| the development of diabetes in the tuco-tuco (ctenomys talarum). | | 1974 | 4431790 |
| dna fingerprinting reveals polygyny in the subterranean rodent ctenomys talarum. | dna fingerprinting was used to characterize patterns of paternity in two populations of ctenomys talarum from buenos aires province, argentina. the multilocus probe pv47-2 was used to detect variation in genomic dna extracted from 12 females, their 32 offspring, and 14 putative sires. for 11 out of 12 litters examined, a single male capable of providing all nonmaternal bands was identified. within each study population, individual males sired more than one litter, suggesting that c. talarum is p ... | 1999 | 10564459 |
| relationship between helminth parasites and demographic attributes of a population of the subterranean rodent ctenomys talarum (rodentla: octodontidae). | the helminth parasite fauna of a natural population of the octodontid, ctenomys talarum, was studied. parasites that were found included the nematodes heligmostrongylus sp. and trichuris sp. total prevalence of parasitism was 92.3%, mean intensity of infection was 22.7 worms, and mean abundance was 21 worms. prevalence and mean abundance of infection with heligmostrongylus sp. were higher in c. talarum males relative to females. ecological and physiological causes, as well as the mating system o ... | 2002 | 12537128 |
| the role of the subterranean rodent ctenomys talarum (rodentia: octodontidae) in the life cycle of taenia taeniaeformis (cestoda: taeniidae) in urban environments. | this work is the first report of subterranean rodent ctenomys talarum (rodentia: octodontidae) as intermediate host of taenia taeniaeformis in urban areas of mar de cobo (buenos aires province, argentina) and to experimentally reproduce in domestic dogs the adult stage of this parasite. prevalence, mean abundance and mean intensity of infection with t. taeniaeformis larvae in the liver and peritoneal cavity of c. talarum were 64%, 15.3 and 9.8, respectively. ten adults of t. taeniaeformis were o ... | 2004 | 15158554 |
| redescription of trichuris pampeana (nematoda: trichuridae) from the south american subterranean rodent ctenomys talarum thomas, 1898 (rodentia: octodontidae). | trichuris pampeana suriano and navone, 1994 (nematoda: trichuridae) is redescribed from voucher specimens from the type host ctenomys azarae thomas, 1903 (rodentia: octodontidae) and from parasites collected from 2 populations of the subterranean rodent c. talarum thomas, 1898 from mar de cobo and necochea, buenos aires province, argentina. after a revision of these nematodes, it was confirmed that the following characters were not considered in the original description: bacillary band, cells fr ... | 2005 | 15856885 |
| genetic structure in a solitary rodent (ctenomys talarum): implications for kinship and dispersal. | the genetic structure of a population provides critical insights into patterns of kinship and dispersal. although genetic evidence of kin structure has been obtained for multiple species of social vertebrates, this aspect of population biology has received considerably less attention among solitary taxa in which spatial and social relationships are unlikely to be influenced by kin selection. nevertheless, significant kin structure may occur in solitary species, particularly if ecological or life ... | 2005 | 15969731 |
| graphidioides subterraneus n. sp. (nematoda: trichostrongyloidea) from the south american subterranean rodent ctenomys talarum thomas, 1898 (rodentia: octodontidae). | a new nematode species, graphidioides subterraneus n. sp., found in the stomach of c. talarum from argentina is described. the new species more closely resembles g. mazzai lent & freitas, 1935, parasite of galea leucoblephara from argentina, and g. kravetzi sutton & durette-desset, 1995, parasite of holochilus brasiliensis from uruguay. it can be distinguished by shorter spicules, by the shape of the gubernaculum, by shorter uterine branches, and by a different number of ridges of the synlophe a ... | 2005 | 15991827 |
| new pudicinae (trichostrongylina, heligmosomoidea), pudica ctenomydis n. sp. parasite of ctenomys talarum (rodentia: octodontidae) from argentina. | a total of 138 nematodes were found in the small intestine of ctenomys talarum (octodontidae) from mar de cobo, argentina. a new nematode species, pudica ctenomydis n. sp., is described. the new species more closely resembles p. pujoli durette-desset, 1990, parasite of microcavia niata thomas, from bolivia. it can be distinguished from p. pujoli by the number of ridges and characteristics of the synlophe, the spicular morphology, differences in length between rays 9 and 10, and by the presence o ... | 2006 | 16378752 |
