We studied the genetic variability of Dipteryx ferrea shihuahuaco in seven natural populations from the Peruvian Amazon using nine microsatellite loci. The results showed a high genetic diversity shown by the high polymorphism (total alleles = 135, mean alleles per locus = 15 ± 6 alleles) and allelic richness (Macuya = 11 and Iñapari = 8, maximum and minimum allelic richness, respectively). The analysis of principal components showed a strong overlap among the populations, which added to the low values of interpopulation genetic distance (from 0.07 to 0.10), reveals a high genetic similarity among populations. The dendrogram based on the genetic distance of Shared Allele showed populations clustered in three main groups, the first formed by Manu and Iñapari populations (group A, bootstrap = 91%), the second by Contamana and Macuya (group B, 60%), and the third by Tamaya, Santa Clara e...

Se presentan los resultados preliminares del crecimiento inicial de capirona Calycophyllum spruceanum, a partir de la siembra de semillas al voleo, para ello, primero se mezcló las semillas junto con arena blanca y se esparció manualmente en un área de 40 m2. Posterior a la germinación, se realizaron mediciones biométricas trimestralmente a los individuos seleccionados. En 18 meses de evaluación se alcanzó un promedio en altura de 3,75 m (±0,65) y en diámetro de fuste de 3,44 cm (±1,46). Este experimento buscó comprobar la eficacia del método de siembra al voleo para capirona, una especie forestal maderable de gran valor, que hoy en día se encuentra en riesgo de desaparición debido a que sus poblaciones naturales vienen siendo afectadas por la sobreexplotación. Las cifras de crecimiento obtenidas fueron satisfactorias, lo que demuestra que este método de siembra es viable...

We studied the genetic variability of Dipteryx ferrea shihuahuaco in seven natural populations from the Peruvian Amazon using nine microsatellite loci. The results showed a high genetic diversity shown by the high polymorphism (total alleles = 135, mean alleles per locus = 15 ± 6 alleles) and allelic richness (Macuya = 11 and Iñapari = 8, maximum and minimum allelic richness, respectively). The analysis of principal components showed a strong overlap among the populations, which added to the low values of interpopulation genetic distance (from 0.07 to 0.10), reveals a high genetic similarity among populations. The dendrogram based on the genetic distance of Shared Allele showed populations clustered in three main groups, the first formed by Manu and Iñapari populations (group A, bootstrap = 91%), the second by Contamana and Macuya (group B, 60%), and the third by Tamaya, Santa Clara e...

We present the preliminary results of the initial growth of capirona Calycophyllum spruceanum from a broadcast seed sowing in which the seeds were first mixed together with white sand and manually spread over an area of ​​40m2. After germination, biometric measurements were recorded every three months for selected individuals. In 18 months of evaluation, an average height of 3.75m (±0.65) and stem diameter of 3.44cm (±1.46) were reached. This experiment sought to verify the efficacy of the broadcast seed sowing for capirona, a highly valuable timber forest species, which today is at risk of disappearance due to the fact that its natural populations are being affected by overexploitation. The growth figures obtained were satisfactory, which shows that this sowing method is viable in becoming a new propagation alternative for the species.

Se determinó la variabilidad genética del shihuahuaco Dipteryx micrantha en siete poblaciones naturales de la Amazonía peruana mediante el análisis de nueve loci microsatélites. Los resultados muestran una alta diversidad genética evidenciada en el elevado polimorfismo (total de alelos = 135, media de alelos por locus = 15 ± 6 alelos) y riqueza alélica - AR (Macuya = 11 e Iñapari = 8, máxima y mínima riqueza alélica respectivamente). El análisis de componentes principales muestra una fuerte sobreposición entre las poblaciones, que sumado a los reducidos valores de distancia genética interpoblacional (valores entre 0,066 a 0,1021), revelan una elevada semejanza genética entre ellas. El dendrograma elaborado en base a la distancia genética de Shared Allele, muestra que las poblaciones se encuentran conformando dos agrupaciones principales o clusters, la primera constituida...

The growing demand for Calycophyllum spruceanum is causing strong pressure on natural populations due to anthropogenic activities. For this reason, it is urgent to develop propagation technologies and production of plants for reforestation activities and establishment of forest plantations for their use and conservation. The objective of this study was to determine the effect of different substrates and containers on the emergence and growth of C. spruceanum. For this purpose, two experiments were conducted. In the first, four substrates were tested to evaluate seedling emergence, while in the second, the growth and quality of plants in different containers and substrates were determined. The maximum emergence values of 62.3%, emergency speed index (ESI) of 2.2, and mean emergence time of 29.9 were determined using a combination of carbonized rice husk (CRH), chicken manure, and decompos...

There is a high international demand for timber from the genus Dipteryx, or “shihuahuaco” as it is known in Peru. Developing tools that allow the identification and discrimination of Dipteryx species is therefore important for supporting management of natural populations and to underpin legal trade of its timber. The objective of this study was the molecular characterization of Dipteryx species in the Peruvian Amazonia. Two plastid regions (cpDNA: trnH–psbA and matK) were sequenced and 11 microsatellite markers (nDNA) were genotyped for 32 individuals identified as Dipteryx charapilla, D. micrantha morphotype 1 and D. micrantha morphotype 2. Using the concatenated sequences of the plastid genes, we identified ten haplotypes that were not shared between the species or between the D. micrantha morphotypes. Haplotypic diversity was greater in D. micrantha morphotype 2 and D. charapill...

Lentejas de agua: macrófitas acuáticas, hermosas, pero peligrosas. Capirona: versatilidad y rendimiento económico al voleo. El kion en los tiempos de pandemia. La preocupante disminución de las aves amazónicas y sus posibles consecuencias para el ser humano. Homo sapiens: ¿Un kamikaze hacia la sexta extinción? Micorrizas: un potencial maravilloso bajo nuestros pies. La entrevista: Dra. Katherine Roucoux profesora de la Universidad de Saint Andrews sobre las turberas tropicales. Gestión adecuada y sostenible del agua, responsabilidad de todos. La infografía: Terras pretas tecnología milenaria para el manejo del suelo. Un poco de Historia: Meggers vs Roosevelt: del determinismo ambiental a la subsistencia intensiva en la Amazonía.