Mass or pace? Seasonal energy management in wintering boreal passerines

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Research on winter energy management in small vertebrates has focused on the regulation of body mass (BM) within a framework of starvation-predation trade-off. Winter-acclimatized birds exhibit a seasonal increase in both BM and basal metabolic rate (BMR), although the patterns of co-variation between the two traits remain unknown. We studied this co-variation in three different species of wild titmice, great, blue and willow tits, originating from two boreal regions at different latitudes. Seasonal change in BM and BMR was inter-dependent, particularly in the great tit; however, by contrast, no seasonal change was observed in the willow tit. BMR changed non-linearly in concert with BM with a peak in midwinter for both blue and great tits, whereas such non-linear pattern in willow tit was opposite and independent of BM. Surprisingly, BMR appears to be more sensitive to ambient temperatures than BM in all three species studied. Energy management is a multifaceted strategy that cannot be fully understood without considering reserve levels and energy expenditure simultaneously. Thus, our study indicates that the prevailing conceptual framework based on variation in BM alone is insufficient to understand seasonal energy management in small wintering passerines.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • CSIC Estación Biológica de Doñana (EBD)
  • University of Oulu
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Evolutionsbiologi

Nyckelord

Originalspråkengelska
Sidor (från-till)339-351
TidskriftOecologia
Volym189
Utgivningsnummer2
Tidigt onlinedatum2019 jan 7
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa