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      Behavioural and chemical studies of discrimination processes in the leaf-cutting ant Acromyrmex laticeps nigrosetosus (Forel, 1908) Translated title: Estudos químico e comportamental dos processos discriminatórios na formiga cortadeira Acromyrmex laticeps nigrosetosus (Forel, 1908)

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          Abstract

          Leaf-cutting ants live in symbiosis with a basidiomycete fungus that is exploited as a source of nutrients for ant larvae. Tests of brood transport revealed that Acromyrmex laticeps nigrosetosus workers did not discriminate a concolonial brood from an alien brood. The same result was observed with tests of fungus transport. Adult workers showed no aggressive behaviour to workers from other alien colonies (non-nestmates). There was no qualitative variation in the chemical profiles of larvae, pupae and adult workers from the different colonies. However, quantitative differences were observed between the different colonies. Hypotheses about the lack of intraspecific aggression in this subspecies of ants are discussed.

          Translated abstract

          As formigas cortadeiras vivem em simbiose com um fungo basidiomiceto que é utilizado como fonte de nutriente para suas larvas. Testes de transporte de prole revelaram que as operárias de Acromyrmex laticeps nigrosetosus não discriminaram a prole concolonial de prole estranha. O mesmo resultado foi verificado com testes de transporte do fungo. As operárias adultas não exibiram comportamento agressivo frente a operárias de outras colônias (não companheiras de ninho). Não houve variação qualitativa nos perfis químicos de larvas, pupas e operárias adultas de diferentes colônias. No entanto, diferenças quantitativas foram observadas entre as diferentes colônias. Hipóteses sobre a ausência de agressão intra-específica nesta subespécie de formiga são discutidas.

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          Most cited references21

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          Direct Behavioral Evidence for Hydrocarbons as Ant Recognition Discriminators

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            Camponotus fellah colony integration: worker individuality necessitates frequent hydrocarbon exchanges.

            Our aim was to test the existence of Gestalt colony odour in Camponotus fellah. We isolated individual workers to prevent trophallaxis, allogrooming and body contact. After 20 days, the cuticular hydrocarbon profile of the isolated ants diverged from that of the parent colony. Moreover, each isolated individual had its own specific blend. This procedure showed that after about 20 days of isolation there was a turnover of the colony odour, revealing the genetically expressed hydrocarbon profile of each individual. It also showed that the cuticular hydrocarbon profile is polymorphic, and that its homogeneity within a colony is maintained by frequent exchanges of hydrocarbons between workers. Behavioural observations of resident workers, in their nest, towards nestmates reintroduced after isolation indicated that a short isolation period (3-5 days), which induced a minor change in hydrocarbon profile, provoked frequent trophallactic solicitations. These were likely to permit the isolated ants to readjust their hydrocarbon profile to that of the ants in the mother colony. Longer isolation periods (20-40 days) induced a greater change in hydrocarbon profile and made the residents intolerant towards their introduced nestmates. Therefore, our results clearly support the existence of a Gestalt colony odour in C. fellah. They also show that since individual hydrocarbon production is dynamic, workers are obliged to exchange hydrocarbons continually (mainly by trophallaxis) in order to be in the Gestalt, and properly integrate into the colony. Copyright 2000 The Association for the Study of Animal Behaviour.
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              Label familiarity and discriminatory ability of ants reared in mixed groups

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                Author and article information

                Journal
                bjb
                Brazilian Journal of Biology
                Braz. J. Biol.
                Instituto Internacional de Ecologia (São Carlos, SP, Brazil )
                1519-6984
                1678-4375
                August 2006
                : 66
                : 3
                : 863-871
                Affiliations
                [01] Viçosa MG orgnameUniversidade Federal de Viçosa orgdiv1Departamento de Biologia Animal Brazil
                [02] orgnameUniversité de Tours orgdiv1Institut de Recherche sur la Biologie de l'Insecte France
                Article
                S1519-69842006000500012 S1519-6984(06)06600312
                74a13191-9e8a-447c-b572-185e8c3c1d29

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 24 May 2004
                : 11 August 2004
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 21, Pages: 9
                Product

                SciELO Brazil

                Self URI: Full text available only in PDF format (EN)
                Categories
                Biology

                General life sciences
                formigas cortadeiras,agressividade intraespecífica,perfis químicos,discriminação de prole,discriminação de fungo,leaf-cutting ants,intraspecific aggressiveness,chemical profiles,brood discrimination,fungus discrimination

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