| phylogeographical structure in the subterranean tuco-tuco ctenomys talarum (rodentia: ctenomyidae): contrasting the demographic consequences of regional and habitat-specific histories. | in this work we examined the phylogeography of the south american subterranean herbivorous rodent ctenomys talarum (talas tuco-tuco) using mitochondrial dna (mtdna) control region (d-loop) sequences, and we assessed the geographical genetic structure of this species in comparison with that of subterranean ctenomys australis, which we have shown previously to be parapatric to c. talarum and to also live in a coastal sand dune habitat. a significant apportionment of the genetic variance among regi ... | 2007 | 17688545 |
| mounting a specific immune response increases energy expenditure of the subterranean rodent ctenomys talarum (tuco-tuco): implications for intraspecific and interspecific variation in immunological traits. | it was recently hypothesised that specific induced defences, which require substantial time and resources and are mostly beneficial against repeated infections, are more likely to be favoured in 'slow-living-pace' species. therefore, understanding how different types of immune defences might vary with life history requires knowledge of the costs and benefits of defence components. studies that have explored the energetic costs of immunity in vertebrates have done so with a focus primarily on bir ... | 2010 | 20154186 |
| mhc variation, multiple simultaneous infections and physiological condition in the subterranean rodent ctenomys talarum. | parasites and pathogens can play a significant role in shaping the genetic diversity of host populations, particularly at genes associated with host immune response. to explore this relationship in a natural population of vertebrates, we characterized major histocompatibility complex (mhc) variation in the subterranean rodent ctenomys talarum (the talas tuco-tuco) as a function of parasite load and ability to mount an adaptive immune response against a novel antigen. specifically, we quantified ... | 2011 | 21497205 |
| energy and distribution in subterranean rodents: sympatry between two species of the genus ctenomys. | the low basal metabolic rate (bmr) observed in subterranean rodents, compared to that of surface-dwelling species of comparable size, has been proposed to be an adaptation to underground life. two main hypotheses have been proposed to explain this finding, the cost of burrowing and the thermal stress. the former states that the low bmr is due to the high cost of extending the tunnel system whereas the other relates it to the possibility of overheating in burrows where evaporative and convective ... | 2007 | 17407828 |
| metabolic rate and thermoregulation in two species of tuco-tuco, ctenomys talarum and ctenomys australis (caviomorpha, octodontidae). | 1. resting metabolic rate and body temperature in function of ambient temperature were determined for two species of ctenomys. 2. oxygen consumption was lowest between 25 and 30 degrees c and was 0.946 +/- 0.030 and 0.968 +/- 0.022 in ctenomys talarum (from mar de cobo and necochea, respectively). resting metabolic rate was 0.343 +/- 0.053 at 30 c in c. australis. 3. mean rectal temperature at thermoneutrality was 36.1 +/- 0.13 and 37.3 +/- 0.17 in c. talarum and c. australis, respectively. 4. l ... | 1989 | 2573453 |
| retinal photoreceptors of two subterranean tuco-tuco species (rodentia, ctenomys): morphology, topography, and spectral sensitivity. | traditionally, vision was thought to be useless for animals living in dark underground habitats, but recent studies in a range of subterranean rodent species have shown a large diversity of eye features, from small subcutaneous eyes to normal-sized functional eyes. we analyzed the retinal photoreceptors in the subterranean hystricomorph rodents ctenomys talarum and ctenomys magellanicus to elucidate whether adaptation was to their near-lightless burrows or rather to their occasional diurnal surf ... | 2010 | 20737597 |
| food restriction affects inflammatory response and nutritional state in tuco-tucos (ctenomys talarum). | insufficient or unbalanced food intake typically has a negative impact on immune responses. the understanding of this effect is, however, hampered by the effect that food has on general condition, which, in turn, affects immunity, and the interaction among general condition, immunocompetence, and concurrent infections. the goal of this study was to determine the effects of food restriction and methionine supplementation on immunity in tuco-tucos (ctenomys talarum). effects of diet manipulations ... | 2016 | 28164466 |
