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Airborne palynomorphs on Trindade Island, South Atlantic Ocean, Brazil

2018; Springer Science+Business Media; Volume: 41; Issue: 2 Linguagem: Inglês

10.1007/s40415-018-0460-1

1806-9959

Ruy José Válka Alves, Maria Luísa Lorscheitter, Claudia de Moraes Rezende, Nílber Gonçalves da Silva,

Polar Research and Ecology

The dispersion of palynomorphs in the atmosphere by wind plays an important role in the distribution of plant species and in gene exchanges among populations established on oceanic islands. In this study, we evaluated uninterrupted palynomorph rain for 19 months on Trindade Island (20°30′27″S–29°19′48″W) in the South Atlantic Ocean off the coast of Brazil. The objective of the study was to assess, using Tauber-type samplers, the atmospheric palynomorph population on the island and distinguish species of local origin from those transported long distances. The expedition was transported to the island by the Brazilian Navy. Samples were subjected to acetolysis followed by analysis in light microscopy. Palynological and accumulation rate diagrams are presented. A total palynomorphs of 11 pteridophytes, 9 angiosperms, 3 fungi, and remains of various animals are described and illustrated. After each description, a brief comment on the frequency and possible origin of the palynomorph is presented. The composition of palynomorph rain reflects the organisms extant on Trindade Island, together with material transported over long distances by atmospheric circulation.