Abstract Birds are the best-known vertebrate group, although many localities in the world are considered to be knowledge gaps. This is the case of many little-known environments in the Amazon biome, the world’s largest tropical forest. Here, we present a survey of birds in the upper Purus basin, comprising the municipalities of Manoel Urbano and Feijó in the Brazilian state of Acre, and Boca do Acre and Pauini in the state of Amazonas. In this region, poorly-studied habitats, such as open rainforest dominated by palms or bamboo, still predominate. We recorded 452 bird species during 45 field trips between May and July in 2016, and June to August in 2017. Twenty-four of these species are associated with bamboo habitat, 28 are endemic to the southwestern Amazon basin, and seven are threatened with extinction. This high diversity is typical of the western Amazon basin, one of the richest regions in the world in the number of species, due to the heterogeneity of the local environments. The data presented here highlight the importance of the region for the conservation of birds, including species typical of the western Amazon, some of which are still poorly-known.

Abstract Amaranth is a crop adapted to arid and semi-arid agroclimatic conditions. Its grain yield can be increased with fertigation, but there is limited information on growth parameters and crop yield under this system. The objective of this work was to characterize growth, accumulation and distribution of biomass of two varieties of amaranth (Frondosa and Dorada) with fertigation. The experimental phase was carried out is Salinas, San Luís Potosí, at a density of 25 plants per m2. Organomineral fertilization was applied to soil, and chemical fertilization through irrigation, whose total water sheet was 321 mm. Frondosa compared to Dorada, reached faster maturity and presented higher values of: leaves number, panicle length and dry biomass, as well as harvest index (gain/total dry biomaas). Thermal requirement was 910.7 °C and 968.6 ºC for Frondosa and Dorada, respectively. Frondosa had higher water use efficiency (WUE) (7.1 kg mm-1) in grain production (2.3 t ha-1), but WUE for fresh biomass (69.6 t ha-1) was higher in Dorada (216.6 kg mm-1). Environmental conditions in Altiplano Potosino are favorable to produce amaranth with high yield (grain or forage) under fertigation.

Resumen El cultivo de amaranto se adapta a condiciones agroclimáticas de regiones áridas y semiáridas. Su rendimiento de grano puede incrementarse con fertirriego, pero es necesario generar más información sobre parámetros de crecimiento y rendimiento del cultivo bajo este sistema. El objetivo fue caracterizar el crecimiento, acumulación y distribución de materia seca de dos variedades de amaranto (Frondosa y Dorada) bajo fertigación. La fase de campo se realizó en Salinas, San Luis Potosí, con una densidad de 25 plantas por m2. Se aplicó fertilizante organomineral al suelo y nutrición química en el agua de riego, cuya lámina total fue 321 mm. Frondosa, respecto a la Dorada, llegó más rápido a madurez y mostró valores mayores en: número de hojas; longitud y biomasa seca de panoja; e índice de cosecha (grano/biomasa total). El requerimiento térmico total fue de 910.7 °C y 968.6 ºC para Frondosa y Dorada, respectivamente. Frondosa tuvo mayor eficiencia en el uso del agua (EUA) (7.1 kg mm-1) en grano (2.3 t ha-1), pero la EUA para biomasa fresca (69.6 t ha-1) fue mayor en Dorada (216.6 kg mm-1). Las condiciones ambientales del Altiplano Potosino son favorables para producir Amaranto con alto rendimiento de grano o forraje con fertigación.