| selective binocular vision loss in two subterranean caviomorph rodents: spalacopus cyanus and ctenomys talarum. | to what extent can the mammalian visual system be shaped by visual behavior? here we analyze the shape of the visual fields, the densities and distribution of cells in the retinal ganglion-cell layer and the organization of the visual projections in two species of facultative non-strictly subterranean rodents, spalacopus cyanus and ctenomys talarum, aiming to compare these traits with those of phylogenetically closely related species possessing contrasting diurnal/nocturnal visual habits. s. cya ... | 2017 | 28150809 |
| analysis of arch-like bones: the rodent mandible as a case study. | bone strength is determined by the mechanical properties of bone material, and the size and shape of the whole bone, i.e., its architecture. the mandible of vertebrates has been traditionally regarded as a beam oriented in relation to main masticatory loads, i.e., the longer dimension of its cross-section being parallel to the load. rodents follow this pattern but, in addition, their mandible possesses an intriguing arch-like shape that is apparent when seen in the lateral view. little attention ... | 2016 | 27059294 |
| parasite infection negatively affects pha-triggered inflammation in the subterranean rodent ctenomys talarum. | magnitude and effectiveness of immune responses vary greatly between and within species. among factors reported to determine this variation, parasitism is a critical one, although controversial effects of parasites over immunological indices have been reported. information regarding immune strategies in species with different life histories is crucial to better understand the role of immune defenses in an ecological and evolutionary context. here, we examine the influence of the parasite communi ... | 2016 | 26718121 |
| effect of ambient temperature on evaporative water loss in the subterranean rodent ctenomys talarum. | subterranean rodents face unique thermoregulatory challenges. evaporative water loss (ewl) is a crucial mechanism for maintaining heat balance in endotherms subjected to heat stress but also leads to potential dehydration. ewl depends on gradients of temperature and humidity between the surface of the individual and the surrounding environment. underground burrows generally provide a stable water vapor saturated atmosphere which may impede evaporative heat loss (ehl). this will mainly occur when ... | 2015 | 26590463 |
| short-term anxiety response of the subterranean rodent ctenomys talarum to odors from a predator. | | 2015 | 26343773 |
| immune challenge but not dietary restriction affects spatial learning in the wild subterranean rodent ctenomys talarum. | several lines of evidence suggest that learning and triggering an immune response are both metabolically expensive and thus likely to be subject to nutritional trade-offs between them and other competing demands. therefore, we evaluated if an immune challenge with a novel antigen affects spatial learning in the subterranean rodent ctenomys talarum under two different dietary conditions. the results showed that immune-challenged animals were affected in their spatial learning capabilities, increa ... | 2015 | 25446226 |
| chromosome synapsis and recombination in simple and complex chromosomal heterozygotes of tuco-tuco (ctenomys talarum: rodentia: ctenomyidae). | the chromosomal speciation hypothesis suggests that irregularities in synapsis, recombination, and segregation in heterozygotes for chromosome rearrangements may restrict gene flow between karyotypically distinct populations and promote speciation. ctenomys talarum is a south american subterranean rodent inhabiting the coastal regions of argentina, whose populations polymorphic for robertsonian and tandem translocations seem to have a very restricted gene flow. to test if chromosomal differences ... | 2014 | 24924853 |
| pha-induced inflammation is not energetically costly in the subterranean rodent ctenomys talarum (tuco-tucos). | immune activity has been proposed to be associated with substantial costs, due to trade-offs with other functions or activities that share common resources and contribute to an animal's fitness. however, direct estimates of the cost of mounting an immune response are few and have been performed mainly in birds. thus, further work is needed to clarify the relative costs of different components of the immune system and the role of environmental and life-history traits in modulating the costs of re ... | 2014 | 24905647 |
