| toxoplasmosis in dasyurid marsupials. | during a histopathologic survey of 240 dasyurid marsupials a high prevalence of infection of toxoplasma gondii was found in eight of thenine species examined. amongst the infected species, endemic infection in field animals was proved in dasyuroides byrnei, but there was also good evidence of laboratory infection probably derived from raw sheep tissues in their diet. infection was never demonstrated in animals less than six months of age. the 21 antechinus stuartii examined remained free from in ... | 1975 | 1195500 |
| acuariid, capillariid and hymenolepidid parasites of the dasyurid marsupial antechinus stuartii macleay, 1841, from southeastern australia. | stammerinema suffodiax sp. n. is described from the dasyurid marsupial antechinus stuartii. it differs from s. soricis, the only other member of the genus, in lacking lateral body spines, as well as in the spicules and characters of the anterior extremity. as well as redescribing synhimantus australiensis (johnston and mawson, 1952) now collected from the stomach of a. stuartii, a new capillariid, capillaria rickardi from the stomach and two cestodes hymenolepis aklei sp. n. and h. bradleyi sp. ... | 1975 | 1206212 |
| late postnatal development and differentiation of the ductus epididymidis in a dasyurid marsupial (antechinus stuartii). | the general histology and ultrastructural features of the developing ductus epididymidis were examined in the brown marsupial mouse, antechinus stuartii, from april, when males were sexually immature, until august, when the adult males were involved in mating activities, just prior to the annual male die-off. samples were also examined 3 and 6 months after the august die-off period in males kept in isolation from conspecifics during the prebreeding and breeding periods. in april, tubule diameter ... | 1992 | 1416075 |
| transport and storage of spermatozoa in the female reproductive tract of the brown marsupial mouse, antechinus stuartii (dasyuridae). | female brown marsupial mice were mated and changes in the number and distribution of spermatozoa were assessed in several regions of the reproductive tract at 1, 2, 3, 7, 10, 14 and 18 days after mating. approximately 40 x 10(3) spermatozoa/side were present in the female reproductive tract between days 1 and 7 after a single mating. this had decreased (to approximately 9 x 10(3) spermatozoa/side) by days 10 and 14 after mating; by day 18 no spermatozoa were recovered. the maximum number of sper ... | 1991 | 1920303 |
| effects of breeding season and mating on total number and distribution of spermatozoa in the epididymis of the brown marsupial mouse, antechinus stuartii. | changes in the number and distribution of spermatozoa in the epididymis of the adult brown marsupial mouse were examined during july/august in mated and unmated males. the effects of mating on epididymal sperm populations were studied in 2 groups of males each mated 3 times and compared with the number and distribution of spermatozoa in the epididymides of 4 unmated control groups. one testis and epididymis were removed from each animal (hemicastration) either before or early in the mating seaso ... | 1990 | 2313656 |
| structural features of the epididymis in a dasyurid marsupial (antechinus stuartii). | the ductus epididymidis of the marsupial mouse antechinus stuartii was divided into caput, corpus, and caudal regions using several constant morphological landmarks. tubule diameter and epithelial height increased gradually from caput to cauda. in contrast, the surface area of the lumen of the ductus epididymidis increased to a maximum in the distal caput region, but decreased markedly in the distal cauda in association with characteristic changes in lumen shape (from circular to slit-shaped) an ... | 1989 | 2805043 |
| x chromosome inactivation in female embryos of a marsupial mouse (antechinus stuartii). | blastocysts and late gestation stages of the marsupial mouse, antechinus stuartii, were examined cytologically and electrophoretically to investigate x chromosome activity during embryogenesis. a late replicating x chromosome was identified in the protoderm cells of female unilaminar blastocysts and in the cells of embryonic and extra-embryonic regions of older blastocysts. sex chromatin bodies were also observed in female bilaminar and trilaminar blastocysts. the x linked enzyme alpha-galactosi ... | 1987 | 2824142 |
