Books by Christian R. Loaiza S.
Christian R. Loaiza S., 2012
Reseña histórica sobre la vida del Dr. Clodoveo Carrión Mora, destacado naturalista de principios... more Reseña histórica sobre la vida del Dr. Clodoveo Carrión Mora, destacado naturalista de principios del siglo XX, quien dejó muy en alto el nombre del Ecuador y de su provincia, siendo reconocido por su trabajo como el primer científico naturalista del Ecuador.
Papers by Christian R. Loaiza S.
We report the first record of the Sechuran fox Lycalopex sechurae (Carnivora, Canidae) in an area... more We report the first record of the Sechuran fox Lycalopex sechurae (Carnivora, Canidae) in an area of disturbed montane forest in the Espíndola canton, located in southeastern Loja Province, Ecuador. This report constitutes the first record of the species in this area.
Eptesicus innoxius (Gervais, 1841) is a vespertilionid bat commonly known as harmless brown bat o... more Eptesicus innoxius (Gervais, 1841) is a vespertilionid bat commonly known as harmless brown bat or harmless serotine. It is a small bat, with woolly, short dorsal fur (5-6 mm), that is brown to pale grayish brown; the sagittal and lambdoidal crests are very low or absent. Eptesicus innoxius occurs in lowlands west of the Andes, with a geographic distribution restricted to northwestern and southern Ecuador, and northwestern Peru, at elevations from sea level to 1,200 m. It is listed as "Near Threatened" (NT) by the International Union for Conservation of Nature because of a suspected population reduction due to a significant decline of habitat where the species occurs.
Se presenta una lista actualizada de las cactáceas nativas del Ecuador Continental, incluyendo po... more Se presenta una lista actualizada de las cactáceas nativas del Ecuador Continental, incluyendo por primera vez nombres comunes para todas las especies reportadas, mapas de distribución a nivel nacional y el estado de conservación vigente en base a la última evaluación realizada por la UICN. Se reportan 41 especies nativas, en dos subfamilias, siete tribus y 16 géneros. Seis especies y ocho subespecies son reconocidas como endémicas para el país. La mayor diversidad de especies se concentra en la región sur entre las provincias de Azuay, Loja y El Oro, con el 58.5% del total de las especies reportadas. Se comentan los cambios taxonómicos de algunas especies ocurridos en los últimos años y finalmente, se analiza la situación de cinco especies introducidas. La información presentada representa una alta diversidad en relación a la extensión territorial del Ecuador Continental.
Los cactus globulares son el grupo de cactáceas en mayor riesgo de extinción en el Ecuador Contin... more Los cactus globulares son el grupo de cactáceas en mayor riesgo de extinción en el Ecuador Continental. Melocactus bellavistensis, se encuentra distribuido en un valle seco interandino en la provincia de Loja y actualmente se encuentra listado en la categoría de Datos Insuficientes (DD) por la UICN. La otra especie, M. peruvianus se conoce solo en dos localidades confirmadas en Huaquillas (El Oro), cerca de la frontera con Perú y está considerada como extinta en el Ecuador. Se reporta un nuevo registro de M. peruvianus en un pequeño remanente de Espinar Litoral dentro de la Reserva Ecológica Arenillas. Se analiza la distribución y probabilidad de ocurrencia para ambas especies, y se estima el área de distribución que ocupan mediante el método del polígono mínimo convexo (PMC). Se recomienda una nueva evaluación del estado de conservación y se proponen dos nuevos tipos de categorías para ambas especies en Ecuador. Finalmente, se presentan varias alternativas para su conservación.
