| Aquatic hyphomycete strains from metal contaminated and reference streams might respond differently to future increase in temperature. | |
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MedLine Citation:
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PMID: 22123653 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Aquatic hyphomycetes, a group of polyphyletic fungi, have been reported in streams contaminated with metals. This tolerance to metal contamination can, however, be at the cost of limited performance and limited ability to cope with additional environmental change. The predicted increase in water temperature, as a consequence of global warming, will be an additional impact to many streams. The sensitivity to temperature of strains of three aquatic hyphomycete species isolated from a metal contaminated and an uncontaminated stream was assessed by determining their radial growth and activity (conidial production, oxygen consumption, mycelial biomass accumulation, fine particulate organic matter (FPOM) production, and microbial induced leaf mass loss) at 13 C (present water temperature in autumn) and at 18 C (predicted water temperature in a global warming scenario). Growth and reproductive activity were generally depressed for the strains isolated from the metal contaminated stream when compared with those isolated from the unpolluted stream. These differences were, however, not translated into differences in FPOM production and leaf litter mass loss, indicating that the strains isolated from the metal contaminated stream have capabilities to decompose leaf litter similar to those of the reference stream. The 5 C increase in temperature stimulated fungal activity and litter decomposition, irrespective of species and strain. This might have strong impacts on aquatic food web and ecosystem functioning in a global warming scenario, as increases in litter decomposition might lead to food shortage for higher trophic levels. The sensitivity to temperature depended on the response variable, species and strain. FPOM production was the variable most sensitive to temperature across strains and species and that for which temperature sensitivities differed most between strains. Fungal tolerance to metal contamination affects the extent to which its functions are stimulated by an increase in temperature, constituting an additional cost of metal tolerance. |
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Authors:
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Verónica Ferreira; Ana Lúcia Gonçalves; Cristina Canhoto |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-28 |
Journal Detail:
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Title: Mycologia Volume: - ISSN: 0027-5514 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-11-29 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0400764 Medline TA: Mycologia Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Depto. Zoologia, Universidade de Coimbra, IMAR-CMA, Dept. Life Sciences, University of Coimbra, Largo Marquês de Pombal, Coimbra, Coimbra, 3001-401, Portugal. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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