Colombian Amazon Research Articles

Risk of human leptospirosis in Colombia: spatiotemporal analysis and related hydroclimatic factors.

Leptospirosis is an endemic zoonosis in tropical areas that is mainly related to rural activities; nevertheless, human leptospirosis (HL) outbreaks differ among regions. In Colombia, HL notifications are mandatory. Our objective was to determine the spatiotemporal distribution of HL in Colombia during 2007-2018 and its relationship with the main hydroclimatic variables. We determined the estimated incidence and lethality of HL according to department and year. The Bayesian spatiotemporal analysis of an autoregressive model (STAR) model included HL cases and hydroclimatic factors (average temperature, rainfall and relative humidity) for quarterly periods. During the study period, 10 586 HL cases were registered (estimated incidence: 1.75 cases x 105) and 243 deaths by HL (lethality 2.3%). The STAR model found association of HL risk with temperature (RR:6.80; 95% CI 3.57 to 12.48) and space. Quindío and three other Amazonian departments (Guainía, Guaviare and Putumayo) had a positive relationship with a significant number of HL cases, adjusted for quarterly precipitation and humidity. Spatial analysis showed a high risk of HL in departments of the western Andean Colombian regions. By contrast, in the spatiotemporal model, a higher HL risk was associated with temperature and departments of the North Colombian Amazon regions and Quindío in the Colombian Andean region.

The political economy of deforestation in the Colombian Amazon

The Colombian Amazon has experienced rapid forest loss in the past decades due to growing colonization, infrastructure development, and commercial agriculture expansion. While much of the analyses of deforestation in the Amazon have been in Brazil, there is a need to extend to Colombia where forest and land use exploitation are driven by post-conflict social and political dynamics. This research contributes to this knowledge gap by unpacking the mechanisms underpinning deforestation on the northwestern side of the Colombian Amazon. We used theory-building process-tracing to guide us in conceptualizing the underlying logics of deforestation in the region through qualitative text analysis of policy documents, articles, reports, and grey literature, and virtual semi-structured interviews with key national, regional and local actors. Findings indicate that the power vacuum resulting from the demobilization of FARC (Fuerzas Armadas Revolucionarias de Colombia), Marxist-Leninist guerrillas, acted as a window of opportunity for peasants, squatters, narco-traffickers, cattle ranchers, landlords, and other investors to access public lands and capitalize from converting forests to coca crops and pastures for cattle ranching. Accumulation of land and surplus primarily from cattle ranching and coca production has increased the ability of these actors to reshape the landscape and societal structures. Traditional elites and old and emerging narco-bourgeoisie have capitalized on preexisting power asymmetries by disproportionally accumulating land, money, gun power, influence, and prestige seeking to consolidate territorial hegemony, and controlling the means for material reproduction in society. Powerful actors use their resources and prestige to displace historically marginalized groups – such as indigenous communities, peasants and squatters – from their means of subsistence and production, resulting in the installation of a capitalist economy based on land rent and drug trafficking, where less powerful and marginalized actors engage in deforestation as means for capital accumulation and subsidizing their peasant and subsistence economies. All this has deepened forest loss, inequalities, and conflict over land access between actors. 

Dynamic analysis of resistance in Colombian elite Hevea brasiliensis genotypes as a breeding strategy for enhancing South American leaf blight management under disease non-escape conditions in the Amazon region

South American Leaf Blight (SALB) is the primary limitation to the establishment of new rubber (Hevea brasiliensis) crops in Latin America. This study aimed to assess the temporal dynamics of resistance to SALB in 99 elite Colombian genotypes and the IAN 873 cultivar (control) of H. brasiliensis in small-scale clone trials conducted under conditions with a high disease prevalence in the northwestern Colombian Amazon. Resistance monitoring was carried out on a monthly basis and analyzed over five climatic periods. Three variables were recorded: attack severity (AT, ranging from 0 to 4), reaction type (TR, ranging from 1 to 6) and stromal density (ST, ranging from 0 to 4). The maximum scores for TR and ST were used to classify the level of resistance of the genotypes. Highly significant differences in the mean values of AT, TR and ST among the genotypes, across the periods, and in the interaction between genotype and period were found. Over time, an increase in symptoms (AT) and signs (TR and ST) of SALB was observed. During the rainy periods, SALB intensity was highest, resulting in a leaf area affected ranging from 16 to 30%. Eight genotypes showed partial resistance (PR) (TR < 5 and ST < 2), while 16 genotypes demonstrated complete resistance (CR) (TR < 3 and ST = 0), and 76 genotypes were highly susceptible (HS) (TR > 5 or ST > 2). The temporal analysis identified 23 Colombian superior genotypes with varying degrees of SALB resistance, which can be a valuable breeding resource for improving SALB management in the Colombian Amazon region.

