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Dynamique saisonnière des spores d'hyphomycètes aquatiques de quatre rivières

Chauvet, Eric Dynamique saisonnière des spores d'hyphomycètes aquatiques de quatre rivières. (1992) Nova Hedwigia, 54 (3-4). 379-395. ISSN 0029-5035

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Abstract

Seasonal differences in the occurrence of aquatic hyphomycete conidia were studied in four streams located along an altitudinal gradient. Samples were taken at monthly intervals for one year using two independent techniques simultaneously: direct sampling of foam, and incubation of leaf litter collected from each stream. The concentration of conidia in foam of the three upland sites exhibited a dramatic increase in Nov.-Dec. The number of species present rose at the same time but a similar, or even higher, increase was also noticed in late spring in all four streams. The following successional pattern of major species emerged: Lunulospora curvula, Heliscus tentaculus (low altitude) and Tricladium chaetocladium (higher altitude) in summer and early autumn, F1agel/ospora curvula, Tetrachaetum elegans and Lemonniera terrestris in autumn, Anguillospora longissima and Clavariopsis aquatica in winter and early spring, Articulospora tetracladia in spring and Alatospora acuminata throughout the year. The relative abundance of several species appeared to be strongly related to the sampling technique, a pattern possibly related to the origin of conidia (i.e. terrestrial or floating substrates versus leaf litter in the bottom of the stream). Species with large tetraradiate conidia (e.g., Lemonniera centrosphaera, Tetrachaetum elegans and Tricladium chaetocladium) are possibly inefficiently trapped by foam, thus explaining their rarity in this substrate. The results from this study suggest that the morphology of conidia influences the behaviour and, possibly, the dynamics of species in streams.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
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Deposited By: Eric Chauvet
Deposited On:05 Feb 2014 09:00

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