6 Works

Data from: Independence among physiological traits suggests flexibility in the face of ecological demands on phenotypes

Deborah M. Buehler, Francois Vézina, Wolfgang Goymann, Ingrid Schwabl, Maaike Versteegh, B. Irene Tieleman & Theunis Piersma
Phenotypic flexibility allows animals to adjust their physiology to diverse environmental conditions encountered over the year. Examining how these varying traits covary gives insights into potential constraints or freedoms that may shape evolutionary trajectories. In this study we examined relationships among hematocrit, baseline corticosterone concentration, constitutive immune function and basal metabolic rate in red knot Calidris canutus islandica individuals subjected to experimentally manipulated temperature treatments over an entire annual cycle. If covariation among traits is...

Data from: Migratory constraints on yolk precursors limit yolk androgen deposition and underlie a brood reduction strategy in rockhopper penguins

Glenn T. Crossin, Maud Poisbleau, Laurent Demongin, Olivier Chastel, Tony D. Williams, Marcel Eens & Petra Quillfeldt
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspring phenotype. The production of lipid-rich maternal yolk precursors may provide a mechanism by which lipophilic steroid hormones can be transported to developing yolks, thus predicting a positive correlation between yolk precursors in mothers and androgen levels in eggs. Using rockhopper penguins (Eudyptes chrysocome), which produce a two-egg clutch characterized by extreme egg-size dimorphism, reversed hatching asynchrony and brood-reduction, we examined correlations between circulating...

Data from: Sex chromosome linked genetic variance and the evolution of sexual dimorphism of quantitative traits

Arild Husby, Holger Schielzeth, Wolfgang Forstmeier, Lars Gustafsson & Anna Qvarnström
Theory predicts that sex chromsome linkage should reduce intersexual genetic correlations thereby allowing the evolution of sexual dimorphism. Empirical evidence for sex linkage has come largely from crosses and few studies have examined how sexual dimorphism and sex linkage are related within outbred populations. Here we use data on an array of different traits measured on over 10,000 individuals from two pedigreed populations of birds (collared flycatcher and zebra finch) to estimate the amount of...

Data from: Heterozygosity-fitness correlations in zebra finches: microsatellite markers can be better than their reputation

Wolfgang Forstmeier, Holger Schielzeth, Jakob C. Mueller, Hans Ellegren & Bart Kempenaers
Numerous studies have reported associations between heterozygosity in microsatellite markers and fitness-related traits (heterozygosity-fitness correlations, HFCs). However, it has often been questioned whether HFCs reflect general inbreeding depression, because a small panel of microsatellite markers does not reflect very well an individual’s inbreeding coefficient (F) as calculated from a pedigree. Here we challenge this prevailing view. Due to chance events during Mendelian segregation, an individual’s realized proportion of the genome that is identical by descent...

Data from: QTL and quantitative genetic analysis of beak morphology reveals patterns of standing genetic variation in an Estrildid finch

Ulrich Knief, Holger Schielzeth, Bart Kempenaers, Hans Ellegren & Wolfgang Forstmeier
The intra- and interspecific diversity of avian beak morphologies is one of the most compelling examples for the power of natural selection acting on a morphological trait. The development and diversification of the beak has also become a textbook example for evolutionary developmental biology, and variation in expression levels of several genes is known to causally affect beak shape. However, until now no genomic polymorphisms have been identified that are related to beak morphology in...

Data from: Do immunological, endocrine and metabolic traits fall on a single Pace-of-Life axis? Covariation and constraints among physiological systems

Maaike A. Versteegh, I. Schwabl, Sophie Jacqier, B. Irene Tieleman & S. Jaquier
Variation in demographic and physiological attributes of life-history is thought to fall on one single axis, a phenomenon termed the Pace-of-Life. A slow Pace-of-Life is characterized by low annual reproduction, long life span and low metabolic rate, a fast Pace-of-Life by the opposite characteristics. The existence of a single axis has been attributed to constraints among physiological mechanisms that are thought to restrict evolutionary potential. In that case, physiological traits should covary in the same...

Registration Year

  • 2012

Resource Types

  • Dataset


  • Max Planck Institute for Ornithology
  • Uppsala University
  • University of Groningen
  • University of Antwerp
  • Dalhousie University
  • Center for Northern Studies
  • Simon Fraser University
  • French National Centre for Scientific Research
  • Bielefeld University
  • University of Toronto