| cytomegalovirus infection of the prostate in the dasyurid marsupials, phascogale tapoatafa and antechinus stuartii. | infection by a herpesvirus producing cytomegalic disease in the prostate was demonstrated in the dasyurid marsupials, phascogale tapoatafa and antechinus stuartii. the prevalence of lesions among the latter was highest in mature animals during breeding, when the animals are known to be under stress, and in animals treated daily with high levels of exogenous corticosteroid. occasional cytomegaly was observed in the kidneys of some a. stuartii and may represent a site of latent infection. virus pa ... | 1981 | 6273599 |
| cleavage in vivo and in culture in the dasyurid marsupial antechinus stuartii (macleay). | cleavage in the brown marsupial mouse, antechinus stuartii, from the zygote to the unilaminar blastocyst, was observed in vivo and in culture and in sections of embryos. the first three divisions were meridional and passed from the yolk pole to the opposite pole. deutoplasmolysis, resulting in a distinct yolk mass, occurred during the first two divisions. prior to the third and fourth divisions, the blastomeres elongated and flattened against the zona pellucida. the fourth division was latitudin ... | 1983 | 6343619 |
| water drinking and the effect of angiotensin and renin in a dasyurid marsupial (antechinus stuartii). | marsupial mice, antechinus stuartii, were given intraperitoneal (ip) injections of 1-30 micrograms of val5-angiotensin ii amide to determine whether it had any effect on thirst. drinking in the first hour after injection and measured water intake over 2 and 24 hr were not substantially increased compared with controls. intraperitoneal injection of sheep renin had no effect on water intake. water deprivation increased 2- and 24-hr water intake. sheep renin and val5-angiotensin ii amide elicited p ... | 1983 | 6365683 |
| stress related involution of lymphoid tissues in australian marsupial mice. | involution of the thoracic thymus in two species of marsupial mouse, antechinus swainsonii (waterhouse) and antechinus stuartii (macleay) was shown to be unrelated to corticosteroid action and to be complete before puberty. a stress response in male marsupial mice is caused by an androgen related drop in the plasma corticosteroid binding globulin concentration which gives rise to an increase in the plasma free glucocorticoid concentration. the high concentrations of free glucocorticoids in the p ... | 1984 | 6735432 |
| factors influencing pre-natal fertility in the brown marsupial mouse, antechinus stuartii. | the number of eggs ovulated per ovary, estimated as the number of corpora lutea in histological sections, was 6.1 +/- 1.4 (s.d.) in 100 sides of the reproductive tract in 53 female antechinus stuartii during 5 breeding seasons. post-ovulatory fertility, estimated as the number of normal embryos divided by the number of corpora lutea, was 74 +/- 25% (s.d.). by analysis of variance the number of corpora lutea per ovary did not vary significantly with the year of breeding or the origin of the femal ... | 1983 | 6864648 |
| the prevalence of anti-leptospiral agglutinins in sera of wildlife in southeastern australia. | anti-leptospiral agglutinins were found in the serum from 18 (7 species) of 419 (25 species) animals sampled from various areas of southeastern australia. positive serologic reactions were observed in 5 of 25 (20%) brush-tailed possum (trichosurus vulpecula), 1 of 26 (3.8%) tammar wallaby (macropus eugenii), 2 of 12 (16.7%) swamp wallaby (wallabia bicolor), 1 of 3 (33.3%) koala (phascolarctos cinereus), 3 of 41 (7.3%) common wombat (vombatus ursinus), 2 of 100 (2%) bush rat (rattus fuscipes) and ... | 1981 | 7241704 |
| embryonic development in culture of the marsupials antechinus stuartii (macleay) and sminthopsis macroura (spencer) during preimplantation stages. | forty-nine blastocysts from 11 brown antechinus, antechinus stuartii, and 96 blastocysts from 17 stripe-faced dunnarts, sminthopsis macroura, were used to develop a culture system for embryos during preimplantation stages. blastocysts of brown antechinus were collected on days 6-9 for unilaminar stages, days 16-21 for bilaminar stages and days 20 and 21 for trilaminar stages. blastocysts of stripe-faced dunnarts were collected on day 6 for unilaminar stages, days 6-8 for bilaminar stages and day ... | 1993 | 8153394 |
