Browsing by Author "Pillacela Chin, Jenny Priscila"

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Regeneración de árboles en ecosistemas naturales y plantaciones de Pinus patula (Pinaceae) dentro de un gradiente altitudinal andino (Azuay, Ecuador)
(2019) Jadán Maza, Ángel Oswaldo; Cedillo Tapia, Hugo Alberto; Zea Dávila, Pedro René; Bermúdez, Fernando Gerardo; Díaz Granda, Lourdes Elizabeth; Pillacela Chin, Jenny Priscila; Guallpa Tenemaza, Dario Javier; Gordillo Lema, Nely Alexandra; Arciniegas Fárez, Andrés Eduardo; Vaca Vaca, Carlos Miguel; Quizhpe Coronel, Wilson
Andean forests and paramo have high species richness, but constantly they are threatened by deforestation. Natural arboreal regeneration of these ecosystems will condition their structure and functionality in the future, but now it has been poorly evaluated. In the Andes of Southern Ecuador, there are also abandoned Pinus patula (pine) forest plantations, which could be scenarios to promote natural regeneration. In an Andean altitudinal gradient, we evaluated floristically parameters of tree regeneration between two study scenarios: natural ecosystems (herbaceous paramos and natural forests) and pine plantations. For this, the diversity of regeneration was described by species richness, Shannon index and floristic composi-tion. Abundance with the number of individuals; these parameters were compared between two scenarios. We determined also that environmental variables or predictors of: canopy cover, soil, tree structure, horizontal dis-tance and physiographic explained the variation in the parameters of regeneration with greater magnitude. For this, a partition analysis of the variation was carried out. Richness and diversity of species were greater in natural ecosystems, whereas floristic composition was different and its abundance was similar. In natural ecosystems, basal area and tree density explained mainly the variation in wealth, diversity and abundance. Not so in pine plantations where horizontal distance to the native forests was the predictor that mostly explained. The greatest diversity of regeneration in natural ecosystems (forests) is associated with the existence of arboreal, shrub and seed biotypes. It is adding to this, efficiency in dispersion processes at the micro-habitat level. These aspects are limiting in plantations of pine, in which the dispersion or availability of seeds depends on the proximity to natural ecosystems
The use of YouTube videos in the EFL classroom
(Universidad de Cuenca, 2022-08-31) Pillacela Chin, Jenny Priscila; Sangurima Velecela, Jonnathan Paul; Heras Urgilés, Gerardo Esteban
The purpose of this research synthesis is to identify the main effects of YouTube videos on the development and improvement of the listening skill, the vocabulary sub skill, and students’ motivation when learning English as foreign language. For this, eighteen peer-reviewed articles were analyzed considering inclusion and exclusion criteria. The articles had to be published from 2014. Also, they had to be empirical studies developed in English as foreign contexts. The results of this study demonstrated that the use of the YouTube platform as a complementary material presents advantages for English learners. The findings also showed that using YouTube within EFL classrooms motivates students to develop better their in-class activities either individually or in groups because the videos are attractive and draw their attention. In addition, it was found that applying YouTube content in EFL classes increases the students’ vocabulary sub-skill because it is very entertaining and facilitates students to remember better the learned words. Moreover, the outcomes reveled that the learners improve their listening skills when their teachers use this tool since students can observe the expressions and listen to the different accents native speakers produce while they are talking