Análise morfológica e inferências ecológicas de grãos de pólen e esporos (últimos ~8.000 anos) da Lagoa da Ferradura, Armação dos Búzios, RJ, Brasil

Abstract

This work presents descriptions of spores and pollen grains taken from a Holocene sediment core (22°48′45″S, 41°54′13″W) collected in the Ferradura Lagoon, Armação dos Búzios peninsula, Rio de Janeiro State, Brazil, during the last 8,060-7,770 14C cal. years BP. The chemical treatment of the sediments and palynological analyses made possible to identify, based on morphological criteria, 119 pollinic types. These types corresponded two families and two genera of bryophyte, six families and seven genera of pteridophyte, one genus of gymnosperm pollen (Podocarpus) and 107 types of angiosperms pollen that consisted of seven families and five genus of monocotyledoneae and 47 families and 66 genus of dicotyledoneae. The most common angiosperm types were: Fabaceae (20), Euphorbiaceae (7), Anacardiaceae (5), Malvaceae (5), Bignoniaceae (4), Sapindaceae (3), and Amaranthaceae (3). The most abundant taxa were: Actinostemon, Allagoptera, Anacardiaceae, Asteraceae, Azolla, Chenopodium, Cyathea, Euphorbiaceae, Myrtaceae, Poaceae, Schinus, Trema, cf. Trichilia and Typha. The palynoflora in this study are associated to restinga and semideciduous forests, demonstrating the potential of this material to provide environmental information relevant to paleoenvironmental reconstruction of the study area. © 2012 by the Sociedade Brasileira de Paleontologia.