The relationship between body mass and some weather variables in Blackcaps Sylvia atricapilla wintering in orange groves in south-eastern Spain

• Autores: Ignacio G. Peiró
• Localización: Butlletí del Grup Català d'Anellament, ISSN 1130-2070, Vol. 17, Nº. 1, 2000, págs. 25-30
• Idioma: inglés
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• Resumen

  • The body mass and fat score of Blackcaps Sylvia atricapilla wintering in suburban orange groves in south-eastern Spain was studied in relation to some environmental factors (temperature, precipitation and photoperiod) using stepwise multiple regressions. Analyses were carried out on average values for the different individuals trapped within the same day to avoid pseudo-replication. The variation in body mass was significantly predicted by mean temperature on day of capture, mean temperature five days before capture and minimum temperature two days before capture (R2 = 0.980; p = 0.001). Fat score was significantly related to maximum temperature on day of capture (R2 = 0.822; p = 0.002). Temperature seems to play an important role as a proximate or short-term factor in the regulation of body mass of Blackcaps wintering in SE Spain.