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2016 ; 113
(37
): 10382-7
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Differences in cooperative behavior among Damaraland mole rats are consequences
of an age-related polyethism
#MMPMID27588902
Zöttl M
; Vullioud P
; Mendonça R
; Torrents Ticó M
; Gaynor D
; Mitchell A
; Clutton-Brock T
Proc Natl Acad Sci U S A
2016[Sep]; 113
(37
): 10382-7
PMID27588902
show ga
In many cooperative breeders, the contributions of helpers to cooperative
activities change with age, resulting in age-related polyethisms. In contrast,
some studies of social mole rats (including naked mole rats, Heterocephalus
glaber, and Damaraland mole rats, Fukomys damarensis) suggest that individual
differences in cooperative behavior are the result of divergent developmental
pathways, leading to discrete and permanent functional categories of helpers that
resemble the caste systems found in eusocial insects. Here we show that, in
Damaraland mole rats, individual contributions to cooperative behavior increase
with age and are higher in fast-growing individuals. Individual contributions to
different cooperative tasks are intercorrelated and repeatability of cooperative
behavior is similar to that found in other cooperatively breeding vertebrates.
Our data provide no evidence that nonreproductive individuals show divergent
developmental pathways or specialize in particular tasks. Instead of representing
a caste system, variation in the behavior of nonreproductive individuals in
Damaraland mole rats closely resembles that found in other cooperatively breeding
mammals and appears to be a consequence of age-related polyethism.