Browsing by Autor "Maira T. Martinez-Ugarteche"

Now showing 1 - 5 of 5

Astronium woodii (Anacardiaceae), a new species from Bolivia
(Springer Science+Business Media, 2021) Daniel Villarroel; Maira T. Martinez-Ugarteche; Germaine Alexander Parada; Bente Klitgaard
Efecto de la pérdida de cobertura natural sobre la flora endémica del Área Tropical Importante para Plantas (TIPA) Concepción (Santa Cruz, Bolivia)
(Universidade Federal de Goiás, 2022) Scarlet Jazmin Quiroga-Méndez; Oriana Anyhely Lino-Villalba; Liliana Arroyo-Herbas; Marisol Toledo; Maira T. Martinez-Ugarteche; Jean Carla Montero Aramayo; Bente Klitgaard; Daniel Villarroel Segarra
En el presente estudio se inventarió la riqueza de taxones endémicos que habitan en el Área Tropical Importante para Plantas (TIPA) Concepción, así como el efecto de la pérdida de la cobertura natural sobre estos atributos florísticos. El inventario fue realizado mediante fuentes de datos primarios (prospecciones de campo) y secundarios (bases de datos y especímenes de herbarios). La pérdida de la cobertura vegetal fue determinada mediante el análisis multitemporal de imágenes satelitales de tres periodos de tiempo (1990-2000, 2001-2010, 2011-2020). Basados en los registros históricos e inventarios de campo, un total de 28 taxones endémicos fueron inventariados (dos son nuevas especies para la ciencia). El endemismo que resguardan los hábitats que conforman el paisaje del área de estudio resultó distinto cuando comparados unos con otros (<30% de similaridad). Hasta el 2020, la cobertura natural se redujo progresivamente al 72.6%, bajo una tasa de pérdida anual de 0,88% ± 0,27%. Como consecuencia de la pérdida de la cobertura vegetal, ocho de los 28 taxones endémicos han desaparecido en la TIPA Concepción, ya que los hábitats donde fueron registrados se sustituyeron por áreas de producción agropecuaria. Por lo cual, los taxones remanentes enfrentan un alto riesgo de extinción local.
Handroanthus abayoy, a new species of Bignoniaceae endemic from Bolivia
(2026) Daniel Villarroel; G. Alexander Parada; Maira T. Martinez-Ugarteche; Bente B. Klitgaard
Handroanthus abayoy, a new species of Bignoniaceae endemic from Bolivia
(Q15088586, 2022) Daniel Villarroel; Germaine Alexander Parada; Maira T. Martinez-Ugarteche; Bente Klitgaard
Handroanthus abayoy is a new species endemic to the southern region of the department of Santa Cruz, Bolivia. Morphologically the most similar species to H. abayoy is H. selachidentatus, both species are part of Tabebuia group II according to the classification proposed by Grose & Olmstead (2007). However, the two species have a different geographic distribution, and at least 15 morphological characteristics, both vegetative and reproductive, that distinguish one from the other.
Plant biogeography of rock outcrops in South American tropical lowlands
(International Biogeography Society, 2025) Rosie Clegg; Luísa Azevedo; Maira T. Martinez-Ugarteche; Danilo M. Neves; Catherine Kidner; D. J. N. Hind; Alexandre Antonelli; Lucy Rowland; R. Toby Pennington
Studies of rock outcrops in tropical South America have increased in recent years, but they have often been restricted to individual countries, single biomes or single disciplines (e.g. through a floristic, functional or genetic lens), limiting their generality. We review the current state of knowledge on the geological and floristic diversity of rock outcrops in tropical South America to identify knowledge gaps and generate testable hypotheses for future research into the biogeography and evolution of their plant communities. We find that the diversity of lowland rock outcrop vegetation is disparately documented and we know less about the evolutionary and biogeographic history of these island-like systems. Based on geological and edaphic factors, we classify South American rock outcrops into four main groups: granite/gneiss, quartzite/metamorphosed sandstone, limestone and ironstone. We hypothesise that these lithologies influence the floristic and evolutionary lineage composition of outcrop floras. However, elevation also plays a role through creating microclimatic conditions and by influencing the degree of insularity from the surrounding vegetation. Our literature review suggests that these lithologies support different floras, but confirming this requires further floristic surveys across the full geological diversity of outcrops. We suggest a research framework to: (i) improve knowledge of outcrop floras and how they relate to floras of surrounding biomes; (ii) investigate the relative roles of niche conservatism and evolution using floristic and phylogenetic approaches; and (iii) assess how outcrop species cope with living in naturally fragmented habitats through analysis of recruitment and gene flow using population genetics. Understanding the biogeography of rock outcrop floras can help provide information for conservation planning and decisions. Rock outcrops are in urgent need of study because they possess a distinctive and highly specialised flora that is threatened by climate and land-use changes. There is a need to increase the number of studies in some Latin American countries (e.g. Bolivia, Paraguay, Guyana, French Guiana and Suriname) and lithologies (e.g. limestone). We suggest that the major determinant of floristic composition on rock outcrops is lithology and outline how this can be tested using community-level floristic data. Inferring the phylogenetic relationships of the species endemic to rock outcrops and establishing the environments where their closest relatives occur will be a powerful approach to address questions of niche evolution and niche conservatism in the historical assembly of outcrop floras. Population genetic approaches focusing on plant species that occur both in outcrop habitats and the surrounding vegetation will elucidate their connectivity and, therefore, how insular and vulnerable these environments are.