| testicular and epididymal development in the brown marsupial mouse, antechinus stuartii (dasyuridae, marsupialia). | reproductive tissues were collected monthly from male antechinus stuartii during the first 5 months of post-partum development, a period corresponding to the time between birth and the initial increase in plasma androgen above non-detectable levels. the gonad appeared undifferentiated at day 3 after birth, but the basic structure of the testis (tunica albuginea, sex cords, stroma) was well established at 1 month of age. at this stage the developing sex cords contained a single layer of pre-serto ... | 1993 | 8214626 |
| characterization of a marsupial glutathione transferase, a class alpha enzyme from brown antechinus (antechinus stuartii). | the major form of glutathione transferase from the marsupial antechinus stuartii has been purified and characterized as an alpha class enzyme (ast gst a1-1) with distant sequence relationships to other class alpha sublines, compatible with the early origin of marsupials. amino acid replacements toward the closest enzyme characterized (chicken, form a3) involve no less than 79 positions (36%). at the active site, as deduced from comparisons with the known tertiary structure of the corresponding h ... | 1997 | 9109421 |
| purification and characterization of hepatic glutathione transferases from an insectivorous marsupial, the brown antechinus (antechinus stuartii). | 1. five unique glutathione transferase isoenzymes were purified from the hepatic cytosol of an insectivorous marsupial, the brown antechinus. the purified gsts were characterized by structural and catalytic properties including apparent molecular weight and isoelectric point, specificity towards model substrates, kinetic parameters, sensitivity to inhibitors and cross-reactivity with antisera raised against human gsts. 2. an alpha class gst, antechinus gst 1-1, predominated in the hepatic cytoso ... | 1997 | 9211657 |
| isolation and partial characterization of tammar wallaby luteinizing hormone and development of a radioimmunoassay. | tammar wallaby (macropus eugenii) luteinizing hormone (lh) was purified from pituitaries collected from wild and captive populations by salt sequential precipitation, ion exchange chromatography and gel filtration. pituitary tissue (5 g) yielded 1.8 mg of purified wallaby luteinizing hormone (me-14b), as verified by sodium dodecyl sulfate polyacrylamide gel electrophoresis (sds-page). a heterologous radioimmunoassay has been developed for measurement of lh in plasma of marsupials using a monoclo ... | 1997 | 9402258 |
| post-mating sexual selection increases lifetime fitness of polyandrous females in the wild. | females often mate with several males before producing offspring. field studies of vertebrates suggest, and laboratory experiments on invertebrates confirm, that even when males provide no material benefits, polyandry can enhance offspring survival. this enhancement is widely attributed to genetic benefits that arise whenever paternity is biased towards males that sire more viable offspring. field studies suggest that post-mating sexual selection biases fertilization towards genetically more com ... | 2006 | 17080089 |
| cortical cyto- and chemoarchitecture in three small australian marsupial carnivores: sminthopsis macroura, antechinus stuartii and phascogale calura. | the cyto- and chemoarchitecture of the cerebral cortex has been examined in three small (mouse-sized) polyprotodont marsupial carnivores from australia (the stripe-faced dunnart, sminthopsis macroura; the brown antechinus, antechinus stuartii; and the red-tailed phascogale, phascogale calura) in order to compare the cortical topography of these marsupials with that of diprotodontids, didelphids and eutherians. all three species studied had similar cortical cytoarchitecture. the isocortical surfa ... | 2008 | 18946209 |
| mammalian hair as an accumulative bioindicator of metal bioavailability in australian terrestrial environments. | the current study represents the first investigation of the suitability of marsupial and eutherian mammalian hair as indicator tissue for metal exposure and accumulation within contaminated australian terrestrial ecosystems. a soil metal contamination gradient was established across 22 sites at increasing distances from a decommissioned lead/zinc smelter in nsw, australia. within each site, soil and small mammal populations were sampled. an australian native marsupial, the insectivorous brown an ... | 2009 | 19232676 |
| population and behavioural responses of native prey to alien predation. | the introduction of invasive alien predators often has catastrophic effects on populations of naïve native prey, but in situations where prey survive the initial impact a predator may act as a strong selective agent for prey that can discriminate and avoid it. using two common species of australian small mammals that have persisted in the presence of an alien predator, the european red fox vulpes vulpes, for over a century, we hypothesised that populations of both would perform better where the ... | 2011 | 22042524 |