We report the first record of Eptesicus innoxius in northwestern Ecuador, in the province of Esme... more We report the first record of Eptesicus innoxius in northwestern Ecuador, in the province of Esmeraldas, occurring in a disturbed area, at 134.3 km northwest from the nearest known locality in Ecuador, which represents an important latitudinal extension in the distribution of this species. A predictive distribution model is presented using a total of 43 records from localities of Ecuador and Peru, and its distribution area is determined by a minimum convex polygon (PMC). Based on new records and known records, we estimate its distribution area in 135,243 km 2. The environmental variables with the greatest influence in the distribution of E. innoxius were: Precipitation seasonality (37.4 %), Minimum temperature of coldest month (20.1 %), Precipitation of driest month (14.5 %), and Mean temperature of wettest quarter (12.8 %). This data show that E. innoxius has been recorded mainly in tropical dry forest, but also has presence in humid areas. Within these new reports, we recommended an upgrade of its conservation status in Ecuador and Peru. Se presenta el primer registro de E. innoxius al noroccidente de la costa ecuatoriana, en la provincia de Esmeraldas, dentro de una zona alterada, a 134.3 km noroeste del registro conocido más cercano en Ecuador, el cual representa una importante extensión en la distribución latitudinal conocida para esta especie. Se realizó un modelamiento predictivo de su distribución, utilizando un total de 43 registros de locali-dades presentes en Ecuador y Perú, y se determinó su área de distribución mediante el método del polígono mínimo convexo (PMC). El área de distribución obtenida en base a los registros utilizados fue de 135,243 km 2. Las variables ambientales con mayor influencia en la distribución de E. innoxius fueron: estacionalidad de la precipitación (37.4 %), temperatura minima del mes más frío (20.1 %), precipitación del mes más seco (14.5 %), y temperatura media del cuatrimestre más lluvioso (12.8 %). De acuerdo con los registros, esta especie habita preferentemente en zonas de bosque seco, pero puede llegar a habitar en zonas de transición con mayor humedad. Basándonos en los nuevos registros obtenidos, se recomienda realizar una nueva evaluación de su estado de conservación en Ecuador y Perú.
Dennisse Ruelas, Víctor Pacheco, Nadia Espinosa y Christian R. Loaiza S., 2018
Purús is a Peruvian Amazonian province with little information on its biodiversity, especially on... more Purús is a Peruvian Amazonian province with little information on its biodiversity, especially on small mammals. This work aims to document the bats diversity in the region by developing intensive inventories at the Río La Novia Conservation Concession, located on the right bank of the La Novia River, Purús, Ucayali Department. We surveyed the study area in the wet and dry seasons of 2015 using mistnets set on the ground and canopy, achieving a total sampling effort of 725 NN (12-m mist nets/night). As result, we recorded 32 bat species that include four new records for Purus province, and two new records for the Ucayali department (Eumops cf. delticus and Molossops temminckii). The seasonal accumulation curves were adjusted to the Clench model; however, the asymptotes were not reached, suggesting that more fieldwork is needed. Non-surprisingly, Phyllostomidae was the most diverse family (24 species). Also, we found that Carollia perspicillata and Artibeus planirostris have the higher relative abundance and that the frugivorous bats were the most abundant trophic guild. Our results suggest that the abundance and composition of bats in the Río La Novia are probably related to seasonal changes, as seen in other primary forests. Considering that Purús maintains one of the few pristine forests in western Amazonia, we suggest that more surveys are needed for a better understanding of bat´s diversity and bat assemblage patterns in tropical forests.
We report the first record of the Choco broad-nosed bat (Plathyrrhinus chocoensis Alberico & Vela... more We report the first record of the Choco broad-nosed bat (Plathyrrhinus chocoensis Alberico & Velazco, 1991) in Santo Domingo de los Tsáchilas province in northwestern Ecuador. This voucher specimen represents the southernmost record of the species and expands its distribution ca. 120 km south. The animal was caught at a farm, specifically in a live fence consisting of several tree species. Preservation of bat species occurring in agricultural landscapes requires local policies and environmental education.
Revista Peruana de Biología, Jul 20, 2017
Tomopeas ravus, el murciélago de orejas romas, se conoce solo de 13 localidades confirmadas en Pe... more Tomopeas ravus, el murciélago de orejas romas, se conoce solo de 13 localidades confirmadas en Perú y actualmente se encuentra listada como En Peligro (B2 ab (ii, iii)) por la UICN. La distribución, extensión de ocurrencia y el área de vida de esta especie no han sido esclarecidos completamente. Presentamos el primer modelo predictivo basado en los registros conocidos y el primer acercamiento geográfico para la especie. Basados en los 13 registros confirmados se construyó un modelo de hábitat de máxima entropía determinando previamente las variables ambientales de mayor importancia para el modelo. Se estimó un índice predictivo aceptable (0.970) para el modelo final. Se determinó las zonas de mayor probabilidad de ocurrencia para esta especie y se estimó el área de distribución mediante el método del polígono mínimo convexo (PMC). El área prioritaria más importante identificada para la conservación de esta especie se sitúa al norte de Perú, entre los Departamentos de Tumbes y Piura. Se recomienda utilizar el presente modelo como herramienta útil para futuras evaluaciones de la conservación de esta especie.
