Open AccessAnálise da composição cianobacteriana das esteiras pustulares em salina, Araruama, Rio de Janeiro
Author(s) -
Loreine Hermida da Silva e Silva,
Fabiane Feder,
Deise de Oliveira Delfino,
Frederico Alves dos Santos Lopes
Publication year - 2007
Publication title -
anuário do instituto de geociências
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.202
H-Index - 12
eISSN - 1982-3908
pISSN - 0101-9759
DOI - 10.11137/2007_1_175-180
Subject(s) - saline water , algae , precipitation , evaporation , hydrology (agriculture) , latitude , environmental science , geology , mineralogy , geography , salinity , biology , botany , oceanography , geotechnical engineering , meteorology , geodesy
Julieta saline receives water from lagoa de Araruama, which is located in the state of Rio de Janeiro, to the East of the city of Araruama and to the west of the city of Cabo Frio, between 22º49' and 22º57' S latitude and 42º00' and 42º23' W longitude. It is composed by a series of soil tanks obtained by natural excavation, where water gradually concentrates through natural evaporation until salt precipitation. The reservoirs can be divided in three types, according to their activity: cargo, evaporator and crystallizer tanks. The process of making such reservoirs waterproof is enabled by a fine layer of algae which is formed naturally with the passing of time. This study is based on monthly collects within the period ranging from May, 2004 to October, 2004, along three collection stations set up in different saline reservoirs. To identify the microbic composition, fresh, semi-permanent and permanent laminae were obtained and their analysis were performed by means of optical microscopy. The analysis revealed a total of twenty cyanobacterial types. In all layers, a predominant amount of oval spherical forms was observed. The predominance of cyanobacteria is justified by the fact that they are carriers of high morphological adaptations which enables them to survive in various types of environments and be predominant in hypersaline sites.