| assessing the energetic costs and trade-offs of a pha-induced inflammation in the subterranean rodent ctenomys talarum: immune response in growing tuco-tucos. | a traditional approach used to assess whether immune defense is costly is to explore the existence of trade-offs between immunity and other functions; however, quantitative studies of the energetic costs associated with the activation of the immune system are scarce. we assessed the magnitude of a pha-triggered immune response and the associated energetic costs in 60-day old ctenomys talarum. we expected that the magnitude of the macroscopic inflammatory response to pha is lower in young tuco-tu ... | 2014 | 24726606 |
| thermoregulatory development and behavior of ctenomys talarum pups during brief repeated postnatal isolation. | in altricial mammals, the role of the mother and siblings throughout pup's early ontogeny is critical to determine "normal" development in neonates. it has been reported that variations in parental investment during pups' development affect thermoregulatory capacity, growth patterns, brain development and behavior during lifetime, such as spatial learning and memory in adults. ctenomys talarum (tuco-tuco) is a solitary subterranean rodent, who inhabits complex burrows and exhibits developed spat ... | 2014 | 24667557 |
| postnatal ontogeny of limb proportions and functional indices in the subterranean rodent ctenomys talarum (rodentia: ctenomyidae). | burrow construction in the subterranean ctenomys talarum (rodentia: ctenomyidae) primarily occurs by scratch-digging. in this study, we compared the limbs of an ontogenetic series of c. talarum to identify variation in bony elements related to fossorial habits using a morphometrical and biomechanical approach. diameters and functional lengths of long bones were measured and 10 functional indices were constructed. we found that limb proportions of c. talarum undergo significant changes throughout ... | 2014 | 24643820 |
| parasitism underground: lice (insecta: phthiraptera) from ctenomys talarum (rodentia: ctenomyidae) along its coastal distribution in argentina. | species of south american subterranean rodents belonging to the genus ctenomys (commonly called tuco-tucos) are widely distributed across the southern neotropical region. despite their relatively well-studied biology and reproductive physiology, current knowledge of their ectoparasite fauna is limited to a few ambiguous studies, based on scattered samples from a small number of host individuals. ctenomys talarum is the most widely distributed species in the genus. lice (phthiraptera) were collec ... | 2014 | 26204034 |
| when allowed, females prefer novel males in the polygynous subterranean rodent ctenomys talarum (tuco-tuco). | the ability to recognize familiar conspecifics plays an important role at the time of choosing a mating partner in rodents. a laboratory study using preference test was used in order to test the hypothesis that, in the polygynous subterranean rodent ctenomys talarum, females prefer novel males when offered two odors, or individuals (one familiar and one novel) limited in their movements so that male aggression is prevented. our findings show that females prefer novel tuco-tucos at three levels o ... | 2013 | 23164625 |
| sexual selection in a polygynous rodent (ctenomys talarum): an analysis of fighting capacity. | the south american subterranean rodent genus ctenomys (caviomorpha: octodontoidea), which uses both claws and teeth to dig, shows striking morphological adaptations to its specialized mode of life. among other traits, the genus has evolved a powerful jaw musculature and procumbent incisors that are used for dento-excavation. behavioral observations indicate that these traits are also used during male aggressive encounters, which characterize the polygynous mating system of one of the species of ... | 2012 | 23040177 |
| maximal thermogenic capacity and non-shivering thermogenesis in the south american subterranean rodent ctenomys talarum. | subterranean rodents inhabit closed tunnel systems that are hypoxic and hypercapnic and buffer aboveground ambient temperature. in contrast to other strictly subterranean rodents, ctenomys talarum exhibits activity on the surface during foraging and dispersion and hence, is exposed also to the aboveground environment. in this context, this species is a valuable model to explore how the interplay between underground and aboveground use affects the relationship among basal metabolic rate (bmr), co ... | 2012 | 22614630 |
