Long-lasting, selective, anxiogenic effects of feline predator stress in mice

Lasting increases in anxiety-like behavior (ALB) are produced by brief exposure of rats to a cat [Adamec RE, Shallow T, Lasting effects on rodent anxiety of a single exposure to a cat, Physiol. Behav., 54 (1993) 101–109.]. Mice also respond defensively to natural predator stimuli. Moreover, chronic exposure of mice to rat odor has immediate […]

Facility design for Bachelor Gorilla groups

This paper emerged from discussions following the Bachelor Gorilla 2000 Workshop Facility Design sessions. Although many ape facility design features are common to all gorillas, the purpose of this paper is to provide an overview of special needs of bachelor gorillas. For example, managing escalating aggression between maturing or silverback males may require a high […]

A possible role of habituation in the sexual behaviour of male mosquitofish (Gambusia affinis Baird & Girard)

Association patterns of African elephants in all-male groups: the role of age and genetic relatedness

Strong social bonds are uncommon among male mammals. In many mammals, however, males form all-male groups, providing opportunities for male-male bonds to emerge. We examined association patterns of male African elephants, Loxodonta africana, in all-male groups and assessed the influence of age and genetic relatedness on these associations. We also examined the influence of age […]

Defeat is a major stressor in males while social instability is stressful mainly in females: Towards the development of a social stress model in female rats

Social stress models appear useful in elucidating the interrelationship between stress, mood disorders, and drug efficacy. However, reliable social stress models for females are virtually lacking. The aim of this study was to determine stress-related consequences of (a) defeat in aggressive encounters and (b) social instability, in male and female rats. Defeat in male and […]

Sex differences in the effects of two stress paradigms on dopaminergic neurotransmission

Sex differences in behavioral and neurobiological responses to stress are considered to modulate the prevalence of some psychiatric disorders, including major depression. In the present study, we compared dopaminergic neurotransmission and behavior in response to two different stress paradigms, the Forced Swim Test (FST) and the Chronic Mild Stress (CMS). Male and female rats were […]

Effects of spatial food distribution on search behavior in rats (Rattus norvegicus)

To analyze how search strategies are adapted according to the geometric distribution of food sources, the authors submitted rats to a search task in which they had to explore 9 food trays in an open field and avoid visiting already-depleted trays. Trays were spatially arranged in 4 independent configurations: a cross, a 3 × 3 […]

Animal behaviour: cognitive bias and affective state.

Information processing by humans can be biased by their emotions — for example, anxious and depressed people tend to make negative judgements about events and to interpret ambiguous stimuli unfavourably1, 2, 3, 4. Here we show that such a ‘pessimistic’ response bias can also be measured in rats that are housed in unpredictable conditions5, 6. […]

First Suckling: A Crucial Event for Mother–Young Attachment? An Experimental Study in Horses (Equus caballus)

This study investigates the consequences of interference during first suckling for subsequent mare-young attachment in horses (Equus caballus). Foals brought to their dams’ teats appeared, at later ages (1-3 months), to remain closer to their dams and to play less than control foals that had been allowed to suckle spontaneously. Higher levels of play and […]

Postural effect on manual laterality in different tasks in captive grey-cheeked mangabey (Lophocebus albigena)

The authors examined the effects of task complexity and posture on laterality and compared lateralization during different tasks in 9 captive grey-cheeked mangabeys (Lophocebus albigena) during spontaneous food processing and 3 experimental tasks. Comparisons with data of red-capped mangabeys (Cercocebus torquatus torquatus; semiterrestrial species) were used. Less than half the monkeys were lateralized for simple […]