| comparative water economy of sympatric rodents in a chilean semi-arid habitat. | 1. water requirements, water balance components and dependence on exogenous water were estimated in four species of sympatric rodents inhabiting a chilean semi-arid region. 2. a significant increase in free water drinking was observed in all rodents when the diet composition was changed from 14 to 20% protein. 3. under water balance conditions the cricetid species (phyllotis darwini, oryzomys longicaudatus and akodon olivaceus) showed 1.66 to 1.88 times the weight-specific daily water gain of oc ... | 1988 | 2907435 |
| [comparison of 4 microscopy techniques for the diagnosis of leptospirosis in wild rodents in a rural area of valdivia, chile]. | kidneys of six different species of 93 wild rodents captured in the rural area of valdivia (chile) were simultaneously examined for leptospira infection by means of levaditi silver stain, dark ground microscopy in wet smears, and immunofluorescence and immunoperoxidase techniques using pooled antiserum against hardjo and pomona serovars. leptospira was shown to be present in 40 (43.0%) rodents. they were detected in five of the six species: akodon olivaceus, akodon longipilis, rattus rattus, ory ... | 1995 | 8850345 |
| testing models of diversification in mice in the abrothrix olivaceus/xanthorhinus complex in chile and argentina. | samples of the forest-dwelling mouse abrothrix olivaceus and the steppe-dwelling a. xanthorhinus across a transect between 45 and 47 degrees s in southern chile were analysed using the mitochondrial cytochrome b (cyt b) sequence, substantially adding to the data presented previously for these taxa from argentina and chile. the level of variation in the cyt b sequence throughout the entire olivaceus/xanthorhinus complex is comparable to that seen within a single species in many south american sig ... | 2001 | 11298954 |
| transmission study of andes hantavirus infection in wild sigmodontine rodents. | our study was designed to contribute to an understanding of the timing and conditions under which transmission of andes hantavirus in oligoryzomys longicaudatus reservoir populations takes place. mice were caged in test habitats consisting of steel drums containing holding cages, where seronegative rodents were exposed to wild seropositive individuals by freely sharing the same cage or being separated by a wire mesh. tests were also performed for potential viral transmission to mice from excreme ... | 2004 | 15479837 |
| short report: trypanosoma cruzi infection in wild mammals from a chagasic area of chile. | we report results of pcr-dna based detection of trypanosoma cruzi in wild mammal reservoirs from a chagasic area of chile. we analyzed 157 blood samples from wild mammals including the marsupial thylamis elegans and the rodents octodon degus, phyllotis darwini, and abrothrix olivaceus. in addition, 42 blood samples from goats (i.e., a peridomestic mammal) were analyzed. blood samples were used to extract dna, and pcr was performed using the amplification of minicircle dna sequences. southern ana ... | 2005 | 16172474 |
| description of a new species of haemogamasus (mesostigmata, laelapidae, haemogamasinae) from chubut, río negro and neuquén provinces, argentina. | a new species of haemogamasus mites is described from chubut, neuquén and río negro provinces, argentina. it was collected primarily from rodents of the genus abrothrix (65 of 77 collections): abrothrix longipilis (63), abrothrix olivaceus olivaceus (1) and abrothrix olivaceus xanthorhinus (1). additional collections were made from geoxus valdivianus (5) and loxdomtomys micropus (5). possibly incidental or contaminate collections were recorded from oligoryzomys longicaudatus (1) and dromiciops g ... | 2012 | 22448119 |
| fruit size determines the role of three scatter-hoarding rodents as dispersers or seed predators of a fleshy-fruited atacama desert shrub. | scatter-hoarding rodents can act as both predators and dispersers for many large-seeded plants because they cache seeds for future use, but occasionally forget them in sites with high survival and establishment probabilities. the most important fruit or seed trait influencing rodent foraging behavior is seed size; rodents prefer large seeds because they have higher nutritional content, but this preference can be counterbalanced by the higher costs of handling larger seeds. we designed a cafeteri ... | 2016 | 27861550 |