| differential responses of cortisol and corticosterone to adrenocorticotropic hormone (acth) in a subterranean rodent (ctenomys talarum). | we aimed to evaluate the responses of cortisol, corticosterone, and blood glucose to adrenocorticotropic hormone (acth) in males and females of the subterranean rodent ctenomys talarum and addressed interannual variations in the plasma levels of both hormones. the most important results indicate that: (1) cortisol positively responds to the acth signal but corticosterone does not, even though corticosterone levels were higher than cortisol concentrations, (2) plasma corticosterone concentrations ... | 2012 | 22514052 |
| histochemical and morphometric analyses of the musculature of the forelimb of the subterranean rodent ctenomys talarum (octodontoidea). | histochemical and morphometric analyses were performed to characterize the fibre-type composition of two forelimb muscles of the south american subterranean rodent ctenomys talarum. the studied muscles were the triceps lateralis, an extensor of the elbow, and the teres major, a flexor of the shoulder. it was found that these muscles had an elevated proportion of fast oxidative-glycolytic (fog) fibres, and lower proportions of slow oxidative (so) and fast glycolytic (fg) fibres. this composition ... | 2012 | 22309349 |
| validation of a radioimmunoassay for measuring testosterone concentrations in plasma samples of the subterranean rodent ctenomys talarum: outstandingly elevated levels in the wild and the effect of captivity. | we validated the coat-a-count radioimmunoassay (ria) kit for measuring testosterone in plasma samples of the subterranean rodent ctenomys talarum and evaluated testosterone levels in free-living and captive individuals. the performance of the assay was evaluated by the assessment of parallelism, accuracy and precision. moreover, the high specificity of the assay antibody was confirmed by high-pressure liquid chromatography with ultraviolet detector, followed by electrospray ionization tandem mas ... | 2011 | 21953744 |
| digestive flexibility in females of the subterranean rodent ctenomys talarum in their natural habitat. | we studied the occurrence of digestive strategies at different levels in females of the subterranean herbivorous rodent ctenomys talarum living in their natural habitat. we determined the dimensions of different parts of the gastrointestinal tract and organs along as the activity of key digestive enzymes(sucrase, maltase and n-aminopeptidase) in small intestine in females seasonally caught. females of c. talarum did not show seasonal variations in the mass of the different parts of the gastroint ... | 2011 | 21370482 |
| cortisol and corticosterone exhibit different seasonal variation and responses to acute stress and captivity in tuco-tucos (ctenomys talarum). | in this work we aimed to evaluate variations in plasma glucocorticoids (gcs, cortisol and corticosterone) levels throughout an annual cycle in free-living male tuco-tucos (ctenomys talarum) and compare their responses to acute and chronic stressors (trapping, manipulation, immobilization, confinement in a novel environment, transference to captivity). in addition, we used leukocyte profiles to allow discrimination between basal and stress-induced seasonal changes in gc concentrations. our result ... | 2011 | 21095193 |
| ontogeny of spatial working memory in the subterranean rodent ctenomys talarum. | while several works analyzed the spatial learning and memory capacities in adults of subterranean rodents, no study was done examining the development of these cognitive processes in pups of any of those species. therefore, the development of spatial working memory in the south american subterranean rodent ctenomys talarum was investigated by analyzing the pups' spatial performance in a delayed alternation task. when a short delay of 1 min was interposed between runs in the y-maze, 20-day-old pu ... | 2010 | 20806332 |
| effect of diet quality and soil hardness on metabolic rate in the subterranean rodent ctenomys talarum. | the present work is aimed to establish, in ctenomys talarum, the physiological and behavioral adjustments undergone by individuals when they are allowed to dig burrows in soils with different hardness and fed with diets of different quality. for each soil-diet combination, we estimated: resting metabolic rate (rmr), body temperature (t(b)), body mass, digestibility, food consumption rate, transit time, reingestion rate, feces production and time devoted to feeding, resting, locomotor activity an ... | 2009 | 19497381 |
