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Allelopathic inhibition of primary producer growth and photosynthesis by aquatic fungi

Allen, Joey and Leflaive, Joséphine and Bringuier, Charlotte and Ten-Hage, Loïc and Chauvet, Eric and Cornut, Julien and Danger, Michael Allelopathic inhibition of primary producer growth and photosynthesis by aquatic fungi. (2017) Fungal Ecology, 29. 133-138. ISSN 1754-5048

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.funeco.2017.07.001


Autochthonous primary production is generally much reduced in forested headwater streams. Several hypotheses have been proposed for explaining this observation, among them, the low light intensity, or the strong constraints exerted by stream current. Allelopathic inhibition of competitors is a common ecological process in aquatic environments. Aquatic hyphomycetes are known to chemically inhibit bacteria and other fungi (including other aquatic hyphomycetes) but a possible allelopathic effect of aquatic hyphomycetes on primary producers has never been tested. The inhibitory effect of twelve aquatic hyphomycete species was tested on three diatom species. Nine aquatic hyphomycete species exhibited anti-diatom activity. Up to 100% diatom growth inhibition was observed. Our study reveals that such allelopathic interactions might be common in streams and probably involve an array of fungal compounds. We propose that the generally reduced primary production observed in forested headwater streams is, among other factors, due to the inhibition of primary producers by allelopathic compounds released by aquatic hyphomycetes.

Item Type:Article
HAL Id:hal-01878127
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Universidade de Coimbra (PORTUGAL)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Lorraine (FRANCE)
Laboratory name:
Deposited On:20 Sep 2018 14:42

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