Abstract
Experiments show that high midsummer temperatures are not the cause of the two seasonal peaks of egg accumulation in Myrmica. Temperature alterations in queen-worker colony fragments cause immediate increases or decreases in the number of eggs accumulating, but numerical adjustment occurs after 14 days; egg numbers accumulating then becoming comparable to those before the temperature change. There is a compensatory adjustment of egg size in M. laevinodis. Egg production by solitary queens declines rapidly and is followed by the death of the queen. These results are discussed in relation to caste determination and colony foundation in ants.
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