| Titre : | Diet of the red-backed shrike Lanius collurio in Bulgaria |
| Auteurs : | Boris P. Nikolov, Auteur |
| Type de document : | Article |
| Dans : | Acrocephalus (23(110-11) 2002) |
| Article en page(s) : | 21-26 |
| Résumé : | The diet of the Red-backed Shrike Lanius collurio was studied from pellets and food remains collected beneath perches, as well as from food samples obtained from nestlings, using neck collars, during the breeding season (May - July), in 1995 - 1997. The following parameters of 23 pellets were established (mm): 17.4 x 7.7 (12.0 - 27.7 x 6.5 - 9.0). A total of 377 prey items belonging to 59 taxa were found. Invertebrates were represented mainly by insects Insecta (94.72%) Spiders Aranea were also identified (3.4 %), harvestmen Opiliones (0.80 worms Lumbricomorpha, snails Gastropoda and millipedes Juliformia, 0.27 % each. Vertebrates (Common Vole Microtus arvalis) comprised 0.27 % of total prey. The most varied elements of the prey were beetles Coleoptera (41.11 % of all prey items): at least 11 families were established. Almost half the beetles (48 %) were Scarabaeidae and Carabidae species. In comparison with adult birds, soft and non-sclerotized prey predominated in the nestlings' diet: Aranea (6.8 versus 3.6 %), Lepidoptera caterpillars (5.8 vs. 1.8 %), Opiliones (1.9 vs. 0 %), and Lumbricomorpha (1.0 vs. 0 %). The results for the adults diet could be underestimated, while it is difficult to identify the above-mentioned organisms in the remains In pellets. Some taxa were found only in the nestlings' food: Opiliones, Juliformia, Lumbricomorpha and, surprisingly, rodents Rodentia. Remains of Gastropoda were found only in adults' diet. |
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