Landscapes and Landforms of Colombia

Hermelín, Michel

doi:10.1007/978-3-319-11800-0

Cited by 13 publications

(2 citation statements)

References 15 publications

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“…25 Ma (Graham et al, 2018). Therefore, other factors such as nutrient rich soils (Hermelin, 2015) derived from igneous rocks and a quaternary volcanic horizon in the Central Cordillera were suggested as factors that could contribute to the high regional diversity (Graham et al, 2018). With our data we show that the recent (<10 Ma) uplift of the northern segment of the Central Cordillera likely contributed to these biodiversity patterns.…”

Section: Northern Andesmentioning

confidence: 99%

Topographic response to Neogene variations in slab geometry, climate and drainage reorganization in the Northern Andes of Colombia

Pérez-Consuegra¹,

Ott²,

Hoke³

et al. 2022

Preprint

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The tropical Northern Andes of Colombia are one the world's most biodiverse places, offering an ideal location for unraveling the linkages between the geodynamic forces that build topography and the evolution of the biota that inhabit it. In this study, we utilize geomorphic analysis to characterize the topography of the Western and Central Cordilleras of the Northern Andes. We supplement our topographic analysis with erosion rate estimates based on gauged suspended sediment loads and river incision rates from volcanic sequences. In the northern Central Cordillera, an elevated low-relief surface (2,500m in elevation, ~40x110 km in size) with quasi-uniform lithology and surrounded by knickpoints, indicates a recent increase in rock and surface uplift rate. Whereas the southern segment of the Central Cordillera shows substantially higher local relief and mostly well graded river profiles consistent with longer term uplift-rate stability. We also identify several areas of major drainage reorganization, including captures and divide migrations that are supported by our erosion and incision rate estimates. These changes in the topography coincide with the proposed location of a slab tear and flat slab subduction under the northern Central Cordillera, as well as with a major transition in the channel slope of the Cauca River. We identify slab flattening as the most likely cause of strong and recent uplift in the Northern Andes leading to ~2 km of surface uplift since 8-4 Ma. Large scale drainage reorganization of major rivers is probably mainly driven by changes in upper plate deformation in relation to development of the flat slab subduction geometry; however, other factors such as climate and emplacement of volcanic rocks likely play secondary roles in this process. Several isolated biologic observations above the area of slab flattening suggest that surface uplift isolated former lowland species on the high elevation plateaus, and drainage reorganization may have influenced the distribution of aquatic species.

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Section: Northern Andesmentioning

confidence: 99%

Topographic response to Neogene variations in slab geometry, climate and drainage reorganization in the Northern Andes of Colombia

Pérez-Consuegra¹,

Ott²,

Hoke³

et al. 2022

Preprint

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“…Além disso, feições cársticas como depressões fechadas e cavernas também ocorrem associadas a outros tipos litológicos, especialmente recorrente em rochas siliciclásticas (Hardt e Pinto, 2009;Fabri et al, 2014). Outros trabalhos relatam dolinas em formações ferríferas, como na região de Carajás-PA, pelo colapso de crostas ferruginosas (canga) decorrentes de cavernas subjacentes (Campos e Castilho, 2012, Piló et al, 2015, Maurity e Kotschoubey, 1995. Inúmeras depressões fechadas foram registradas na bacia do Rio Pelotas (SC-RS), associadas a rochas vulcânicas da Formação Serra Geral (Maciel Filho et al, 2013), o que reforça a grande diversidade de cenários potenciais à ocorrência de dolinas no Brasil.…”

Section: Mapeamento De Dolinas No Brasilunclassified

Um Panorama Sobre Mapeamentos de Dolinas no Brasil, Feições Elementares do Carste

Ferreira

Uagoda

2020

Rev. Bras. Geog. Fis.