A new species of Guadua (Poaceae: Bambusoideae: Bambuseae: Guaduinae) from the Colombian Amazon

A new species of Guadua, Guadua bambuzoniae Londoño, is described from the Amazon region of Colombia, specifically in the tropical rainforest ecosystem. This species is unusual in that it grows in swampy areas and has several distinct characteristics that differentiate it from all other South American species of Guadua. These include erect and hollow culms at the base, as well as solid and arched culms at the middle and upper portions; primary branches that develop thorns at each culm node; usually a falcated, prominent and fimbriate auricle on the upper part of the culm sheath on one side; elongated and glabrous leaf sheaths; a usually straight, linear-lanceolate pseudospikelet; lemmas pubescent toward the margins with the margins densely ciliated, but otherwise glabrous, and a conspicuous and strong mucron; and paleas only slightly shorter than the lemmas, with broadly winged keels. Here, we provide a geographical distribution map, illustrations, photographs, and a morphological comparison with G. macrospiculata and G. uncinata.

Structure, floristic composition, and distribution of swamp forests across a white‐water flood‐plain in the Colombian Amazon

AbstractQuestionsThe fluvial dynamics of meandering white‐water rivers of Amazonia drive vegetation primary succession. Directional successional processes have been recorded for the seasonal várzea forests that occupy well‐drained soils on levees and point bars across the spatial gradient of the flood‐plains. However, the types of forests occupying the swampy depressions interspersed between the point bars and their distribution along the flood‐plain's spatial gradient are poorly understood. Here, we aimed to unravel the spatial patterns of swamp forests along the sequence defined by an axis perpendicular to the river and the relationship with edaphic and spatial factors.LocationThe flood‐plains of the middle Caquetá River basin, Colombian Amazonia.MethodsForest types were identified by cluster analysis performed on 42 square plots (33 m × 33 m) set in poorly drained depressions of the flood‐plain. Floristic composition and vegetation structure as response data, and edaphic and spatial variables as predictors, were analyzed through partial redundancy analysis (pRDA). The effect of geographic position was included by using the first two axes of a principal coordinates of neighbor matrix analysis as conditional factors in the pRDA.ResultsThe three identified swamp forest types were not arranged along a directional spatial pattern. Permanent várzea forests, closest to the river, showed the greatest diversity and alluvial sediment input. Oxandrales, furthest from the river, dominated by Oxandra polyantha, showed the greatest tree density, basal area and soil sand content, and received additional flooding from black‐water streams. Cananguchales, dominated by Mauritia flexuosa, exhibited the highest dominance and soil organic matter layer thickness. Distribution of the permanent várzea and oxandrales was relatively constrained by the distance to the river, whereas that of the cananguchales was not.ConclusionsFlooding dynamics delay vegetation development of the swamp forests in permanent várzea and oxandrales. Cananguchales keep accumulating organic matter, becoming ombrotrophic peats after isolation from the river flooding influence. The swamp forests across these flood‐plains are far from being arranged along a linear sequence.

Visual evaluation of soil structure is a reliable method to detect changes in the soil quality of Colombian Amazon pasturelands

AbstractThe visual evaluation of soil structure (VESS) is an affordable and easy‐to‐use method for assessing soil quality that could help in the early detection of soil quality changes in pasturelands of less developed countries where ranchers cannot afford quantitative soil studies. Here, we assessed the soil quality of three pasture areas in the Colombian Amazon region using the VESS method and tested its suitability through a correlation analysis with key physical and biochemical soil indicators of quality measured at the same study locations. Moreover, by integrating all assessed soil indicators, we determined a soil quality index (SQI) to correlate with VESS scores. A forest area was used as a reference to evaluate changes in soil indicators and soil quality due to pasture use for &gt;25 years. Our results revealed high VESS scores, indicating poor soil quality in pasture areas and suggesting a compaction process that starts at 6.5 cm soil depth, corroborated by increases in soil bulk density, soil resistance to penetration, and reduction in soil porosity. Soil C and N contents were 35% and 33% lower in pasture than forest. This same pattern was observed in the geometric mean of the enzymatic activity. The VESS scores were significantly correlated with most of physical and biochemical soil indicators and with the overall SQI, demonstrating the ability of VESS to integrate and reflect attributes related to the essential physical, chemical, and biological functioning of soils from the Colombian Amazon region, becoming a useful tool for detecting signs of soil quality degradation in pasturelands.