| decreased glucose tolerance but normal blood glucose levels in the field in the caviomorph rodent ctenomys talarum: the role of stress and physical activity. | hystricomorph rodents have a divergent insulin molecule with only 1-10% of the biological activity in comparison to other mammalian species. in this study, we used the subterranean rodent ctenomys talarum as a model and performed blood glucose tolerance tests (gtts) with trained and untrained individuals to evaluate blood glucose regulation and the possible role of physical activity as a compensatory mechanism. additionally, we evaluated the variations in blood glucose during acute and chronic s ... | 2008 | 18644458 |
| digestive strategies in the south american subterranean rodent ctenomys talarum. | ctenomys talarum is a subterranean herbivorous rodent which due to its particular life style is frequently exposed to variations in surface environmental conditions (i.e. food quality and availability, temperature). thus, unlike other subterranean rodents, c. talarum has to buffer both the surface and burrow challenging environmental conditions. we studied the occurrence of digestive strategies at different levels of c. talarum living in their natural habitat. we determined the dimensions of dif ... | 2008 | 18562229 |
| nutritional responses to different diet quality in the subterranean rodent ctenomys talarum (tuco-tucos). | nutritional response to different diet quality was examined in the subterranean rodent ctenomys talarum (tuco-tuco). animals maintained in captive conditions were fed with three plant species that differed in their fibre content. tuco-tucos showed the ability to perform adjusts in short time lapse in response to diet quality; food ingestion, egestion and feces ingestion changed in animals under different plant species diets. time budget, mainly time devoted to feeding and activity accompanied su ... | 2007 | 17433887 |
| effect of tunnel inclination on digging energetics in the tuco-tuco, ctenomys talarum (rodentia: ctenomyidae). | burrows play an important role for many species, providing them with shelter and access to food resources. for subterranean rodents, living underground imposes constraints on morphology and physiology. the convergence in burrow architecture among subterranean rodents has been related to the energy demands imposed by the cost of constructing an entire system. the low frequency of tunnels with downward angles steeper than 40 degrees appears to be a common feature in burrow design. in the subterran ... | 2007 | 17021913 |
| seasonal changes in body composition of ctenomys talarum (rodentia: octodontidae): an herbivore subterranean rodent. | ctenomys talarum is a subterranean herbivorous rodent whose burrow systems exhibit particular characteristics, distinct from other subterranean environments. we studied seasonal variation in body composition of c. talarum in relation to energetic requirements. body lipid content seasonally changed in c. talarum, related to reproductive cycle and thermorregulatory mechanisms. a decrease in protein body content was found only in spring. ash content of females was lowest when most of them are in po ... | 2006 | 16793300 |
| energetics and thermoregulation during digging in the rodent tuco-tuco (ctenomys talarum). | for subterranean rodents, searching for food by extension of the tunnel system and maintenance of body temperature are two of the most important factors affecting their life underground. in this study we assess the effect of ambient temperature on energetics and thermoregulation during digging in ctenomys talarum. we measured vo2 during digging and resting at ambient temperature (ta) below, within, and above thermoneutrality. digging metabolic rate was lowest at ta within the thermoneutral zone ... | 2007 | 16458556 |
| causes of inter-individual variation in reproductive strategies of the parasitic nematode graphidioides subterraneus. | several factors capable of affecting the amount of resources available to an individual parasite, such as the number of other parasites in the host or host quality, may cause variability in reproductive success among parasites. variation in egg output and mean egg volume was investigated among adult females of the nematode graphidioides subterraneus, parasitic in the herbivorous subterranean rodent ctenomys talarum (octodontidae). female nematode body size correlated strongly with the number of ... | 2005 | 15924219 |
