Topic
Eliurus
About: Eliurus is a research topic. Over the lifetime, 18 publications have been published within this topic receiving 229 citations.
Papers
TL;DR: In this article, the role of fragmentation and possible effects of introduced Rattus rattus on endemic rodents (Macrotarsomys bastardi and Eliurus spp.) and the gray mouse lemur (Microcebus murinus) were assessed for dry deciduous forests in Madagascar.
Abstract: Studies on the effects of nonindigenous invasive species and habitat fragmentation on native ecosystems have become priorities for conservation biologists. This is relevant particularly for islands with high degrees of endemism. In the present paper the role of fragmentation and possible effects of introduced Rattus rattus on endemic rodents (Macrotarsomys bastardi and Eliurus spp.) and the gray mouse lemur (Microcebus murinus) were assessed for dry deciduous forests in Madagascar. Capture rates of endemic rodents declined significantly with declining fragment size. Macrotarsomys bastardi was never caught in primary forest fragments < 600 ha or outside the primary forest but captures of M. bastardi were correlated to changes in vegetation structure associated with fragmentation rather than to fragment size per se. Eliurus spp. were also found in small primary-forest fragments and in secondary forests close to primary forests, suggesting that secondary forests can serve as buffer zones or corridors for this species. The lemur M. murinus was caught in all types of primary and secondary forest. This species did not seem to respond to fragmentation of primary forests. Even though it was found in most secondary-forests, capture rates declined as these secondary forest formations increased in size. This indicates that secondary forests are suboptimal habitats for M. murinus. Rattus rattus were caught in all vegetation formations except for the open savanna. Their capture rates increased as forest fragments became smaller, indicating that mosaics of different habitat types are beneficial for introduced rats. There was no significant relation between capture rates of R. rattus and the endemic species. In conclusion, these results suggest that (1) native Malagasy rodents of the dry deciduous forest are more sensitive towards forest disturbance than M. murinus; (2) there is no indication for negative interactions between introduced rats and the native small-mammal fauna.
37 citations
TL;DR: Morphology, morphometry, karyotyping, and phylogenetic reconstructions based on nuclear and mitochondrial DNA show that O. utiaritensis, the natural reservoir of hantavirus Castelodos Sonhos in northwest Brazil and previously considered a junior synonym of O. nigripes or O. eliurus, is a validspecies.
Abstract: Species of the genus Oligoryzomys are commonly found accross Latin America, and several of them play important rolesas natural reservoirs of Hantaviruses. Here we demonstrate that O. utiaritensis, the natural reservoir of hantavirus Castelodos Sonhos in northwestwern Brazil and previously considered a junior synonym of O. nigripes or O. eliurus, is a validspecies. Morphology, morphometry, karyotyping, and phylogenetic reconstructions based on nuclear (intron 7 of the beta-fibrinogen gene) and mitochondrial (cytochrome b) DNA show that O. utiaritensis differs from O. nigripes and from otherforms of the genus, including the recently described taxon O. moojeni. Oligoryzomys utiaritensis differs in external (whit-ish ventral pelage and tail weakly bicolored) and cranial (incisive foramina never extending posteriorly the alveolus lineof M1) characters from sympatric species. It has the highest diploid number (2n=72) within Oligoryzomys, and is charac-terized by three putative synapomorphies in cytochrome b, and one in intron 7 of beta fibrinogen. We also point to theassignment of Oligoryzomys eliurus as a junior synonym of O. nigripes. Finally, we present phylogenetic analyses of in-trageneric relationships showing that O. utiaritensis is a member of a clade containing Amazonian and Cerrado taxa, including O. moojeni, O. rupestris, and O. delicatus.
33 citations
TL;DR: Karyotypes of 7 taxa of the rodent genus Oligoryzomys trapped in 33 localities from an area ranging from 01°N to 32°S in Brazil were analyzed and an analysis performed with 11 microsatellite DNA heterologous primers improved differentiation of O. eliurus individuals.
Abstract: Karyotypes of 7 taxa of the rodent genus Oligoryzomys trapped in 33 localities from an area ranging from 018 Nt o 32 8S in Brazil were analyzed. Three species were trapped exclusively in the Cerrado biome: O. stramineus, diploid number (2n) 5 52, fundamental number (herein, number of autosomal arms; FN) 5 68; O. eliurus, 2n 5 62, with 2 fundamental numbers, FN 5 64 and 66; and Oligoryzomys sp., 2n 5 70, FN 5 74. In the Amazon, we caught O. cf. messorius, 2n 5 56, FN 5 58, and O. microtis, 2n 5 66, FN 5 74. Oligoryzomys nigripes (2n 5 61, 62, FN 5 80‐82) was trapped in 24 localities in various biomes, and O. flavescens from several sites in southern Brazil presented the same karyotypes as those already described at other sites. The C- and NOR-banding were performed for all species, and the (T2AG3)n telomeric probe hybridized in situ to both the short and long arms of all pairs of karyotypes of O. cf. messorius, O. eliurus, and Oligoryzomys sp. An analysis performed with 11 microsatellite DNA heterologous primers improved differentiation of O. nigripes from O. eliurus individuals, 2 species that presented 2n 5 62 and that were trapped at the same site.
33 citations
TL;DR: Using mitochondrial markers and a combination of traditional and coalescent‐based phylogeographical, historical demographic and population genetic methods, evidence suggests that historical demographic events occurred within the last 25 000 years BP, which strongly support the proposed late Quaternary shifts in the floristic composition of the Loky‐Manambato region.
Abstract: The Loky-Manambato region, located in northern Madagascar, is a biotically rich contact zone between different forest biomes. Local current forest cover is composed of both humid and dry formations, which show elevational stratification. A recent phylogeographical study of a regional dry forest rodent, Eliurus carletoni (subfamily Nesomyinae), found genetic evidence of forest contractions between 18 750 and 7500 years BP, which based on extrapolation of the pollen subfossil record, was thought to be associated with an expansion of local humid forests. Herein, we conduct a genetic test of this hypothesis and focused on populations on two neighbouring massifs of forest-dependent rodent species, one associated with low-elevation dry forests (E. carletoni) and the other with higher elevation humid forests (Eliurus tanala). Using mitochondrial markers and a combination of traditional and coalescent-based phylogeographical, historical demographic and population genetic methods, we found evidence of historical connections between populations of E. tanala. Adjacent populations of E. carletoni and E. tanala exhibit opposite historical demographic patterns, and for both, evidence suggests that historical demographic events occurred within the last 25 000 years BP. These findings strongly support the proposed late Quaternary shifts in the floristic composition of the Loky-Manambato region.
26 citations
TL;DR: A new species of Eliurus, E. danieli Nesomyinae, is described from the Parc National de l'Isalo in south-central Madagascar; although geographically intermediate to eastern and western forms, diagnostic traits convincingly relate the new species to E. penicillatus.
Abstract: A new species of Eliurus, E. danieli Nesomyidae: Nesomyinae, is described from the Parc National de l'Isalo in south-central Madagascar. Although geographically intermediate to eastern and western forms, diagnostic traits convincingly relate the new species to E. majori and E. penicillatus, forms distributed primarily in eastern humid forest; it is morphometrically most similar to E. penicillatus. In view of the increase in number of Eliurus species 11 now described, discussion is devoted to emerging species associations 5 are identified and to taxonomic and distributional problems introduced by the accumulation of larger series and new localities over the past decade.
24 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 1 |
| 2018 | 2 |
| 2016 | 1 |
| 2013 | 2 |
| 2012 | 1 |
| 2010 | 1 |