A5090497565- Animal Behavior and Reproduction
- Avian ecology and behavior
- Plant and animal studies
- Neurobiology and Insect Physiology Research
- Evolutionary Psychology and Human Behavior
- Animal Vocal Communication and Behavior
- Insect and Pesticide Research
- Insect Utilization and Effects
- Bird parasitology and diseases
- Insect and Arachnid Ecology and Behavior
- Evolutionary Game Theory and Cooperation
- Wildlife Ecology and Conservation
- Insect symbiosis and bacterial influences
- Invertebrate Immune Response Mechanisms
- Insect behavior and control techniques
- Ecology and Vegetation Dynamics Studies
- Animal Ecology and Behavior Studies
- Physiological and biochemical adaptations
- Psychology of Moral and Emotional Judgment
- Species Distribution and Climate Change
- Stress Responses and Cortisol
- Viral Infections and Vectors
- Marine animal studies overview
- Insect-Plant Interactions and Control
- Primate Behavior and Ecology
University of Tartu
2016-2025
University of Latvia
2017-2025
Daugavpils University
2016-2025
Latvian Biomedical Research and Study Centre
2020-2025
University of Tennessee at Knoxville
2015-2025
Institute of Food Safety, Animal Health and Environment “BIOR”
2015-2025
University of Turku
2008-2022
Google (United States)
2017
Austin Peay State University
2015
Pedagogical University
1998
Secondary sexual traits that develop under the action of testosterone, such as masculine human male facial characteristics, have been proposed to signal strength immune system due sex hormone's immunosuppressive action. Recent work has suggested glucocorticoid stress hormones may also influence expression signals their effects on function. Precise roles, however, remain unclear. Here we show positive relationships between attractiveness and function (antibody response a hepatitis B vaccine)...
According to the ‘good genes’ hypothesis, females choose males based on traits that indicate male's genetic quality in terms of disease resistance. The ‘immunocompetence handicap hypothesis’ proposed secondary sexual serve as indicators male quality, because they can contend with immunosuppressive effects testosterone. Masculinity is commonly assumed such a trait. Yet, women do not consistently prefer masculine looking men, nor masculinity related health across studies. Here, we show...
Abstract The strength of sexual selection on secondary traits varies depending prevailing economic and ecological conditions. In humans, cross-cultural evidence suggests women’s preferences for men’s testosterone dependent masculine facial are stronger under conditions where health is compromised, male mortality rates higher development higher. Here we use a sample 4483 exclusively heterosexual women from 34 countries employ mixed effects modelling to test how social, variables predict...
Animals can acquire behaviours from others, including heterospecifics, but should be discriminating in when and whom to copy. Successful individuals preferred as tutors, while adopting traits of poorly performing actively avoided. Thus far it is unknown if such adaptive strategies are involved copy other species. Furthermore, rejection based on tutor characteristics (negative bias) has not been shown any non-human animal. Here we test whether a choice between two new, neutral behavioural...
The pied flycatcher is one of the most phenotypically variable bird species in Europe. geographic variation phenotypes has often been attributed to spatial selection regimes that associated with presence or absence congeneric collared flycatcher. Spatial could however also be generated by spatially restricted gene flow and genetic drift. We examined population structure flycatchers across breeding range applied phenotypic Q(ST) (P(ST))-F(ST) approach detect indirect signals divergent on...
Because of its importance in directing evolutionary trajectories, there has been considerable interest comparing variation among genetic variance-covariance (G) matrices. Numerous statistical approaches have suggested but no general analysis the relationship these methods previously published. In this study, we used data from a half-sib experiment and simulations to explore results applying eight tests (T method, modified Mantel test, Bartlett's Flury hierarchy, jackknife-manova,...
Communities of symbiotic microorganisms that colonize the gastrointestinal tract play an important role in food digestion and protection against opportunistic microbes. Diet diversity increases number symbionts intestines, a benefit is considered to impose no cost for host organism. However, less known about possible immunological investments hosts have make order control infections caused by symbiont populations increase because diet diversity. Using taxonomical composition analysis 16S...
Many organisms adjust their reproductive phenology in response to climate change, but phenological sensitivity temperature may vary between species. For example, resident and migratory birds have vastly different annual cycles, which can cause differential at the breeding grounds, affect competitive dynamics. Currently, however, adjustment change been studied separately or relatively small geographical scales with varying time series durations methodologies. Here, we effects of on using mean...
Eating disorders are evolutionarily novel conditions that lead to some of the highest mortality rates all psychiatric disorders. Several evolutionary hypotheses have been proposed for eating disorders, but only intrasexual competition hypothesis is extensively supported by evidence. We present mismatch as a necessary extension current theoretical framework This explains adaptive metaproblem has arisen when mating motives and readily available food rewards conflict with one another. situation...
Immune function, height and resource accumulation comprise important life history traits in humans. Resource availability models arising from theory suggest that socioeconomic conditions influence immune growth health status. In this study, we tested whether there are associations between family income during ontogeny, adult height, cortisol level response women. A hepatitis B vaccine was administered to 66 young Latvian women different backgrounds, blood samples were then collected measure...
Significance In many monogamous species, a substantial proportion of offspring is sired by other males than the one providing care at nest. Although females often solicit extra-pair mating, benefits copulations to are not fully understood. this study on pied flycatchers, we tested whether paternity in neighboring nests may have affected likelihood that helped defend against predators. We found sires were more engaged and invested heavily cooperative predator defense without offspring. For...
Theory predicts that animals in adverse conditions can decrease individual risks and increase long-term benefits by cooperating with neighbours. However, some empirical studies suggest often focus on short-term benefits, which reduce the likelihood they will cooperate others. In this experimental study, we tested between these two alternatives evaluating whether increased predation risk (as a correlate of environmental adversity) enhances or diminishes occurrence cooperation mobbing, common...
Summary 1. In a seasonal environment, subcutaneous energy reserves of resident animals often increase in winter and decline again summer reflecting gradual changes their fattening strategies. We studied body wintering great tits relation to dominance status under two contrasting temperature regimes see whether individuals are capable optimizing mass even extreme environmental conditions. 2. predicted that dominant will carry lesser amount than subordinate mild conditions the same exceed...