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2014 ; 281
(1793
): ä Nephropedia Template TP
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Paternal signature in kin recognition cues of a social insect: concealed in
juveniles, revealed in adults
#MMPMID25165768
Wong JW
; Meunier J
; Lucas C
; Kölliker M
Proc Biol Sci
2014[Oct]; 281
(1793
): ä PMID25165768
show ga
Kin recognition is a key mechanism to direct social behaviours towards related
individuals or avoid inbreeding depression. In insects, recognition is generally
mediated by cuticular hydrocarbon (CHC) compounds, which are partly inherited
from parents. However, in social insects, potential nepotistic conflicts between
group members from different patrilines are predicted to select against the
expression of patriline-specific signatures in CHC profiles. Whereas this key
prediction in the evolution of insect signalling received empirical support in
eusocial insects, it remains unclear whether it can be generalized beyond
eusociality to less-derived forms of social life. Here, we addressed this issue
by manipulating the number of fathers siring clutches tended by females of the
European earwig, Forficula auricularia, analysing the CHC profiles of the
resulting juvenile and adult offspring, and using discriminant analysis to
estimate the information content of CHC with respect to the maternal and paternal
origin of individuals. As predicted, if paternally inherited cues are concealed
during family life, increases in mating number had no effect on information
content of CHC profiles among earwig juveniles, but significantly decreased the
one among adult offspring. We suggest that age-dependent expression of
patriline-specific cues evolved to limit the risks of nepotism as family-living
juveniles and favour sibling-mating avoidance as group-living adults. These
results highlight the role of parental care and social life in the evolution of
chemical communication and recognition cues.
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