| development in vitro of investment-free marsupial embryos during cleavage and early blastocyst formation. | twenty embryos at the cleavage-arrested four-cell stage of the brown antechinus, antechinus stuartii, were used to develop a method to obtain investment-free embryos by incubation at 35 degrees c in 2.5% pancreatin, 0.05% trypsin, and 0.05% pronase. control intact embryos and the investment-free embryos were incubated in dulbecco's modified eagle's medium with high glucose and 10% foetal calf serum in 5% co2 in air at 35 degrees c for 48 h. release of embryos from the investments (shell, mucoid, ... | 2009 | 2777174 |
| time-lapse analysis and normal stages of development of cleavage and blastocyst formation in the marsupials the brown antechinus and the stripe-faced dunnart. | the first six normal stages of cleavage and blastocyst formation in vitro of the brown antechinus and the stripe-faced dunnart are described based on 429 embryos from 37 dunnarts and 143 embryos from 32 antechinus and an information from previous studies. embryos were cultured in dulbecco's modified eagle's medium with high glucose and 10% foetal calf serum at 35 degrees c and 5% co2 in air. seven antechinus and 18 dunnart embryos were cultured in rose chambers and filmed by time-lapse cinematog ... | 2008 | 2346646 |
| torpor in free-ranging antechinus: does it increase fitness? | antechinus are small, insectivorous, heterothermic marsupial mammals that use torpor from late summer to early winter and reproduce once a year in late winter/early spring. males die after mating, most females produce only a single litter, but some survive a second winter and produce another litter. as it is not known how these females manage to survive the second winter after the energetically demanding reproductive period and then reproduce a second time, we aimed to provide the first data on ... | 2014 | 24441710 |
| marsupial cardiac myosins are similar to those of eutherians in subunit composition and in the correlation of their expression with body size. | cardiac myosins and their subunit compositions were studied in ten species of marsupial mammals. using native gel electrophoresis, ventricular myosin in macropodoids showed three isoforms, v(1), v(2) and v(3), and western blots using specific anti-alpha- and anti-beta-cardiac myosin heavy chain (myhc) antibodies showed their myhc compositions to be alphaalpha, alphabeta and betabeta, respectively. atrial myosin showed alphaalpha myhc composition but differed from v(1) in light chain composition. ... | 2007 | 16988832 |
| phenotypic plasticity of post-fire activity and thermal biology of a free-ranging small mammal. | ecosystems can change rapidly and sometimes irreversibly due to a number of anthropogenic and natural factors, such as deforestation and fire. how individual animals exposed to such changes respond behaviourally and physiologically is poorly understood. we quantified the phenotypic plasticity of activity patterns and torpor use - a highly efficient energy conservation mechanism - in brown antechinus (antechinus stuartii), a small australian marsupial mammal. we compared groups in densely vegetat ... | 2016 | 27001165 |
| distribution of cart (cocaine- and amphetamine-regulated transcript) peptide in mature and developing marsupial brain. | cart (cocaine- and amphetamine-regulated transcript) is a neuromodulator involved in feeding, drug reward, stress and cardiovascular function. we have immunohistochemically studied the distribution of the cart peptide in the brains of two adult marsupial species: the brown antechinus (antechinus stuartii) as a representative of polyprotodont marsupials and the tammar wallaby (macropus eugenii) as a representative of diprotodont marsupials. we have also examined the distribution of cart during po ... | 2010 | 20881368 |
| sex, season and melatonin administration affects daily activity rhythms in a marsupial, the brown antechinus, antechinus stuartii. | the carnivorous marsupial antechinus stuartii relies on photoperiodic changes to time reproductive activities, including behaviour, in spring. similar to other mammals, the administration of the hormone melatonin is known to affect the synchronisation of reproduction in a. stuartii. the present study sought to explore the alterations in locomotor activity from the winter solstice in both males (body mass 35 g) and females (body mass 20 g) as a result of the influences of the changes in the natur ... | 2008 | 17884113 |