Avifauna of an exploratory oil drilling area in a previously deforested amazonian landscape

Oil exploration and exploitation activities have negative effects on biodiversity. This is mainly due to secondary causes such as increased colonization following the opening of new roads. However, little is known about the effects that oil industry may have on previously deforested landscapes. In this study, we characterized the avifauna of an exploratory oil drilling area in the Colombian Amazon, where the landscape is dominated by pastures and monoculture crops with some patches of scattered secondary forests. The avifauna was typical of intervened Amazonian landscapes in which most specialist forest birds are absent. The few that were present were recorded in only one or a small number of the study localities, despite the fact that the same habitats were found in practically all of them. The absence of these species and the isolation of the few remaining ones is due to processes prior to the implementation of oil activity. In this sense, the construction of new infrastructure and the adaptation of the existing one will not imply a significant reduction of the remaining forest areas which, according to current regulations, must be protected. Conversely, if the forest offsetting process required for oil exploration and exploitation is well directed, this could result in an increase in the connectivity of the remaining forest fragments, favoring species mobility and a possible increase in diversity.

Microbial diversity and abundance of Hg related genes from water, sediment and soil the Colombian amazon ecosystems impacted by artisanal and small-scale gold mining

The Amazon region abounds in precious mineral resources including gold, copper, iron, and coltan. Artisanal and small-scale gold mining (ASGM) poses a severe risk in this area due to considerable mercury release into the surrounding ecosystems. Nonetheless, the impact of mercury on both the overall microbiota and the microbial populations involved in mercury transformation is not well understood. In this study we evaluated microbial diversity in samples of soil, sediment and water potentially associated with mercury contamination in two localities (Taraira and Tarapacá) in the Colombian Amazon Forest. To this end, we characterized the bacterial community structure and mercury-related functions in samples from sites with a chronic history of mercury contamination which today have different levels of total mercury content. We also determined mercury bioavailability and mobility in the samples with the highest THg and MeHg levels (up to 43.34 and 0.049 mg kg−1, respectively, in Taraira). Our analysis of mercury speciation showed that the immobile form of mercury predominated in soils and sediments, probably rendering it unavailable to microorganisms. Despite its long-term presence, mercury did not appear to alter the microbial community structure or composition, which was primarily shaped by environmental and physicochemical factors. However, an increase in the relative abundance of merA genes was detected in polluted sediments from Taraira. Several Hg-responsive taxa in soil and sediments were detected in sites with high levels of THg, including members of the Proteobacteria, Acidobacteria, Actinobacteria, Firmicutes and Chloroflexi phyla. The results suggest that mercury contamination at the two locations sampled may select mercury-adapted bacteria carrying the merA gene that could be used in bioremediation processes for the region.

High-risk HPV prevalence and vaccination coverage among Indigenous women in the Colombian Amazon: Implications for cervical cancer prevention. Cross-sectional study.

