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1

Taxonomic status and remarks on ecology of the Malawian mole-rat Cryptomys whytei [Rodentia, Bathyergidae]

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Burda H., Sumbera R., Chitaukali W. N., Dryden G. L.
Acta Theriologica
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2005
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tom 50
|
nr 4
529-536
Mole-rats from Karonga, Malawi, the type locality ofCryptomys hottentotus whytei, and a single female mole-rat from the Malawian Nyika Plateau exhibit a karyotype 2n = 4 6 chromosomes, wit h 1 5 metacentr ic an d 8 acrocentr ic chromosome, s ie NF (female) = 76. This trait, together with several morphological features and a previously published genetic analysis (Ingramet al. 2004), identifies this species as a good species, unrelated toCryptomys hottentotus of South Africa, which belongs to the Zambezian clade of the genusCryptomys sensu lato (cf Ingramet al. 2004) and should be therefore called Whyte’s mole-rat,Cryptomys whytei. Available data on ecology and reproductive biology sugges t simila r characteristic s a s i n othe r mole-rat s o f th e genu.s Unexpecte d findin g of lar ge complicat ed undergroun d burro w system s contrasted, howev,e r wi th ve ry f ew abo ve grou nd moun.d s
2

What determines the way of deposition of excavated soil in a subterranean rodent?

100%
Skliba J., Sumbera R., Chitaukali W. N.
Acta Theriologica
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2010
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tom 55
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nr 3
271-277
Subterranean rodents continuously extend their burrow systems primarily in search of food, which has an important impact on the ecosystem in which they live. Excavated soil may be pushed either into aboveground mounds or into tunnels underground. Factors affecting the amount of burrowing and the preference of aboveground or underground soil deposition are, nevertheless, little known. We investigated the influence of food supply, soil hardness, and the animal’s body mass on the mode of soil deposition in ten burrow systems of free ranging silvery mole-rats Heliophobius argenteocinereus Peters, 1846. In each burrow system, we estimated the volume of backfilled tunnels and the volume of soil deposited aboveground. The highest amount of variation in these parameters was explained by the interaction of food supply and soil hardness. The ratio of the volume of backfilled tunnels to the volume of mounds was not significantly dependent on any of the explanatory variables. The proportion of backfilled tunnels decreased with the increasing volume of the complete burrow system. We propose that both low food supply and soft soil lead to an increased amount of burrowing, which results in a larger volume of soil deposited both above ground and under ground over a given period of time.
3

Burrow architecture, family composition and habitat characteristics of the largest social African mole-rat: the giant mole-rat constructs really giant burrow systems

76%
Sumbera R., Mazoch V., Patzenhauerova H., Lovy M., Skliba J., Bryja J., Burda H.
Acta Theriologica
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2012
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tom 57
|
nr 2
Among African mole-rats, the giant mole-rat Fukomys mechowii is the largest social species. Despite several attempts to study a free-living population, information on its biology from natural habitats is very scarce. We mapped two neighbouring burrow systems of the giant mole-rat in a miombo woodland in Zambia. We provide information on the size and kin structure of the respective mole-rat families, architecture of their burrow systems, and characteristics of the food supply and soil around the two mapped and additional ten burrow systems. Both uncovered burrow systems were very large (total lengths, 2,245 and 743 m), making them the largest burrow systems ever mapped. Food resources around the additional ten burrow systems had a clumped distribution (standardized Morisita index of dispersion = 0.526), but a relatively high biomass (298 ± 455 g m−2). This, together with favourable soil conditions even in the advanced dry season (cone resistance, 328 ± 50 N m−2; soil density, 1.36 ± 0.06 g cm−3) indicates relatively hospitable ecological conditions. Both food supply and soil conditions were comparable with the conditions found in a miombo habitat of the solitary silvery mole-rat in Malawi. This suggests that there are no ecological constraints which would preclude the solitary life of a subterranean herbivore from the examined habitat. Microsatellite analysis supported the assumption that giant mole-rats live in monogamous multigenerational families with only one breeding pair of non-related animals and their offspring. The mean family size is consistent with previous findings on this species and comparable to that found in other Fukomys species studied thus far.
4

Social and life history correlates of litter size in captive colonies of precocial spiny mice (Acomys)

64%
Frynta D., Frankova M., Cizkova B., Skarlandtova H., Galestokova K., Prusova K., Sumbera R., Smilauer P.
Acta Theriologica
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2011
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tom 56
|
nr 3
Litter size is an important component of life history contributing to reproductive success in many animals. Among muroid rodents, spiny mice of the genus Acomys are exceptional because they produce large precocial offspring after a long gestation. We analyzed data on 1,809 litters from laboratory colonies of spiny mice from the cahirinus-dimidiatus group: Acomys cahirinus, Acomys cilicicus, Acomys sp. (Iran), and Acomys dimidiatus. Generalized mixed-effect models revealed that litter size increased with maternal body weight and/or number of immature females present in the family group. Thus, both maternal body reserves and presence of immature descendants demonstrating previous reproductive success enhance further reproduction in this social rodent.
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