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Análisis socioecológico de la extracción de dos especies de palma de Cera (Ceroxylon spp.) en la zona de amortiguación del Parque Natural Chingaza

Santamaría Pineda, Diana Marcela (Facultad de Ciencias Ambientales y de la SostenibilidadCiencias Ambientales, 2016)

Las palmas constituyen el grupo más amenazado a nivel mundial tanto por destrucción de hábitat como por prácticas extractivas. En Colombia, el país más diverso en el género Ceroxylon, la extracción con fines religiosos ...
Bird use of living walls in the city of Bogotá, Colombia

Bolhuis Casas, Esmeralda Isabelle (Facultad de Ciencias Ambientales y de la SostenibilidadCiencias Ambientales, 2016)

Novel trend consisting in the installation of living walls can be evidenced in Bogotá, Colombia, a city characterized by its considerable avian diversity. Living walls have been recognized as a habitat improvement technique ...
Breeding biology of porphyriops melanops bogotensis (Gruiformes, rallidae) an endemic and endangered subspecies from the northern andes

Castro Vargas, Fernando; Rosselli, Loreta (2020)

The Rallidae is a widely distributed family in the planet, with a high proportion of endangered species and limited information on reproductive biology. Porphyriops melanops bogotensis is an endangered and isolated endemic ...
Changes in the avifauna in a high Andean cloud forest in Colombia over a 24‐year period

Rosselli, Loreta; Stiles, F. Gary; Camargo, Pedro A. (2017)

The upper altitude ecosystems of the Andes are among the most threatened by climate change. Computer models suggest that a large percentage of species in these ecosystems will be at risk of extinction and that avian ...
Changes in the avifauna of a relict forest in the Peri-Urban area of Bogota throughout fourteen years

Rosselli, Loreta; De la Zerda, Susana; Candil, Jonathan (2017)

The native vegetation of the Sabana de Bogota’s flat area has been replaced by agricultural lands, pastures and urbanizations over the years. The last relict of this native vegetation is a small forest (ca 10 ha) at Hacienda ...
Checklist of the birds of Colombia: A synthesis of the state of knowledge since hilty and brown

Avendaño, Jorge Enrique; Bohórquez, Clara Isabel; Rosselli, Loreta; Arzuza-Buelvas, Diana; Estela, Felipe A.; Cuervo, Andrés M.; Stiles, F. Gary; Renjifo, Luis Miguel (2017)

The taxonomy and knowledge of the distribution of Colombian avifauna has undergone great changes since the publication of “A Guide to the Birds of Colombia” by Hilty & Brown (1986) to the extent that we are unaware of how ...

Envíos recientes

Análisis socioecológico de la extracción de dos especies de palma de Cera (Ceroxylon spp.) en la zona de amortiguación del Parque Natural Chingaza
...
Santamaría Pineda, Diana Marcela | 2016

Las palmas constituyen el grupo más amenazado a nivel mundial tanto por destrucción de hábitat como por prácticas extractivas. En Colombia, el país más diverso en el género Ceroxylon, la extracción con fines religiosos representa un factor de amenaza que ha contribuido con que cinco de las siete especies del género estén amenazadas. Este trabajo busca describir como fue la práctica extractiva por primera vez en la cordillera oriental y su efecto en las poblaciones de C. quindiuense y C. vogelianum. Mediante parcelas en dos localidades de la zona de amortiguación del PNN Chingaza y diálogos semiestructurados con los actores sociales se encontró que la estructura poblacional de C. vogelianum se vio afectada por la extracción intensiva en el municipio de La Calera con muy pocas plántulas y adultos y el 80% de juveniles. C.quindiuense en el municipio de San Juanito, en donde la extracción no tuvo carácter comercial se encontró una pirámide poblacional con una base ancha indicando que la población está en crecimiento. En La Calera la extracción se hizo por décadas con fines comerciales surtiendo el mercado de Fómeque, Choachí y Bogotá. En San Juanito, un municipio aislado, la extracción se limitó al uso local artesanal y religioso. Con este estudio pionero en la región concluimos que las poblaciones de Ceroxylon están amenazadas por su baja densidad en una zona y por el avance de la frontera agrícola en otra.

