A dispersive morph in the naked mole-rat

  title={A dispersive morph in the naked mole-rat},
  author={M. O'Riain and J. Jarvis and C. Faulkes},
CLOSE inbreeding is known for a variety of small mammal species1–4 for which a high probability of mortality during dispersal makes helping and delayed maturation a relatively secure fitness option5. Prolonged inbreeding, however, is usually associated with lowered fitness6,7, and it has been shown that most highly inbred small mammals8 and social insects9 have inbreeding-avoidance mechanisms that promote some degree of outbreeding. However, previous field and laboratory research on the naked… Expand
Dispersal and new colony formation in wild naked mole-rats: evidence against inbreeding as the system of mating
Evidence of dispersers and outbreeding in colonies of wild naked mole-rats that suggests that inbreeding is not the system of mating for this species and that outbreeding is probably frequent. Expand
Growth affects dispersal success in social mole-rats, but not the duration of philopatry
It is shown that in Damaraland mole-rats, males that subsequently disperse successfully grow faster than other non-reproductive males, and contrary to the suggestion that faster growth represents a developmental specialization for early dispersal, fast-growing and slow-growing males remained equally long in their natal groups. Expand
Kin discrimination and female mate choice in the naked mole-rat Heterocephalus glaber
  • F. Clarke, C. Faulkes
  • Biology, Medicine
  • Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 1999
The findings suggest that, despite an evolutionary history of close inbreeding, naked mole–rats may not be exempt from the effects of inbreeding depression and will attempt to outbreed should the opportunity arise. Expand
New colony formation in the “highly inbred” eusocial naked mole-rat: outbreeding is preferred
It is shown that in laboratory colonies in which each individual had an equal number of familiar siblings and unfamiliar distant kin (UDK) as potential mates, mating pairs were significantly more likely to consist of UDK. Expand
Damaraland and naked mole-rats: Convergence of social evolution
African mole-rats (Family: Bathyergidae) have become well established as a model taxon with which to investigate the evolutionary origins and maintenance of cooperative breeding and there have been convergent gains and losses of sociality within the family. Expand
Natal dispersal in two mice species with contrasting social systems
The results showed that the natal dispersal of these two species differ; both sexes of the mound-building mice dispersed later than the house mice, where a difference between sexes also occurs; house mice males dispersed earlier than females. Expand
Mechanism for establishing and maintaining the reproductive hierarchy in a eusocial mammal, the Damaraland mole-rat
Results indicate that the nature of the interaction within the first 20 min of meeting determines the long-term sexual relationship between pairs of Damaraland mole-rats, suggesting a mechanistic basis for establishment and maintenance of the reproductive hierarchy in this eusocial species. Expand
Social Behavior in Naked Mole-Rats: Individual Differences in Phenotype and Proximate Mechanisms of Mammalian Eusociality.
Naked mole-rats (Heterocephalus glaber) are small rodents native to east Africa, living in subterranean colonies of up to 300 individuals. Within each colony, reproduction is restricted to a singleExpand
Intracolony aggression in the eusocial naked mole-rat, Heterocephalus glaber
Abstract In colonies of the eusocial naked mole-rat, breeding is monopolized by one dominant female (the ‘queen’) and one to three males. Aggression in the form of shoving (prolonged pushes involvingExpand
Aggression and motivation to disperse in eusocial naked mole-rats, Heterocephalus glaber
The data suggest that aggressive naked mole-rat queens motivate dispersal in their daughters and that female dispersers show traits consistent with successful queens (e.g. aggression), demonstrating that motivation to leave the colony, and not anticipatory reproductive maturation, is the key to successful dispersal. Expand


The Biology of the Naked Mole-Rat
An international group of researchers covers such topics as the evolution of eusociality, phylogeny and systematics of the rodent family Bathyergidae, population and behavioral ecology and genetics of naked mole-rats in the field, vocal and nonvocal behaviors, social organization and divisions of labor within colonies, and climatic, social, and physiological factors affecting growth, reproduction, and reproductive suppression. Expand
Investigation of genetic diversity in wild colonies of naked mole-rats (Heterocephalus glaber) by DNA fingerprinting
The lack of polymorphism in the MHC I questions its possible role in individual odour recognition in this species of rodent, and suggests that these animals are highly inbred, and that there may be little or no genetic diversity within and between closely neighbouring colonies in the wild. Expand
DNA "fingerprinting" reveals high levels of inbreeding in colonies of the eusocial naked mole-rat.
It is found that DNA fingerprints of colony-mates were strikingly similar and that between colonies they were much more alike than fingerprints of non-kin in other free-living vertebrates. Expand
Termite Eusocial Evolution: A Re-Examination of Bartz's Hypothesis and Assumptions
It is concluded that inbreeding according to Bartz's model may be a contributing factor in the social evolution of some termites but is probably not the major initiating or sustaining factor in termite social evolution. Expand
Behavior and genetic variation in natural populations.
An analysis of allelic variation at genetic loci controlling several esterases and hemoglobin indicates that wild populations of the house mouse are characterized by fine-scale genetic subdivision, which, through the territorial behavior of family groups (tribes), is achieved even in the absence of physical or ecological barriers to migration. Expand
Avoiding inbreeding: at what cost?
  • B. Bengtsson
  • Biology, Medicine
  • Journal of theoretical biology
  • 1978
The condition for spreading of a new reproductive strategy in a population is given and the results are discussed using data from the Great Tit, Man and the Japanese Quail on the effect of inbreeding. Expand
Inbreeding avoidance behaviors.
A growing literature now demonstrates that the offspring of matings between close relatives in species of undomesticated birds and mammals are less fit than outbred offspring. Expand
Individuality, social behavior, and reproductive success in yellow-bellied marmots
Current theory suggests that population dynamics are the consequence of the repro? ductive strategies of individuals. Individual differences should be expressed in reproductive output, dispersal,Expand
Genetics of the Evolutionary Process
1. The Unity and Diversity of Life2. Genetic Continuity and Change3. Mutation and Genetic Variability4. Normalizing Natural Selection5. Balancing Selection and Chromosomal Polymorphism6. BalancingExpand
The Ecology of Animal Movement
The editors' aim has been to concentrate on current and fundamental problems in movement to stimulate interest by enabling the authors to put forward new ideas in a well- reasoned and coherent way. Expand