期刊
JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY
卷 20, 期 4, 页码 533-549出版社
NORTH AMER BENTHOLOGICAL SOC
DOI: 10.2307/1468086
关键词
aquatic; lignicolous; mitosporic fungi; biodiversity; stream ecology
Longitudinal and temporal distribution patterns of freshwater ascomycetes and dematiaceous hyphomycetes on submerged wood were investigated at 3 sites along the Lam Tsuen River in Hong Kong. Two-hundred-and-six species were recorded. Ascomycete genera were dominated by Annulatascaceae, Halosphaeriaceae, Lasiosphaeriaceae, Lophiostomataceae, and Magnaporthaceae; the most common taxa were Aniptodera chesapeakensis, Aquaticola ellipsoidea, Helicosporium griseum, Massarina purpurascens, M. thalassioidea, Ophioceras commune, and Sporoschisma uniseptatum. There were no significant differences (ANOVA, p > 0.05) in total number of species among the sites. However, the number of species of Halosphaeriaceae (p < 0.01) and Lasiosphaeriaceae (p < 0.05) was significantly higher at Site 3, and Annulatascaceae was dominant at Sites 1 and 2 (p < 0.05). Downstream changes in species composition were strongly correlated with elevated concentrations of NO3-N (r(2) = 0.66), NH3-N (r(2) = 0.66), and PO4-P (r(2) = 0.73) resulting from human disturbance. The variation in species composition was also weakly correlated with other physico-chemical variables such as conductivity (r(2) = 0.16) and aluminum (r(2) = 0.11). Species diversity fluctuated temporally but did not change (ANTOVA, p > 0.05) between dry and wet seasons. Species composition shifted and the frequency of occurrence of certain dominant taxa declined after heavy rain-fall associated with El Nino, possibly because increased discharge washed away well-colonized woody substrata.
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