Cervical cancer, primarily caused by Human Papillomavirus (HPV) transmission through sexual contact, necessitates comprehensive strategies to combat its impact on women's health. Yet, certain underserved populations, such as low socioeconomic and ethnic minority groups, encounter barriers in accessing timely interventions and early diagnosis. This cross-sectional study was conducted with the aim of assessing HPV prevalence, genotype distribution, and co-infections among 280 adult women residing in a Colombian Indigenous Reserve within the Amazon region. The research adhered to a community-centric approach that respected cultural norms, native languages, and Indigenous authorities' permission. The study revealed an overall HPV infection prevalence of 31.1% (n = 87, 95% CI 25.7-36.8), with 22.5% (n = 63, 95% CI 17.7-27.8) of women infected by at least one high-risk HPV genotype and 15.0% (n = 42, 95% CI 11-19.7) infected by at least one LR genotype. These results align with the findings of other Colombian studies. Notable high-frequency genotypes included 16, 52, 66, 56, and 68, with the most common combinations being [66-52] and [66-58]. The study also assessed the prevalence of HPV vaccination, revealing a rate of 22.9%, lower than the national average. In vaccinated women, the prevalence of genotypes 16 and 18 was significantly reduced, as anticipated. Importantly, it was observed that 57.1% of all high-risk HPV infections could have been prevented with the use of the nonavalent vaccine. These findings underscore the critical need to enhance adherence to early cervical cancer detection and monitor positive cases to evaluate high-risk HPV persistence. Efforts should be directed toward continuing vaccination coverage against high-risk HPV 16 and 18 with the quadrivalent vaccine, while also striving to make the nonavalent vaccine accessible for inclusion in large-scale public health programs. Additionally, the study did not identify a specific pattern of co-infection. The study emphasizes the significance of adopting a locally tailored epidemiological approach to guide and promote cervical cancer prevention efforts in Indigenous communities.

Finnegans is the Tolstoy of the Uitoto

The Word, as the creative principle of life, is a concept found in many cultures, from the Hebraic to the Uitotos (or Murui) of the Colombian Amazon. The author finds parallels between the immersion of Joyce´s Finnegans Wake in the Word as the key to unlocking different but interrelated dimensions of reality, and the cosmo-vision of the Murui. Finnegans Wake presents a panoptic view of practically the whole of life and history in the form of the dream world of a Dublin tavern owner. It deploys a complex use of word play, hidden meanings and mutations of language to depict both the conscious and subconscious perceptions of our primal humanity. Similarly, virtually every word of the Murui myths has multiple meanings and they embody a manual of correct thought and behavior ranging from spirituality to the practicalities of daily life. Their premier shamanic plants, mambe and ambil, derivatives of coca and tobacco, respectively, are the inspiration for the nightly colloquiums in their malocas (longhouses) where the meanings of their myths are teased out by the participants, guided by their medicine man, in a free-ranging conversation that, while it seems to be digressive, adheres, as does Joyce, to the inner logic of the Word. The author ends with some reflections on his own struggles, as a writer to grapple with the Word, which, as it communicates, also mystifies. For the Murui, this urge towards omniscience may have arisen because their survival depended on articulating all of the interrelated nuances of their environment.

How Accurately Are Climatological Characteristics and Surface Water and Energy Balances Represented for the Colombian Amazon Basin?

Context: The Colombian Amazon basin (CAB) is characterized by having many areas with few or no in situ observations. To help fix this shortcoming, there are different gridded datasets that represent meteorological variable estimates from in situ, satellite-based, merged, and model-based products. However, before using them, it is necessary to evaluate their performance.Methods: We analyzed the capacity of five grid datasets to represent the annual cycle, the annual means, and the interquartile range of temperature and the variables that intervene in the surface water and energy balances of the CAB. The five datasets were a regional climate model (REMO) and four reanalyses (ERA40, ERA-Interim, NCEP/NCAR, and NCEP-v2). For the temperature and precipitation analyses, the Delaware, GPCP, CPC, CMAP, and CMAP-v2 datasets were also taken into account. Results: The average annual temperature cycle in the CAB has an unimodal behavior, with higher values between October and March. Only Delaware and ERA-Interim describe this behavior and exhibit values close to those of the observations. The average annual cycle of precipitation is also unimodal, with higher values between March and July. Delaware, GPCP, CPC, and ERA-Interim describe this behavior, although ERA-Interim overestimates precipitation. Additionally, the four reanalyses, especially ERA-Interim, show an unexpected trend of increase in mean annual precipitation. As for the water balance, the precipitation and runoff maps of ERA-Interim and REMO show higher values in the foothills and east of 73 degrees W, a pattern that shows better agreement with the observations than those of the other datasets. ERA-Interim, REMO, and ERA-40 meet the closure condition of both the long-term water and the energy budgets. However, REMO and ERA-Interim overestimated precipitation, ERA-40 underestimated it, and ERA-Interim overestimated solar radiation. This implies that some of the other variables for the water and energy balances are also poorly estimated. Conclusions: The five gridded datasets that allow studying surface water and energy balances are not adequate, so better models and reanalyses are required.

