Collective resilience in a disturbed environment: stability of the activity rhythm and group personality in Periplaneta americana

Salazar, Michel-Olivier Laurent; Planas‐Sitjà, Isaac; Deneubourg, Jean‐Louis; Sempo, Grégory

doi:10.1007/s00265-015-2000-3

Cited by 9 publications

(21 citation statements)

References 109 publications

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“…In our present study, we were able to quantify different traits for individuals without the collective context having a potential impact. The quantification of personality on individual thigmotaxis level shed some light on the proximal mechanisms that affect the presence of both individual and collective personality shown in previous studies on collective dynamics under different conditions in P. americana ( Laurent Salazar et al 2015 , Planas-Sitjà et al 2015 ). As positive thigmotaxis has been shown to have evolved in many species and to be important for their behavior and survival ( Grossen and Kelley 1972 , Kallai et al 2007 , Sharma et al 2009 ), we believe that the existence of individual thigmotactic preferences could be extensible to many of these species.…”

Section: Discussionmentioning

confidence: 84%

“…The KRD is the theoretical distribution of the W coefficients for random rank orders of the same number of experimental groups and repetitions (e.g., 24 groups and 3 repetitions and N = 1,000). We performed a Z -test to test the significance of the difference between the observed W coefficients and the corresponding KRD ( Zar 2010 , Laurent Salazar et al 2015 , Planas-Sitjà et al 2015 ). In this case, we assigned the value of 0 s to the RT of immobile individuals.…”

Section: Methodsmentioning

confidence: 99%

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Individual Thigmotactic Preference Affects the Fleeing Behavior of the American Cockroach (Blattodea: Blattidae)

Salazar

Planas‐Sitjà

Sempo

et al. 2018

Journal of Insect Science

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Positive thigmotactic behavior is associated with the ability to hide from predators and is important to explain aggregation and collective patterns in various animals. For example, this behavior has been observed in woodlice, domiciliary cockroaches, ants, and fish. Lately, research on different species is focused on the importance of animal personality for ecological and evolutionary processes, individual fitness and group cohesion. In fact, it is generally expected to find some degree of interindividual consistent differences for a behavior, unless specific circumstances, like predator attacks, hide the presence of personalities. In this research, we analyzed the individual thigmotactic preference of domiciliary cockroaches (Periplaneta americana (Linnaeus, 1758) (Blattodea: Blattidae)) and how it affected the fleeing behavior of isolated individuals inside a shelter after receiving a light stimulus. We notably highlight how isolated individuals show different consistent preferences regarding their position in the shelter, which is due to the individual thigmotaxis level, before the fleeing behavior. During the fleeing itself, cockroaches nearer to the wall, and therefore with more positive thigmotaxis, showed slower reaction lantencies to the stimulus. We propose that thigmotaxis homogenizes the interindividual differences among individuals and is important to explain the individual and collective fleeing behavior.

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Section: Discussionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Individual Thigmotactic Preference Affects the Fleeing Behavior of the American Cockroach (Blattodea: Blattidae)

Salazar

Planas‐Sitjà

Sempo

et al. 2018

Journal of Insect Science

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“…Indeed, Laurent Salazar et al 33. showed that behavior during the active phase could be explained without the use of social interactions.…”

Section: Discussionmentioning

confidence: 99%

“…Social behavior and group size effects have already been described in cockroaches presenting collective decision making17394041, and individuals have shown consistent differences during the aggregation process42. However, Laurent Salazar et al 33. showed that social interactions played a negligible role for the exploring behavior of cockroaches during the active phase (nighttime).…”

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confidence: 97%

Emigration dynamics of cockroaches under different disturbance regimes do not depend on individual personalities

Planas‐Sitjà

Salazar

Sempo

et al. 2017

Sci Rep

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Group-level properties, such as collective movements or decisions, can be considered an outcome of the interplay between individual behavior and social interactions. However, the respective influences of individual preferences and social interactions are not evident. In this research, we study the implications of behavioral variability on the migration dynamics of a group of gregarious insects (Periplaneta americana) subjected to two different disturbance regimes (one without disturbances and another one with high frequency of disturbances). The results indicate that individuals presented consistent behavior during the nighttime (active phase of cockroaches) in both conditions. Moreover, we used a modeling approach to test the role of personality during the migration process. The model considers identical individuals (no personality) without memory and no direct inter-attraction between individuals. The agreement between theoretical and experimental results shows that behavioral variability play a secondary role during migration dynamics. Our results showing individual personality during the nighttime (spontaneous decision to forage) but not during the emigration process (induced by environmental disturbances) highlight the plasticity of personality traits.

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“…The first one assumes individual personality variation within the group and social interactions (e.g., attraction to conspecifics) that are the same for all individuals. Different average individual behaviour would therefore lead to differences at the group level [ 48 , 54 ]. In such case, we predict that the groups composed with either all shy or all bold individuals will show different group-level properties according to their individual average behaviour.…”

Section: Introductionmentioning

confidence: 99%

The interplay between personalities and social interactions affects the cohesion of the group and the speed of aggregation

et al. 2018

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Collective decision-making plays a central role in group-living animals and can be crucial to the survival of a group and the fitness of its members. As group-level properties emerge from individual decisions, personality variation can be a major determinant of collective behaviours. Here, we explore the relationship between personality and social interactions to explain the speed and cohesion of collective decision making during the aggregation process of the American cockroach (Periplaneta americana). We composed groups solely with shy individuals (spending a long time sheltered) or bold individuals (spending a short time sheltered) and tested them in a binary setup (arena with two shelters) for 3 consecutive days. We analysed the shelter use of individuals and groups to compare behavioural consistency among days and analyse the collective decision-making process. Contrary to the bold groups, shy groups had a faster aggregation process with more individuals sheltered mainly because shy individuals found the shelter more rapidly. Moreover, we show that personality is modulated by social interactions. We show high behavioural plasticity in bold groups, where some individuals act shy. This also suggests that learning and regulation mechanisms may take place. This study sheds some light on the implications of individual personality for collective decision making and the key role of shy individuals in gregarious species, such as P. americana.

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Collective resilience in a disturbed environment: stability of the activity rhythm and group personality in Periplaneta americana

Cited by 9 publications

References 109 publications

Individual Thigmotactic Preference Affects the Fleeing Behavior of the American Cockroach (Blattodea: Blattidae)

Individual Thigmotactic Preference Affects the Fleeing Behavior of the American Cockroach (Blattodea: Blattidae)

Emigration dynamics of cockroaches under different disturbance regimes do not depend on individual personalities

The interplay between personalities and social interactions affects the cohesion of the group and the speed of aggregation

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