DOI: 10.5061/dryad.pnvx0k6sk
title: Data from: Glucocorticoids negatively relate to body mass on the short-term in a free-ranging ungulate

description: Environmental fluctuations force animals to adjust glucocorticoids (GCs)
 secretion and release to current conditions. GCs are a widely used proxy
 of an individual stress level. While short-term elevation in GCs is
 arguably beneficial for fitness components, previous studies have
 documented that the relationship between long-term baseline GCs elevation
 and fitness components can vary according to ecological and individual
 factors and according to the life-history of the species studied. Using
 longitudinal data on roe deer (Capreolus capreolus) from two populations
 facing markedly different environmental contexts, we tested whether
 baseline GC levels negatively correlate with body mass – a trait
 positively associated with demographic individual performance – on the
 short- to long-term. In support, higher baseline GC concentrations were
 associated to lighter body mass, both measured during the same capture
 event, in adults of both populations. Overall, we showed that despite the
 marked environmental and demographic differences between populations and
 despite the between-sex differences in life history (i.e. reproductive
 tactics), the relationship between body mass and GCs is consistent across
 environmental contexts, but might differ according to the life history
 stage of an individual. This work opens promising perspectives to further
 explore the relationship between GC and fitness-related traits according
 to life history stages in free-ranging mammals across seasonal and
 environmental contexts. The timing and context-dependence of GC levels
 highlight the complexity of studying stress responses in the wild.
description: # Data from: Glucocorticoids negatively relate to body mass on the
 short-term in a free-ranging ungulate ## Project description Using
 longitudinal data on roe deer *Capreolus capreolus* from two populations
 facing markedly different environmental contexts, we tested whether
 baseline GC levels negatively correlate with body mass – a trait
 positively associated with demographic individual performance – on the
 short- to long-term. In support, higher baseline GC concentrations were
 asso- ciated to lighter body mass, both measured during the same capture
 event, in adults of both populations. Overall, we showed that despite the
 marked environmental and demographic differences between populations and
 despite the between-sex differences in life history (i.e. reproductive
 tactics), the relationship between body mass and GCs is consistent across
 environmental contexts, but might differ according to the life his- tory
 stage of an individual. ## Dataset File:
 dataset_roedeer_fgm_mass_anonym.csv The deposit contains the anonymised
 dataset to replicate the article mentioned above. It includes: * idkit:
 the ID of the kit used for sampling * numind: Roe deer ID * pop:
 Population (3F: Trois-Fontaines, C: Chizé) * cohorte: cohort *
 qualite_cohorte: cohort environmental quality defined as the mean fawn
 mass standardised for the date of capture * sexe: sex * annee: year of
 capture * datejulienne: Julian date of capture * qualite_an: year of
 capture environmental quality defined as the mean fawn mass standardised
 for the date of capture * ageannee: age (years) * masse: mass (kg) *
 id_bioch: ID for biochemical analyses * dureemin: time between capture and
 sampling (min) * neutroP: Proportion of neutrophil * lymphoP: Proportion
 of lymphocyte * FGM_Priority: Whether faecal sampling is prioritize
 towards stress analyses or other analyses (nutrition, parasitism, ...) *
 FGMngg: FGM levels (ng/g) * NA values indicates that no measurements could
 be performed on the field or that the age or year of birth (cohort) of an
 individual was unknown because it has not been captured as fawn or
 juvenile ## Contact: For all queries: Lucas D. Lalande -
 [lalande.luke@gmail.com](mailto:lalande.luke@gmail.com)