Data/hora: 10/06/2024 18:07:21

Provedor de dados: 	20	
País: 	Belgium	
Título: 	Evaluación de la tasa fotosintética del alga verde Rhizoclonium riparium (Roth) Kützing ex Harvey, expuesta a cobre y su uso como indicador de contaminación por metales en aguas estuarinas	
Autores: 	Montoya, W.; Peña, E.J.; Benítez, R.	
Data: 	2008-04-02	
Ano: 	2006	
Palavras-chave: 	Heavy metals; Biological stress; Algae; Indicator species; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Heavy metals; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Algae; Indicator species; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6077; Http://aims.fao.org/aos/agrovoc/c_32389; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_35790.	
Resumo: 	Algae have been used as bioindicators by having several advantages such as they have short life cycles, they can take up nutrients directly from water, they are generally easy to collect in sufficient amounts from various habitats; and they readily accumulate compounds present in seawater, making tissue analyses reliable indicators of water quality. In order to evaluate the bioremoval capability of the green alga Rhizoclonium riparium, the photosynthetic responses to heavy metal pollution under different sublethal concentrations of copper was assessed. Photosynthetic rates were significantly low (p &lt;0.05) at low copper concentrations, between (0.01 y 10 mg/l). Maximum photosynthetic values were shown at 30 y 60 mg/l and almost cero at 150 mg/ l of Cu. During the first 24 hours of exposure there was a significant reduction (p &lt;0.05) of photosynthesis in all studied concentrations, whereas between 24 and 96 exposure times, rates increased significantly. These preliminary results suggested that plants exhibited an “alarm phase” related with diffusion processes and metal ions exchange at the cell wall. The photosynthesis behaviour along the gradient concentration indicated the resistance and tolerance capacity of the alga as well as its potential use for copper removal in coastal waters.	
Tipo: 	Conference Material	
Idioma: 	Espanhol	
Identificador: 	Taller Internacional Contaminacion y Proteccion del Medio Ambiente, IV, Ciudad de La Habana.

http://hdl.handle.net/1834/2256