Pollen dispersal distance of Brazilian native tree species: a systematic review

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Knowledge of the pollen dispersal distance (PDD) is crucial for delimitating the collection radius of subpopulations in seed collection areas used as germplasm sources for genetic breeding, conservation, and restoration projects. Some studies have reported the PDD of trees, but these are scattered throughout the literature. Therefore, the objective of this study was to systematically review and report as many PDDs as possible found in the literature on native Brazilian tree species. In the present study, we identified the most and least studied species, temporal trends in publications, geographic distribution of studies, mating systems, and pollinator types for each species. A systematic review protocol was established, and the search criteria were improved, resulting in 543 articles. Forty-four articles contained information on native species, and 319 PDD from 41 tree species were extracted. The most investigated species for pollen dispersal were Cariniana estrellensis (Raddi) Kuntze (Jequitibá-branco) and Araucaria angustifolia (Bertol.) Kuntze (Araucária). The PDD values ranged from 9 m to 5229 m, averaging 543.9273 m. The five species with the highest average PDDs were Centrolobium tomentosum Guill. ex Benth. (Araribá), Swietenia macrophylla King (Mogno-brasileiro), Hymenaea courbaril L. (Jatobá), Dipteryx alata Vogel (Baru) and Hymenaea stigonocarpa Mart. Ex-Hayne (Jatobá do Cerrado) at 3191 m, 1472 m, 1450 m, 1215.12 m, and 1086.81 m, respectively. Theobroma cacao L. and Ilex paraguariensis A.St.-Hil. had the shortest PDDs averages at 28 m and 15.9 m, respectively. This work provides a valuable PDD database that will expand the possibilities for new research and guide projects related to seed collection, forest restoration, germplasm conservation, and genetic breeding of native Brazilian trees.