| use of chemical communication by the subterranean rodent ctenomys talarum (tuco-tuco) during the breeding season. | solitary subterranean rodents with a low frequency of direct contact between conspecifics are expected to use chemical communication to coordinate social and reproductive behavior. we examined whether reproductive tuco-tucos (ctenomys talarum) were able to discriminate the reproductive condition, sex, and source population of conspecifics by means of chemical cues contained in urine, feces, soiled shavings, or anogenital secretions. during preference tests in which animals had direct contact wit ... | 2004 | 15672659 |
| energetic expenditure during vocalization in pups of the subterranean rodent ctenomys talarum. | theoretical signaling models predict that to be honest, begging vocalizations must be costly. to test this hypothesis, oxygen consumption was measured during resting and begging (i.e., vocalizing) activities in pups of the subterranean rodent ctenomys talarum by means of open-flow respirometry. no statistical differences in individual oxygen consumption between resting and calling pups ranging in age from day 2 to day 20 were found. given these data, begging calls of c. talarum could not be cons ... | 2004 | 15452698 |
| thermoregulatory development in pups of the subterranean rodent ctenomys talarum. | the effect of the mother's contact and huddling with nest mates on the mass-specific metabolic rate (rmr) and body temperature (t(b)) of pups of ctenomys talarum from 2 to 45 days of age was evaluated at ambient temperatures (t(a)) within and below the adult thermoneutrality range (25 and 19 degrees c, respectively, the latter corresponding to the one recorded in burrows during the spring, when pups are born). under these conditions, we recorded the percentage of time that pups spent huddled wit ... | 2003 | 12834805 |
| bioenergetics of reproduction and pup development in a subterranean rodent (ctenomys talarum). | the objective of this study was to evaluate the maternal costs of reproduction and pup development in the subterranean rodent ctenomys talarum (thomas 1898). statistical differences were detected in whole-animal metabolic rates between nonreproductive and pregnant or lactating females. whole-animal metabolic rates during pregnancy and lactation were 128% and 151% of the resting metabolic rate (rmr) observed in nonreproductive females. the total additional energy cost of reproduction (above the n ... | 2006 | 12529848 |
| the diabetic syndrome in the tuco-tuco (ctenomys talarum). | | 1972 | 4558515 |
| implications of hyperglycaemia and cataract in a colony of tuco-tucos (ctenomys talarum). | | 1968 | 4878063 |
| variation in chromosome number within the genus ctenomys and description of the male karyotype of ctenomys talarum talarum thomas. | | 1966 | 5970175 |
| female choice, male dominance and condition-related traits in the polygynous subterranean rodent ctenomys talarum. | ctenomys talarum is a solitary and highly territorial species in which dominant males aggressively deter other males and monopolize reproductive activity. female preference for dominant males is not easy to assess due to coercive mating by males. hence, we aimed to answer if behavioural dominance and several condition-related traits like testosterone and cortisol levels, endoparasite load, and hematocrit volume may affect female preference when they have the opportunity to exert it. we designed ... | 2017 | 28591643 |
| do subterranean mammals use the earth's magnetic field as a heading indicator to dig straight tunnels? | subterranean rodents are able to dig long straight tunnels. keeping the course of such "runways" is important in the context of optimal foraging strategies and natal or mating dispersal. these tunnels are built in the course of a long time, and in social species, by several animals. although the ability to keep the course of digging has already been described in the 1950s, its proximate mechanism could still not be satisfactorily explained. here, we analyzed the directional orientation of 68 bur ... | 2018 | 30402349 |
| mandible strength and geometry in relation to bite force: a study in three caviomorph rodents. | the monophyletic group caviomorpha constitutes the most diverse rodent clade in terms of locomotion, ecology and diet. caviomorph species show considerable variation in cranio-mandibular morphology that has been linked to the differences in toughness of dietary items and other behaviors, such as chisel-tooth digging. this work assesses the structural strength of the mandible of three caviomorph species that show remarkable differences in ecology, behavior and bite force: chinchilla lanigera (a s ... | 2019 | 30768871 |
