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Attractiveness of women's body odors over the menstrual cycle: the role of oral contraceptives and receiver sex
- Seppo Kuukasjärvi, C. Eriksson, E. Koskela, T. Mappes, K. Nissinen, M. Rantala
- 1 July 2004
The results indicate that men can use olfactory cues to distinguish between ovulating and nonovulating women, and the contrasting results between pill users and nonusers may indicate that oral contraceptives demolish the cyclic attractiveness of odors.
Cyclic hantavirus epidemics in humans--predicted by rodent host dynamics.
Maternal antibodies postpone hantavirus infection and enhance individual breeding success
- E. Kallio, A. Poikonen, T. Mappes
- BiologyProceedings of the Royal Society B: Biological…
- 7 November 2006
This work studied the influence of maternal antibodies against the zoonotic Puumala hantavirus (PUUV) on the fitness of bank voles (Clethrionomys glareolus) and on PUUV transmission by exposing young maternal antibody-positive and negative (MatAb−) bank Voles to PUUV in experimental populations.
Quantitative measure of sexual selection with respect to the operational sex ratio: a comparison of selection indices
- S. Mills, A. Grapputo, E. Koskela, T. Mappes
- Biology, PsychologyProceedings of the Royal Society B: Biological…
- 7 January 2007
It is found that all the sexual selection indices show significant positive intercorrelations for both males and females, suggesting that Bateman's principles are an accurate and a valid measure of the mating system.
COST OF REPRODUCTION IN THE WILD: MANIPULATION OF REPRODUCTIVE EFFORT IN THE BANK VOLE
Evidence is provided that, in the wild, females may be incapable of escaping the costs of reproduction and have been considered typical income breeders, in which potential reproductive costs may be masked.
Offspring Defence in Relation to Litter Size and Age: Experiment in the Bank vole Clethrionomys glareolus
It is suggested that maternal aggression in female bank voles is related to the value as well as to the vulnerability of the offspring, supporting parental investment theory and conclusions drawn by earlier studies of birds.
Testosterone‐Mediated Effects on Fitness‐Related Phenotypic Traits and Fitness
Testing the effects of elevated T between two bank vole Myodes glareolus groups found Circulating T levels were found to be heritable; therefore, female bank voles would derive indirect genetic benefits via good genes from mating with males signaling dominance.
Endemic hantavirus infection impairs the winter survival of its rodent host.
This work examines the effect of Puumala virus (PUUV) infection on the winter survival of bank voles (Myodes glareolus), the host of this virus, to provide the first evidence for a significant effect of PUUV on host survival.
Nonlinear effects of climate on boreal rodent dynamics: mild winters do not negate high‐amplitude cycles
It is found that the temporal patterns in cyclicity varied between climatically different regions: a transient reduction in cycle amplitude in the coldest region, low-amplitude cycles or irregular dynamics in the climatically intermediate regions, and strengthening cyclicity in the warmest region.
FITNESS TRADE‐OFFS MEDIATED BY IMMUNOSUPPRESSION COSTS IN A SMALL MAMMAL
- S. Mills, A. Grapputo, I. Jokinen, E. Koskela, T. Mappes, Tanja Poikonen
- BiologyEvolution; international journal of organic…
- 1 January 2010
Significant heritability of immune response was found and a correlated response in testosterone levels to selection on immune function was found, indicating an evolutionary constraint on fitness traits.