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Effects of irradiance and spectral composition on the establishment of macroalgae in streams in southern Brazil

Published online by Cambridge University Press:  29 October 2012

Aurélio Fajar Tonetto ,
Ciro Cesar Zanini Branco  and
Cleto Kaveski Peres
Aurélio Fajar Tonetto
Affiliation:
Laboratory of Aquatic Biology, Department of Biological Sciences, São Paulo State University, UNESP, Av. Dom Antônio, 2100, 19806-900, Assis, SP, Brazil
Ciro Cesar Zanini Branco*
Affiliation:
Laboratory of Aquatic Biology, Department of Biological Sciences, São Paulo State University, UNESP, Av. Dom Antônio, 2100, 19806-900, Assis, SP, Brazil
Cleto Kaveski Peres
Affiliation:
Federal University of Latin American Integration, UNILA, Av. Tancredo Neves, 6731, Itaipu Technological Park 85867-970, Foz do Iguaçu, PR, Brazil
*
*Corresponding author: czbranco@assis.unesp.br
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Abstract

The relative effects of irradiance and spectral composition on the colonization and development of macroalgal communities were examined in four streams exposed to full sunlight in southern Brazil. A set of solar filters surrounded the artificial substrata to provide various quantitative and qualitative light conditions. In addition to the control, the conditions were full sunlight attenuated by 50, 70 and 90%, blue light (filter transmitting 430–500 nm), green light (500–600 nm) and red light (>600 nm). Macroalgal percent cover was determined three times during the colonization period (15, 39 and 70 days). Significant differences occurred in the mean values for macroalgal community percent cover between treatments at 15 and 39 days, suggesting that early and intermediate stages of the colonization were directly influenced by irradiance. There was an almost complete absence of macroalgae with 90% attentuation, but progressive increases with 70 and 50% attenuation. However, the mean values for macroalgal community percent cover did not differ significantly between color treatments, suggesting that the effects of irradiance on macroalgal colonization were stronger than those of spectral composition at similar intensity. The quantitative responses differed among the taxa.

Keywords

Irradiancelight availabilitylotic systemspectral compositionstream macroalgae
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 48 , Issue 4 , 2012 , pp. 363 - 370
Copyright
© EDP Sciences, 2012

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