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• W4200365060 abstract "ABSTRACT Damaraland mole-rats ( Fukomys damarensis) are usually viewed as a eusocial or obligate cooperative breeder in which successful reproduction is dependent on help from closely related group members. However, because longitudinal studies of mole-rats in their natural environment are uncommon, the extent to which successful reproduction by breeders relies on assistance from other group members is unclear, and for non-breeders, the immediate and delayed fitness consequences of staying and helping are poorly understood. Using data from a 7-year field study of marked individuals, we investigate whether increasing group size confers reproductive and survival benefits to breeders and non-breeders, and explore the different routes through which individuals acquire breeding positions. We show that solitary natal dispersal was the most common route to breeding for both sexes and that the inheritance of dominant breeding positions was uncommon in both sexes. After dispersing, females typically settled alone in new burrow systems where they enjoyed high survival rates and remained in good body condition - often for several years - before being joined by males. In contrast to most obligately cooperative species, pairs of potential breeders reproduced successfully without helpers and experimentally formed pairs had the same reproductive success as larger established groups. Though larger breeding groups recruited slightly more pups on average, our data suggest that neither survival nor reproduction depend on the presence of non-breeding helpers, indicating that Damaraland mole-rats are not obligate cooperative breeders. We suggest that extended philopatry and group living in Damaraland mole-rats have evolved because of the high costs and constraints of dispersal rather than because of strong indirect benefits accrued through cooperative behaviour and that similarities between their breeding systems and those of obligatorily eusocial insects have been over-emphasized. Significance Statement The social mole-rats are often considered eusocial mammals in which successful reproduction depends on assistance from non-breeding helpers. In this study we show that in wild Damaraland mole-rats, the presence of non-breeders is associated with both costs and benefits and that nascent breeding pairs show high reproductive success despite the lack of non-breeding helpers. These findings indicate that Damaraland mole-rats are not obligate cooperative breeders and suggest that similarities between their breeding systems and those of obligatorily eusocial insects have been over-emphasized." @default.
• W4200365060 created "2021-12-31" @default.
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• W4200365060 date "2021-12-10" @default.
• W4200365060 modified "2023-09-29" @default.
• W4200365060 title "Damaraland mole-rats are not obligate cooperative breeders" @default.
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• W4200365060 doi "https://doi.org/10.1101/2021.12.08.471794" @default.
• W4200365060 hasPublicationYear "2021" @default.
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