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Juvenile Dispersal of Spanish Imperial Eagles

AuthorsGonzález, Luis Mariano; Heredia, Borja; González, José L.; Alonso López, Juan C.
Issue Date1989
CitationJournal of Field Ornithology, 60(3) : 369-379 (1989)
Abstract[EN] Postfledging dispersal of juvenile Spanish Imperial Eagles (Aquila adalberti) was studied from 51 records of recoveries, sightings, and contacts with banded, and wing or radio-tagged birds. When they become independent young eagles leave their natal areas, travelling up to 350 km. Dispersal can be divided into three phases (1) exploratory flights with return to the natal area, (2) long distance trips away from the natal area during which some birds establish temporary territories in areas of apparent food abundance, and (3) return to the vicinity of the natal area. During dispersal the young suffered high mortality, which is attributed to the risks of dispersion "per se" and the lack of familiarity with the new areas they explore. The distance between natal areas and recoveries first increased and then decreased with age, the birds tending to return to the areas where they were born, a fact probably related to marked philopatry in this species. However, there is evidence of at least one individual breeding in an area different from its place of birth, which suggests that there is some genetic exchange among the different sub-populations
[ES] En base a 51 registros de avistamientos, contactos de individuos anillados o con radiotransmisores y recapturó de aves se estudias el patrón de dispersión de jóvenes de Aquila adalberti. Cuando los jóvenes se independizan, dejan sus áreas natales y viajan distancias hasta de 350 km. El patrón de dispersión se puede dividir en tres fases. Jóvenes: (1) vuelos exploratorios con regreso a su área natal, (2) largos vuelos fuera del área natal en donde las aves establecen territorios temporeros en lugares con aparente abundancia de alimento y (3) regreso a la vecindad del área natal. Durante la dispersión los jóvenes sufren una alta mortalidad, atribuida a los riesgos de la dispersión per se y a la falta de familiaridad con las áreas que exploran. Las distancias entre las áreas natales y lugares de recuperación de jóvenes, aumenta y luego disminuye con la edad de las aves. Hay una tendencia a regresar a los lugares natales, probablemente debido a la marcada filopatría en la especie. Sin embargo, hay evidencia de al menos un individuo, que se reprodujo en un área diferente a la que nació, lo que sugiere un cierto intercambio genético entre diferentes sub-poblaciones
Description11 paginas, 3 figuras y 1 table
Publisher version (URL)http://www.jstor.org/stable/4513455
Appears in Collections:(MNCN) Artículos
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