Individual variation in the over-summering areas of immature Short-toed Snake Eagles Circaetus gallicus

• Autorzy: Yanez B. , Munoz A.-R. , Bildstein K. L. , Newton I. , Toxopeus A. G. , Ferrer M.

Warianty tytułu

PL

Zmienność osobnicza w geograficznej lokalizacji terenów użytkowanych w okresie letnim przez niedojrzałe płciowo gadożery

• Języki publikacji: EN

Abstrakty

EN

Satellite tracking is an invaluable tool in the study of bird movements. However, the normally small sample size it involves makes it difficult to obtain data spanning the entire range of migratory behaviour found in particular populations. We recently reported that Spanish immature Short-toed Snake Eagles leave their winter quarters in sub- Saharan Africa to occupy summering areas in northern Africa (north of the Sahara), in contrast to previously reported behaviour of a young French eagle which remained during the summer in the sub-Saharan wintering range. A more recent increase in the sample size of tracked young snake eagles further extends our knowledge of the summering behaviour of this species with one immature reaching the European range but occupying four widely-separated areas during the course of the summer. In the short-term, technology progress may provide the normal use of representative samples to increase accuracy in movement ecology studies.

PL

Pierwsze dane dla młodych, niedojrzałych płciowo gadożerów sugerowały, że spędzają one okres lata na terenach zimowisk w subsaharyjskiej Afryce. Nowsze dane pokazywały, że mogą one opuszczać zimowiska i okres wiosny i lata spędzać w północnej Afryce ponownie wracając jesienią na tereny zimowisk. W pracy prezentowane są dane dla dwóch osobników pochodzących z Hiszpanii, które po okresie zimy wróciły na szeroko rozumiane tereny lęgowisk tego gatunku, wyznaczone w pracy przez 31 równoleżnik (Fig. 1). Młoda samica odleciała jesienią do Mali, a następnie na okres lata (3 miesiące) powróciła na północ — do Algierii. Młody samiec po spędzeniu zimy w Mauretanii wrócił do Europy przemieszczając się po półwyspie Iberyjskim, zatrzymując się na dłużej na czterech terenach (Tab. 1, Fig. 1). Jesienią oba ptaki wróciły ponownie na tereny zimowisk tego gatunku. Zwiększenie liczby ptaków śledzonych przy pomocy telemetrii satelitarnej, wskazuje, że strategie migracyjne tego i innych gatunków są bardziej złożone niż wydawało się do tej pory.

Słowa kluczowe

EN

individual variation; over-the-summering area; immature animal; Short-toed Eagle; Circaetus gallicus; summering behaviour; migration; satellite tracking

• Wydawca: -
• Czasopismo: Acta Ornithologica
• Rocznik: 2014
• Tom: 49
• Numer: 1
• Opis fizyczny: p.137-141,fig.,ref.

Twórcy

autor

Yanez B.

• Migres Foundation, N-340, Km. 96.2. Huerta Grande, Pelayo E-11390 Algeciras, Cadiz, Spain

autor

Munoz A.-R.

• Migres Foundation, N-340, Km. 96.2. Huerta Grande, Pelayo E-11390 Algeciras, Cadiz, Spain
• Department of Didactic of Mathematics, Social Sciences and Experimental Sciences, Faculty of Education Sciences, University of Malaga, E-29071, Malaga, Spain

autor

Bildstein K. L.

• Acopian Center for Conservation Learning, Hawk Mountain Sanctuary, 410 Summer Valley Rd., Orwigsburg, PA 17961, USA

autor

Newton I.

• Centre for Ecology and Hydrology, Benson Lane, Crowmarsh Gifford, Wallingford, OX10 8BB, United Kingdom

autor

Toxopeus A. G.

• Department of Natural Resources, Faculty of Geo-information Science and Earth Observation (ITC), University of Twente, The Netherlands

autor

Ferrer M.

• Department of Ethology and Biodiversity Conservation, Estacion Biologica de Donana, CSIC. C/ Americo Vespucio, s/n. E-41092 Sevilla, Spain

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Identyfikatory

DOI

10.3161/000164514X682968