Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
Buscar alternativas:
forest after » forest cover (Expander búsqueda), firms after (Expander búsqueda), forest andes (Expander búsqueda)
forest de » forestal de (Expander búsqueda), forest _ (Expander búsqueda), forest rf (Expander búsqueda)
forest after » forest cover (Expander búsqueda), firms after (Expander búsqueda), forest andes (Expander búsqueda)
forest de » forestal de (Expander búsqueda), forest _ (Expander búsqueda), forest rf (Expander búsqueda)
1
tesis de maestría
Publicado 2020
Enlace
Enlace
Gold extraction via small scale mining in the Amazon rainforest of Peru has become one of the greatest threats to deforestation and land degradation in the Amazon, especially in the Madre de Dios region which is one of the last biggest remnants of continuous tropical rainforest in the world. Restoration of these degraded ecosystems have become a priority in the last decade but without concrete actions, however, few research has been conducted in response to these restoration activities nor natural regeneration. The significance of this research was to 1) To Analyze how gold mining affects forest structure, species richness and diversity in the Amazon Rainforest of Madre de Dios, Peru. 2) To assess variation on diversity levels in secondary successional forest compared to that found in primary forest 3) to identify variations in the gold extraction methods reported in the region and how i...
2
artículo
Publicado 2021
Enlace
Enlace
Context: Gold mining is the most destructive activity in the natural forests of the Madre de Dios region in the southeastern Peruvian Amazon. Understanding the natural regeneration process of these degraded areas is necessary to develop forest restoration projects in such conditions. Aims: We aimed to evaluate forest recovery and identify the successional and structure patterns of vegetation governing natural regeneration over time. Methods: Structure, composition, richness, diversity, and successional status were evaluated in abandoned artisanal gold mine areas in Madre de Dios, southeastern Peru. Vegetation data were recorded in 61 plots of 250 m2 established in five sites varying from 1 to 19 years of abandonment. Vegetation in abandoned areas was compared with six undisturbed forests evaluated in previous inventories. Results: In the mining lands, tree density and basal area recovere...
3
artículo
Publicado 2021
Enlace
Enlace
We gratefully acknowledge Laura Cutire, Laura Ramirez, Javier F. Valles, and Erika Sajami for the field work. We also thank the staff of Alwyn Gentry Herbarium of Universidad Nacional Amaz?nica de Madre de Dios and of San Marcos Herbarium of Universidad Nacional Mayor de San Marcos for their technical support in the taxonomic identification. We also thank FONDECYT-CONCYTEC (Fondo Nacional de Desarrollo Cient?fico, Tecnol?gico y de Innovaci?n Tecnol?gica, Per?, award #239-2018) for the fellowship grant to RC-L; CAPES (Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior do Governo do Brasil, Finance Code 001 and #88882.305844/2018-01), FAPESP (Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo, grant #2012/24118-8), and The Royal Society for the fellowship granted to DR; and also FAPESP (grant #2018/22914-8) for the fellowship grant to DOR. Funding. Funding for the field work was...
4
artículo
Publicado 2022
Enlace
Enlace
Peter Joseph Hocking Weeks, or Pedro Hocking as he was known in Lima, was born in Pucallpa on July 7, 1938 and died in Lima on October 31, 2022. Pedro Hocking did not have a scientific background, but he was recognized as a naturalist for his contributions to the knowledge and documentation of Peruvian birds. Pedro Hocking was part of a generation passionate for biodiversity, for whom each locality visited was a new world that contained unknown species and that did not have field guides or current technological resources to identify in situ those that were already known. It was a time when the collection of specimens was the basic tool to know the biodiversity of a locality and the main activity of the expeditions. Although his main interest was birds, his contributions were not limited to them but included other groups of fauna as well.
