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Effects of inbreeding on immune response and body size in a social insect, Bombus terrestris by C. U. Gerloff; B. K. Ottmer; P. Schmid‐Hempel is a Environmental Science article available to read on EtoBox.

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## Summary Inbreeding can negatively affect various fitness components. Here we examine how immune response and body size of a social insect are affected by inbreeding, sex and ploidy. In the bumble‐bee, __Bombus terrestris__ (L.), the offspring of colonies resulting from brother–sister matings were compared with that of outbred colonies. Immune response was measured as the degree of encapsulation of a novel antigen, body size as the length of the radial cell in the forewings. Inbreeding affected neither immune response nor body size in either workers or haploid males under laboratory conditions. However, fitness characteristics varied significantly among maternal families and colonies. The lack of detectable inbreeding depression for two fitness components might help explain why __B. terrestris__ is a good colonizer in nature. In addition, sex and ploidy strongly affected the fitness components studied: diploid males had a significantly lower immune response than haploid males, who in turn had a significantly lower immune response than workers of the same colony. The body size of diploid males was intermediate between the body size of workers and haploid males.

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Author

C. U. Gerloff; B. K. Ottmer; P. Schmid‐Hempel

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; JSTOR (ISSN 0269-8463)

Published

2003

Language

EN

Field

Environmental Science (Physical Sciences)