Political Interactions in Deforestation Dynamics in The Brazilian and Colombian Amazon (2016-2022)

Objetivo: Este artigo analisa de que forma o impeachment da presidente Dilma Roussef, no Brasil, e o Acordo de Paz entre o governo e as FARC, na Colômbia, em 2016, contribuíram para as alarmantes taxas de desmatamento na Amazônia. Metodologia: Foi realizada uma minuciosa revisão da literatura sobre a história de ocupação dos territórios amazônicos brasileiro e colombiano, bem como de relatórios, comunicados, notícias jornalísticas e demais documentos afins. Resultados: Concluiu-se que, no caso brasileiro, houve um proposital desmonte das políticas de proteção da Amazônia. E, na Colômbia, a desmobilização das FARC, representou o salvo conduto para a expansão do processo de derrubada da floresta. Verificou-se o alastramento e a sobreposição de diversos crimes ambientais praticados pelas organizações criminais instaladas na região, destacadamente a extração ilegal de madeira, minérios e pescado, associados ao fortalecimento do narcotráfico e ao aumento do número de pessoas assassinadas. Originalidade e relevância: este é o primeiro estudo que estabelece comparações políticas entre as causas do aumento do desmatamento e demais crimes ambientais associados no Brasil e na Colômbia. Assunto que ocupa a agenda ambiental mundial, bem como as políticas de segurança pública de ambos os países.

Adaptive Responses of Biofortified Common Bean Lines to Acidic Soil and High Temperatures in the Colombian Amazon Region

One of the strategies to combat micronutrient malnutrition is by developing biofortified common bean lines (Phaseolus vulgaris L.) capable of tolerating different stress conditions. In this study, the adaptive responses of different biofortified bean lines grown under combined stress of acidic soil and high-temperatures were evaluated in the Colombian Amazon. A total of 247 common bean lines from the Mesoamerican gene pool were used to determine the adaptive response in terms of phenological, physiological, and agronomic behavior under combined stress conditions. The lines tested were obtained from different single crosses, double crosses, and backcrosses between different bean materials, of which 146 were obtained from F4 families with high iron (Fe) content in seed and 99 common bean lines from F5 families. Different bean lines had grain yields (GY) higher than 1400 kg ha−1 from the F5 (lines: 859, 805, 865, and 657) and F4 (lines: 2853 and 2796) families. The superior performance of these lines was related to a higher photosynthate partitioning that has allowed an increase in pod formation (pod partitioning index, PPI) from the canopy biomass (CB) and grain filling (pod harvest index, PHI; harvest index, HI), resulting in higher values of GY. Values of GY were correlated with CB (r = 0.36), PPI (r = 0.6), PHI (r = 0.68), and HI (r = 0.8, p &lt; 0.001). This increase in agronomic performance is due to a greater allocation of energy to the photosynthetic machinery (ΦII) and its dissipation in the form of heat (ΦNPQ), with increases in the leaf temperature difference (LTD). Based on the results obtained, six biofortified lines of common bean (lines F5: 859, 805, 865, and 657; lines F4: 2853 and 2796) showed traits of tolerance to combined stress and can serve as progenitors to increase Fe and Zn concentration in the seeds of lines that tolerate the combined stress from acidic soil and high temperature in the Colombian Amazon region.

Leaf antioxidant activity in Colombian elite Hevea brasiliensis genotypes as a breeding strategy for water deficit tolerance under Amazonia conditions.

This study evaluated the foliar antioxidant activity in nine Hevea brasiliensis genotypes from the ECC-1 (Élite Caquetá Colombia) selection and IAN 873 cultivar (control) in trees in the growth stage in two large-scale clonal trials in response to different climatic (semi-humid warm and humid warm sites) and seasonal (dry and rainy periods) conditions in the Colombian Amazon. The results indicated that Reactive Oxygen Species (ROS) production increased under conditions of lower water availability (dry period), leading to lipid peroxidation, high defense of photosynthetic pigments, and development of better osmotic adjustment capacity in the ECC 64, IAN 873, ECC 90, and ECC 35 genotypes due to high concentrations of carotenoids (0.40 mg g-1), reducing sugars (65.83 μg mg-1), and malondialdehyde (MDA) (2.44 nmol ml-1). In contrast, during the rainy period, a post-stress action was observed due to high contents of proline and total sugars (39.43 μg g-1 and 173.03 μg g-1, respectively). At the site level, with high Photosynthetically Active Radiation (PAR) values (1143 moles photons m-2 s-1), temperature (32.11°C), and lower precipitation (135 mm), higher antioxidant activity (chlorophylls a, b and total, carotenoids, and proline) was recorded at the humid warm site, demonstrating that the ECC 90, ECC 64, and ECC 66 genotypes are tolerant to water deficit compared to IAN 873. The ECC 64 genotype, independent of seasonal changes and site conditions, presented the highest contents in Chl a, total Chl, reducing sugars, total sugars, and MDA, showing a tendency to adapt to fluctuating conditions. This study showed that water fluctuations do not cause the same metabolic responses, these vary within the same species, depending on their developmental stage and the climatic and seasonal variations characteristic of the Colombian Amazon.

