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Aquatic hyphomycetes and litter decomposition in tropical – subtropical low order streams

Graça, Manuel A. S. and Hyde, Kevin and Chauvet, Eric Aquatic hyphomycetes and litter decomposition in tropical – subtropical low order streams. (2016) Fungal Ecology, vol. 19. pp. 182-189. ISSN 1754-5048

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Official URL: http://dx.doi.org/10.1016/j.funeco.2015.08.001

Abstract

Leaf litter decomposition is an important ecosystem function carried out by a diverse array of consumers, including aquatic hyphomycetes. Aquatic hyphomycetes are found in streams worldwide, but their diversity and abundance varies across systems. In general, species diversity is lower across tropical and subtropical systems when compared with temperate biomes. The low diversity in tropical and subtropical areas may be related to: (a) lower seasonality; (b) our inability to detect fungi by traditional techniques; (c) low tur- bulence of rivers where many studies were carried out; (d) low nutrient content in many studied tropical systems; (e) leaves highly defended against consumers; and (f) competition from other decomposers. In terms of function, fungal biomass, sporulation rates and litter decomposition by aquatic hyphomycetes in the tropics was reported to be equivalent to or much lower than observed in temperate zones. The feeding ecology of shredder inverte- brates is strongly related to the presence of microbial decomposers in the environment. The lack of shredders reported for some tropical rivers may be related to a low microbial biomass, well defended tropical leaves and frequent hydrological events which remove leaves before they can be used by shredders. Seasonal variations in rain fall in tropical and subtropical systems are likely to affect litter fall, the identity and quality of litter, the reproduction of aquatic hyphomycetes (due to turbulence effects) and therefore the community composition of aquatic hyphomycetes throughout the year. Future research on aquatic hyphomycetes and litter decomposition in the tropics and sub-tropics should address the diversity/identity gap, altitudinal gradient changes and the contribution of aquatic hyphomycetes to the trophic ecology of shredders.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Fungal Ecology website : http://www.sciencedirect.com/science/journal/17545048
HAL Id:hal-01281924
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Chinese Academy of Sciences (CHINA)
Other partners > Universidade de Coimbra (PORTUGAL)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Mae Fah Luang University - MFU (THAILAND)
Laboratory name:
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Deposited By: Eric Chauvet
Deposited On:23 Feb 2016 16:15

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