| size breeds success: multiple paternity, multivariate selection and male semelparity in a small marsupial, antechinus stuartii. | mating in the marsupial genus antechinus is a synchronous annual event that is characterized by monoestry in females and abrupt postmating mortality in males. male semelparity (multiple copulations during a single breeding season per lifetime) is often assumed to occur as a consequence of the intense mating effort expended by males in the rut, but the forces selecting for this remain elusive. here, we investigate selection in male brown antechinus, antechinus stuartii, and test two hypotheses fo ... | 2006 | 16968281 |
| the seasonal reproductive cycle of a marsupial, antechinus stuartii: effects of oral administration of melatonin. | antechinus stuartii is a small marsupial with a brief, highly synchronised mating period believed to be controlled by the rate of change of photoperiod. two experiments were performed to explore aspects of photoperiodic control of the seasonal cycle. in the first experiment the pineal hormone, melatonin, administered in the drinking water from the winter solstice, changed the normal response of a. stuartii to increasing rate of change of photoperiod. melatonin administration shifted the inductio ... | 2002 | 12270791 |
| the effects of cortisol and testosterone on renal function in male antechinus stuartii (marsupialia). | seasonal changes in the physiology of antechinus stuartii result in complete male mortality after mating. the most important endocrine changes in males are large rises in plasma testosterone and cortisol concentrations. glomerular filtration rate (gfr) in males declines coincident with high plasma testosterone and cortisol. in the present study gfrs were measured in males captured in may (when endogenous plasma testosterone and cortisol levels are low) and given depot injections of either saline ... | 1998 | 9646501 |
| effect of testosterone and cortisol administration on the reproductive tract of male antechinus stuartii (marsupialia). | the life history of antechinus stuartii, a marsupial, is highly synchronized and culminates in a brief mating period that is followed by complete male mortality. the accessory reproductive tracts of male a. stuartii enlarge in association with testosterone and cortisol hormone concentrations, but this appears to be unrelated to the spermatogenic cycle. the present study examined the effects of testosterone and cortisol on the male reproductive tract. four groups of adult males from may (when pla ... | 1998 | 9640258 |
| seasonal changes in glomerular filtration rate in antechinus stuartii (marsupialia: dasyuridae). | the small marsupial antechinus stuartii experiences a synchronised life cycle that culminates in complete male mortality (within 3 weeks) following the 1 week mating period in mid-august (late winter). there are pronounced physiological changes in male a. stuartii over the life cycle and renal function was assessed for correlation with these changes. glomerular filtration rate and urine and plasma electrolytes were determined in male and female a. stuartii in february, may, july and august. fema ... | 1998 | 9503640 |
| effects of testosterone and cortisol on the renal morphology of male antechinus stuartii (marsupialia). | the life cycle of the marsupial antechinus stuartii includes postmating mortality of all males. a previous study found that renal morphology changes during the yearly cycle when endogenous concentrations of testosterone and cortisol are elevated in males. the present study determined whether administration of testosterone only, cortisol only, or testosterone plus cortisol affects renal structure in males at a time of year when endogenous hormones are low (may). saline administration was used as ... | 1997 | 9268625 |
| early cleavage to formation of the unilaminar blastocyst in the marsupial antechinus stuartii: ultrastructure. | the development of antechinus stuartii from the 2-cell stage to the blastocyst stage in vivo was examined by routine transmission electron microscopy. the 2-8-cell stages had a similar organization of organelles, whereas the 16- to 32-cell stages had pluriblast cells and trophoblast cells forming an epithelium closely apposed to the zona pellucida. specialized cell-zona plugs were formed at the 8-cell stage, and primitive cell junctions appeared in later conceptuses. the cytoplasmic organelles i ... | 1997 | 9208430 |
