LOW LEVELS OF ENERGY EXPENDITURE IN A NOCTURNAL, FOREST-DWELLING WADER, THE EURASIAN WOODCOCK SCOLOPAX RUSTICOLA

摘要: Ecological energetics have been extensively studied in the Scolopacidae, but mostly focused on coastal and wetland species. Living forests meadows, Eurasian Woodcock Scolopax rusticola (mean body mass 317 g) is an exceptional species among waders. Standard Metabolic Rate (SMR, including Basal (BMR) thermoregulation costs, measured at rest a respirometer chamber) T3 hormone levels were wild woodcocks wintering France. While Lower Critical Temperature followed predictions from allometric equations (17.5°C), BMR was low (1.2 W) plumage insulation high compared with other shorebirds. positively correlated SMR laboratory. In field, we used to predict Field (FMR); winter average FMR around 2.8 times (3.4 W). The energetic requirements of are lower than those typical waders living windy unsheltered habitats, which turn may lead their BMR. Woodcocks could save energy by resting during day sheltered habitat being active night, when costs for higher.