures. The Usutu virus, a vector-borne flavivirus has also been responsible for severe local mass mortalities that have disproportionately affected this thrush species (Bakonyi et al 2007).…”

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confidence: 72%

Exploratory analyses ofmigration timing andmorphometrics of the Common Blackbird (Turdus merula)

Csörgő

Fehérvári

Karcza³

et al. 2017

Ornis Hungarica

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Ornithological studies often rely on long-term bird ringing data sets as sources of information. However, basic descriptive statistics of raw data are rarely provided. In order to fill this gap, here we present the fourth item of a series of exploratory analyses of migration timing and body size measurements of the most frequent Passerine species at a ringing station located in Central Hungary (1984-2016). First, we give a concise description of foreign ring recoveries of the Common Blackbird in relation to Hungary. We then shift focus to data of 6849 ringed individuals and 6081 recaptures derived from the ringing station, where birds have been trapped, handled and ringed with standardized methodology since 1984. Timing is described through annual and daily capture and recapture frequencies and their descriptive statistics. We show annual mean arrival dates within the study period and present the cumulative distributions of first captures with stopover durations. We present the distributions of wing, third primary, tail length and body mass, and the annual means of these variables. Furthermore, we show the distributions of individual fat and muscle scores, and the distributions of body mass within each fat score category. We distinguish the spring and autumn migratory periods, breeding and wintering seasons, ages (i.e. juveniles and adults) and the two sexes. Our aim is to provide a comprehensive overview of the analysed variables. However, we do not aim to interpret the obtained results, merely to draw attention to interesting patterns that may be worth exploring in detail. Data used here are available upon request for further analyses.

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confidence: 72%

Exploratory analyses ofmigration timing andmorphometrics of the Common Blackbird (Turdus merula)

Csörgő

Fehérvári

Karcza³

et al. 2017

Ornis Hungarica

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Migration and wintering of Fieldfare (Turdus pilaris) in southeastern Hungary

Bozó

2019

Ornis Hungarica

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The Fieldfare is a bird species widely distributed in the Palearctic region. In Hungary, the species is considered as a rare breeder and common, sometimes abundant migrant in autumn and spring, and also as winter visitor. It is prone to invasion, since northern breeding populations leave the breeding sites in large numbers only when the available food is inadequate or inaccessible to the birds. Most populations follow a southern-southwestern migration pattern, and in the course of their movement they also migrating through the Carpathian Basin. In this study, we examined the migration and wintering of the species in an area of southeast Hungary between 2004 and 2019. Data were collected between the beginning of October and the middle of April and during that period we saw Fieldfares a total of 416 times. In addition to the description of migration, the effect of weather on bird numbers was also investigated. According to our results, the species appears in the area in October and disappears in late March and the first half of April. The individuals that migrate in October are likely belonging to the Central European breeding population, while from November the Scandinavian birds can be seen. The maximum number of birds observed during the different years showed significant differences, as did the patterns of movements within the seasons. The relationship between the local weather and the number of birds has been demonstrated over several seasons, which is typical of species with an escape migration.

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Analysis of Ring Recoveries of Song Thrushes Turdus philomelos in North Africa

Scebba,

del Castillo,

Sorrenti

2023

The Ring

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This study investigates the wintering range and migratory patterns of the Song Thrush in North Africa, focusing on the Maghreb region. Despite the fact that this is the southernmost limit of its wintering range, comprehensive analyses of its geographic origin and spatial distribution are lacking. The research utilizes 840 records, representing the first comprehensive analysis of ringed bird recoveries in North Africa. Findings reveal that the Song Thrush is a common visitor to the Mediterranean belt of North Africa, with distinct migratory routes for different populations. Notably, Italy contributes significantly to the total number of recoveries. The study highlights North Africa as a wintering area for both long-distance migrants and partially migratory populations from Western and Central Europe. An intriguing observation is the disproportionate concentration of recoveries in Algeria (89.6%), particularly in the Kabylie region, suggesting potential biases due to hunting and trapping activity. Temporal analyses indicate a decline in captured birds from the 1960s to the 2000s, possibly reflecting changes in hunting pressures across North Africa. The seasonal distribution of recaptures shows a peak in January, emphasizing the thrushes’ southward movements within their wintering range. The study challenges previous assumptions of early spring migration, suggesting onset in the second 10-day period of February. Contrary to previous claims, our data do not support prenuptial movements from Kabylie to Tunisia. Instead, sedentary behaviour in wintering areas until March is suggested by both geographical coordinates and recovery data. Satellite transmitter data confirm departure dates in March for thrushes marked in December in Italy. In summary, this study provides a concise overview of Song Thrush wintering dynamics in North Africa, offering insights into diverse migratory patterns and regional biases and challenging previously held assumptions about prenuptial movements and migration onset.

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Exploratory analyses ofmigration timing andmorphometrics of the Song Thrush (Turdus philomelos)

Cited by 3 publications

References 32 publications

Exploratory analyses ofmigration timing andmorphometrics of the Common Blackbird (Turdus merula)

Exploratory analyses ofmigration timing andmorphometrics of the Common Blackbird (Turdus merula)

Migration and wintering of Fieldfare (Turdus pilaris) in southeastern Hungary

Analysis of Ring Recoveries of Song Thrushes Turdus philomelos in North Africa

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