5
artículo
Publicado 2021
Enlace
Enlace
The response of soil microbial activity to climate warming has been predicted to have a large destabilising effect on the carbon cycle. However, the nature of this feedback remains poorly understood, especially in tropical ecosystems and across annual to decadal timescales. We studied the response of bacterial community growth to 2 and 11 years of altered temperature regimes, by translocating soil across an elevation gradient in the tropical Andes. Soil cores were reciprocally translocated among five sites across 3 km in elevation, where mean annual temperature (MAT) ranged from 26.4 to 6.5°C. The bacterial community growth response to temperature was estimated using a temperature Sensitivity Index (SI): the log-ratio of growth determined by leucine incorporation at 35°C: 4°C. Bacterial communities from soil translocated to their original site (controls) had a growth response assumed ...
6
artículo
The study of forestry dynamics helps us to see the trends of forests in the future. In this research, forest dynamics was evaluated based on mortality and recruitment in two permanent plots located in premontane forests between 800 and 1500 masl in the province of Satipo, in the department of Junín, in the Central Forest of Peru. The Santa Teresa Primary Forest Plot (P-SPI) is located in a primary forest and recorded an initial population of 698 tree individuals, it was remeasured after an intercensal period of 5 years, registering 80 dead individuals, 77 recruits, with a final population of 695 trees and presented an annual mortality rate of 2,43% and an annual recruitment rate of 2,35%. While the Santa Teresa Late Secondary Forest Plot (P-SST) located in a late secondary forest had an initial population of 832 trees, it was remeasured after an intercensal period of 8 years, registerin...
7
artículo
The study of forestry dynamics helps us to see the trends of forests in the future. In this research, forest dynamics was evaluated based on mortality and recruitment in two permanent plots located in premontane forests between 800 and 1500 masl in the province of Satipo, in the department of Junín, in the Central Forest of Peru. The Santa Teresa Primary Forest Plot (P-SPI) is located in a primary forest and recorded an initial population of 698 tree individuals, it was remeasured after an intercensal period of 5 years, registering 80 dead individuals, 77 recruits, with a final population of 695 trees and presented an annual mortality rate of 2,43% and an annual recruitment rate of 2,35%. While the Santa Teresa Late Secondary Forest Plot (P-SST) located in a late secondary forest had an initial population of 832 trees, it was remeasured after an intercensal period of 8 years, registerin...
8
artículo
Publicado 2021
Enlace
Enlace
The Amazonian forests of Peru are among the most diverse and disturbed by anthropic activities on the planet, today there are still gaps on the composition of the communities and their inter-specific relationships. A forest inventory was carried out in a terraced forest in the Madre de Dios region, 5 blocks were established with 2 rectangular plots of 20m x 500m each to identify and measure individuals with diameter greater than 10 cm. 4429 trees were evaluated and 254 species, 165 genera and 53 families were identified. The distribution of diameter classes and height presents typical patterns of intervened forests, in this case by the extraction of wood decades ago. The average of the biodiversity indices are: Shannon-Wienner 4.039 ± 0.16 and α-Fisher 39.90 ± 9.23, indicating that there is a high diversity of species. The species of greatest ecological importance were: Tetragastris a...
9
artículo
Publicado 2021
Enlace
Enlace
The Amazonian forests of Peru are among the most diverse and disturbed by anthropic activities on the planet, today there are still gaps on the composition of the communities and their inter-specific relationships. A forest inventory was carried out in a terraced forest in the Madre de Dios region, 5 blocks were established with 2 rectangular plots of 20m x 500m each to identify and measure individuals with diameter greater than 10 cm. 4429 trees were evaluated and 254 species, 165 genera and 53 families were identified. The distribution of diameter classes and height presents typical patterns of intervened forests, in this case by the extraction of wood decades ago. The average of the biodiversity indices are: Shannon-Wienner 4.039 ± 0.16 and α-Fisher 39.90 ± 9.23, indicating that there is a high diversity of species. The species of greatest ecological importance were: Tetragastris a...
