S. Daan

Publications297
h-index77
Citations23,568
Highly Influential Citations1,214
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The Prudent Parent: Energetic Adjustments in Avian Breeding 1)
TLDR
Energetics of reproduction in birds is reviewed, and observations of parent starlings confronted with manipulated brood size suggest a limit on the time that can be devoted to energetically extravagant flight activity, rather than a shortage of absolute time.
Timing of human sleep: recovery process gated by a circadian pacemaker.
TLDR
The model shows that the experimental data are consistent with the concept of a single circadian pacemaker in humans, which has implications for the understanding of sleep as a restorative process and its timing with respect to day and night.
A functional analysis of circadian pacemakers in nocturnal rodents
TLDR
The strong correlation both among and within species between LL-response and shape of the phase response curve (PRC) suggests that τ is homeostatically protected in the face of alterations in LL-intensity, and species differences do not reflect differences in the homeostatic mechanism conserving frequency.
A functional analysis of circadian pacemakers in nocturnal rodents
TLDR
After-effects of “skeleton” photoperiods support the hypothesis that the transitions of light to darkness vv.
Reproductive effort decreases antibody responsiveness
TLDR
It is suggested that reduced immunocompetence as a consequence of increased reproductive effort may be an important pathway for the life history cost of reproduction.
A functional analysis of circadian pacemakers in nocturnal rodents
TLDR
The model qualitatively accommodates the interdependence of τ and α summarized in Aschoffs Rule and shows that both the split and the unsplit condition are metastable states, characterized by different phase relationships (ψEM) of two constituent oscillators.
A Functional analysis of circadian pacemakers in nocturnal rodents
TLDR
Indications are found that the response to a resetting stimulus at a given phase of the rhythm is correlated with the individual, and the functional meaning of the interrelationships of τ and PRC is briefly discussed.
Avian basal metabolic rates: their association with body composition and energy expenditure in nature.
TLDR
It is suggested that natural selection has led to an adjustment of the size of organs involved in sustaining energy metabolism at the DEE maximized during parental care and that size-independent variation in BMR reflects the relative size of this highly metabolically active machinery.
Comparison of the Munich Chronotype Questionnaire with the Horne‐Östberg's Morningness‐Eveningness score
TLDR
The study shows that chronotype (based on MSF as measured by the MCTQ) strongly correlates with morningness‐eveningness (as measured with the MEQ), however, the M CTQ collects additional detailed information on sleep‐wake behavior under natural conditions.
Extreme adaptive modification in sex ratio of the Seychelles warbler's eggs
TLDR
It is shown that biased hatching sex ratios are caused by biased production and not by differential embryo mortality, and that unhelped breeding pairs on low-quality territories produce 77% sons, whereas unhelping pairs on high- quality territories produce 13% sons.
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