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Macaws and Brazil Nuts
I was happy to read the most recent publication explaining variation in Brazil nut fruit production, which does not blame macaws and parrots for predation. Although a previous publication states that up to 10% of a crop can be lost due to predation by macaws on young fruit, the latest modelling states that production is more influenced by lianas and Phosphorus. Results suggest that fruit productivity at the individual tree level could be increased, possibly through experimental liana cutting and/or P amendments. At the population level, Brazil nut collectors could potentially increase efficiency by concentrating collection efforts on consistently high producers and possible production ‘‘hotspots’’.
Reference: Karen A. Kainer, Lucia H.O. Wadt, Christina L. Staudhammer (2007) Explaining variation in Brazil nut fruit production. Forest Ecology and Management 250: 244–255