10
artículo
The impact of timber exploitation on biodiversity is usually increased by hunting in the exploited area. Proper forest management practices on areas under commercial exploitation minimize hunting and damage to the forest. Large species of Cracidae, the most endangered family of birds in the Neotropics, are among the first to be affected in a Neotropical forest damaged by timber-extraction activities, and where at least moderate hunting occurs. Herein an assessment of cracids is carried out in three areas with selective logging in Peru in 2004 and 2005, is used to evaluate hunting pressure. Tree inventory trails were used as transects, and density was calculated using the line transect methodology. Four species of cracids were evaluated, and density was calculated for three of them. The area with lower hunting pressure, Maderyja, showed higher cracid diversity and was the only with the pr...
11
artículo
The impact of timber exploitation on biodiversity is usually increased by hunting in the exploited area. Proper forest management practices on areas under commercial exploitation minimize hunting and damage to the forest. Large species of Cracidae, the most endangered family of birds in the Neotropics, are among the first to be affected in a Neotropical forest damaged by timber-extraction activities, and where at least moderate hunting occurs. Herein an assessment of cracids is carried out in three areas with selective logging in Peru in 2004 and 2005, is used to evaluate hunting pressure. Tree inventory trails were used as transects, and density was calculated using the line transect methodology. Four species of cracids were evaluated, and density was calculated for three of them. The area with lower hunting pressure, Maderyja, showed higher cracid diversity and was the only with the pr...
12
artículo
Publicado 2021
Enlace
Enlace
The Amazonian forests of Peru are among the most diverse and disturbed by anthropic activities on the planet, today there are still gaps on the composition of the communities and their inter-specific relationships. A forest inventory was carried out in a terraced forest in the Madre de Dios region, 5 blocks were established with 2 rectangular plots of 20m x 500m each to identify and measure individuals with diameter greater than 10 cm. 4429 trees were evaluated and 254 species, 165 genera and 53 families were identified. The distribution of diameter classes and height presents typical patterns of intervened forests, in this case by the extraction of wood decades ago. The average of the biodiversity indices are: Shannon-Wienner 4.039 ± 0.16 and α-Fisher 39.90 ± 9.23, indicating that there is a high diversity of species. The species of greatest ecological importance were: Tetragastris a...
13
tesis de maestría
Publicado 2020
Enlace
Enlace
El incremento de la deforestación en la Amazonía y sus impactos en los servicios ecosistémicos convierten a la restauración ecológica en una necesidad para garantizar la sobrevivencia de este bioma. En ese sentido, esta tesis estudió los factores que promueven el reclutamiento de árboles en la restauración de bosques. El estudio fue realizado durante la época seca de 2019 en 86 parcelas dispuestas en 6 minas cerradas, constituyendo una crono-secuencia de 27 años de áreas en proceso de restauración. Estas parcelas estuvieron ubicadas en la Amazonía del estado de Rondônia en Brasil. Se midieron diferentes factores asociados al manejo forestal y la dinámica ecológica, así como variables asociadas a los reclutas. Con los datos obtenidos se elaboraron modelos lineales mixtos en R para analizar el efecto de dichos factores en la riqueza de especies, composición específica y ...
14
artículo
Publicado 2021
Enlace
Enlace
1. Forest landscape restoration (FLR) has gained momentum globally and guidance is needed to identify those species, sites and planting methods that increase restoration success. Incorporating native Non-Timber Forest Product (NTFP) species in FLR approaches provides an opportunity to simultaneously deliver ecological and economic benefits. The Brazil nut tree is one of the most valuable Amazonian NTFP species and could fulfil a cornerstone role in Amazon FLR. However, the factors defining establishment success within Brazil nut restoration activities remain unknown. 2. Here, we evaluate the effect of management practices, restoration site (pastures, agroforestry, secondary forest and canopy gaps in old growth forest) and environmental conditions on the establishment success (tree growth, survival and fruit production) of Brazil nut restoration projects implemented by smallholders in the...
