| Titre : | Bartel T 2023: White markings on wing and upper tail coverts of Northern Nutcrackers Nucifraga c. caryocatactes: Interpret correctly! (2023) |
| Auteurs : | Thomas Barthel, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (61(1) 2023) |
| Résumé : | During the ten-year study of the Spotted Nutcracker in the Saxon Erzgebirge, various white markings could be detected on the wing remiges. Through ringing, changes in shape and size of the white markings on the wing were recognised in recaptures after juvenile and full moult, which resulted in certain inconsistencies with available literature records. For one thing, spe-cific white markings on primary and secondary feathers as well as on greater coverts and wing bars, which proved to be confirmed by repeated control catches, are unsuitable for age determination. And secondly, suitable feather characteristics on the wing are pointed out by the author. Nevertheless, there is a certain difficulty to distinguish individuals of the second calendar year after the first annual moult from adult birds, but also birds that were hatched later in the year may show a different pattern of white markings on the median coverts. Additionally, with such late-hatched birds, juvenile and full moult could be postponed according to the normal moult cycle, which would again change the overall appearance of the wings. Examples of white markings on the individual feather parts are shown and described for a better clarification on the basis of numerous illustrations, which can either be regarded as unsuitable or suitable age criteria, to provide field ornithologists and ringers further material for age determination. Furthermore, two individuals with white triangles on the upper tail coverts were noticed among the 107 Spotted Nutcrackers examined and are presented here. This pattern may not have been described in more detail in the literature or there may be a lack of general information on the presence of these markings in identification guides. This could possibly be an indication of adaptation or a regional phenomenon of the Spotted Nutcracker, which is under discussion. |
Bibliothèque Tour du Valat
Se connecter
La Tour du Valat
Institut de recherche pour la conservation des zones humides méditerranéennes- Les publications récentes de la Tour du Valat
- Catalogue en ligne du centre de ressources
- A la une
-
Sélections
- Les écrits de Luc Hoffmann, fondateur de la Tour du Valat
- Des références récentes sur les zones humides méditerranéennes
- Quelques exemples d'impact du changement climatique sur les zones humides
- Quelques références bibliographiques sur la grippe aviaire
- Les recherches de la Tour du Valat sur le saturnisme
- De récentes publications sur la Camargue
- Le fonds Camargue de la bibliothèque
- Coordination géographique
- Nous contacter
Infos pratiques
Heures d'ouverture et contact
Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...
Liens utiles
- 1 - Le site Internet de la Fondation Tour du Valat
- 2 - La base documentaire du Pôle-relais lagunes méditerranéennes
- 3 - Le site Internet consacré aux Oiseaux d'eau en région Méditerranée
- 4 - Le site Internet ObsNature Camargue -Crau-Alpilles - recueil de données d'observations naturalistes
- 5 - Le site Internet de MedWet, l’initiative pour les zones humides méditerranéennes
