Preliminary observations on the feeding habits and habitats of crossbills Loxia curvirostra balearica a la península de Formentor, Mallorca
[eng] Preliminary observations on the feeding habits and habitats of Crossbills Loxia curvirostra balearica at Cape Formentor, Majorca. A study of the feeding habits and habitats of crossbills Loxia curvirostra balearica was carried out, primarily in Aleppo Pine Pinus halepensis fo...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2003 |
| País: | España |
| Institución: | Universidad de las Islas Baleares |
| Repositorio: | Biblioteca Digital de les Illes Balears |
| OAI Identifier: | anuariGob:AOB_2003v18p003 |
| Acceso en línea: | http://ibdigital.uib.es/greenstone/sites/oai-site/collect/anuariGob/index/assoc/AOB_2003.dir/AOB_2003v18p003.pdf http://ibdigital.uib.es/greenstone/library/collection/anuariGob/document/AOB_2003v18p003 |
| Access Level: | acceso abierto |
| Palabra clave: | Birds -- Feeding and feeds -- Spain -- Balearic Islands -- Majorca (Formentor) Ornithology |
| Sumario: | [eng] Preliminary observations on the feeding habits and habitats of Crossbills Loxia curvirostra balearica at Cape Formentor, Majorca. A study of the feeding habits and habitats of crossbills Loxia curvirostra balearica was carried out, primarily in Aleppo Pine Pinus halepensis forests on Cape Formentor, Majorca in October 2002. Crossbills either removed green cones (those that would shed seeds in the following year) from live trees, or left them in situ on a fire-damaged tree, prior to prising back the scales to remove the seeds. Cones that were removed had an average length of 44.1 mm (range 28-59 mm) and most (92.6%) had all the scales prised back. Proximal scales were prised back before the distal ones. Aleppo Pine cones have thick stalks and may pose a limit to the size of cones that crossbills can remove, because cones over 90 mm in length occur. The crossbills fed in overstorey trees with an average diameter at breast height of 43 cm and height of 16.3 m. The average density of surrounding pines was 223 trees per ha. These values were similar to the available overstorey trees. |
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