| Titre : | Effects of supplementary feeding on the C-egg constituents in the nominate lesser black-backed Gull Larus f. fuscus |
| Auteurs : | M. Hario, Auteur |
| Type de document : | Article |
| Dans : | Ornis Fennica (74(4) 1997) |
| Article en page(s) : | 167-177 |
| Langues: | Anglais |
| Résumé : | Providing extra food next to the nest of laying Lesser Black-backed Gulls of the nominate race Larus f. fuscus in the Gulf of Finland did not result in differential Lipid, nitrogen or protein proportions in the C-egg compared with a control group of similar median laying date. The amount of extra food received varied among females, but the relative size of the C-egg was not positively correlated (the volume of the C-egg in relation to that of the A-egg). The courtship feeding rate correlated positively with the female territory attendance, i.e. females that spent much time at the territory received many courtship feedings. This was because their success in soliciting feedings was high compared with those that were often absent (as measured by the number of female beggings/released feeds by the male). Hence, being absent might be a consequence of a low courtship feeding rate rather than the reason for it. Whatever the case, long absence and a low courtship feeding rate did not lead to a decrease in egg-size asymmetry, rather, the contrary. It is concluded that foraging independently may be a more important option for a laying female than a heavy reliance on the male's courtship feeding activity, especially under benign foraging conditions. The supplementary feeding regime had little discernible effect on the feeding behaviour of gulls, which might be a further indication of locally plentiful food stocks (i.e. Baltic Herring Clupea harengus). |
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