| the type and differentiation of cells in vitro from unilaminar and bilaminar blastocysts of two marsupials, antechinus stuartii and sminthopsis macroura. | the type and ability to differentiate in vitro of cells found in blastocysts of two marsupials were examined. thirteen unilaminar blastocysts on day 7 to day 12 of gestation and 24 bilaminar blastocysts on day 16 and day 18 of gestation were collected from 11 brown antechinus, antechinus stuartii. a total of of 77 unilaminar blastocysts on day 5 and day 6 of gestation and a total of 61 bilaminar blastocysts on day 6 and day 7 of gestation were collected from 40 stripe-faced dunnarts, sminthopsis ... | 1996 | 8870095 |
| body temperature rhythms and activity in reproductive antechinus (marsupialia). | to determine whether locomotor activity and body temperature (tb) rhythms change during the mating season of male antechinus stuartii and whether that could contribute to postmating die-off, we measured both variables in individuals kept in the laboratory under natural photoperiod. before the mating season antechinus were mainly nocturnal. however, during the mating period (end of august) males showed a markedly elevated activity level and some animals extended their activity period well into th ... | 1995 | 7667424 |
| uterine histology of the dasyurid marsupial, antechinus stuartii: relationship with differentiation of the embryo. | uterine samples from antechinus stuartii on days 1, 4, 6, 8, 11, 13, 15, 18, 21 and 23 after ovulation were examined histologically. animals were pregnant, nonpregnant and unmated, or nonpregnant and mated but found to have only unfertilized eggs on autopsy. the histological parameters used were thickness of the myometrium, endometrial stroma, and endometrial epithelium, and density of uterine stromal glands and of lymphocytes at the endometrial basal lamina. overall, the fluctuation patterns of ... | 1993 | 8283444 |
| mechanisms of competition among insectivorous mammals. | this study investigates the mechanisms of competition between congeneric pairs of insectivorous mammals in two communities in australia and england. direct field observations showed that physical interactions between species do not occur, whereas conspecific encounters are frequent. in field enclosures the smaller, subordinate species in each community (antechinus stuartii: marsupialia: sorex minutus: eutheria) remained alert in the presence of the dominant species (a. swainsonii, s. araneus), a ... | 1991 | 28312492 |
| plasma progesterone concentrations during pregnancy in the dasyurid marsupial, antechinus stuartii: relationship with differentiation of the embryo. | antechinus stuartii females were sacrificed at various stages of pregnancy timed from the first day that epithelial cell numbers declined in the urine (day 0). embryos were recovered and their developmental stage assessed, corpora lutea (cl) were fixed for histological sections and the plasma was taken for progesterone determination. the rate of development of the embryo appeared to parallel the formation of the cl and the plasma progesterone concentrations: cleavage (less than day 6) and the ex ... | 1990 | 2333389 |
| an unusual mode of progressive motility in spermatozoa from the dasyurid marsupial, antechinus stuartii. | | 1990 | 2333385 |
| daily torpor and thermoregulation in antechinus (marsupialia): influence of body mass, season, development, reproduction, and sex. | season and body mass influence torpor in mammals. however, the effects of the two factors are often difficult to distinguish because body mass in many species changes with season. the present study attempted to separate seasonal and body mass related alterations of torpor. adult female antechinus stuartii and a. flavipes (marsupialia), which were about half the size of males of the respective species, showed longer and deeper torpor than males. when the two species were compared, torpor in a. st ... | 1988 | 28311957 |
| relationship between longevity of spermatozoa after insemination and the percentage of normal embryos in brown marsupial mice (antechinus stuartii). | twenty-six female brown marsupial mice in a laboratory colony were mated at intervals ranging from 1 to 20 days between coitus and ovulation. the numbers of corpora lutea and normal embryos were counted. a multiple regression model examined the parabolic relationship between the proportion of normal embryos and the time from coitus to ovulation. the proportion of normal embryos increased until a mean of 9.5 days and decreased thereafter. this relationship was independent of the year of breeding ... | 1987 | 3572881 |
