Journal
ENVIRONMENTAL POLLUTION
Volume 202, Issue -, Pages 32-40Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2015.03.014
Keywords
Fungi; Invertebrates; Periphyton; Streams; Subsidy-stress model
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Funding
- European Regional Development Fund - Operational Competitiveness Programme (FEDER-POFC-COMPETE)
- Portuguese Foundation for Science and Technology [PEst-OE/BIA/UI4050/2014, PTDC/AAC-AMB/117068/2010]
- Coordination for the Improvement of Higher Education Personnel (CAPES) [16506/12-0]
- Fundação para a Ciência e a Tecnologia [PTDC/AAC-AMB/117068/2010] Funding Source: FCT
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We assessed the eutrophication effects on leaf litter decomposition and primary production, and on periphytic algae, fungi and invertebrates. According to the subsidy-stress model, we expected that when algae and decomposers were nutrient limited, their activity and diversity would increase at moderate levels of nutrient enrichment, but decrease at high levels of nutrients, because eutrophication would lead to the presence of other stressors and overwhelm the subsidy effect. Chestnut leaves (Castanea sativa Mill) were enclosed in mesh bags and immersed in five streams of the Ave River basin (northwest Portugal) to assess leaf decomposition and colonization by invertebrates and fungi. In parallel, polyethylene slides were attached to the mesh bags to allow colonization by algae and to assess primary production. Communities of periphytic algae and decomposers discriminated the streams according to the trophic state. Primary production decomposition and biodiversity were lower in streams at both ends of the trophic gradient. (C) 2015 Elsevier Ltd. All rights reserved.
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