| personality underground: evidence of behavioral types in the solitary subterranean rodent ctenomys talarum. | animal personalities have been studied in a wide variety of taxa, but among rodents, available studies are relatively scarce and have focused mainly on social species. in this study, we evaluated the existence of personality in the solitary subterranean rodent ctenomys talarum. specifically, we aimed to test individual differences in behavior that are stable over time and context in males of c. talarum captured in the wild. | 2020 | 32110481 |
| differential antipredatory responses in the tuco-tuco (ctenomys talarum) in relation to endogenous and exogenous changes in glucocorticoids. | glucocorticoids participate in the behavioral and physiological responses generated under stressful circumstances coming from different sources-physical and/or psychological. in mammals, the increases of these hormones are mediated by the activation of the hypothalamic-pituitary-adrenal axis. this response occurs after exposure to novel and unpredictable situations that lead to the loss of homeostasis, for example, a direct encounter with predators or their cues. however, the relationship betwee ... | 2020 | 31784830 |
| functional morphology and identity of the thenar pad in the subterranean genus ctenomys (rodentia, caviomorpha). | as in many other fossorial tetrapods, the most obvious adaptations to scratch-digging in the subterranean tuco-tuco (rodentia, ctenomyidae, ctenomys) are found in the hands, which among other adaptations, present the mesaxonic condition; i.e. the central digits are more developed, and also their claws, which are curved and elongated. the thumb is atrophied and aligned with the rest of the digits, showing a small and flat claw. this configuration of digits and claws seems to be in accordance with ... | 2019 | 31373388 |
| diet effect on osmoregulation in the subterranean rodent ctenomys talarum. | water conservation requires osmoregulatory skills, sometimes limited by the environment and/or physiological and behavioral characteristics acquired along the evolutionary history of the species. fossoriality had probably emerged as a survival mechanism to face increasing aridity, as suggested for ctenomys, a genus that radiated to different environments. ctenomys talarum (tuco-tuco) is an herbivorous subterranean rodent that lives in coastal grasslands inside humid burrows that reduce evaporati ... | 2019 | 31176767 |
| assessment of trade-offs between simultaneous immune challenges in a slow-living subterranean rodent. | the coexistence of two or more infectious agents in the same host is common in nature. given this, the study of trade-offs within the immune system itself is key to understanding how immune defenses act in wild species in their natural environment. here we assessed the possible trade-off between an inflammatory response (induced by phytohemagglutinin [pha]; involving innate and adaptive responses in the study species) and an antibody response (induced by sheep red blood cells [srbc]; adaptive re ... | 2019 | 30601103 |
| prenatal predatory stress in a wild species of subterranean rodent: do ecological stressors always have a negative effect on the offspring? | in pregnant females, a failed predatory event not only induces individual responses but also represents a significant change in the developmental environment of the offspring, which may lead to modifications in their phenotype that may persist at different stages of life. we evaluate whether prenatal exposure to predatory cues affects anxiety behavior, behavioral response to predator cues, stress response to immobilization, and immune response to sheep red blood cells (srbc) and phytohemagglutin ... | 2018 | 29785708 |
| different regulation of cortisol and corticosterone in the subterranean rodent ctenomys talarum: responses to dexamethasone, angiotensin ii, potassium, and diet. | when harmful environmental stimuli occur, glucocorticoids (gcs), cortisol and corticosterone are currently used to evaluate stress status in vertebrates, since their secretions are primarily associated to an increased activity of the hypothalamic-pituitaryadrenal (hpa) axis. to advance in our comprehension about gcs regulation, we evaluated the subterranean rodent ctenomys talarum to assess cortisol and corticosterone response to (1) the negative feedback of the hpa axis using the dexamethasone ... | 2019 | 29782839 |