| an experimental manipulation of the intensity of interspecific competition: effects on a small marsupial. | an investigation was made of the effects of reducing and enhancing the intensity of competition on a small marsupial, antechinus stuartii, from a larger and competitively dominant congener, a. swainsonii. populations of these species were monitored in two study areas (one control, one experimental) in forest near canberra, australia, between february and july in 1980 and 1981. in the experimental study area in 1980 i reduced the numbers of a. swainsonii relative to a. stuartii (thus reducing the ... | 1986 | 28311495 |
| cleavage in vitro following destruction of some blastomeres in the marsupial antechinus stuartii (macleay). | the effect of destruction of some blastomeres on subsequent cleavage in vitro was investigated in the marsupial antechinus stuartii. blastomeres were killed by puncturing with a fine glass needle. the positions of the punctured and surviving blastomeres were recorded with respect to the yolk mass and defects on the shell membrane. blastomeres were punctured in 2-cell, 4-cell, 14-cell, 16-cell and 22-cell embryos. subsequent development of the embryos was followed in vitro. embryos developed at a ... | 1986 | 3723068 |
| the role of photoperiod in the timing of reproduction in the dasyurid marsupial antechinus stuartii. | antechinus stuartii has one highly synchronized mating period which occurs at the same time each year. an analysis of the time of reproduction in 162 populations of a. stuartii shows that the onset of the mating period is correlated with the rate of change of photoperiod, rather than with critical photoperiodic length. the rate of change of photoperiod is different for two designated forms of this species and can be used as a predictor of these animals' reproductive timing. a rate of change mode ... | 1986 | 28310137 |
| a novel structure in the stomach and intestine of two species of australian marsupial mice. | a tubular or sac-like structure with a well defined lumen which occasionally contained parasites was found in the outer muscle wall of the small and large intestine in 32 out of 40 male and 35 of 40 female marsupial mice of the two species, antechinus swainsonii and antechinus stuartii (macleay). a similar structure was also found in the muscle layers of the stomach in 5 marsupial mice of both species. the cellular matrix of the structure appeared to be composed of randomly organized macrophage- ... | 1984 | 6470235 |
| the gut-associated lymphoid system of two species of australian marsupial mice, antechinus swainsonii and antechinus stuartii. distribution, frequency and structure of peyer's patches and lymphoid follicles in the small and large intestine. | the distribution and number of peyer's patches (5) in two species of marsupial mice, antechinus swainsonii and antechinus stuartii was found to be the same even though the length of the intestine in the latter species was half that of the former. both species lack a caecum and appendix. the position of the peyer's patches is unusual in that the first three peyer's patches are on the right side of the small intestine whereas the penultimate and ultimate peyer's patches are large, contain many lym ... | 1984 | 6743144 |
| a test of a competition model with reference to three species of small mammals in south-eastern australia. | this study tests the hypothesis that competition occurs in a community of three species of small mammals (antechinus stuartii and a. swainsonii, marsupialia; rattus fuscipes, rodentia) in south-eastern australia. the hypothesis was tested by using a simple model of competition that is based on two premises: i. competition results in a negative numerical or a negative spatial association between species, and ii. competition is more intense where the densities of the competing species are relative ... | 1983 | 28310546 |
| delayed embryonic development in the dasyurid marsupial, antechinus stuartii. | | 1981 | 6939868 |
| stress and mortality in a small marsupial (antechinus stuartii, macleay). | | 1980 | 6245013 |
| marsupial cells in long-term culture. | cell lines have been developed from several species of australian marsupials and studied during long-term growth. cell lines developed from macropodid skin or heart tissues all had reproducible finite life-spans. however, cell lines developed from dasyurids showed bariable behavior in culture: lines developed from antechinus stuartii and dasyurus viverrinus had finite life-spans, while lines developed from sminthopsis crassicaudata had indefinite life-spans. s. crassicaudata lines usually became ... | 1977 | 559639 |
