Linked Life Data

19411090

Source:http://linkedlifedata.com/resource/pubmed/id/19411090

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
14
pubmed:dateCreated
2009-5-26
pubmed:abstractText
To better understand the impacts of multiple stressors in freshwaters, we investigated the effects of mixtures of zinc and inorganic phosphorus on microbial decomposition of leaf litter. Alder leaves were colonized in a stream and placed in microcosms with stream water supplemented or not with 3 concentrations of zinc (Zn up to 9.8 mg/l) or phosphate (P-PO(4)(3-) up to 0.5 mg/l), alone and in all possible combinations. We measured leaf mass loss, and fungal biomass, reproduction and diversity. In control microcosms, 23 species of aquatic hyphomycetes were identified on leaves, and the exposure to the highest zinc concentration reduced diversity to 14 species. Articulosporatetracladia was the dominant species followed by Flagellospora sp. and Alatosporaacuminata. The exposure to phosphate increased the contribution of A.acuminata, but this species was negatively affected by zinc. Under high zinc stress, Varicosporiumelodeae increased its contribution to the total conidial production. The exposure to high zinc concentration, alone or in mixtures with phosphate, led to shifts in fungal community structure, as indicated by cluster analysis based on sporulation data and denaturing gradient gel electrophoresis (DGGE) fingerprints of fungal DNA. These changes were accompanied by a reduction in leaf decomposition, particularly in mixtures with high Zn concentration, in which leaf mass loss was 30% lower than in the control. This suggests that the co-occurrence of zinc and phosphate may have negative effects on stream ecosystem functioning. However, we did not detect decreased leaf-associated fungal biomass and sporulation, probably because a delay in fungal colonization occurred due to the presence of stressors.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
1879-1026
pubmed:author
pubmed:issnType
Electronic
pubmed:day
1
pubmed:volume
407
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4283-8
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Mixtures of zinc and phosphate affect leaf litter decomposition by aquatic fungi in streams.
pubmed:affiliation
Centre of Molecular and Environmental Biology, Department of Biology, University of Minho, Campus de Gualtar, Braga, Portugal.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't