Bernd Riedstra
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View article: The female red jungle fowl (Gallus gallus gallus) reproductive investment stimulated by male attractiveness
The female red jungle fowl (Gallus gallus gallus) reproductive investment stimulated by male attractiveness Open
Lelono A, Riedstra B, Groothuis T. 2024. The female red jungle fowl (Gallus gallus gallus) reproductive investment stimulated by male attractiveness. Biodiversitas 25: 2931-2936. To maximize their capacity for reproduction, mothers are exp…
View article: Effects of maternal androgens and their metabolite etiocholanolone on prenatal development in birds
Effects of maternal androgens and their metabolite etiocholanolone on prenatal development in birds Open
Offspring phenotypes can be affected by maternal testosterone and androstenedione (A4), which are considered a tool of mothers to adjust offspring to a fluctuating environment. Yet testosterone and A4 are very rapidly metabolized by develo…
View article: Are lateralized and bold fish optimistic or pessimistic?
Are lateralized and bold fish optimistic or pessimistic? Open
Cognitive bias is defined as the influence of emotions on cognitive processes. The concept of the cognitive judgement bias has its origins in human psychology but has been applied to animals over the past 2 decades. In this study we were i…
View article: Effects of early predation and social cues on the relationship between laterality and personality
Effects of early predation and social cues on the relationship between laterality and personality Open
Individual differences in laterality and personality are expected to covary, as emotions are processed differently by the two hemispheres, and personality involves emotional behavior. Fish species are often used to investigate this topic d…
View article: The effect of light during embryonic development on laterality and exploration in Western Rainbowfish
The effect of light during embryonic development on laterality and exploration in Western Rainbowfish Open
Several factors affect the development of lateralization such as hormones and light exposure during early development. Laterality also often correlates with other behavioral traits. To examine whether there is a common mechanism underlying…
View article: Dynamics of maternal androgens and its metabolites during early embryonic development: embryonic modification of a maternal effect
Dynamics of maternal androgens and its metabolites during early embryonic development: embryonic modification of a maternal effect Open
In birds, exposure to maternal (yolk) testosterone affects a diversity of offspring post-hatching traits, which eventually affect offspring competitiveness. However, maternal testosterone is heavily metabolized at very early embryonic deve…
View article: Early conversion of maternal androgens affects the embryo already in the first week of development
Early conversion of maternal androgens affects the embryo already in the first week of development Open
Maternal androgen exposure has potent effects on offspring development. As substantial levels of maternal androgens are deposited in avian egg yolks, avian eggs are frequently used to study maternal effects, with a strong focus on post-nat…
View article: Embryonic heart rate is affected by yolk androgens and egg laying sequence, and correlates with embryonic tissue growth: A study in rock pigeons
Embryonic heart rate is affected by yolk androgens and egg laying sequence, and correlates with embryonic tissue growth: A study in rock pigeons Open
Maternal androgen exposure can have crucial effects on offspring development. Bird eggs are frequently used for studying these effects and virtually all research in this field has focused on post-hatching offspring traits. Yet, much of the…
View article: Pigeons_shellless_data(raw) from Early conversion of maternal androgens affects the embryo already in the first week of development
Pigeons_shellless_data(raw) from Early conversion of maternal androgens affects the embryo already in the first week of development Open
raw data used in this manuscript
View article: Differential temperature effects on photoperiodism in female voles: A possible explanation for declines in vole populations
Differential temperature effects on photoperiodism in female voles: A possible explanation for declines in vole populations Open
Many mammalian species use photoperiod as a predictive cue to time seasonal reproduction. In addition, metabolic effects on the reproductive axis may also influence seasonal timing, especially in female small, short‐lived mammals. To get a…
View article: Differential temperature effects on photoperiodism in female voles: An explanation for species-specific declines in vole populations
Differential temperature effects on photoperiodism in female voles: An explanation for species-specific declines in vole populations Open
Many mammalian species use photoperiod as a predictive cue to time seasonal reproduction. In addition, metabolic effects on the reproductive axis may also influence seasonal timing, especially in female small, short-lived mammals. To get a…
View article: Is imitational learning a driving factor for the population bias in human hand preference?
Is imitational learning a driving factor for the population bias in human hand preference? Open
Lateral preference is a widespread organizational principle in human and nonhuman animals. In humans, the most apparent lateralized trait (handedness) is unique in the animal kingdom because of a very pronounced bias towards right-handedne…
View article: The importance of understanding function and evolution
The importance of understanding function and evolution Open
Ocklenburg et al. (2020, Laterality 2020: Entering the next decade. Laterality) provided the field of laterality research with a stimulating research perspective for the coming decade, based on the current state of the art in both animal a…
View article: Practice of Noseband Use and Intentions towards Behavioural Change in Dutch Equestrians
Practice of Noseband Use and Intentions towards Behavioural Change in Dutch Equestrians Open
Understanding equestrians’ noseband tightening practices and intentions is necessary to target welfare improvement strategies. Firstly, we measured tightness in dressage and show jumping horses in The Netherlands, shortly after implementat…
View article: Does paternal immunocompetence affect offspring vulnerability to maternal androgens? A study in domestic chickens
Does paternal immunocompetence affect offspring vulnerability to maternal androgens? A study in domestic chickens Open
Exposure of yolk androgens can positively stimulate chick growth and competitive ability, but may negatively affect immunity. It has been hypothesized that only chicks from immunologically superior fathers can bear the cost of prenatal exp…
View article: Ejaculate testosterone levels affect maternal investment in red junglefowl (Gallus gallus gallus)
Ejaculate testosterone levels affect maternal investment in red junglefowl (Gallus gallus gallus) Open
Substantial concentrations of testosterone are not only present in a male’s circulation, but also in its ejaculate. Surprisingly, the regulation of ejaculate T and its effects on females and their offspring, potentially a cryptic paternal …
View article: <i>In ovo</i> testosterone treatment reduces long‐term survival of female pigeons: a preliminary analysis after nine years of monitoring
<i>In ovo</i> testosterone treatment reduces long‐term survival of female pigeons: a preliminary analysis after nine years of monitoring Open
Summary Early exposure to steroid hormones, as in the case of an avian embryo exposed yolk testosterone, can impact the biology of an individual in different ways over the course of its life. While many early‐life effects of yolk testoster…