Eusocial species of African mole-rats live in groups cooperating on multiple tasks and employing division of labour. In captivity, individuals of the same group differ in cooperative contribution as well as in preference for a particular task. Both can be viewed as polyethism. However, little information is available from free-ranging mole-rats, which live in large burrow systems. We made an attempt to detect polyethism in the free-living Ansell's mole-rat (Fukomys anselli) as differences in individuals' space-use patterns. We radio-tracked 17 adults from five groups. Large individuals, including breeding males, spent more time inside the nest than smaller individuals. Breeding females were more often located <10 m from the nest in comparison to non-breeding females, who were relatively more often located 30-90 m and exclusively >90 m from the nest. One non-breeding female even conducted a brief intrusion into a neighbouring group's territory via an open tunnel connection. A significant part of the variability in mole-rat space-use patterns was explained by body mass which is probably related to age in this species. This result can therefore be attributed to age polyethism. There was no apparent discontinuity in the space-use patterns of non-breeders that would indicate existence of castes.

Department of General Zoology Faculty of Biology University of Duisburg Essen 45117 Essen Germany

Department of Zoology Faculty of Science University of South Bohemia Branišovská 1760 370 05 České Budějovice Czech Republic

Institute of Entomology Biology Centre CAS Branišovská 1160 370 05 České Budějovice Czech Republic

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Wilson O. E. The Insect Societies. (Belknap Press of Harvard University Press, 1971).

Oster G. F. & Wilson E. O. Caste and Ecology in the Social Insects. (Princeton University Press, 1978). PubMed

Seeley T. D. Adaptive significance of the age polyethism schedule in honeybee colonies. Behav. Ecol. Sociobiol. 11, 287–293 (1982).

O’Riain M. J., Jarvis J. U. M., Alexander R., Buffenstein R. & Peeters C. Morphological castes in a vertebrate. Proc. Natl. Acad. Sci. USA 97, 13194–13197 (2000). PubMed PMC

Henry E. C., Dengler-Crish C. M. & Catania K. C. Growing out of a caste - reproduction and the making of the queen mole-rat. J. Exp. Biol. 210, 261–268 (2007). PubMed

O’Riain M. J., Jarvis J. U. M. & Faulkes C. G. A dispersive morph in the naked mole-rat. Nature 380, 619–621 (1996). PubMed

Burda H. Syndrome of eusociality in African subterranean mole-rats (Bathyergidae, Rodentia), its diagnosis and aetiology In Evolutionary theory and processes: Modern perspectives. (ed. Wasser S. P.) 385–418 (Springer: Netherlands, 1999).

Jarvis J. U. M. Eusociality in a mammal: cooperative breeding in naked mole-rat colonies. Science. 212, 571–573 (1981). PubMed

Bennett N. C. & Jarvis J. U. M. The social structure and reproductive biology of colonies of the mole-rat, Cryptomys damarensis (Rodentia, Bathyergidae). J. Mammal. 69, 293–302 (1988).

Bennett N. C. Behaviour and social organization in a colony of the Damaraland mole-rat Cryptomys damarensis. J. Zool. 220, 225–247 (1990).

Gaylard A., Harrison Y. & Bennett N. C. Temporal changes in the social structure of a captive colony of the Damaraland mole-rat, Cryptomys damarensis: the relationship of sex and age to dominance and burrow-maintenance activity. J. Zool. 244, 313–321 (1998).

Wallace E. D. & Bennett N. C. The colony structure and social organization of the giant Zambian mole-rat. Cryptomys mechowi. J. Zool. 244, 51–61 (1998).

Burda H. Constraints of pregnancy and evolution of sociality in mole-rats. With special reference to reproductive and social patterns in Cryptomys hottentotus (Bathyergidae, Rodentia). J. Zool. Syst. Evol. Res. 28, 26–39 (1990).

Lacey A. E. & Sherman P. W. Social organization of naked mole-rat colonies: Evidence of division of labor In The Biology of the Naked Mole-Rat (eds. Sherman P. W., Jarvis J. U. M. & Alexander R. D.) 275–336 (Princeton University Press, 1991).

Fritzsche P. & Gattermann R. Sozialverhalten, Kommunikation und Arbeitsteilung beim Sambischen Graumull Cryptomys anselli In Gruppenmechanismen (ed. Gansloßer U.) 159–172 (Filander-Verlag, 2002).

Mooney S. J., Filice D. C., Douglas N. R. & Holmes M. M. Task specialization and task switching in eusocial mammals. Anim. Behav. 109, 227–233 (2015).

Jacobs D. S., Bennett N. C., Jarvis J. U. M. & Crowe T. M. The colony structure and dominance hierarchy of the Damaraland mole-rat, Cryptomys damarensis (Rodentia: Bathyergidae), from Namibia. J. Zool. 224, 553–576 (1991).

Lövy M., Šklíba J. & Šumbera R. Spatial and temporal activity patterns of the free-living giant mole-rat (Fukomys mechowii), the largest social bathyergid. PLoS One 8, e55357 (2013). PubMed PMC

Dammann P., Šumbera R., Maßmann C., Scherag A. & Burda H. Extended longevity of reproductives appears to be common in Fukomys mole-rats (Rodentia, Bathyergidae). PLoS One 6, e18757 (2011). PubMed PMC

Lovegrove B. G. Colony size and structure, activity patterns and foraging behaviour of a colony of the social mole rat Cryptomys damarensis (Bathyergidae). J. Zool. 216, 391–402 (1988).