15
tesis de grado
Publicado 2025
Enlace
Enlace
Forest fires are one of the main problems that affect biodiversity and forest heterogeneity, which are caused by human or natural activities and even driven by climate change. The objective of this study was to analyze the severity of forest fires with the NBR index (Normalized Burn Ratio) in highland areas of Peru, and evaluate the vegetative recovery of forest species in the affected area with the NDVI index (Normalized Difference Vegetation Index). As a result, it was obtained that the type of vegetation in the affected area is the Andean Pajonal, the level of severity in the study area ranges from low to moderately high, with low severity being the predominant one, which occupies 57,562% of the study area. The NDVI evaluation of 2 weeks before, 2 weeks after and 3 months after the event show that there is a vegetative regeneration of the vegetation cover, two weeks after the event in...
16
artículo
Publicado 1992
Enlace
Enlace
In order to evaluate the effects of the partial removal of the Aotus vociferan and A. nancymae populations, we made captures in areas corresponding to the lowland forests of the Napo and Amazon river basins. In the first capture of A. vociferans executed in 1986 in the Tamboryacu River, 35.5% of the population was removed and in 1989 in the Santa Maria River 55% of the population was removed. During the 1991 evaluation, in the Tamboryacu River the increase of the remaining population reached 144.0% and 93.0% of the 1986 pre-capture level, while in the Santa María River, the increase reached 12.5% of the remaining population and 50% of the 1989 pre-capture level. In reference to A. nancymae, during the first capture executed in 1989 in the Tahuayo river, 50.0% of the population was removed and in the Yanayacu stream, 59.0% of the population was removed. Two years later, the increase in t...
17
artículo
Publicado 1992
Enlace
Enlace
In order to evaluate the effects of the partial removal of the Aotus vociferan and A. nancymae populations, we made captures in areas corresponding to the lowland forests of the Napo and Amazon river basins. In the first capture of A. vociferans executed in 1986 in the Tamboryacu River, 35.5% of the population was removed and in 1989 in the Santa Maria River 55% of the population was removed. During the 1991 evaluation, in the Tamboryacu River the increase of the remaining population reached 144.0% and 93.0% of the 1986 pre-capture level, while in the Santa María River, the increase reached 12.5% of the remaining population and 50% of the 1989 pre-capture level. In reference to A. nancymae, during the first capture executed in 1989 in the Tahuayo river, 50.0% of the population was removed and in the Yanayacu stream, 59.0% of the population was removed. Two years later, the increase in t...
18
artículo
Publicado 2019
Enlace
Enlace
In this work, the effect of two planting distances of Mauritia flexuosa on its height is studied, quantified the sex ratio and ecological requirements needed by the species, e.g. light and crown shape. We conducted this study in two plots, each one with a different planting distance, which were monitored throughout 6 years starting after 6 years of the establishment of the plantations. Increased planting distance in between individuals gave increased average height and thus increased growth. Individuals planted with higher vs lower distances grew in average 15.28 m and 13.1 m in height respectively. The proportion of fertile palms increased throughout time and was lower in plantations with higher palm densities. The presence of female individuals increased also with time. There was a strong competition among palm crowns related to light requirements in good and acceptable categories. We ...
19
artículo
Publicado 2022
Enlace
Enlace
This article will analyze the perception schemes and discursive platforms through which nineteenth-century foreign travelers presented in their countries of origin and to the national elites the natural environment and the sociocultural universe of the black communities that inhabited the Pacific coast of the young Republic of Colombia. It will be seen that the tropical rainforest was perceived as an inexhaustible storehouse of commodities or as a strategic axis of world trade. At the same time, the cultural legacy and the historical trajectory of the Afro-Pacific groups were disqualified, and they were taken as the greatest obstacle to the «progress» of this area, but also as a cheap workforce to serve the capitalist system that emerged after the decline of the Spanish Empire.
20
artículo
Publicado 2021
Enlace
Enlace
This work was supported by a CONCYTEC (Peru) -World Bank grant (Contract 011-2019-FONDECYT-BM-INC-INV). In Huayopata we thank the Cuba and Povea families for their hospitality and help during field work.
