Romina Vidal-Russell

National University of Comahue | UNCo · Botanica

Background and aims: Development of management measures of invasive non-native species is priority in protected areas, particularly when actions are taken at early stages of invasion since it facilitates the recovery of natural systems. Here, we present a methodology to control an invasive evergreen vine, Hedera helix (Araliaceae). M&M: The proposa...

Introducción y objetivos: Las prácticas de manejo de especies no-nativas e invasoras es tema prioritario en áreas protegidas, en especial en estadios tempranos de invasión, porque facilita la recuperación de sistemas nativos. Aquí presentamos una metodología para el control de una planta trepadora invasora, Hedera helix (Araliaceae). M&M: Se realiz...

Introducción y objetivos: Los inventarios en áreas protegidas son indispensables para planificar acciones de conservación. Se propone: proveer una base de datos de las especies de plantas vasculares de los Parques Nacionales del noroeste de Patagonia, Argentina, destacar la singularidad de los Parques y analizar la incidencia de las especies exótic...

Nitella sonderi A.Braun is newly reported from the Patagonian Plateau, Argentina. This species was only reliably known from Australia until now. The morphological and genetic studies carried out here found no difference between Argentinian and Australian specimens. The species is dioecious, mucous-bearing on fertile whorls, with two to three-forked...

Gaiadendron punctatum (Ruiz & Pav.) G. Don. exhibits a wide morphological variation and geographical distribution, ranging from Nicaragua to Bolivia. Reported polymorphism and the existence of more than 20 synonyms for Gaiadendron punctatum might indicate that there is either a cryptic complex, or that this species shows great variation. Population...

Relationships between genome size and environmental variables suggest that DNA content might be adaptive and of evolutionary importance in plants. The genus Larrea provides an interesting system to test this hypothesis, since it shows both intra- and interspecific variation in genome size. Larrea has an amphitropical distribution in North and South...

The complexity of natural communities is the result of interactions among species that coexist within them. Parasitic interactions are among the most common species interaction types, and analysis of parasite‐host ranges can advance understanding of how host‐parasite pairs structure community interactions across their geographic distributions. Usin...

Drosera L. (Droseraceae) is a genus of insectivorous plants distributed worldwide with 240 species, 40 of which are found in South America. In the temperate forests of Chile and Argentina the only species present is D. uniflora. In a peat bog in Nahuel Huapi National Park, Argentina, a new species of Drosera was found in February 2018. To identify...

p> Introducción y objetivos: Ligaria cuneifolia (Loranthaceae) posee una amplia distribución desde Perú al centro de Argentina y Uruguay. Esta especie habita en tres regiones geográficas en forma disyunta a lo largo de cordillera de los Andes, las Sierras Centrales de Argentina y en el este de Sudamérica, en Uruguay y sur de Brasil. El objetivo de...

The number of host species infected by a mistletoe (host range) is critical in that it influences prevalence, virulence and overall distribution of the parasite; however, macroecological analyses of this life history feature are lacking for many regions. The Andean‐Patagonian forest, found along the southern Andes from 35˚S to Tierra del Fuego 55˚S...

Dos nuevos registros de la familia Lobariaceae (Ascomycota liquenizados: Peltigerales) para la Argentina. Como parte de estudios a largo plazo enfocados en la diversidad de hongos liquenizados del sur de Argentina, se registran por primera vez para el país dos especies de la familia Lobariaceae (Peltigerales), Pseudocyphellaria pluvialis y Sticta l...

The integration of different characters (e.g. morphological, ecological, and molecular) is now recognized as important in species delimitation. In particular, genetic distances between homologous genes have been suggested as one of the main tools to identify species, especially in the case of cryptic species. Quinchamalium is morphologically variab...

Lichen symbioses are defined as a symbiotic relationship between a mycobiont (generally an ascomycete) and one or more photobionts (green algae or/and cyanobacteria). It was proposed that cephalodia emancipation is an evolutionary driver for photobiont switch from chlorophyte to cyanobacteria. In this study we want to test the monophyly of cyanolic...

