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Katarzyna Rosińska and Karolina Adamska

Biometrics Variation and Directional Preferences of Immature Robins (Erithacus rubecula) Caught in Northern Italy during Autumn Migration in 2005

Inter-seasonal changes of biometry and preferred migration directions of Robins were studied according to data collected during autumn migration in northern Italy at the Arosio Bird Observatory (45°43'N, 9°12'E). Altogether 598 immature Robins were caught and 187 orientation tests were performed. Wing, tail and tarsus length, wing shape and weight were analysed in subsequent five migration waves distinguished according to migration dynamics. General pattern of migration as well as graphs with distribution of preferred directions in subsequent waves were prepared. In the case of tail length and weight their average values in subsequent waves were significantly different. Decrease of wing length was noted along the season. On the contrary, increasing trend was observed in the case of tail length and wing shape. Results of orientation tests showed that SSE direction was predominant (34%). SW direction was not clearly marked and its percentage was 23%. Distribution of directions slightly changed in subsequent migration waves. Noted results suggest passage of Robins heading to the Mediterranean basin and Apennine winter quarters. Obtained inter-seasonal changes of biometry and preferred directions can be an effect of differences in migration time between this groups or gradual inflow of more northern populations what the authors discuss here.

Open access

Karolina Adamska and Monika Filar

Directional Preferences of the Chiffchaff (Phylloscopus collybita) and the Robin (Erithacus rubecula) on Autumn Migration in the Beskid Niski Mountains (S Poland)

Data were collected at the "Akcja Carpatica" ringing station in the southern Poland in 2000-2003. In total 388 Robins and 357 Chiffchaffs were tested with the Busse's method (Busse 1995) for directional preferences during autumn migration. The data were elaborated using a non-standard calculation procedure proposed by Busse and Trocińska (1999) that could be applied to multimodal circular distributions.

Tested birds showed ca 69% (the Chiffchaff) and more than 60% (the Robin) of northern headings that we called "reversed directions" for autumn migration. We applied "reversing procedure", i.e. adding 180° to all northern directions. Such procedure was based on an assumption that birds show axial behaviour in the cage.

The species seasonal catching dynamics was divided into periods reflecting migration waves. Both studied species showed differentiation of directional preferences. In the Robin such directions as: SSE, SSW, ESE and WSW were noted. Most clear migration pattern was observed for the Chiffchaff — SSE and WSW directions dominated.

Although in both species sampling was short and irregular, the Chiffchaff migration pattern was clear and similar in all studied seasons. On the contrary, the Robin showed complicated and difficult to analyse headings' distributions. Robins indicated both intra- and interseasonal differentiation of directional preferences.

Open access

Karolina Adamska and Katarzyna Rosińska

Directional Preferences of the Robin (Erithacus rubecula) and the Blackcap (Sylvia atricapilla) During Autumn Migration at Arosio (N Italy) in 2005

Results of orientation tests of nocturnal migrants with the use of Busse's cage (Busse 1995, Busse 2000) are described in this paper. That method enables to study directional behaviour of nocturnal migrants during daytime. The aim of these studies is the description of directional preferences of the Robin and the Blackcap at the ringing station Arosio, northern Italy. Totally, 220 orientation tests for the Robin and 77 for the Blackcap were performed. Tested species have shown differentiation of directional preferences. Distribution of directions for the Robin is very clear. One direction was preferred - SSE direction (34%). For the Blackcap the distribution of headings was more complex, but two main directions could be distinguished - SSW (23%) and WSW (22%). Migration patterns of both these species in Europe are complicated. Birds migrating through northern Italy should be regarded as different migrating populations (Remisiewicz 2002, Mokwa 2004). However, migration pattern of the Robin was strongly determinated in one SSE direction, which indicates the Apennine Peninsula. Blackcap followed two directions, which indicate western winter quarters. Obtained results stood in accordance with other data, such as recoveries. Although the obtained results seem to be very interesting and promising, only intensive studies, especially in areas indicated by tested birds, could give information about migration pattern of these species.

Open access

Monika Filar, Karolina Adamska and Marek Jędra

Ringing Results of the Carpatica Ringing Station (S Poland) in 1998-2005

The Carpatica ringing station is located at Myscowa, in the centre of the Beskid Niski Mountains, in southern Poland. The ringing site has been operating since 1998 and since 2000 it has belonged to the SEEN (SE European Bird Migration Network) — an international organization for institutions that study bird migration. The Carpatica ringing station is situated on the south-eastern migration flyway crossing the Carpathian Mountains. Totally, 29 869 birds out of 92 different species, mainly passerines were ringed in 1998-2005. Station location and biotopes, species composition of captured birds, field work methods and results are described in the paper.