Flowering phenology and its implications for management of big-leaf mahogany Swietenia macrophylla in Brazilian Amazonia

Indigenous and traditional knowledge, sustainable harvest, and the long road ahead to reach the 2020 Global Strategy for Plant Conservation objectives

Abstract Global strategies under the scope of CBD are important in guiding policies and resources for the conservation of biological diversity. This paper emphasized the need to develop actions under the Global Strategy for Plant Conservation (GSPC) with measurable results up to 2020, regarding the status and perspectives related to Targets 12 and 13, focusing on the Brazilian context in order to identify gaps and actions to achieve the goals for conservation and sustainable use of plants. It should be noted that Target 12 also covers logging, not necessarily directly related to indigenous peoples and traditional communities, but may threaten their livelihoods. In Brazil, scientific knowledge about the ecological effects of the harvesting of non-timber forest products is still limited, and few studies have contributed to the establishment of legal regulations for collection and management. With regard to target 13, which concerns traditional and indigenous knowledge about plant use and the dependence of these peoples on plants, there are still a lack of integrative and effective policy initiatives. However, considering the negative political context of recent decades and exacerbated in recent years in relation to biodiversity conservation and indigenous peoples and local communities, profound changes are necessary in the Brazilian scenario, with strong support and recognition for indigenous peoples and local communities, so that any objective related to the achievement of the goals of the GSPC is minimally achieved.

Reproductive ecology of Ocotea catharinensis, an endangered tree species

Ocotea catharinensis (Lauraceae) is an endangered tree species from the Brazilian Atlantic Rainforest. Currently, little is known about the reproductive ecology of this species. Aiming to propose conservation measures, we described aspects related to phenology, floral biology, pollination, seed dispersal and mating system of O. catharinensis. We conducted phenological observations in 62 individuals for 2 years. In one reproductive event, we evaluated nectar production, stigmatic receptivity and pollen viability. Floral visitors were observed, identified and classified on a scale of pollination effectiveness. Seed dispersers were observed and identified using camera traps. Finally, the mating system was evaluated through pollen/ovule ratios, experimental pollination treatments and genetic analysis with molecular markers. Ocotea catharinensis presented a supra-annual fruiting pattern with a substantial reduction of reproducing individuals from bud phase to ripe fruit phase. Several mechanisms prompting cross-fertilisation were identified, such as attractive, herkogamic and protogynic flowers. The main floral visitors and pollinators were from the Diptera order, and all seed dispersers were birds. The species presented a predominantly outcrossed mixed mating system with significant selfing rate (17.3%). Although based on restricted evidence, we hypothesised that selfing is an escape mechanism for situations unfavourable to cross-fertilisation. Specifically, for the studied population selfing is a response to reduced population size, which is caused by the non-reproduction of all potentially reproductive individuals and by past exploitation events. Therefore, conservation efforts should be able to enhance population sizes, as well as prevent overexploitation.