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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Appearance, development of plumage and morphometric measurements in chicks of the Eurasian Oystercatcher Haematopus ostralegus from hatching to fledging (2013)
Auteurs :	Leander Khil, Auteur
Type de document :	Article
Dans :	Vogelwarte (51(1) 2013)
Article en page(s) :	47-54
Langues:	Allemand
Résumé :	The paper describes the external changes of chicks of the Eurasian Oystercatcher (Haematopus ostralegus) from hatching to fledging. The downy plumage, bill, legs and eye-ring and the growth of plumage from the first until about the 40th day of life are treated and illustrated by photos. Average weight, wing lenght, bill length and bill depth are listed for one, eighteen and thirty days old chicks. More than 40 chicks had been tagged after hatching on Hamburger Hallig/North Frisia (Schleswig- Holstein) and their development was followed therefrom. On the first day after hatching, the contrasting downy plumage dries. Legs are light pinkish at first, soon changing to bluish grey. The bill is multi-coloured white, grey and black with a pink base. Up to c. the 14th day, chicks have a light, sandy downy plumage with black markings. The egg-tooth drops on the third or fourth day. The first primaries break through on the eleventh day. The bill is now dark brownish black with orange lower mandible. From c. the 15th day onwards, the downy plumage appears much darker, caused by dark feathers developping under the downs. The contrast of black markings decreases. The bill changes colour, getting more orange and the colour of the eye-ring starts to change to dark yellow. From about the 20th day, feathers of the juvenile plumage are found on most parts of the body. Remains of the downy plumage are still obvious, especially on the head and back. The eye-ring gets all yellow and the color of legs slowly starts to change to pink. From about the 30th day, juveniles appear fully feathered, showing only few remnants of downs. The bill is orange with a darker tip and darker ridge of the upper mandible. The change of colour of the legs becomes obvious only later. From ca. the 40th day onwards, hardly any downs are visible. The juveniles are now able to fly. Their head, neck, breast and upperparts are largely dark brown and a thin, ligth collar remains. The underparts are now white.

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