Ecología Aplicada, 2017
Espostoa frutescens, known as Ecuadorian southern woolly cactus, is known only from nine confirme... more Espostoa frutescens, known as Ecuadorian southern woolly cactus, is known only from nine confirmed localities in the south of Ecuador and is currently listed as near threatened (NT) by the IUCN. We analyze the distribution, occurrence extension and home range of this species, and evaluate its current conservation status. Based on the nine known records and the first geographic approach to this species, a habitat / niche model is presented, which was built by previously determining the most important environmental variables for the model. An acceptable predictive index (0.971) was obtained for the final model. The areas of major probability of occurrence for this species were determined and the home range was estimated by the use of the polygon minimum convex method (PMC). The most important priority area identified for the conservation of this species is located in the south of Ecuador, between the provinces of Azuay and Loja. We recommend the use of the present model as a useful tool for future evaluations of conservation of this species.
Nature Plants, 2015
A high proportion of plant species is predicted to be threatened with extinction in the near futu... more A high proportion of plant species is predicted to be threatened with extinction in the near future. However, the threat status of only a small number has been evaluated compared with key animal groups, rendering the magnitude and nature of the risks plants face unclear. Here we report the results of a global species assessment for the largest plant taxon evaluated to date under the International Union for Conservation of Nature (IUCN) Red List Categories and Criteria, the iconic Cactaceae (cacti). We show that cacti are among the most threatened taxonomic groups assessed to date, with 31% of the 1,478 evaluated species threatened, demonstrating the high anthropogenic pressures on biodiversity in arid lands. The distribution of threatened species and the predominant threatening processes and drivers are different to those described for other taxa. The most significant threat processes comprise land conversion to agriculture and aquaculture, collection as biological resources, and residential and commercial development. The dominant drivers of extinction risk are the unscrupulous collection of live plants and seeds for horticultural trade and private ornamental collections, smallholder livestock ranching and smallholder annual agriculture. Our findings demonstrate that global species assessments are readily achievable for major groups of plants with relatively moderate resources, and highlight different conservation priorities and actions to those derived from species assessments of key animal groups.
The Field Museum, Chicago, USA, 2012
Christian R. Loaiza S. y José Roque Gamarra, 2016
We report the first confirmed record for northern Peru of Armatocereus brevispinus Madsen, a spec... more We report the first confirmed record for northern Peru of Armatocereus brevispinus Madsen, a species of cactus regarded as endemic to the province of Loja, in the southern region of Ecuador. The record corresponds to a locality placed near the km 18 of the route to Ayabaca, in the district of Ayabaca, within the province of Ayabaca, in the Department of Piura. This records represents an extension of the distributional range known for this species in Ecuador. We analyze its taxonomy and the distribution and conservation status and comments on its biogeography in the Andean region.
Boletín de la Asociación Biogeográfica Evolutiva y Sistemática, 2013
El centro de endemismo tumbesino: Biogeografía, diversidad y conservación.
Boletín de la Sociedad Latinoamericana de Cactáceas y Suculentas, 2013
Lista actualizada de las cactáceas de las Islas Galápagos.
Christian R. Loaiza S., 2013
Distribución y estado de conservación de Armatocereus laetus.
Christian R. Loaiza S., 2013
Distribución y estado de conservación de Armatocereus cartwrightianus.
Christian R. Loaiza S., 2012
Distribución y estado de conservación de Espostoa frutescens.
Christian R. Loaiza S., 2012
Distribución y estado de conservación de Armatocereus brevispinus.
Christian R. Loaiza S., 2012
Distribución y estado de conservación de Melocactus bellavistensis subsp. bellavistensis.
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Books by Christian R. Loaiza S.
Papers by Christian R. Loaiza S.