The foliose lichens Pseudocyphellaria pilosella and P. piloselloides are characterized by a cyanobacterial photobiont, a tomentose upper surface, a yellow medulla and yellow pseudocyphellae. The latter species has long been recognized as the sorediate counterpart of the former. The morphological, anatomical, chemical, and molecular analyses perform...

Quinchamalium (Schoepfiaceae) is a root hemiparasite with a broad geographic range throughout the Andes. Regional studies have used various vegetative and floral traits to describe and identify species, but there has been no detailed analysis of the continuum of morphological variation across the entire geographic range of this genus. Currently 21...

Conservation planning requires setting priorities at the same spatial scale at which decision-making processes are undertaken considering all levels of biodiversity, but current methods for identifying biodiversity hotspots ignore its genetic component. We developed a fine-scale approach based on the definition of genetic hotspots, which have high...

The genus Quinchamalium comprises hemiparasitic herbs endemic to South America. Its distribution expands through the Andes from northern Peru to southern Patagonia. The vague morphological limits and the existence of scarce diagnostic characters for the correct identification of the currently accepted species, implies the need for a revision of the...

El género Quinchamalium comprende hierbas hemiparásitas y es endémico de Sudamérica. Su distribución abarca los Andes desde el norte del Perú hasta el sur de la Patagonia. Los límites morfológicos pocos claros y la escasez de caracteres diagnósticos para la correcta identificación de las especies actualmente aceptadas revelan la necesidad de una re...

Nothofagus trees host Misodendrum, an endemic mistletoe of the subantarctic forests of Chile and Argentina. Differences in the infection intensity on a given host and patches of infected trees are observed within the forest. We used allozymes to test for genetic differences between uninfected and infected Nothofagus trees (Nothofagus antarctica (G....

The genetic structure of a plant species is influenced by life-history traits, geographical range and ecological interactions that shape gene flow. We examined the genetic structure of the South American mistletoe Tristerix corymbosus using random amplification of polymorphic DNA. This species is found mainly in Chile and inhabits two biomes, the C...

Chaenothecopsis quintralis from southwestern Argentina is described and illustrated as a new species in the family Mycocaliciaceae. It has been found in three localities in the Andean Patagonian temperate forests, growing strictly on dung of an endemic marsupial Dromiciops gliroides. The new species is distinguished by the hemispherical, black capi...

Abstract—Tripodanthus consists of three species that are endemic to South America. While T. acutifolius and T. flagellaris have east-west distributions in tropical and subtropical South America, T. belmirensis is restricted to its type locality in the region of Belmira, Colombia. The objective of the present study was to reconstruct the phylogeny o...

Embothrium coccineum J.R.Forst. & G.Forst is an endemic tree of the Patagonian temperate forest. The objective of this study is to evaluate the impact of last glaciation events on the genetic structure of this widespread and ecologically tolerant species, to postulate possible refugial areas. Phylogeographic analyses were performed using chloroplas...

We present here a revised classification of Santalales, an angiosperm order that contains 18 families, 160 genera, and over 2200 species. Both nonparasitic and parasitic flowering plants occur in the traditionally circumscribed family Olacaceae whereas all other families are composed entirely of parasites. The five evolutionary radiations of aerial...

We present here a revised classification of Santalales, an angiosperm order that contains 18 families, 160 genera, and over 2200 species. Both nonparasitic and parasitic flowering plants occur in the traditionally circumscribed family Olacaceae whereas all other families are composed entirely of parasites. The five evolutionary radiations of aerial...

Loranthaceae (73 genera and ca. 900 species) comprise mostly aerial hemiparasitic plants. Three monotypic genera considered relicts are root parasites. The family is diverse in tropical areas, but representatives are also found in temperate habitats. Previous classifications were based on floral and inflorescence morphology, karyological informatio...

