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Does the queen win it all? Queen–worker conflict over male production in the bumblebee, Bombus terrestris
The outcome of this conflict in the bumblebee, Bombus terrestris, whose annual colony life cycle is characterized by overt competition over male production is investigated, and a possible scenario of an evolutionary arms race that may occur between these two female castes is suggested.
Queen influence on worker reproduction in bumblebees (Bombus terrestris) colonies
Results indicate that workers autoregulate their reproduction rather than it being controlled by the queen (pheromonal or behavioural), which may be the result of the workers’ perception of the queen and, possibly, her status through pheromonal emission.
Absence of individual sterility in thelytokous colonies of the ant Cerapachys biroi Forel (Formicidae, Cerapachyinae)
This reproductive strategy, scarce among Formicidae, was studied in C. biroi, an obligatory thelytokous cerapachyine ant and it was revealed that no sterile caste was present in the colonies and reproduction was linked both to a temporal polyethism and to a morphologicalpolyethism.
Preimaginal learning as a basis of colony-brood recognition in the ant Cataglyphis cursor.
Results presented here indicate that the mechanism of colony-brood recognition is acquired in large part during larval life and persists through the metamorphosis into the adult stage.
The reproductive cycle of thelytokous colonies of Cerapachys biroi Forel (Formicidae, Cerapachyinae)
This repeated phasic reproductive cycle where adult activity and development of the brood are synchronised reminds that of true army ants (subfamily Ecitoninae), which brings new arguments in favour of a filiation between both groups.
Reproductive plasticity in bumblebee workers (Bombus terrestris)—reversion from fertility to sterility under queen influence
Egg-laying workers that were introduced into queenless colonies mostly maintained their fertility regardless of colony social phase, which shows that worker transition from cooperative to selfish behavior is reversible depending on the social context.
Relation Between Behaviour and Physiological Maturation in a Ponerine Ant
This study evidenced that the behavioural differences recorded among workers of a same age class are related to at least one physiological parameter, which means that variations in the course of the functional stages as compared to a basic age polyethism, may be partly explained by physiological maturation.