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1

Body composition and gut length of Akodon azarae [Muridae: Sigmodontinae]: relationship with energetic requirements

100%
Del V. J. C., Busch C.
Acta Theriologica
|
2003
|
tom 48
|
nr 3
Akodon azarae (J. Fischer, 1829) is a small omnivorous murid rodent that lives in environments with seasonal fluctuations of food. Seasonal variation in its body com­position and gut length, in relation to reproductive status, was studied. Physical Condition Index (PCI) and body composition showed seasonal differences, however, there were no differences in intestine length. The PCI was higher for both mature males and reproductive females compared to immature males and non-reproductive females. Lipid, protein and ash content showed differences in relation to reproductive status. The results suggest that A. azarae meets the additional costs of pregnancy and lactation by increasing energy intake, without relying on reserves.
2

Juvenile vocalizations of Ctenomys talarum [Rodentia: Octodontidae]

100%
Schleich C. E., Busch C.
Acta Theriologica
|
2002
|
tom 47
|
nr 1
We analysed the physical structure and functional interpretation of juvenile vocaliza­tions of Ctenomys talarum Thomas, 1898. Two sounds, one true vocalization (care- -elicitation call) and one mechanical sound (nursing sound) were recorded during the nestling period. Care-elicitation calls were emitted by isolated pups and caused the mother to respond by immediately approaching the pups to take care of them. This maternal response to the care-elicitation calls of C. talarum pups, together with the production of these vocalizations during the first weeks after birth, when pups depend exclusively on their mother to obtain food and maintain their body temperature, give preliminary support for the recent theory that care-elicitation cries are honest adver­tisements of offspring need.
3

Seasonality of breeding in wild tuco-tucos Ctenomys talarum in relation to climate and food availability

81%
Fanjul M. S., Zenuto R. R., Busch C.
Acta Theriologica
|
2006
|
tom 51
|
nr 3
283-293
The present work describes the association between environmental variables and reproductive seasonality in wild femaleCtenomys talarum Thomas, 1898. We assessed monthly variation in external reproductive features and vaginal smears of free-living females over a year-long period. We examined the relationship between frequency of lactating and pregnant females and temperature, plant biomass, plant water content, and rainfall (same month and 1 month prior) using path analysis. About 80% of the variance in the occurrence of pregnancy was explained by the model that included all of the above mentioned variables. Temperature had a direct negative effect on pregnancy. However, temperature had a positive effect on pregnancy through plant-water content and thus, positively influenced frequency of pregnancy. Although plant biomass was correlated with plant-water content, plant biomass had no significant effect on frequency of pregnancy. There were no effects (direct or indirect) of rainfall on pregnancy. The combination of vaginal smears and external features from free-living and autopsied females showed that reproductive activities occurred when new plant tissues were more abundant. Thus, enhanced energetic demands during gestation and lactation were assured. Moreover, births occurred when ambient temperatures provided a favorable thermal environment for pups that demonstrated poor thermoregulatory abilities during their initial phase of development.
4

Population and habitat characteristics of two sympatric species of Ctenomys (Rodentia: Octodontidae)

81%
Malizia A. I., Vassallo A. I., Busch C.
Acta Theriologica
|
1991
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tom 36
|
nr 1-2
5

A method for studying social and reproductive behaviour of subterranean rodents in captivity

81%
Zenuto R. R., Vassallo A. I., Busch C.
Acta Theriologica
|
2001
|
tom 46
|
nr 2
A methodology for studying the social and reproductive behaviour of solitary subterranean rodents under laboratory conditions is proposed. A first account of Ctenomys talarum (Thomas, 1898) behaviour is also provided with the aim of evaluating the proposed methodology and to advance presently unknown information on its social behaviour and mating system. The device is a seminatural enclosure, departing from traditional test cages with respect to increased: (1) size, (2) structural complexity, (3) social complexity, and (4) resemblance to natural conditions. It consists of artificial burrows each comprising 3.5 m of tunnel, a resource cage and a nest box, resembling the structural complexity described for C. talarum burrows. Burrows are connected to a common space, which allows social interaction among various individuals. Animals were observed in the seminatural enclosure - 3 females and 2 males, in accordance with sex ratios found in natural populations - for a period of 6 months. We obtained data related to reproductive and social behaviour: marking, aggression, vocalization, courtship and copulation, pregnancy, pup development, and parental care. The proposed system enables the collection of behavioural data as yet unavailable due to the secretive habits and aggressiveness that characterize this group of rodents, coupled with the difficulties associated with simulating subterranean conditions.
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