Etnoictiología de los grupos étnicos Piapoco, Piaroa, Puinave y Sikuani que habitan La Selva de Matavén (Vichada, Colombia)

ABSTRACT Since prehistoric times, indigenous communities have relied on fish as a staple source of protein for their subsistence. In most cases, fish is the sole source of income and of animal protein for the communities. Nevertheless, the documentation of fish from an ethnological perspective is rare, and biological research alone might not provide sufficient information required to manage fisheries resources. We discuss the traditional ichthyological knowledge of the Piapoco, Piaroa, Puinave, and Sikuani ethnic groups inhabiting the Matavén Forest (Vichada, Colombia). Each group has its perception regarding knowledge, at times detailed, of fish groups, their distribution, and uses. To obtain information regarding traditional ichthyological knowledge, fish were collected over one month at 31 sampling sites in different habitats along the lower Matavén River basin. The fish were identified by formal taxonomy and the informal classification by experienced fishermen of the four ethnic groups. There was consistency among the names given by the ethnic groups and formal taxonomy. The indigenous collaborators used binomial classification systems in which the organisms are grouped at family and genus levels and, to some extent, categorization depends on distribution within the aquatic habitats (i.e., rivers, streams and lagoons). The indigenous collaborators did not provide sociocultural or mythological information related to the fishes. Our findings contribute to the development of conservation and rural development projects in the Colombian Amazon.

Fermentation and its effect on the physicochemical and sensory attributes of cocoa beans in the Colombian Amazon.

Cocoa (Theobroma cacao L.) is the basic raw material to produce chocolate and other derivatives such as cocoa butter, cocoa powder and cocoa liquor (cocoa paste), which requires a fermentation process that affects its chemical composition and sensory profile. The objective of this study was to monitor the biochemical, physical and sensory changes during fermentation of cocoa beans in cocoa bean processing plants in the department of Caquetá, Colombia. During fermentation, the temperature of the mass and the pH of the pulp and beans were monitored at the different cocoa bean processing plants (Sites ASOACASAN ASA, COMICACAO CMI, COMCAP COC). Also, at two points during fermentation (days 4 and 7), physical properties of the bean were determined, such as variables related to bromatological composition, polyphenolic compounds and antioxidant activity as sensory attributes at the different sites. An increase in dough temperature was found, however the pH of the cotyledon decreased during the fermentation process and the fat and moisture content varied with fermentation time. At the site level, total polyphenol content (TPC), total flavonoids (TF), 1,1-diphenyl-2-picrylhydrazil (DPPH) and ferric reducing antioxidant power (FRAP) contents were statistically different, with COC being different from the other sites. The TPC was higher at the COC site (507 mg gallic acid equivalent GAE/g Cocoa) with respect to the other sites (< 360 mg GAE/g Cocoa). The TF content followed a similar behavior to TPC, with significant differences between sites and differences between fermentation times for ASA. The TF was higher in COC (309.1 mg catechin/g cocoa) with respect to CMI (215.6 mg catechin/g cocoa) and ASA (185.7 mg catechin/g cocoa). Values in DPPH ranged from 5869.3 to 7781.8 μmol Trolox/g cocoa and for the FRAP assay ranged from 369.8 to 606.7 mg ascorbic acid AA/g cocoa among the sites. It was found that the time and management of the fermentation process has a significant impact on the parameters (biochemical, physical and sensory) of cocoa beans. Therefore, it is necessary to standardize the fermentation process to achieve a quality product that meets the needs of the market.

