Cuticular hydrocarbon profiles and aggregation in four Periplaneta species (Insecta: Dictyoptera)

Saïd, Imen; Costagliola, Guy; Leoncini, Isabelle; Rivault, Colette

doi:10.1016/j.jinsphys.2005.04.017

Cited by 54 publications

(44 citation statements)

References 19 publications

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“…However, this selforganization does not exclude that the influence or attractiveness between individuals can differ by population. For example, as cuticular hydrocarbons act as aggregation pheromones [52], 'leader' individuals producing more cuticular hydrocarbons will act as key individuals [53] and contribute unintentionally more than others to the nucleation of aggregates and consequently to the collective decision. Indeed, it will influence 'followers' with lower attractiveness to stay longer under the 'leader' shelter.…”

Section: Discussion (A) Individual Personalitymentioning

confidence: 99%

Group personality during collective decision-making: a multi-level approach

et al. 2015

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Collective decision-making processes emerge from social feedback networks within a group. Many studies on collective behaviour underestimate the role of individual personality and, as a result, personality is rarely analysed in the context of collective dynamics. Here, we show evidence of sheltering behaviour personality in a gregarious insect (Periplaneta americana), which is characterized by a collective personality at the group level. We also highlight that the individuals within groups exhibited consistent personality traits in their probability of sheltering and total time sheltered during the three trials over one week. Moreover, the group personality, which arises from the synergy between the distribution of behaviour profiles in the group and social amplifications, affected the sheltering dynamics. However, owing to its robustness, personality did not affect the group probability of reaching a consensus. Finally, to prove social interactions, we developed a new statistical method that will be helpful for future research on personality traits and group behaviour. This approach will help to identify the circumstances under which particular group compositions may improve the fitness of individuals in gregarious species.

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Section: Discussion (A) Individual Personalitymentioning

confidence: 99%

Group personality during collective decision-making: a multi-level approach

et al. 2015

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“…As proof of concept, the separation protocol was first tested with extracts of male and female American cockroaches, Periplaneta americana. The sexes have similar cuticular lipid profiles containing ∼25 compounds (35). Because the sexes could conceivably produce different stereoisomers of individual MBCHs, the CHCs of each sex were analyzed separately.…”

Section: Resultsmentioning

confidence: 99%

Isolation and determination of absolute configurations of insect-produced methyl-branched hydrocarbons

Bello¹,

McElfresh

Millar

2015

Proc. Natl. Acad. Sci. U.S.A.

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Although the effects of stereochemistry have been studied extensively for volatile insect pheromones, little is known about the effects of chirality in the nonvolatile methyl-branched hydrocarbons (MBCHs) used by many insects as contact pheromones. MBCHs generally contain one or more chiral centers and so two or more stereoisomeric forms are possible for each structure. However, it is not known whether insects biosynthesize these molecules in high stereoisomeric purity, nor is it known whether insects can distinguish the different stereoisomeric forms of MBCHs. This knowledge gap is due in part to the lack of methods for isolating individual MBCHs from the complex cuticular hydrocarbon (CHC) blends of insects, as well as the difficulty in determining the absolute configurations of the isolated MBCHs. To address these deficiencies, we report a straightforward method for the isolation of individual cuticular hydrocarbons from the complex CHC blend. The method was used to isolate 36 pure MBCHs from 20 species in nine insect orders. The absolute stereochemistries of the purified MBCHs then were determined by digital polarimetry. The absolute configurations of all of the isolated MBCHs were determined to be (R) by comparison with a library of synthesized, enantiomerically pure standards, suggesting that the biosynthetic pathways used to construct MBCHs are highly conserved within the Insecta. The development of a straightforward method for isolation of specific CHCs will enable determination of their functional roles by providing pure compounds for bioassays.T he use of chemical signals is highly developed within insects, with semiochemicals mediating a wide variety of inter-and intraspecific behaviors. Volatile pheromones, such as sex and aggregation pheromones, are the most well-known types, but insects also use nonvolatile cuticular lipids as contact pheromones (1-4). The cuticular lipids consist of a complex blend of n-and methyl-branched alkanes, alkenes, and lesser amounts of more polar compounds such as esters and alcohols. The lipid layer acts primarily as a waterproofing barrier (5), but individual lipid components have evolved secondary roles as signals that mediate a variety of behaviors and physiological changes (1, 2, 6). For example, solitary insects use cuticular hydrocarbons (CHCs) to identify the species and sex of mates (7, 8) whereas, in social insects, CHCs mediate identification of nestmates (9, 10), recognition of castes, and task allocation within the colony (11). Social insect queens also use CHCs to signal fecundity and dominance status within the colony, inhibiting development of workers into reproductives (12)(13)(14).Determining the roles of specific CHCs as signals has been hindered by three interlinked problems. First, CHCs typically consist of a large number of compounds, which can be difficult to isolate in pure form to test their bioactivities. Specifically, CHCs have very similar polarity and so are not separable by liquid chromatography on silica gel or other polar chromatographic m...

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“…In this study, the groups had already made a collective decision before the first day of experiment. Hence, the model did not consider direct inter-attraction between individuals and only considered the exploratory behavior during the active phase and the settlement process during the resting phase, which is affected by hydrocarbon deposition (indirect inter-attraction)49. Indeed, the probability Ψ(NS, S) was greater than the Ψ(S, NS) for the UD condition, thus favoring the occupation of the S shelter.…”

Section: Discussionmentioning

confidence: 99%

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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Cuticular hydrocarbon profiles and aggregation in four Periplaneta species (Insecta: Dictyoptera)

Cited by 54 publications

References 19 publications

Group personality during collective decision-making: a multi-level approach

Group personality during collective decision-making: a multi-level approach

Isolation and determination of absolute configurations of insect-produced methyl-branched hydrocarbons

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

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