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title Effects of cadmium and resource quality on freshwater detritus processing chains: a microcosm approach with two insect species
authors Campos, D; Alves, A; Lemos, MFL; Correia, A; Soares, AMVM; Pestana, JLT
author full name Campos, Diana; Alves, Artur; Lemos, Marco F. L.; Correia, Antonio; Soares, Amadeu M. V. M.; Pestana, Joao L. T.
title Effects of cadmium and resource quality on freshwater detritus processing chains: a microcosm approach with two insect species
nationality internacional
language English
document type Article
author keywords Shredder-collector interactions; Facilitation; Indirect effects; Leaf decomposition; Chironomus
abstract Detritus processing is vital for freshwater ecosystems that depend on the leaf litter from riparian vegetation and is mediated by microorganisms and aquatic invertebrates. Shredder invertebrates transform coarse particulate organic matter into fine particulate organic matter used as food by collector species. Direct and indirect effects of contaminants can impair detritus processing and thus affect the functioning of these ecosystems. Here, we assessed the combined effects of a toxic metal (cadmium) and resource quality (leaf species) on detritus processing and shredder-collector interactions. We considered two types of leaves, alder and eucalyptus that were microbially conditioned under different Cd concentrations in the laboratory. The microbial communities present on leaves were analyzed by Denaturing Gradient Gel Electrophoresis (DGGE), and we also measured microbial respiration rates. Sericostoma vittatum (a caddisfly shredder) and Chironomus riparius (a midge collector) were also exposed to Cd and allowed to consume the corresponding alder or eucalyptus leaves. We evaluated C. riparius growth and leaf mass loss in multispecies microcosms. Cadmium exposure affected leaf conditioning and fungal diversity on both leaf species, as assessed by DGGE. Cadmium exposure also affected the mass loss of alder leaves by reductions in detritivore feeding, and impaired C. riparius growth. Chironomus riparius consumed alder leaf discs in the absence of shredders, but S. vittatum appear to promote C. riparius growth in treatments containing eucalyptus. These results show that indirect effects of contaminants along detritus-processing chains can occur through effects on shredder-collector interactions such as facilitation but they also depend on the nutritional quality of detritus and on sensitivity and feeding plasticity of detritivore species.
author address [Campos, Diana; Alves, Artur; Lemos, Marco F. L.; Correia, Antonio; Soares, Amadeu M. V. M.; Pestana, Joao L. T.] Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal; [Campos, Diana; Alves, Artur; Lemos, Marco F. L.; Correia, Antonio; Soares, Amadeu M. V. M.; Pestana, Joao L. T.] Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal; [Lemos, Marco F. L.] Inst Politecn Leiria, ESTM, P-2520641 Peniche, Portugal; [Lemos, Marco F. L.] Inst Politecn Leiria, GIRM, P-2520641 Peniche, Portugal; [Soares, Amadeu M. V. M.] Univ Fed Tocantins, Programa Posgrad Prod Vegetal, BR-77402970 Gurupi, To Cep, Brazil
reprint address Pestana, JLT (reprint author), Univ Aveiro, Dept Biol, Campus Santiago, P-3810193 Aveiro, Portugal.
e-mail address jpestana@ua.pt
researcherid number Alves, Artur/C-3645-2008
orcid number Alves, Artur/0000-0003-0117-2958
funding text We are grateful to two anonymous reviewers for their comments and suggestions that greatly improved this manuscript. Financial support for this work was provided by the projects
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publisher SPRINGER
publisher city DORDRECHT
issn 0963-9292
29-character source abbreviation ECOTOXICOLOGY
iso source abbreviation Ecotoxicology
publication date JUL
year published 2014
volume 23
issue 5
beginning page 830
ending page 839
digital object identifier (doi) 10.1007/s10646-014-1223-9
page count 10
web of science category Ecology; Environmental Sciences; Toxicology
subject category Environmental Sciences & Ecology; Toxicology
document delivery number AI8GN
unique article identifier WOS:000337148800008
link http://dx.doi.org/10.1007/s10646-014-1223-9