Aixa O. RIVERO Guerra

Universidad Estatal Amazónica | UEA · BIODIVERSIDAD Y CONSERVACIÓN

Se valida la hipótesis que el uso tradicional de plantas introducidas y nativas es análogo en Ecuador. Ciento veinticuatro entrevistas se desarrollan en 13 provincias de Ecuador, a 99 mujeres y 25 hombres, 107 del total son mestizos y 17 son indígenas, mayoritariamente comerciantes con estudios primarios y constan de 1 a 60 años de experiencia, que...

Se analiza la cobertura y los principales indicadores bibliométricos de las investigaciones en turismo basado en la naturaleza en las bases de datos de Clarivate Analytics (1900-2020). La mayor producción científica se observa entre 2010 y 2020 en revistas indexadas en la colección principal de Web of Science, las otras bases de datos contribuyen d...

An in situ inventory is made of the native and introduced plant species that are cultivated and marketed in the four Pelileo plant nurseries, and all of their owners are interviewed. The dual hypothesis that the nurseries represent an economic and business option for the integration of women in rural areas and that the use of introduced plant speci...

La familia Asteraceae está representada en la Flora de Ecuador por un total de 310 táxones endémicos. Están agrupadas en 4 subfamilias (Asteroideae, Barnadesioideae, Cichorioideae y Mutisioideae), 16 tribus y 89 géneros. Doscientas setenta y dos táxones (87,74%) restringen su hábitat a la región andina. Los niveles más altos de endemismos están aso...

Three models for the teaching of the General Botany course delivered during the first semester of the Agricultural Engineering career at the Amazonian State University (Ecuador) are evaluated. The learning styles and strategies of the 29 enrolled students are determined, as well as the effect of the pedagogical model on their grades. Three Units ha...

Los productos naturales presentan una alta demanda en los mercados nacionales e internacionales, entre ellos se encuentran la miel. El valor exportado a nivel mundial en concepto de miel natural entre 2012 y 2016 varío entre 1763852-2334422 (en miles de USD), con una tasa crecimiento anual en valor y cantidad de las exportaciones entre el 4% y del...

Specific material was designed to teach and learn how to analyse starch grains in the context of a university General Botany course. The educational experience has been assessed through the Flipped Classroom approach. The study includes 150 participants from the departments of Biology and Pharmaceutical Sciences of the University of Cartagena, Colo...

Specific material was designed to teach and learn how to analyse starch grains in the context of a university General Botany course. The educational experience has been assessed through the Flipped Classroom approach. The study includes 150 participants from the departments of Biology and Pharmaceutical Sciences of the University of Cartagena, Colo...

The present study evaluates Linnaeus' concept of S. rosmarinifolia, as well as its interpretation and application. Additional original material of S. rosmarinifolia L. is cited and discussed. Santolina minor Mill., S. linearifolia Jordan & Fourr., S. chamaecyparissus L. subsp. viridis Rouy var. β subintegrifolia Rouy, S. rosmarinifolia f. robusta S...

The phylogenetic relationships between taxa of the Santolina rosmarinifolia aggregate were studied using TNT and PAUP parsimony analyses of a morphological data matrix that encompasses 2516 individuals. Two major clades can be distinguished: clade 1 comprises S. semidentata, S. melidensis, S. impressa, S. orocarpetana and S.×oblongifolia; clade 2 c...

The lectotype of Santolina oblongifolia Boiss. is examined and discussed. Santolina heterophylla Willk. & Cut., S. oblongifolia Boiss. var. obtusifolia Willk., S. oblongifolia var. ceratophylla Willk., and S. lobata Jord. & Fourr. are lectotypified. Santolina oblongifolia Boiss. f. intermedia Pau is neotypified. The current status of these names is...

Typification et synonymie de Santolina ageratifolia Barnades ex Asso (Asteraceae, Anthemideae), une espèce endémique de la péninsule Ibérique. Les patrons de spéciation dans le genre d'angiospermes Santolina (Asteraceae, Anthemideae) ont été récemment étudiés intensivement, mais la progression des connaissances est entravée par la confusion nomencl...

Morphological variation within and between taxa of the Santolina rosmarinifolia L. aggregate were studied. This work demonstrates that polyploidy and hybridization may be effective evolutionary mechanisms of speciation, promoting the persistence and survival of new species, and ultimately increasing the diversity of plant species. The patterns of m...

During recent studies in the Santolina rosmarinifolia L. aggregate, nomenclatural problems with the the names S. impressa and S. semidentata published by Hoffmannsegg and Link were revealed. Here, both names are neotypified and S. rosmarinifolia var. cinerea Pau & Merino and S. zamorana Losa are lectotypified. The criteria used to recognise S. impr...

Santolina impressa (2n=2x=18) is an endemic species of Portugal, with restricted geographical distribution. The present study aimed to explore its chromosomal variation in respect to chromosome morphology, meiotic behaviour, and effects on pollen stainability and fecundity. Its karyotype formula was found to be either 12m+2msat+2smsat+2st (75% of t...

The chromosome analysis of Santolina rosmarinifolia subsp. rosmarinifolia, S. oblongifolia, S. semidentata subsp. semidentata, S. semidentata subsp. melidensis, S. canescens and the hybrid complex (S. rosmarinifolia subsp. rosmarinifolia, S. oblongifolia and their putative hybrids) shows that all the taxa are diploids (2n=2x=18; 18+1 or more B chro...

Phenotypic differentiation of two tetraploid (2n = 4x = 36, 36+1B, 36+2B) populations of Santolina rosmarinifolia geographically isolated from diploid populations was investigated. The karyotype was relatively homogeneous, meiosis was regular and pollen was fertile in both cytotypes. An autopolyploid or allopolyploid origin for tetraploid cytotypes...

Santolina ageratifolia Barnades ex Asso is a natural autohexaploid (2n = 6x = 54, 54 + 1B), endemic to Teruel Province, Spain and inhabits a substrate derived from sandstone, red limolite and quartzite. Three chromosome formulae are found: 30m + 12sm + 12st, present in 52% of the descendants (52 metaphase), 24m + 5m-1sm + 18sm + 6st in 39% of the d...

A cytogenetic study of 62 populations of Santolina pectinata in Spain shows the existence of two ploidy levels. The diploid cytotypes with 2n = 18 occupy the eastern Betic mountains, and the tetraploid cytotypes with 2n = 36 are located on the spurs of the Iberian System. The former show a much wider ecological spectrum than the latter. Mixed cytot...