title: Variability of space-use patterns in a free living eusocial rodent, Ansell's mole-rat indicates age-based rather than caste polyethism.
abstract: 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.
authors.affiliation: 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.
authors.forename: Jan
authors.initials: J
authors.lastname: Šklíba
authors.affiliation: Department of Zoology, Faculty of Science, University of South Bohemia, Branišovská 1760, 370 05 České Budějovice, Czech Republic.
authors.forename: Matěj
authors.initials: M
authors.lastname: Lövy
authors.affiliation: Department of General Zoology, Faculty of Biology, University of Duisburg-Essen, 45117 Essen, Germany.
authors.forename: Hynek
authors.initials: H
authors.lastname: Burda
authors.affiliation: Department of Zoology, Faculty of Science, University of South Bohemia, Branišovská 1760, 370 05 České Budějovice, Czech Republic.
authors.forename: Radim
authors.initials: R
authors.lastname: Šumbera
mesh_terms: D000818:Animals; D005260:Female; D008297:Male; D000367:Age Factors; D003299:Cooperative Behavior; D019577:Mole Rats / Q000502:physiology; D012098:Reproduction / Q000502:physiology; D012737:Sex Factors; D013037:Spatial Behavior / Q000502:physiology; D015024:Zambia