We know little about the determinants and demographic consequences of the marked seasonal mass changes exhibited by many northern and alpine mammals. We analysed 43 years of data on individual winter mass loss (the difference between mass in early June and mass in mid‐September the previous year) and summer mass gain (the difference between mass in mid‐September and in early June of the same year) in adult bighorn sheep ( Ovis...

The timing of birth has marked impacts on early life and early development of newborns in many species. In seasonal environments, early‐born offspring often survive and grow better than late‐born offspring, but despite the long‐lasting effects of early conditions on life history traits, the influence of birth date on fitness has rarely been investigated for long‐lived species. In this study, we analyzed both the short‐ and lon...

There is increasing evidence that environmental conditions experienced early in life can markedly affect an organism's life history, but the pathways by which early environment influences adult phenotype are poorly known. We used long‐term data from two roe deer ( Capreolus capreolus ) populations (Chizé and Trois‐Fontaines, France) to investigate the direct and indirect (operating through fawn body mass) effects of environmen...

How populations respond to climate change depends on the interplay between life history, resource availability, and the intensity of the change. Roe deer are income breeders, with high levels of allocation to reproduction, and are hence strongly constrained by the availability of high quality resources during spring. We investigated how recent climate change has influenced demographic processes in two populations of this wides...