Expressões fenológicas de palmeiras em coleções botânicas associadas às condições pluviais na floresta tapajós

The Arecaceae family belongs to the Amazon biome’s hyper dominances, many species being of interest for local populations. This work aimed at assessing palm trees herborized phenological records, associated with rainfall in the Tapajos National Forest and surroundings. Data from the herbaria of Embrapa Eastern Amazon (IAN / EMBRAPA) and Goeldi Museum (MPEG) were recorded to assess Arecaceae phenological information. We assessed the available rainfall data from Belterra, Santarem and Ruropolis. Rainfall data were recorded and assessed based on flowering and/or fruiting dates, as described in the herbaria records. We also assessed the rainfall total in the previous two months, as an indicator of water volume in palm trees occurrence areas. We identified 34 species with predominance of Bactris, Geonoma and Oenocarpus genera, Oenocarpus bataua Mart. (pataua) showing the highest frequency in the records. Flowering and/or fruiting prevailed in November. In the less rainy trimester (August-October) rainfall was less than 50 mm, indicating that the phenological expression in the opening month of erratic rain period in the region is a perpetuation strategy from the analyzed species. We concluded that, in herborized botanical materials, it is possible to assess responses to climatic conditions in the Amazon.