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Sperm storage induces an immunity cost in ants

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Authors:
  • Baer, Boris ;
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    unknown
  • Armitage, Sophie A O ;
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    Section of Population Biology, Department of Biology, Faculty of Science, Københavns Universitet
  • Boomsma, Jacobus J
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    Orcid logo0000-0002-3598-1609
    Ecology and Evolution, Department of Biology, Faculty of Science, Københavns Universitet
DOI:
10.1038/nature04698
Abstract:
Ant queens are among the most long-lived insects known. They mate early in adult life and maintain millions of viable sperm in their sperm storage organ until they die many years later. Because they never re-mate, the reproductive success of queens is ultimately sperm-limited, but it is not known what selective forces determine the upper limit to sperm storage. Here we show that sperm storage carries a significant cost of reduced immunity during colony founding. Newly mated queens of the leaf-cutting ant Atta colombica upregulate their immune response shortly after completing their nest burrow, probably as an adaptive response to a greater exposure to pathogens in the absence of grooming workers. However, the immune response nine days after colony founding is negatively correlated with the amount of sperm in the sperm storage organ, indicating that short-term survival is traded off against long-term reproductive success. The immune response was lower when more males contributed to the stored sperm, indicating that there might be an additional cost of mating or storing genetically different ejaculates.
Type:
Journal article
Language:
English
Published in:
Nature, 2006, Vol 441, Issue 7095, p. 872-5
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2006
Scientific Level:
Scientific
ID:
8463205

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