| torpor in the dasyurid marsupial antechinus stuartii. | | 1976 | 3311 |
| a study of the behaviour of caged antechinus stuartii. | | 1972 | 4674160 |
| development of the teeth in a pouch-young specimen of antechinus stuartii and a pouch-young specimen of sminthopsis crassicaudata. dasyuridae: marsupialia. | | 1969 | 5252186 |
| atypical giant cells in antechinus stuartii due to demodicid mites. | | 1965 | 5847004 |
| pathology in antechinus stuartii (marsupialia) due to demodex sp. | | 1965 | 14342131 |
| can remote infrared cameras be used to differentiate small, sympatric mammal species? a case study of the black-tailed dusky antechinus, antechinus arktos and co-occurring small mammals in southeast queensland, australia. | the black-tailed dusky antechinus (antechinus arktos) is an endangered, small carnivorous marsupial endemic to australia, which occurs at low population density along with abundant sympatric populations of other small mammals: antechinus stuartii, rattus fuscipes and melomys cervinipes. using a. arktos as a model species, we aimed to evaluate the effectiveness of infrared digital camera traps for detecting and differentiating small mammals and to comment on the broad applicability of this method ... | 2017 | 28792958 |
| post-fire recovery of torpor and activity patterns of a small mammal. | to cope with the post-fire challenges of decreased availability of food and shelter, brown antechinus (antechinus stuartii), a small marsupial mammal, increase the use of energy-conserving torpor and reduce activity. however, it is not known how long it takes for animals to resume pre-fire torpor and activity patterns during the recovery of burnt habitat. therefore, we tested the hypothesis that antechinus will adjust torpor use and activity after a fire depending on vegetation recovery. we simu ... | 2017 | 28515330 |
| the importance of mammalian torpor for survival in a post-fire landscape. | wildfires have increased in frequency and intensity worldwide with climate change as a main driving factor. while a number of studies have focused on population changes in regard to fires, there are essentially no quantitative data on behavioural and physiological adjustments that are vital for the persistence of individuals during and after fires. here we show that brown antechinus, a small insectivorous marsupial mammal, (i) endured a prescribed fire in situ, (ii) remained in their scorched ho ... | 2015 | 26063748 |
| responding to the weather: energy budgeting by a small mammal in the wild. | energy conservation is paramount for small mammals because of their small size, large surface area to volume ratio, and the resultant high heat loss to the environment. to survive on limited food resources and to fuel their expensive metabolism during activity, many small mammals employ daily torpor to reduce energy expenditure during the rest phase. we hypothesized that a small terrestrial semelparous marsupial, the brown antechinus antechinus stuartii, would maximize activity when foraging con ... | 2020 | 32467700 |
| seasonal changes in the reproductive anatomy of male antechinus stuartii (marsupialia: dasyuridae). | male antechinus stuartii (marsupialia: dasyuridae) undergo significant endocrinological changes during their life history. the endocrine changes are associated with complete male mortality. the accessory reproductive tract of males is important for seminal plasma production, and changes associated with the reproductive cycle were not described in detail by earlier studies. the present study sought to describe some of the seasonal changes in structure of the male accessory reproductive tract in r ... | 1997 | 29852601 |
| ultrastructure of early cleavage and yolk extrusion in the marsupial antechinus stuartii. | the fertilized egg and the two-cell stage and four-cell stage of the marsupial antechinus stuartii were studied by transmission electron microscopy. the features that make the fertilized egg of antechinus stuartii different from those of any eutherian mammal are (1) the presence of a shell and (2) the relatively large quantity and polarized distribution of cytoplasmic inclusions, including lipid, protein yolk bodies, and protein fibers. mitochondria and vesicles of smooth endoplasmic reticulum a ... | 1988 | 29895111 |