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Testing variation of locomotor activity and work within families of a social African mole-rat (\kur{Fukomys darlingi}), using the Trovan technology electronic identification system
ENGLOVÁ, Terezie
Activity of social mole-rats´ and their contribution to work and cooperative tasks are explained by two different types of polyethism, caste and age polyethism. Behavioural castes, based on different contributions to cooperative tasks were defined in many mole- rats´ species. However, additional experiments which would simulate higher working activity through manipulation with substrate or removal of some family members are rare. Contrary, in field and different laboratory studies, differences between individuals in the amount of work performed and task allocation were rather continual, and based on age (body mass). This study reveals locomotor and working activity of five families of Fukomys darlingi (43 individuals) which were obtained by radio-identification monitoring system and personal observation. Each family was tested twice, for the first time established families were tested and then after removal of most active workers. The Activity is related to individuals´ body mass, sex and reproductive status.
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Dělba práce a polyethismus v koloniích sociálních rypošů
ENGLOVÁ, Terezie
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 were found to differ in cooperative contribution as well as in preference for a particular task which is usually interpretted either as temporal polyethism or existence of behavioural castes. Studies describing these phenomenons based on observations of captive colonies suffer from methodological problems and their results are often contradictory, whereas studies on free-ranging mole-rats are few and limited by small sample sizes. In my thesis I review available literature on polyethism, division of labour and related penomenons in African mole-rats. Its general aim is to provide theoretical background for future laboratory experiments.
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Behavioural evidence for magnetic orientation in rodents
OLIVERIUSOVÁ, Ludmila
Magnetoreception in rodents was studied in this Ph.D. thesis. Behavioural evidence for compass magnetic orientation was found in two subterranean African rodents: the social giant mole-rat (Fukomys mechowii) and solitary silvery mole-rat (Heliophobius argenteocinereus) and epigeic rodent bank vole (Clethrionomys glareolus). The study is also focused on the role of magnetic orientation in solving the orientation task in Morris water maze in bank vole.
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Bioenergetics of reproduction and postnatal development of two species of social mole-rat of genus \kur{Fukomys}
ZEMANOVÁ, Milada
The resting metabolic rate of mole-rats was measured with a close-flow respirometry system and body temperature was recorded with a rectal thermometer at an ambient temperature within and below adult thermoneutrality range. The development of ability to thermoregulate was monitored for pups of Fukomys sp. Huddling and presence of adults reduced the body heat loss of pups of all monitored age, but no effect was observed on the metabolic rate of the pups until they were two months old. Huddling had no effect on resting metabolic rate and body temperature in adult giant mole-rats Fukomys mechowii. The maternal cost of reproduction was evaluated in females from two species of the genus Fukomys. The energetic expenditure of females increased with pup´s age.
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The Thermoregulatory Abilities in a Mole-rat \kur{Fukomys darlingi} and its Development in Pups
ZEMANOVÁ, Milada
The oxygen consumption and body temperature were measured in adults and pups of a social Mashona mole-rat(Fukomys darlingi)to test poikilothermic traits in this species and effect of presence of adults on pup´s thermoregulation abilities. The adult´s resting metabolic rate was 0.76 {$\pm$} 0.20 mlO2g-1hod-1 in the thermoneutral zone 27-34°C. We did not confirm poikilotermic traits in this species, because body temperature was stable (33.0 {$\pm$} 0.5°C) at low ambient temperatures. The pups started to thermoregulate in age of one month and they are able to maintain stable body temperature very late in age of three months. My results indicate that presence of adults is necessary for thermoregulation of pups.
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The Thermoregulatory Abilities in a Mole-rat \kur{Fukomys darlingi} and its Development in Pups
ZEMANOVÁ, Milada
The oxygen consumption and body temperature were measured in adults and pups of a social Mashona mole-rat(Fukomys darlingi)to test poikilothermic traits in this species and effect of presence of adults on pup´s thermoregulation abilities. The adult´s resting metabolic rate was 0.76 {$\pm$} 0.20 mlO2g-1hod-1 in the thermoneutral zone 27-34°C. We did not confirm poikilotermic traits in this species, because body temperature was stable (33.0 {$\pm$} 0.5°C) at low ambient temperatures. The pups started to thermoregulate in age of one month and they are able to maintain stable body temperature very late in age of three months. My results indicate that presence of adults is necessary for thermoregulation of pups.
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