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1

Intraspecific behavioural interactions in Apodemus microps: a peaceful mouse?

100%
Suchomelova E., Frynta D.
Acta Theriologica
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2000
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tom 45
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nr 2
Social interactions of captive Apodemus microps Kratochvil et Rosicky, 1952 were studied in dyadic encounters. In neutral-cage conditions both sexes showed exceptionally high proportion of amicable behaviour (on average ca 30% of the total time) and very low proportion of agonistic behaviour (up to 2.1%), when compared to patterns reported in other Apodemus species. The high share of amicable behaviour cannot be simply explained by decreased aggression. Mice actively offered amicable acts to their unfamiliar conspecifics even during the short-time (ten-minute) encounters. This phenomenon may be interpreted as a cooperative strategy. However, the near absence of aggression in A. microps could be altered by specific social contexts: males, but not females, became mutually agonistic when tested in a home-cage or in the presence of a female.
2

Skull shape in the genus Apodemus: phylogenetic conservatism and-or adaptation to local conditions

81%
Frynta D., Mikulova P., Vohralik V.
Acta Theriologica
|
2006
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tom 51
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nr 2
139-153
We studied morphological variation among western Palaearctic species of woodmice (genusApodemus). Twenty one dental and skull variables were measured and evaluated using multivariate statistical approaches. A total of 501 specimens of the following 9 species of wood mice were examined:A. hermonensis, A. hyrcanicus, A. uralensis (=microps),A. flavicollis, A. sylvaticus, A. epimelas, A. mystacinus, A. peninsulae, A. agrarius. Species occupying large geographic areas were represented by two or three geographically distant populations. The analyses, based both on original and size adjusted data, revealed congruence between morphological evolution and phylogenetic relationships. The integrity of major clades was supported by morphometric trees. Conspecific samples showed a clear tendency to cluster together regardless of ecological differences and geographical distances. This finding may suggest that studied traits exhibit evolutionary conservatism, and therefore are not fully determined by actual selective pressures. Besides this, we demonstrated that morphological differentiation of taxa belonging to the subgenus Sylvaemus was more pronounced in Central Europe than in the Near East. This observed phenomenon could be of adaptive nature.
3

Delayed plumage maturation correlates with testosterone levels in Black Redstart Phoenicurus ochruros males

81%
Schwarzova L., Fuchs R., Frynta D.
Acta Ornithologica
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2010
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tom 45
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nr 1
4

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

51%
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
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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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