| description of a new species of ectinorus (e. spiculatus) (siphonaptera, rhopalopsyllidae) from argentina and a review of the subgenus ichyonus smit, 1987. | a new species, ectinorus spiculatus, is described from phyllotis xanthopygus (waterhouse) and akodon iniscatus thomas from neuquén province, argentina. habitat characteristics are presented for the type locality. a change in status of four additional subspecies of the ectinorus subgenus ichyonus smit is provided. ectinorus onychius onychius jordan and rothschild, ectinorus onychius deplexus smit and ectinorus onychius angularis smit & rosický were elevated to specific status. ectinorus (ichyonus ... | 2011 | 21998530 |
| numerical and functional response of predators to a long-term decline in mammalian prey at a semi-arid neotropical site. | occurrence and diet of ten carnivorous predators (four falconiforms, four owls, and two foxes), and population levels of their mammalian prey, were monitored over 45 months at a semi-arid site in north-central chile. early in this period, small mammals irrupted and then declined markedly to a density 7% of that at peak. all four falconiforms (buteo polyosoma, falco sparverius, geranoaetus melanoleucus, parabuteo unicinctus) and one owl (tyto alba) responded numerically to the decline in mammalia ... | 1992 | 28313400 |
| microhabitat selection in two chilean cricetid rodents. | a discriminant analysis on vegetational variables was performed in order to determine differences in habitat utilization by two sympatric chilean rodents. akodon olivaceus brachiotis is associated with vegetational variables that provide greater cover from above. oryzomys longicaudatus philippii, on the other hand, is related with structural variables such as foliage density, which provide dense areas with thick understory that offer protection from a horizontal viewing. a clear relationship was ... | 1982 | 28310102 |
| bioenergetics and food preferences in sympatric southern chilean rodents. | ecological divergences in two congeneric sympatric woodland rodents, akodon olivaceus brachiotis and akodon longipilis apta (family cricetidae) was demonstrated from determination of energetic bud gets and food preferences. it was found that each species posseses a different bioenergetic strategy. the heavier (a. longipilis) species has a larger daily energetic budget as compared to the lighter one (a. olivaceus). this phenomenon can be partially explained by their differential selection of seed ... | 1981 | 28311089 |
| a new species of moniliformis from a sigmodontinae rodent in patagonia (argentina). | the majority of species of acanthocephala known thus far from south america have been recorded mostly in fish and wild birds. in particular, rodents in argentina have been poorly studied for acanthocephalans. the genus abrothrix (sigmodontinae-cricetidae) ranges from the altiplano of southern peru through the highlands of bolivia, northern chile, and argentina south through tierra del fuego. the purpose of this paper was to study acanthocephala species parasitizing different populations of abrot ... | 2017 | 28585077 |
| mountaintops phylogeography: a case study using small mammals from the andes and the coast of central chile. | we evaluated if two sigmodontine rodent taxa (abrothrix olivacea and phyllotis darwini) from the andes and coastal mountaintops of central chile, experienced distributional shifts due to altitudinal movements of habitat and climate change during and after the last glacial maximum (lgm). we tested the hypothesis that during lgm populations of both species experienced altitudinal shifts from the andes to the lowlands and the coastal cordillera, and then range retractions during interglacial toward ... | 2017 | 28672032 |
| characterization of the kidney transcriptome of the south american olive mouse abrothrix olivacea. | the olive mouse abrothrix olivacea is a cricetid rodent of the subfamily sigmodontinae that inhabits a wide range of contrasting environments in southern south america, from aridlands to temperate rainforests. along its distribution, it presents different geographic forms that make the olive mouse a good focal case for the study of geographical variation in response to environmental variation. we chose to characterize the kidney transcriptome because this organ has been shown to be associated wi ... | 2014 | 24909751 |
| fleas associated with non-flying small mammal communities from northern and central chile: with new host and locality records. | fleas associated with small mammals from seven localities from northern and central chile were assessed. we captured 352 small mammals belonging to 12 species from which we obtained 675 fleas belonging to 15 different species. the most frequently captured flea species were neotyphloceras crassispina crassispina (n = 198) and n. chilensis (n = 175). high values of flea species richness and diversity were found in fray jorge national park (np), a north-central chilean site, whereas the highest val ... | 2013 | 23496338 |
