Marcel Eens
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Avian hissing sounds: occurrence, mechanism, ontogeny, function and phylogeny Open
Sound production is widespread across the animal kingdom and can take many forms and serve various functions. A hissing sound is a non-vocal acoustic signal produced by forced air ventilation and is hypothesized to be a behavioural symples…
View article: The physics of sociality: Investigating patterns of social resource distribution among the Pan species
The physics of sociality: Investigating patterns of social resource distribution among the Pan species Open
Humans invest social resources in predictable "circles of friends," from intimate ties to acquaintances. Whether these concentric social bonding dynamics (CSBD) are uniquely human or shared with other primates is unclear. We applied the CS…
Female chronotype is not related to annual and lifetime reproductive success in a free-living songbird Open
Circadian clocks play a crucial role in regulating the sleep–wake rhythm of organisms, aligning their activity with fluctuating environmental factors, such as light intensity. Still, significant and consistent interindividual differences i…
Distribution of Legacy and Emerging PFASs in a Terrestrial Ecosystem Located near a Fluorochemical Manufacturing Facility Open
This study investigated the distribution of 29 legacy and emerging per- and polyfluoroalkyl substances (PFASs) in soil, nettles, invertebrates, and plasma and feathers of great tits (Parus major) of a terrestrial ecosystem near a fluoroche…
A comprehensive atlas of the bonobo gut bacteriome and its associated host and exposome factors Open
In great apes, the gut bacteriome shapes key physiological functions and is influenced by both the exposome and the host. Yet, isolating these independent contributions remains challenging. We sequenced 644 fecal samples from 212 wild and …
View article: Continental Patterns of Phenotypic Variation Along Replicated Urban Gradients: A Mega‐Analysis
Continental Patterns of Phenotypic Variation Along Replicated Urban Gradients: A Mega‐Analysis Open
Individual variation among and within natural populations can have eco‐evolutionary implications by, for example, affecting species interactions or evolutionary potential. Urban systems present a unique opportunity to evaluate how environm…
Achromatic Markings as Male Quality Indicators in a Crepuscular Bird Open
Secondary sexual traits, such as specific body parts or colouration, play an important role in mating interactions. It has been proposed that they function as quality indicators driven by sexual selection. In birds, much attention has been…
Artificial Light at Night Advances the Onset of Vocal Activity in Both Male and Female Great Tits During the Breeding Season, While Noise Pollution Has Less Impact and Only in Females Open
Artificial light at night (ALAN) and noise pollution are two important stressors associated with urbanisation that can have a profound impact on animal behaviour and physiology, potentially disrupting biological rhythms. Although the influ…
Per- and Polyfluoroalkyl Substances (PFAS) Accumulation, Reproductive Impairment, and Associations with Nestling Body Condition in Great (Parus major)- and Blue Tits (Cyanistes caeruleus) Living near a Hotspot in Belgium Open
Due to the limited number of field studies investigating associations between environmentally relevant per- and polyfluoroalkyl substances (PFAS) mixtures and reproductive impairment, there is uncertainty as to whether birds are affected b…
Per- and polyfluoroalkyl substances (PFAS) in homegrown crops: Accumulation and human risk assessment Open
Homegrown crops can present a significant exposure source of per- and polyfluoroalkyl substances (PFAS) to humans. Field studies studying PFAS accumulation in multiple vegetable food categories and examining the potential influence of soil…
Dynamic spatiotemporal changes of per- and polyfluoroalkyl substances (PFAS) in soil and eggs of private gardens at different distances from a fluorochemical plant Open
Homegrown food serves as an important human exposure source of per- and polyfluoroalkyl substances (PFAS), yet little is known about their spatiotemporal distribution within and among private gardens. This knowledge is essential for more a…
Evolution in European and Israeli school curricula – a comparative analysis Open
The contribution of school curricula to public understanding and acceptance of evolution is still mostly unknown, due to the scarcity of studies that compare the learning goals present in different curricula. To overcome this lack of data …
Group-level signatures in bonobo sociality Open
Humans show remarkable differences in social behaviour between families, groups, communities and cultures, whereas such group-level within-species variation in socio-behavioural propensities is typically overlooked in other species. Studie…
Qualitative Behavioural Assessment of bonobo emotional expressivity across observer groups and zoo housing environments Open
Human evaluation of animal emotional expressivity can inform animal welfare. Qualitative Behavioural Assessment (QBA) has been applied to domesticated and some non-domesticated animals, but its use in primates is limited despite their emot…
Group-specific expressions of co-feeding tolerance in bonobos and chimpanzees preclude dichotomous species generalizations Open
Bonobos are typically portrayed as more socially tolerant than chimpanzees, yet the current evidence supporting such a species-level categorization is equivocal. Here, we used validated group-level co-feeding assays to systematically test …
Assessment of poly- and perfluoroalkyl substances (PFAS) in commercially available drinking straws using targeted and suspect screening approaches Open
Many food contact materials (FCMs) and reusable plastics in the food industry contain poly- and perfluoroalkyl substances (PFAS), a group of synthetic pollutants that are known to be potentially harmful for wildlife, humans, and the enviro…
Editorial: Behavioral ecological insights into organismal responses to anthropogenic environmental change: a multi-stress perspective Open
EDITORIAL article Front. Ecol. Evol., 02 May 2023Sec. Behavioral and Evolutionary Ecology Volume 11 - 2023 | https://doi.org/10.3389/fevo.2023.1200682
Multi-group analysis of grooming network position in a highly social primate Open
Individual variation in complex social behavioral traits, like primate grooming, can be influenced by the characteristics of the individual and those of its social group. To better grasp this complexity, social network analysis can be used…
A retrospective investigation of feather corticosterone in a highly contaminated white-tailed eagle (Haliaeetus albicilla) population Open
Exposure to persistent organic pollutants (POPs), such as organochlorines (OCs) and polybrominated diphenyl ethers (PBDEs), is associated with adverse health effects in wildlife. Many POPs have been banned and consequently their environmen…
Females Are More Aggressive Than Males towards Same- and Opposite-Sex Intruders in the Blue Tit (Cyanistes caeruleus) Open
During the breeding season, aggression is expressed to gain access to resources such as territories and mates and protect offspring. Female aggressiveness has received much less attention than male aggressiveness, and few studies have exam…