Abundance of biofilm on intertidal rocky shores: Can trampling by humans be a negative influence?

Abundance of biofilm on intertidal rocky shores: Can trampling by humans be a negative influence?

Author Leite, Lucas G. Google Scholar
Ciotti, Aurea M. Google Scholar
Christofoletti, Ronaldo Adriano Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract Trampling by human visitors to rocky shores is a known stressor on macroorganisms. However, the effects of trampling on rocky intertidal biofilm, a complex association of microorganisms of ecological importance in coastal communities, have not been quantified. We evaluated the impact of trampling frequency and intensity on total biomass of epilithic microalgae on intertidal rocky shores in the southeast of Brazil. There was a trend of increase in the variability of biomass of biofilm in function of intensity of trampling, but no significant effects emerged among trampling treatments. the low influence of trampling on biofilm might be a result of the small dimensions of the organisms coupled with their natural resilience and roughness of the substrate; the former preventing the removal of biofilm layers by shoes and facilitating their quick recovery. Our results provide insights for management and conservation of coastal ecosystems revealing a weaker impact of trampling on biofilm than that reported on macroorganisms. (C) 2012 Elsevier B.V. All rights reserved.
Keywords Benthic ecology
Coastal ecosystem
Marine communities
Rocky shore
Spacial scale
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number FAPESP: 06/00559-4
Date 2012-08-01
Published in Marine Environmental Research. Oxford: Elsevier B.V., v. 79, p. 111-115, 2012.
ISSN 0141-1136 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 111-115
Origin http://dx.doi.org/10.1016/j.marenvres.2012.06.001
Access rights Closed access
Type Article
Web of Science ID WOS:000307094000012
URI http://repositorio.unifesp.br/handle/11600/35137

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