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Competitive interaction between two aquatic hyphomycete species and increase in leaf litter breakdown

Treton, Catherine and Chauvet, Eric and Charcosset, Jean-Yves Competitive interaction between two aquatic hyphomycete species and increase in leaf litter breakdown. (2004) Microbial Ecology, vol. 48 (n° 3). pp. 439-446. ISSN 0095-3628

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Official URL: http://dx.doi.org/10.1007/s00248-003-0195-8

Abstract

Aquatic hyphomycete species produce large numbers of conidia which rapidly colonize the leaf litter that falls into rivers during autumn. Our objective was to understand how a species which produces many fewer conidia than another in laboratory conditions can nevertheless be codominant in a natural setting. In microcosm studies with two pioneer dominant species, Flagellospora curvula and Tetrachaetum elegans, inoculated on alder leaves, we first verified that the ratio of the conidium production of both species (6 to 7:1) was inverse to that of individual conidial masses (1:7) as previously described. Calculating the percentage of leaf mass loss that corresponds to 1 mg of conidial mass produced, the combination of the two species produced 2.9-fold more loss than the mean of each species. By contrast, the reproductive biomasses of F. curvula and T. elegans were 5.2- and 2.6-fold lower, respectively. As a result, the conidium production of F. curvula in the combination was only 3.2-fold that of T. elegans instead of 6- to 7-fold in pure culture. In a mixed culture of the two species, T. elegans conidia had a high germination potential (>90%) whereas the proportion of germinated F. curvula conidia was only 50%. Moreover, T. elegans reduced the area on which F. curvula could grow on poor and rich solid media. These results indicate that the dominance of F. curvula conidia in the river may be partly controlled by T. elegans and suggest that a negative interaction between microfungi may have a positive effect on the ecosystem functioning.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The original PDF of the article can be found at Thermochimica Acta website : http://link.springer.com/article/10.1007/s00248-003-0195-8#
HAL Id:hal-00965479
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Jean-Yves Charcosset
Deposited On:18 Mar 2014 12:18

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