Primeros registros de presencia de Nothofagus nitida (Nothofagaceae) en Argentina y estimación de su área de distribución potencial

Abstract

Nothofagus nitida is an evergreen tree species considered endemic to the humid forests of Southern Chile. In this study, we inform the finding of N. nitida individuals on the eastern slopes of the Andes in Argentina, expanding its potential geographic distribution range, restricted until now to humid areas west of the Andean range, in Chile. New localities correspond to the south outlet of Menéndez Lake on riverbanks of Río Alerce and Río del Paso Viejo, in Los Alerces National Park, Chubut Province, Argentina. Samples of fresh leaves were collected from five individuals that were considered as putative N. nitida, based on leaf and bark morphology. We performed automated sequencing of the ITS nuclear DNA region, which was previously used to identify different species of subgenus Nothofagus. Four of the obtained DNA sequences corresponded to N. nitida. In addition, we carried out a species distribution model that showed other potential areas of occurrence in Argentina. This finding merits the exploring efforts in other localities at the East of the Andean Range, using as guidance the potential distribution maps in order to determine its current distribution and genetic markers to confirm its presence.

Las especies de Plagiotelum Solier, 1849 (Coleoptera: Carabidae) de los bosques australes americanos

“…Oerst y N. nitida (Phil.) Krasser cuya distribución es similar, aunque en este último caso más restringida (Promis et al 2008;Mathiasen et al 2017). Plagiotelum constituye un elemento de origen gondwánico patagónico o paleantártico, el cual se caracteriza por tener representantes en distintas regiones subantárticas (Roig-Juñent et al 2008).…”

Hybrid identification in Nothofagus subgenus using high resolution melting with ITS and trnL approach

“…In our case, the use of high resolution melting with ITS approach allowed the authentication of Nothofagus species. Manos (1997), Acosta & Premoli (2010) and Mathiasen et al (2017), have reported phylogenetic relation with ITS region in Nohofagaceae species. The molecular identification with ITS approach of the individuals of the Andean and coastal area of the Los Ríos region, shows that both are positioned genetically between N. dombeyi , and N. antarctica and somewhat distant from N. nitida .…”

“…This could be interpreted as the hybridization may have played a fundamental role in favoring the dispersal and recolonization of the species through the flow of interspecific pollen and the permanence of subgenus Nothofagus species in environments such as those of Patagonia that have been recurrently affected by disturbances throughout its natural history (Donoso, 1987). Finally, Mathiasen et al (2017) performed automated sequencing of the ITS nuclear DNA region, for identify different species of subgenus Nothofagus . Four of the obtained DNA sequences corresponded to N. nitida .…”