title: Carry-Over or Compensation? The Impact of Winter Harshness and Post-Winter Body Condition on Spring-Fattening in a Migratory Goose Species.
abstract: Environmental conditions at one point of the annual cycle of migratory species may lead to cross-seasonal effects affecting fitness in subsequent seasons. Based on a long-term mark-resighting dataset and scoring of body condition in an arctic breeding goose species, we demonstrate a substantial effect of winter harshness on post-winter body condition. However, this effect was compensated along the spring migration corridor, and did not persist long enough to influence future reproduction. This highlights the importance of temporal scale when assessing impacts of environmental effects, and suggests a state-dependent physiological mechanism adjusting energy accumulation according to internal energy stores carried into spring. In support of these findings, the development of body condition was unaffected by whether geese used supplementary feeding sites or not. While there was no effect of winter harshness on the average population pre-breeding body condition, individual variations in early spring body condition (probably related to different life-histories) were partly traceable throughout spring. This strongly indicates a carry-over effect on the individual level, possibly related to differences in dominance, site use, disturbance or migration strategy, which may potentially affect future reproduction.
authors.affiliation: Aarhus University, Department of Bioscience, Grenåvej 14, 8410, Rønde, Denmark.
authors.forename: Kevin K
authors.initials: KK
authors.lastname: Clausen
authors.affiliation: Aarhus University, Department of Bioscience, Grenåvej 14, 8410, Rønde, Denmark.
authors.forename: Jesper
authors.initials: J
authors.lastname: Madsen
authors.affiliation: Norwegian Institute for Nature Research, Department of Arctic Ecology, Fram Center, N-9296, Tromsø, Norway.
authors.forename: Ingunn M
authors.initials: IM
authors.lastname: Tombre
mesh_terms: D000064:Acclimatization / Q000502:physiology; D050154:Adiposity; D000821:Animal Feed; D025041:Animal Migration; D000818:Animals; D003080:Cold Temperature; D003718:Denmark; D002523:Edible Grain; D004734:Energy Metabolism; D005247:Feeding Behavior / Q000502:physiology; D005260:Female; D005777:Geese / Q000033:anatomy & histology / Q000502:physiology*; D008297:Male; D012098:Reproduction; D012621:Seasons