Past molecular phylogenetic work has shown that aerial parasites have evolved five times independently in the sandalwood order (Santalales), but the absolute timing of these diversifications was not addressed. DNA sequences from nuclear SSU and LSU rDNA, and chloroplast rbcL, matK and trnL-F from 39 santalalean taxa were obtained. Separate and comb...

Misodendrum comprises eight species of aerial hemiparasites endemic to temperate forests of Chile and Argentina that parasitize Nothofagus. This mistletoe is unique in that it has feathery staminodes on its wind dispersed achenes. Previous classifications included two subgenera, Misodendrum (two sections) and Angelopogon (three sections). The prese...

Phylogenies can provide valuable information on biotic and abiotic factors associated with speciation. We examined species relationships in Tristerix (Loranthaceae), a genus of 11 species with an Andean distribution from Colombia to Chile. A previous classification divided Tristerix into subgenera Tristerix (two species) and Metastachys (nine speci...

Phylogenies can provide valuable information on biotic and abiotic factors associated with speciation. We examined species relationships in Tristerix (Loranthaceae), a genus of 11 species with an Andean distribution from Colombia to Chile. A previous classification divided Tristerix into subgenera Tristerix (two species) and Metastachys (nine speci...

The evolutionary history of populations and species play a major role in determing the levels and distribution patterns of genetic variants. Particularly range contractions during Pleistoce glaciations (c. 18,000 yr. Bp) followed by recolonization after glacial retreat are thought to affect genetic patterns. Hotspots of genetic diversity and among-...

En este trabajo se estudió la hibridación entre Nothofagus pumilio y N. antarctica mediante análisis de morfología foliar y de electroforesis isoenzimática en la población de altura de Laguna Negra en el noroeste de la Patagonia, Argentina. Muestras colectadas en esta población para análisis morfológicos y genéticos fueron comparadas con poblacione...

The phylogenetic relationships among the holoparasites of Rafflesiales have remained enigmatic for over a century. Recent molecular phylogenetic studies using the mitochondrial matR gene placed Rafflesia, Rhizanthes and Sapria (Rafflesiaceae s. str.) in the angiosperm order Malpighiales and Mitrastema (Mitrastemonaceae) in Ericales. These phylogene...

Strict consensus MP tree from mitochondrial atp1 Strict consensus of 328 trees resulting from a MP analysis of the 71-taxon mitochondrial atp1 matrix. Rafflesiales taxa are shown in bold italics. Bootstrap percentages are given above the branches.

Majority rule consensus BI tree from 3-gene data set Majority rule consensus of 20,000 trees (10 million generations, 5 million burn-in) resulting from Bayesian analysis of the 77-taxon nuclear 3-gene matrix. Clades with Bayesian posterior probabilities are indicated above the clades. Rafflesiales taxa are shown in bold italics.

MP strict consensus tree from mitochondrial matR Strict consensus of 200,000+ trees obtained from maximum parsimony (unconstrained MP) analysis of the 77-taxon mitochondrial matR matrix. Bootstrap percentages are shown above the lines. Rafflesiales taxa are shown in bold italics.

Strict consensus constrained MP tree from nuclear SSU rDNA Strict consensus of 6 trees resulting from the constrained MP analysis of the 77-taxon nuclear SSU rDNA matrix. Rafflesiales taxa are shown in bold italics. Bootstrap percentages are given above selected nodes (Rafflesiales).

Taxa used in this study MS Excel file giving taxon names and GenBank numbers for all genes used.

RESUMEN.— Presentamos nuevos datos acerca de la distribución del Aguilucho Andino (Buteo albigula) en el noroeste de la Patagonia y de la densidad de parejas reproductivas en las cercanías de la ciudad de San Carlos de Bariloche, Río Negro. Reportamos 15 registros nuevos con fechas de avistaje para la región. Encontramos cuatro territorios reproduc...