Luz Cynthia F P da, Barth Ortrud M, Silva Cleverson G
Instituto de Botânica, Núcleo de Pesquisa em Palinologia, São Paulo, SP, Brazil.
An Acad Bras Cienc. 2010 Sep;82(3):679-90. doi: 10.1590/s0001-37652010000300016.
Palynological analysis of pollen, Pteridophyta spores and algae deposited in the superficial sediments at Lagoa de Cima and Lagoa do Campelo Lakes, located in the north of Rio de Janeiro state, was used to determine the spatial variation of the palynomorphs deposition. A total of 67 pollen types were identified at Lagoa de Cima, with an expressive contribution of regional arboreous taxa, hydrophytes and ruderal plants of the pastureland. The depositional pattern of palynomorphs depends on the fluvial leakage, the proximity of the local sedimentation to the inlet of the Imbé and Urubu Rivers and the bathymetry of lake bottom. The highest concentrations of palynomorphs were observed in the decentralized and less deeper area, without the interference of the northeastern wind. At Lagoa do Campelo, a total of 58 pollen types were identified, among which the majority of the pollen grains came from hydrophytes, with the highest concentrations found along the northeastern shore. The southeastern shore showed high percentages of pollen and spores with degraded exine and mechanical damage, due to the transport through the lake by the currents caused by the wind, confirmed by the depositional trend of damaged palinomorphs along the same direction as the prevailing winds.
对里约热内卢州北部拉戈阿迪西马湖和坎佩洛湖表层沉积物中沉积的花粉、蕨类植物孢子和藻类进行孢粉学分析，以确定孢粉形态沉积物的空间变化。在拉戈阿迪西马湖共鉴定出67种花粉类型，区域树木类群、水生植物和牧场杂草植物的贡献显著。孢粉形态的沉积模式取决于河流渗漏、当地沉积物与因贝河和乌鲁布河河口的距离以及湖底的水深测量。在没有东北风干扰的分散且较浅的区域观察到孢粉形态的最高浓度。在坎佩洛湖，共鉴定出58种花粉类型，其中大多数花粉粒来自水生植物，在东北岸发现了最高浓度。东南岸显示出高比例的花粉和孢子，其外壁有降解和机械损伤，这是由于风引起的水流在湖中运输所致，受损孢粉形态沿盛行风方向的沉积趋势证实了这一点。
