%0 Journal Article
%T Periphytic algal biomass in two distinct regions of a tropical coastal lake Biomassa de algas perif赤ticas em duas regi es distintas de uma lagoa costeira tropical
%A St谷fano Zorzal de Almeida
%A Val谷ria de Oliveira Fernandes
%J Acta Limnologica Brasiliensia
%D 2012
%I 
%X AIM: This study assessed the phycoperiphyton biomass in two regions submitted to different human impacts on Juara Lake, a coastal ecosystem with multiple uses, to order to test the hypothesis that the sampling sites that receive domestic sewage shows higher biomass values. METHODS: It was installed three experimental structures with artificial substrate (glass slides) in December 2009 in two sampling sites: ED - near the domestic sewage's release; TR - in the area of intensive fish farming (net cages). Samplings were conducted in each experimental structure, after 21, 26 and 31 days for colonization. We evaluated: transparency, electric conductivity, pH, turbidity, total suspended solids, alkalinity, dissolved oxygen, water temperature, total nitrogen, nitrate, nitrite, ammonia nitrogen, total phosphorus, orthophosphate and silicate. The phycoperiphyton was analyzed regarding biomass: biovolume (total and per class); pigments (chlorophyll-a and b and carotenoids) and phaeophytin; dry weight and ash-free dry weight. RESULTS: TR featured higher values of transparency, water temperature and silicate. ED presented greater values of conductivity, turbidity, total suspended solids, alkalinity, total nitrogen, nitrate, ammonia nitrogen, and orthophosphate. No difference was detected between the sites and the succession of days for the dry weight, ash-free dry weight, chlorophyll-b, carotenoids, phaeopigments, and total biovolume. CONCLUSIONS: Nevertheless, the biovolume of Bacillariophyceae and Chlorophyceae were more representative in ED. Only the higher values of chlorophyll confirmed the hypothesis tested. OBJETIVO: A presente pesquisa visou avaliar a biomassa ficoperif赤tica em duas regi es submetidas a diferentes impactos antr車picos na lagoa Juara, ecossistema costeiro com m迆ltiplos usos, a fim de testar a hip車tese de que a regi o pr車xima ao lan amento de esgoto apresenta maior biomassa. M谷TODOS: Tr那s estruturas experimentais contendo substratos artificiais (lamina de vidro) foram implantadas em dez/2009 em duas esta  es amostrais: ED - pr車xima ao lan amento de efluentes dom谷sticos; TR - na 芍rea de piscicultura intensiva (tanques-rede). Foram realizadas coletas, em cada estrutura experimental, ap車s 21, 26 e 31 dias de coloniza  o. Foram avaliadas: transpar那ncia, condutividade el谷trica, pH, turbidez, s車lidos totais em suspens o, alcalinidade, oxig那nio dissolvido, temperatura da 芍gua, nitrog那nio total, nitrato, nitrito, nitrog那nio amoniacal, f車sforo total, ortofosfato e silicato. Tr那s estruturas experimentais contendo substratos artificiais (lamina de vidro)
%K efluente dom谷stico
%K piscicultura intensiva
%K biovolume
%K pigmentos
%K peso seco
%K domestic effluent
%K intensive fish farming
%K biovolume
%K pigments
%K dry weight
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2012000300003