Brett R. A. The ecology of naked mole-rat colonies: burrowing, food, and limiting factors In The Biology of the Naked Mole-Rat (eds. Sherman P. W., Jarvis J. U. M. & Alexander R. D.) 137–184 (Prinecton University Press, 1991).

Šklíba J. et al.. A maze-lover’s dream: burrow architecture, natural history and habitat characteristics of Ansell’s mole-rat (Fukomys anselli). Mamm. Biol. 77, 420–427 (2012).

Jarvis J. U. M., Bennett N. C. & Spinks A. C. Food availability and foraging by wild colonies of Damaraland mole-rats (Cryptomys damarensis): implications for sociality. Oecologia 113, 290–298 (1998). PubMed

Bennett N. C. & Faulkes C. G. African mole-rats: ecology and eusociality. (Cambridge University Press, 2000).

Šumbera R. et al.. Burrow architecture, family composition and habitat characteristics of the largest social African mole-rat: the giant mole-rat constructs really giant burrow systems. Acta Theriol. 57, 121–130 (2012).

Harestad A. S. & Bunnel F. L. Home range and body weight - a reevaluation. Ecology 60, 389–402 (1979).

Tucker M. A., Ord T. J. & Rogers T. L. Evolutionary predictors of mammalian home range size: body mass, diet and the environment. Glob. Ecol. Biogeogr. 23, 1105–1114 (2014).

Scantlebury M., Speakman J. R., Oosthuizen M. K., Roper T. J. & Bennett N. C. Energetics reveals physiologically distinct castes in a eusocial mammal. Nature 440, 795–797 (2006). PubMed

Burda H. Reproductive biology (behaviour, breeding, and postnatal development) in subterranean mole-rats, Cryptomys hottentotus (Bathyergidae). Zeitschrift für Säugetierkd. 54, 360–376 (1989).

Begall S. & Burda H. Reproductive characteristics and growth rate in the eusocial Zambian common mole-rat (Cryptomys sp., Bathyergidae). Zeitschrift für Säugetierkd. 63, 297–306 (1998).

Jarvis J. U. M., O’Riain M. J. & McDaid E. Growth and factors affecting body size in naked mole-rat In The biology of the naked mole-rat (eds. Sherman P. W., Jarvis J. U. M. & Alexander R. D.) 358–383 (Princeton University Press, 1991).

Bennett N. C. & Navarro R. Differential growth patterns between successive litters of the eusocial Damaraland mole-rat, Cryptomys damarensis, from Namibia. J. Zool. 241, 465–473 (1997).

Clutton-Brock T. H., Russell A. F. & Sharpe L. L. Meerkat helpers do not specialize in particular acivities. Anim. Behav. 66, 531–540 (2003).

Hazell R. W. A., Bennett N. C., Jarvis J. U. M. & Griffin M. Adult dispersal in the co-operatively breeding Damaraland mole-rat (Cryptomys damarensis): a case study from the Waterberg region of Namibia. J. Zool. 252, 19–25 (2000).

Šklíba J. et al.. Social and environmental influences on daily activity pattern in free-living subterranean rodents: the case of a eusocial bathyergid. J. Biol. Rhythms 29, 203–214 (2014). PubMed

Zöttl M. et al.. Differences in cooperative behavior among Damaraland mole rats are consequences of an age-related polyethism. Proc. Natl. Acad. Sci. USA 113, 10382–10387 (2016). PubMed PMC

O’Riain M. J. & Faulkes C. G. In Ecology of social evolution (eds. Korb J. & Heinze J.) 207–223 (Springer Verlag, 2008).

Sherman P. W. & Lacey E. A. The eusociality continuum. Behav. Ecol. 6, 102–108 (1995).

Patzenhauerová H., Šklíba J., Bryja J. & Šumbera R. Parentage analysis of Ansell’s mole-rat family groups indicates a high reproductive skew despite relatively relaxed ecological constraints on dispersal. Mol. Ecol. 22, 4988–5000 (2013). PubMed

Burda H., Honeycutt R. L., Begall S., Locker-Grütjen O. & Scharff A. Are naked and common mole-rats eusocial and if so, why? Behav. Ecol. Sociobiol. 47, 293–303 (2000).

Šklíba J., Šumbera R., Chitaukali W. N. & Burda H. Home-range dynamics in a solitary subterranean rodent. Ethology 115, 217–226 (2009).

Lepš J. & Šmilauer P. Multivariate analysis of ecological data using CANOCO. (Cambridge University Press, 2003).

ter Braak J. C. F. & Šmilauer P. CANOCO Reference manual and CanoDraw for Windows User’s guide: Software for canonical community ordination (version 4.5). (Microcomputer Power, 2002).

Dammann P. & Burda H. Sexual activity and reproduction delay ageing in a mammal. Curr. Biol. 16, R117–R118 (2006). PubMed

Schielke C. K. M., Begall S. & Burda H. Reproductive state does not influence activity budgets of eusocial Ansell’s mole-rats, Fukomys anselli (Rodentia, Bathyergidae): A study of locomotor activity by means of RFID. Mamm. Biol. 77, 1–5 (2012).

Lacey E. et al.. An ethogram for the naked mole-rat: nonvocal behaviors In The Biology of the Naked Mole-Rat (eds. Sherman P. W., Jarvis J. U. M. & Alexander R. D.) 209–242 (Princeton University Press, 1991).

Longevity of a solitary mole-rat species and its implications for the assumed link between sociality and longevity in African mole-rats (Bathyergidae)

Sociality does not drive the evolution of large brains in eusocial African mole-rats