| distributional ecology of andes hantavirus: a macroecological approach. | hantavirus pulmonary syndrome (hps) is an infection endemic in chile and argentina, caused by andes hantavirus (andv). the rodent oligoryzomys longicaudatus is suggested as the main reservoir, although several other species of sigmodontinae are known hosts of andv. here, we explore potential andv transmission risk to humans in southern south america, based on eco-epidemiological associations among: six rodent host species, seropositive rodents, and human hps cases. | 2018 | 29929522 |
| a 19 year analysis of small mammals associated with human hantavirus cases in chile. | small mammals present in areas where hantavirus cardiopulmonary syndrome (hcps) cases had occurred in central and southern chile were captured and analyzed to evaluate the abundance of rodents and seroprevalence rates of antibodies to andes orthohantavirus (andv). sampling areas ranged from the coquimbo to aysén regions (30-45° s approx.) regions. ninety-two sites in peridomestic and countryside areas were evaluated in 19 years of sampling. an antibody against andv was detected by strip immunoas ... | 2019 | 31547341 |
| helminthic infection in three native rodent species from a semiarid mediterranean ecosystem. | helminth parasites are still not a well-known component of animal biodiversity. in this study, we describe and compare the endoparasite assemblages of three native rodent species from a semiarid mediterranean ecosystem. a total of eight species of gastrointestinal helminth parasites were detected. the endoparasitic communities of the rodents phyllotis darwini (5 species), octodon degus (4 species), and abrothrix olivaceus (3 species) were described in terms of their prevalence and mean abundance ... | 2019 | 30916258 |
| trypanosoma cruzi-infected triatomines and rodents co-occur in a coastal island of northern chile. | trypanosoma cruzi, the cause agent of chagas disease, is transmitted mainly by blood-feeding insects of the subfamily triatominae. the t. cruzi life cycle alternates between triatomines and mammalian hosts, excluding birds and reptiles. triatomines of mepraia genus are wild vectors of t. cruzi in chile. mepraia specimens infected with t. cruzi have been detected in pan de azúcar and santa maría islands. the most common vertebrates that inhabit these islands are birds and reptiles, and it is unkn ... | 2020 | 33088613 |
| identification of trombiculid mites (acari: trombiculidae) on rodents from chiloé island and molecular evidence of infection with orientia species. | scrub typhus is an emerging vector-borne zoonosis, caused by orientia spp. and transmitted by larvae of trombiculid mites, called chiggers. it mainly occurs within a region of the asia-pacific called the tsutsugamushi triangle, where rodents are known as the most relevant hosts for the trombiculid vector. however, the reservoir(s) and vector(s) of the scrub typhus outside asia-pacific are unknown. the disease has recently been discovered on and is considered endemic for chiloé island in southern ... | 2020 | 31971956 |
| genetic variability and structure of the olive field mouse: a sigmodontine rodent in a biodiversity hotspot of southern chile. | the temperate rainforests of southern chile, a recognized biodiversity hotspot, were significantly affected by pleistocene glacial cycles in their southern portion and have been severely disrupted mainly due to recent human activities. additionally, the landscape is characterized by a series of potential barriers to gene flow, such as the chacao channel, cordillera de piuche in chiloé and both the ancud and the corcovado gulfs. we used mitochondrial dna sequences and microsatellite data across s ... | 2019 | 31149405 |
| an association between differential expression and genetic divergence in the patagonian olive mouse (abrothrix olivacea). | recent molecular studies have found striking differences between desert-adapted species and model mammals regarding water conservation. in particular, aquaporin 4, a classical gene involved in water regulation of model species, is absent or not expressed in the kidneys of desert-adapted species. to further understand the molecular response to water availability, we studied the patagonian olive mouse abrothrix olivacea, a species with an unusually broad ecological tolerance that exhibits a great ... | 2018 | 29940092 |