Abstract：
:In the polymorphic harvester ant Messor barbarus, the colony modulates response during foraging according to seed characteristics. The easiness of picking up small seeds (oat fragments or canary seeds) shortens the time lapse between food discovery and the return of scouts to the nest, favouring the onset of recruitment and higher mobilisation rates than bigger seeds (whole oat). However, size is not the only criterion, as canary seeds are preferred among small ones. A modulation of the trail laid by the first scouts also plays a role in the shaping of harvesting patterns and in the enhancement of recruitment towards small and/or preferred seed. This flexibility extends to the relative participation of the three worker sizes classes, which differs according to seed. Media are the most numerous at the foraging arena and largely responsible for trail-laying. Minor participate in seed harvesting and trail-laying, mostly when they can be efficient in carrying seeds, such as oat fragments. Major scarcely participate in harvesting and trail-laying, but are involved in the exploitation of bigger and/or preferred seed species. When faced with different seed species, M. barbarus seems thus to collectively adopt a "foraging time minimisation" rather than an "energetic gain per item harvested maximisation" strategy. Dynamics of foraging and division of labour between foragers of different sizes are related to both the workers' ability to carry seed items, and the transfer of information to nestmates by trail-laying, all parameters that vary according to seed characteristics.
journal_name
Behav Processesjournal_title
Behavioural processesauthors
Heredia A,Detrain Cdoi
10.1016/j.beproc.2005.08.001keywords:
subject
Has Abstractpub_date
2005-11-01 00:00:00pages
289-300issue
3eissn
0376-6357issn
1872-8308pii
S0376-6357(05)00169-5journal_volume
70pub_type
杂志文章abstract：:Many studies have suggested that non-human primates have good individual recognition abilities, that social stimuli can serve as discriminative stimuli in learning tests and that visual access to social objects or events can be a reinforcer for operant behaviour. Intensified research efforts comparing the effectivenes...
journal_title：Behavioural processes
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journal_title：Behavioural processes
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journal_title：Behavioural processes
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