LEER
Bird use of living walls in the city of Bogotá, Colombia
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Bolhuis Casas, Esmeralda Isabelle | 2016

Novel trend consisting in the installation of living walls can be evidenced in Bogotá, Colombia, a city characterized by its considerable avian diversity. Living walls have been recognized as a habitat improvement technique that may be valuable in the framework of reconciliation ecology, but very little is known about the habitat provision potential of living walls. Between 2013 and 2014, I studied bird use of living walls in the city of Bogotá. I selected a total of 13 living walls and described them in terms of height, area, and number of plant genera. At each of the sampling sites I performed a spatial analysis using GIS and measured the distance to the nearest park, forest reserve, ecological waterway corridor, and ecological road corridor; I also measured tree cover area within a 100 m radius. I recorded nesting activity in each of the living walls and carried out regular surveys on nine of these. My results indicate that only a few common urban species use living walls, mostly for foraging. A single species, the Rufous-collared Sparrow (Zonotrichia capensis), nested in living walls, discriminating in favor of the taller walls. I found a differential use of living walls, by bird species, in terms of wall zones used and activities performed in the walls. I found that plant composition is an important attribute of living walls as various plant genera provide feeding resources for hummingbirds. I also found a positive relationship between living wall area and sightings of the Great Thrush (Turdus fuscater), as well as a negative relationship between distance to ecological waterway corridors and hummingbird sightings. I conclude that living walls are of value to birds in Bogotá because they provide resources such as food, nesting sites and perching elements, and that living walls can indeed satisfy the conditions of reconciliation ecology. I also make a number of suggestions for generating value-added living walls for urban avifauna.

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Breeding biology of porphyriops melanops bogotensis (Gruiformes, rallidae) an endemic and endangered subspecies from the northern andes
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Castro Vargas, Fernando | 2020

The Rallidae is a widely distributed family in the planet, with a high proportion of endangered species and limited information on reproductive biology. Porphyriops melanops bogotensis is an endangered and isolated endemic Colombian subspecies and no detailed information about its breeding biology and nestling development. We describe the breeding biology of P. m. bogotensis and the development of the nestlings, thus providing novel information that may help its conservation. The study was done in the Bogotá area highland plateau between 2016 and 2019. We surveyed the area weekly in search of nests for description and monitoring. We artificially incubated fourteen eggs; these chicks were raised in captivity until completely developed while measuring growth and taking notes on color changes. The birds nested all year long; clutch size varied between three and six eggs, with an incubation period of 18-20 days. The rails reached their definite size by day 55, with significant differences between sexes. The beak acquired the final color by day 75, while adult eye and plumage color were reached between 150 and 165 days after hatching. In general terms reproductive behavior and development of P. m. bogotensis are like what is known for other members of the Rallidae. The detailed description of coloration change of the subspecies during its development allows precise age determination of individuals in the wild.

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Changes in the avifauna in a high Andean cloud forest in Colombia over a 24‐year period
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Rosselli, Loreta | 2017

The upper altitude ecosystems of the Andes are among the most threatened by climate change. Computer models suggest that a large percentage of species in these ecosystems will be at risk of extinction and that avian communities will suffer disruption and impoverishment. Studies in other Andean countries lend some support to these predictions, but there are no quantitative data from Colombia appropriate to test these models. In 1991–1992, we conducted a bird survey in a high Andean cloud forest to gather information about the species present and their abundance. We attempted to replicate this earlier study 24 yr later to detect any changes in the avifauna and determine possible causes for those changes. From June 2015 to May 2016, we made bimonthly trips to the study site and identified all birds detected either visually or by voice along a number of trails. We supplemented our observational data by also capturing birds in mist-nets. Community species richness and composition as well as the overall abundance of birds changed little from 1991–1992 to 2015–2016, but nearly 30% of bird species changed in abundance. Changes in the presence or abundance of nine or 10 species reflected upward shifts in elevational limits potentially due to climate change. However, most changes in abundance appeared to reflect changes in the vegetation of the study area due to successional changes in forest and subparamo habitats and a large number of relatively recent treefalls of old canopy trees with heavy epiphyte loads and subsequent changes in the understory vegetation. Our results suggest that the effects of climate change on the avifauna in our study area at a high-altitude site in Colombia are apparently occurring more slowly than predicted by recent computer models, although we conclude that the possible effects of climate change should definitely be considered in future studies. However, single-site studies such as ours have limitations in documenting elevation shifts; the most conclusive and quantitative evidence for elevational shifts comes from long-term studies conducted over a wide range of elevations. As such, we recommend establishment of such a monitoring program in Colombia because data obtained from such a program might be important in designing measures to mitigate the effects of climate change and conserve biodiversity. © 2017 Association of Field Ornithologists

