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• W1990278432 endingPage "20142502" @default.
• W1990278432 startingPage "20142502" @default.
• W1990278432 abstract "Group size in both multicellular organisms and animal societies can correlate with the degree of division of labour. For ants, the task specialization hypothesis (TSH) proposes that increased behavioural specialization enabled by larger group size corresponds to anatomical specialization of worker brains. Alternatively, the social brain hypothesis proposes that increased levels of social stimuli in larger colonies lead to enlarged brain regions in all workers, regardless of their task specialization. We tested these hypotheses in acacia ants ( Pseudomyrmex spinicola ), which exhibit behavioural but not morphological task specialization. In wild colonies, we marked, followed and tested ant workers involved in foraging tasks on the leaves (leaf-ants) and in defensive tasks on the host tree trunk (trunk-ants). Task specialization increased with colony size, especially in defensive tasks. The relationship between colony size and brain region volume was task-dependent, supporting the TSH. Specifically, as colony size increased, the relative size of regions within the mushroom bodies of the brain decreased in trunk-ants but increased in leaf-ants; those regions play important roles in learning and memory. Our findings suggest that workers specialized in defence may have reduced learning abilities relative to leaf-ants; these inferences remain to be tested. In societies with monomorphic workers, brain polymorphism enhanced by group size could be a mechanism by which division of labour is achieved." @default.
• W1990278432 created "2016-06-24" @default.
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• W1990278432 date "2015-02-22" @default.
• W1990278432 modified "2023-10-17" @default.
• W1990278432 title "Specialization and group size: brain and behavioural correlates of colony size in ants lacking morphological castes" @default.
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• W1990278432 doi "https://doi.org/10.1098/rspb.2014.2502" @default.
• W1990278432 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4309001" @default.
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