Analysis of the distribution and abundance of two species of cat’s claw (Uncaria sp.) based on the knowledge of Tikuna indigenous communities in the southern Colombian Amazon

Uncaria guianensis (Aublet) J.F. Gmel and U. tomentosa (Willd. ex Roemer &amp; Schultes) D.C., commonly known as cat’s claw, are species with medicinal and commercial value in the Amazon region. Given the intensive extraction of forest resources for commercialization in the region, the distribution and abundance of these species there should be determined. So far, the environmental and edaphic conditions influencing Uncaria tomentosa growth and density are better known than those of U. guianensis. Besides, cat’s claw species distribution in the Colombian Amazon has not been sufficiently studied. In this context, the present study was conducted in two indigenous Tikuna communities together with local experts to make the botanical identification of the two Uncaria species. Visits were made to register the landscapes and soils where these plants grow. We found that U. guianensis has a higher distribution and abundance in the southern Colombian Amazon than U. tomentosa. Both species grow in flooded alluvial areas with Entisol-type soils and dryland Oxisol-type soils. U. tomentosa grows especially in primary and secondary forest Oxisol soils on drylands. Our findings suggest that none of these two species have a homogeneous distribution in the region, which explains why their use varies from one area to the other.

Review of the State of Knowledge of the Flora of Vaupés (Colombia)

The department of Vaupés, located in the Amazon region of Colombia, covers approximately 65.268 km2, representing 5.7% of the country's territory. The department hosts a rich floristic diversity that plays a crucial role in the dynamics of local ecosystems. This richness gains even greater importance due to the ethnobotanical use by ancestral communities over time. Despite the increase in literature production on the flora of Vaupés in recent decades, there is a lack of an updated review specifically focused on existing bibliography related to the department's flora. This work aims to conduct a comprehensive review up to 2023 of the knowledge production in the department related to flora, using analyses of various indicators. Different databases such as Scopus, Scielo, WoS, academic search engines like Google Scholar, and repositories were used for the review. Two inclusion criteria were applied to the documents: 1) The documents had to focus on municipalities or localities within the department as the study area, and 2) The research had to be related to flora. Graphs and tables were employed for analyses to identify patterns and trends. In total, 92 publications related to the flora of Vaupés were identified, reflecting a significant increase compared to previous studies. Most publications were concentrated in the municipality of Mitú, primarily led by Richard Evans Schultes, who stood out as the main author with 49 publications. While the research article stood out as the most used form of publication, another significant source was gray literature, primarily derived from undergraduate and postgraduate theses. Ethnobotany and taxonomy emerged as dominant areas of research, encompassing 41% and 34% of the publications, respectively, reflecting the importance given to traditional knowledge and accurate species identification in the region. Temporal analysis revealed publication peaks between 1974-1984 and 2004-2014. The concentration of publications by some authors, especially Richard Evans Schultes, emphasizes the need for diversification in research perspectives. It is crucial to encourage new researchers and interdisciplinary collaboration to enrich research in Vaupés. Finally, addressing knowledge gaps in less-explored areas such as ecology, palynology, phytogeography, and plant physiology is essential for a holistic understanding of the department's ecosystem.

A new species of &lt;i&gt;Catasetum&lt;/i&gt; (Cymbidieae: Catasetinae) from the Colombian Amazonia

A new species, Catasetum caquetense from the Caquetá department of the Colombian Amazonia, is described and illustrated. Catasetum caquetense is morphologically distinct from similar species such as C. tuberculatum in its rectangular, entire, denticulate, prominent apiculate basal callus surrounded by inconspicuous crown-shaped protrusions with an extra callus towards the apex that partially narrows towards the mid-lip. Information about its distribution, ecology, habitat, and taxonomic comments on morphologically similar species is also provided. With this addition, the genus comprises eight species in the department of Caquetá.

Sacred Sites of the Amazon

Scientists have studied different aspects of the complex reality of the Amazon Basin. Among the main areas of research are such topics as social organization, cosmology, mythology, ecological adaptations, and conservation of the tropical rainforest. One aspect that has not been addressed sufficiently is the archaeological investigations of the sacred sites of the Amazon. Due to their importance, this is why the sacred petroglyphs were chosen as the topic of our research. This article attempts to present the state of archaeological investigations in the Colombian Amazon and the importance of the sacred petroglyphs for our understanding of the Yucuna Indian culture.