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O carste se desenvolve sobretudo pela ação da dissolução em subsuperfície, na interação da água com rochas solúveis, especialmente as carbonáticas. Apesar do processo de carstificação nem sempre se apresentar em superfície, a ocorrência de dolinas, feições consideradas características, indica maior proeminência desse fenômeno. Muitos trabalhos internacionais se dedicaram ao mapeamento de dolinas com objetivos diversos, como comparar o nível de carstificação e evolução dos ambientes onde estão inseridas, relacionar o desenvolvimento destas feições com estruturas geológicas ou realizar análises hidrológicas de caráter ambiental. Por outro lado, são poucos os trabalhos com esta temática realizados no Brasil, parte concentrada em regiões cársticas tradicionais, como o Vale do Ribeira-SP, Chapada Diamantina-BA e nos carbonatos de Minas Gerais, e os demais dispersos pelo país, muitos em rochas não carbonáticas. Neste sentido o objetivo deste artigo é realizar uma revisão dos trabalhos sobre mapeamento de dolinas, com enfoque nos aspectos morfométricos e quantificação, visando especialmente elaborar um primeiro panorama sobre como o tema é abordado no Brasil. Observou-se que a maior parte dos estudos nacionais alcançou resultados de frequência (nº/km²) bastante inferiores aos identificados em estudos internacionais. Essa discrepância foi atribuída a alguns aspectos, como a adoção de fontes de dados inadequadas em escala abrangente, a escolha de áreas muito extensas para a análise ou de fato a investigação em áreas pouco propícias a ocorrência de dolinas. An Overview of Doline Mappings in Brazil, Karst's Elemental Features A B S T R A C TKarst develops mainly by the action of dissolution in subsurface, in the interaction of water with soluble rocks, especially carbonates. Although the karsification process does not always appear on the surface, the occurrence of dolines, features considered characteristic, indicates a greater prominence of this phenomenon. Many international works have been devoted to the mapping of dolines with different objectives, such as comparing the level of karsification and evolution of the environments in which they are inserted, to relate the development of these features to geological structures or to perform environmental hydrological analyzes. On the other hand, there are few studies on this subject in Brazil, concentrated part in traditional karst regions such as Vale do Ribeira-SP, Chapada Diamantina-BA and carbonates of Minas Gerais, and the others scattered around the country, many in non-carbonate rocks. In this respect, the objective of this article is to review the work on doline mapping, with a focus on morphometric aspects and quantification, aiming in particular to elaborate a first overview about how the theme is approached in Brazil. It was observed that most of the national studies reached frequency results (n°/km²) much lower than those identified in international studies. This discrepancy was attributed to some aspects, such as the adoption of inadequate data sources in a wide scale, the choice of very extensive areas for analysis or indeed the investigation in areas less favorable to the occurrence of dolines.Keywords: karst; doline; density.

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Living in the edge: large terrestrial mammal and bird species traits and the ability to cope with extreme environmental conditions and human disturbance in a tropical dry forest in Colombia

Montes-Rojas,

Hernández-Rodríguez,

Galvis

et al. 2024

J. Trop. Ecol.

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Tropical drylands are characterized by extreme environmental conditions that, coupled with anthropogenic habitat degradation, can limit the occurrence of native species. Species that are most sensitive to these pressures may be prone to disappear in the context of climate change. In this study, we evaluated the influence of environmental and anthropogenic variables on the occurrence of large mammals and birds at the Tatacoa Desert, an arid region in central Colombia. We tested the relationship between the magnitude of the species’ responses to environmental, human-related variables and to body mass, and percentage of carnivory. Overall, we found a positive association between forest cover and the occupancy of the largest mammals (> 8kg), negative associations between solar radiation and human footprint with individual species occupancy, and a positive association of species occupancy with distance to touristic sites. Our results suggest that the largest and/or more carnivore species may be affected positively by forest cover and negatively by intense solar radiation highlighting the consequences of the increasing process of desertification on large mammals and birds at the upper Magdalena River basin of Colombia under the current scenario of global climate change.

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Landscapes and Landforms of Colombia

Cited by 13 publications

References 15 publications

Topographic response to Neogene variations in slab geometry, climate and drainage reorganization in the Northern Andes of Colombia

Topographic response to Neogene variations in slab geometry, climate and drainage reorganization in the Northern Andes of Colombia

Um Panorama Sobre Mapeamentos de Dolinas no Brasil, Feições Elementares do Carste

Living in the edge: large terrestrial mammal and bird species traits and the ability to cope with extreme environmental conditions and human disturbance in a tropical dry forest in Colombia

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