nieuwe zoekopdracht
[ meld een fout in dit record ]mandje (0): toevoegen | toon Print deze pagina

Red knots (Calidris canutus islandica) manage body mass with dieting and activity
Mathot, K.J.; Kok, E.M.A.; van den Hout, P.J.; Dekinga, A.; Piersma, T. (2020). Red knots (Calidris canutus islandica) manage body mass with dieting and activity. J. Exp. Biol. 223(21): jeb231993. https://doi.org/10.1242/jeb.231993

Bijhorende info:
In: Journal of Experimental Biology. Cambridge University Press: London. ISSN 0022-0949; e-ISSN 1477-9145, meer
Peer reviewed article  

Beschikbaar in  Auteurs 
  • NIOZ: NIOZ Open Repository - postprints 355526 [ beschikbaar vanaf 03/05/2021 ]
  • NIOZ: NIOZ files 355397

Author keywords
    Activity; Diet; Food quality; Mass loss; Mass regulation in birds

Auteurs  Top 
  • Mathot, K.J., meer
  • Kok, E.M.A., meer
  • van den Hout, P.J., meer

Abstract
    Mass regulation in birds is well documented. For example, birds can increase body mass in response to lower availability and/or predictability of food and decrease body mass in response to increased predation danger. Birds also demonstrate an ability to maintain body mass across a range of food qualities. Although the adaptive significance of mass regulation has received a great deal of theoretical and empirical attention, the mechanisms by which birds achieve this have not. Several non-exclusive mechanisms could facilitate mass regulation in birds. Birds could regulate body mass by adjusting food intake (dieting), activity, baseline energetic requirements (basal metabolic rate), mitochondrial efficiency or assimilation efficiency. Here, we present the results of two experiments in captive red knots (Calidris canutus islandica) that assess three of these proposed mechanisms: dieting, activity and up- and down-regulation of metabolic rate. In the first experiment, knots were exposed to cues of predation risk that led them to exhibit presumably adaptive mass loss. In the second experiment, knots maintained constant body mass despite being fed alternating high- and low-quality diets. In both experiments, regulation of body mass was achieved through a combination of changes in food intake and activity. Both experiments also provide some evidence for a role of metabolic adjustments. Taken together, these two experiments demonstrate that fine-scale management of body mass in knots is achieved through multiple mechanisms acting simultaneously.

Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid Top | Auteurs 
IMIS is ontwikkeld en wordt gehost door het VLIZ, voor meer informatie contacteer .