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Changes in the avifauna of a relict forest in the Peri-Urban area of Bogota throughout fourteen years
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Rosselli, Loreta | 2017

The native vegetation of the Sabana de Bogota’s flat area has been replaced by agricultural lands, pastures and urbanizations over the years. The last relict of this native vegetation is a small forest (ca 10 ha) at Hacienda Las Mercedes, in the northern border of Bogota. The forest’s small size and isolation from other areas of natural vegetation have resulted in the loss of many species. The problem was exacerbated by uncontrolled growth of invasive vegetation (vines and wild blackberry). However, in recent years restorative action including control of these vegetation has been undertaken and the forest is now immerse in a natural reserve where more restorative actions are being planned. Using point count stations the authors recorded all the birds seen and heard in 2001-2002 and in 2014 in order to evaluate the changes in the bird community and estimate the effects of the restorative actions. We recorded 27 forest species in the first census and 30 in the second. The relative abundance of at least 1/3 of the species also increased indicating a positive result in the forest restoration. The results highlight the capacity of degraded ecosystems to recover and the importance of continuing the restorative actions in the reserve area

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Checklist of the birds of Colombia: A synthesis of the state of knowledge since hilty and brown
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Avendaño, Jorge Enrique | 2017

The taxonomy and knowledge of the distribution of Colombian avifauna has undergone great changes since the publication of “A Guide to the Birds of Colombia” by Hilty & Brown (1986) to the extent that we are unaware of how many and which species inhabit the Colombian territory. Here, we present a checklist of the birds of Colombia updated to August 2017 with a review of 340 references dealing with the distribution of Colombian birds. In sum, we report 1909 species for continental and insular Colombia, 216 of which have been added mainly since 1986. Although there are new data on distribution from 66% of the Colombian avifauna, most publications (87%) and new records (53%) are concentrated to the west of the Eastern cordillera (trans-Andean region). Based on the data we identify those regions of the country with knowledge gaps, which deserve more interest from researchers. Moreover, we encourage the ornithological community to publish their unpublished data and to improve the evidence supporting future new records for the country.

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Browsing by Author "Rosselli, Loreta"

Análisis socioecológico de la extracción de dos especies de palma de Cera (Ceroxylon spp.) en la zona de amortiguación del Parque Natural Chingaza ﻿

Bird use of living walls in the city of Bogotá, Colombia ﻿

Breeding biology of porphyriops melanops bogotensis (Gruiformes, rallidae) an endemic and endangered subspecies from the northern andes ﻿

Changes in the avifauna in a high Andean cloud forest in Colombia over a 24‐year period ﻿

Changes in the avifauna of a relict forest in the Peri-Urban area of Bogota throughout fourteen years ﻿

Checklist of the birds of Colombia: A synthesis of the state of knowledge since hilty and brown ﻿

Envíos recientes

Análisis socioecológico de la extracción de dos especies de palma de Cera (Ceroxylon spp.) en la zona de amortiguación del Parque Natural Chingaza

Bird use of living walls in the city of Bogotá, Colombia

Breeding biology of porphyriops melanops bogotensis (Gruiformes, rallidae) an endemic and endangered subspecies from the northern andes

Changes in the avifauna in a high Andean cloud forest in Colombia over a 24‐year period

Changes in the avifauna of a relict forest in the Peri-Urban area of Bogota throughout fourteen years

Checklist of the birds of Colombia: A synthesis of the state of knowledge since hilty and brown

Análisis socioecológico de la extracción de dos especies de palma de Cera (Ceroxylon spp.) en la zona de amortiguación del Parque Natural Chingaza

Bird use of living walls in the city of Bogotá, Colombia

Breeding biology of porphyriops melanops bogotensis (Gruiformes, rallidae) an endemic and endangered subspecies from the northern andes

Changes in the avifauna in a high Andean cloud forest in Colombia over a 24‐year period

Changes in the avifauna of a relict forest in the Peri-Urban area of Bogota throughout fourteen years

Checklist of the birds of Colombia: A synthesis of the state of knowledge since hilty and brown