Esporos e frutificações de fungos holocênicos de testemunho da lagoa da Ferradura (Armação dos Búzios, Rio de Janeiro, Brasil)

Abstract

-HOLOCENE FUNGAL SPORES AND FRUTIFICATIONS OF A CORE FROM THE FERRADURA LAGOON (ARMAÇÃO DOS BÚZIOS, RJ, BRASIL). Fungal spores and frutifications suggest environmental changes on Armação dos Búzios Peninsula (Lakes Region, Rio de Janeiro State, SE Brazil) before 7,880 years BP to current days. Holocene sediments of Ferradura Lagoon were processed by Quaternary palinological method, what made possible recovery abundant and diversified microfungi. In this study were identified 21 genera of fungal spores Deuteromycetes: Amerosporae (7), Didymosporae (4), Phragmosporae (6), Dictyosporae (1), Staurosporae (3); and one genus of frutification: Ascomycetes (Callimothallus). The identified genera were morphologically compared with modern living microfungi, which may reflect ecological interactions with certain groups of plants, such as Frasnacritetrus and grasses, Reduviasporonites/Aspergillus and Pteridophytes, and Dictyosporites/Arbuscula on Eugenia sp. (Myrtaceae) leaves, barks of some deciduous trees, and even some species of Rhamnaceae. The majority of the identified microfungi on RJ 92-5 core suggest a coastal environment with brackish waters from mangroves, moist soils and warm climate. These results agree with the Holocene paleoenvironmental characterization of eastern portion of Armação dos Búzios Peninsula based on pollen data.

Bryophyte and pteridophyte spores and other palynomorphs in quaternary marine sediments from Campos Basin, southeastern Brazil: Core BU-91-GL-05

“…Therefore, the identification and description of non-palynological palynomorphs (e.g. freshwater algae, microfungi, and pseudoschizaea) were carried out following Christopher (1976), Geel & Hammen (1978); Kalgutkar & Jansonius (2000); Freitas et al (2007); Freitas & Carvalho (2011). All the photographs were taken on a transmitted light Zeiss microscope under 400x and 1000x magnification, using Axiovision software 6.0 (Carl Zeiss, Oberkochen, Germany).…”

“…Are used to suggest humid conditions and a warm climate (Elsik 1996). Occurrence: recorded at Lagoa da Ferradura (Armação dos Búzios County, Rio de Janeiro) associated with aquatic vegetation of brackish soils, such as Typha, Ruppia, Cyperaceae, bryophytes, Botryococcus and marine palynomorphs (Freitas & Carvalho 2011). In coastal Holocene sediments from Santa Catarina State (Cancelli et al 2012), and a mangrove from Costa Rica, associated with Botryococcus and Spirogyra (Medeanic et al 2008).…”

“…Anacardium and Marantaceae) (Urben & Matos 1974). Occurrence: Holocene lacustrine sediments of coastal plain from Rio de Janeiro (Freitas & Carvalho 2011) and Santa Catarina states (Cancelli et al 2012), and Plio-Pleistocene sediments from Foz do Amazonas Basin (Carvalho 2003 Kalgutkar & Jansonius (2000). Ecological Data: a fungus spore characteristic of humid or drenched soils.…”

“…Core Record: E.F. coordinates V46/1, 1000x magnification, GL05/10 (20.07 m depth). References: Kalgutkar & Jansonius (2000) and Freitas & Carvalho (2011).…”

“…Even though palynological records from southern (Neves & Lorscheitter 1996;Behling 2002;Neves & Bauermann 2003;Medeanic 2006;Medeanic et al 2006;Scherer & Lorscheitter 2008;Cancelli et al 2012) and southeastern Brazil (Freitas 2005;2011;Luz et al 2006;2011;Toledo et al 2009;Freitas & Carvalho 2011; are far from complete, they provide a general picture that allows a better understanding of past vegetation and climate dynamics. They may also be used as a paleoenvironmental tool, especially for marine deposits (Lorscheitter & Romero 1985;Behling et al 2002;Freitas 2005;Freitas et al 2007;.…”