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Molecular phylogeny of Larrea and its allies (Zygophyllaceae): reticulate evolution and the probable time of creosote bush arrival to North America.
TLDR
The main conclusions of the present study are that the Argentine endemic Plectrocarpa tetracantha belongs to the subfamily Larreoideae (New World Clade), and all three phylogenies obtained from rbcL, ITS, and combined data sets show a close relationship between the tetraploid L. divaricata and L. tridentata. Expand
Are flightless Galapaganus weevils older than the Galápagos Islands they inhabit?
TLDR
Based on a mtDNA clock calibrated for arthropods, the initial speciation separating the oldest species, G. galapagoensis on the oldest island, San Cristóbal, from the remaining species in the Galápagos occurred about 7.2 Ma, which exceeds geological ages of the extant emerged islands, although it agrees well with molecular dating of endemic GaláPagos iguanas, geckos and lizards. Expand
Diversity of Boll Weevil Populations in South America: A Phylogeographic Approach
TLDR
It is proposed that in South America there are: populations with characteristics of recent invaders, which would be remnants of “bottlenecks” that occurred after single or multiple colonization events, probably from the United States, and ancient populations associated with native forests, partially isolated by events of historical fragmentation. Expand
Molecular evidence for a novel encapsulated genotype of Trichinella from Patagonia, Argentina.
TLDR
A molecular analysis of a new encapsulated isolate of muscle larvae of Trichinella, found in a mountain lion coming from the Patagonia, Argentina, strongly suggest that this isolate represents the twelfth genotype (T12) described in the genus Trichinlla. Expand
Wolbachia infection in the tribe Naupactini (Coleoptera, Curculionidae): association between thelytokous parthenogenesis and infection status
TLDR
Screening of the maternally inherited Wolbachia bacterium in 29 weevils of the tribe Naupactini, using multilocus sequence typing allowed us to assess a significant correlation between asexuality and infection, and suggests an involvement of WolbachIA in the origin of this reproductive mode. Expand
Microsatellite variation in maize landraces from Northwestern Argentina: genetic diversity, population structure and racial affiliations
TLDR
Assessment of racial affiliations using a combined dataset including previous data on American landraces showed a clear relationship between one of these gene pools and typical Andean races, whereas the remaining two gene pools exhibited a closer association to Caribbean accessions and native germplasm from the United States, respectively. Expand
Phylogenetic position of the Oedogoniales within the green algae (Chlorophyta) and the evolution of the absolute orientation of the flagellar apparatus
TLDR
A phylogenetic analysis using 18S ribosomal DNA sequences from 66 species of green algae shows the monophyly of the Oedogoniales within the green algae, and suggests that in this group the flagellar apparatus of the stephanokont zoid could have derived from a DO configuration. Expand
Dispersal of the Cotton Boll Weevil (Coleoptera: Curculionidae) in South America: Evidence of RAPD Analysis
TLDR
The neighbor-joining tree based on Nei's distances and values of Nm (migrants per generation), indicate that genetic similarity between samples from Tecomán (Mexico) and Puerto Iguazú (Argentina), is higher than among remaining South American populations, which supports an hypothesis of natural occurrence of the boll weevil in South America, prior to extensive cotton cultivation. Expand
Parallel adaptive patterns of allozyme and inversion polymorphisms on an ecological gradient
TLDR
An American grasshopper whose South American populations are polymorphic for pericentric inversions constitutes a promising model in which the evolutionary significance of inversion systems can be analysed as possible sources of coadapted groups of linked genes. Expand
Phylogenetic relationships in Dichroplus Stål (Orthoptera: Acrididae: Melanoplinae) inferred from molecular and morphological data: testing karyotype diversification
TLDR
The mapping of chromosome characters on the combined tree shows that the most extreme karyotype, in D. silveiraguidoi, is a derived condition, probably reached through several centic fusions, and that X‐autosome centric fusions were recurrently fixed during the evolution of the group. Expand
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