Tetracladium apiense, a new aquatic species from South Africa

Sinclair, R.C.; Eicker, A.

doi:10.1016/s0007-1536(81)80087-3

Cited by 10 publications

(4 citation statements)

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“…Our four isolates originated from the same small stream, from one piece of a submerged unidentified dicot twig. Conidia of two strains (CCM F-23099 and CCM F-23199) conform well to the illustrations of the type (Sinclair and Eicker 1981, Fig. 1 A, B) but are less plump than drawn from the type material by Roldán et al (1987a, Fig.…”

Section: Morphological Comparisonssupporting

confidence: 81%

Potential use of barcoding to identify aquatic hyphomycetes

et al. 2010

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Tetracladium is a common aquatic hyphomycete genus, whose taxonomy has been based on the morphology and development of asexual spores. Ecological surveys have relied almost exclusively on spore morphology. Since selective pressures have resulted in convergent shapes, misidentifications are a concern. To supplement morphological information, we determined COX1, ITS and D1/D2 sequences as potential barcodes on 21 strains belonging to 7 described Tetracladium species and an unidentified strain. Attempts to amplify the IGS region were unsuccessful. The ratio of intraspecific to interspecific variability was optimal with ITS, which also provided the intuitively most acceptable cladogram. Typical conidia and their variability for the seven described species are illustrated. Internal node reliability depended less on total sequence length and more on the mixture of conserved and variable regions used to build cladograms. This finding can be exploited for quickly increasing phylogenetic accuracy without greatly increasing the amount of amplification and sequencing. The results have important implications for identifying freshwater hyphomycetes in the field but further work is required to establish if this method works with plant pathogens.

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Section: Morphological Comparisonssupporting

confidence: 81%

Potential use of barcoding to identify aquatic hyphomycetes

et al. 2010

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“…In addition to the type species, T. marchalianum , seven other species have been reported in the genus, e.g. T. apiense ( Sinclair & Eicker 1981 ), T. breve ( Roldán et al 1989 ), T. furcatum ( Descals & Webster 1983 ), T. maxilliforme ( Ingold 1942 ), T. nainitalense ( Sati et al 2009 ), T. palmatum ( Roldán et al 1989 ) and T. setigerum ( Ingold 1942 ). Recent phylogenetic analyses suggested that the genus is monophyletic and affiliated with Helotiales ( Nikolcheva & Bärlocher 2002 , Baschien et al 2006 , Letourneau et al 2010 , Seena et al 2010 ).…”

Section: Discussionmentioning

confidence: 99%

Psychrophilic fungi from the world's roof

Wang

Jiang²,

Wu³

et al. 2015

Pers - Int Mycol J

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During a survey of cold-adapted fungi in alpine glaciers on the Qinghai-Tibet Plateau, 1 428 fungal isolates were obtained of which 150 species were preliminary identified. Phoma sclerotioides and Pseudogymnoascus pannorum were the most dominant species. Psychrotolerant species in Helotiales (Leotiomycetes, Ascomycota) were studied in more detail as they represented the most commonly encountered group during this investigation. Two phylogenetic trees were constructed based on the partial large subunit nrDNA (LSU) to infer the taxonomic placements of these strains. Our strains nested in two well-supported major clades, which represented Tetracladium and a previously unknown lineage. The unknown lineage is distant to any other currently known genera in Helotiales. Psychrophila gen. nov. was therefore established to accommodate these strains which are characterised by globose or subglobose conidia formed from phialides on short or reduced conidiophores. Our analysis also showed that an LSU-based phylogeny is insufficient in differentiating strains at species level. Additional analyses using combined sequences of ITS+TEF1+TUB regions were employed to further investigate the phylogenetic relationships of these strains. Together with the recognisable morphological distinctions, six new species (i.e. P. antarctica, P. lutea, P. olivacea, T. ellipsoideum, T. globosum and T. psychrophilum) were described. Our preliminary investigation indicates a high diversity of cold-adapted species in nature, and many of them may represent unknown species.

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“…The remaining conidia were distributed in the same proportions among the three species. T. apiense, by far the most common species, was first described from the Apies River in South Africa (SINCLAIR and EICKER, 1981), and has since been reported from streams in North and South America, Europe (SANTOS-FLORES and BETANCOURT-LÓPEZ, 1997;GULIS et al, 2005) and Asia (SATI et al, 2003). Its dominance, as reported here, is unprecedented.…”

Section: Discussionmentioning

confidence: 99%

Leaf Decomposition in a Mountain Stream in the Sultanate of Oman

Alriyami

Victor

Seena

et al. 2009

International Review of Hydrobiology

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Decomposition of Juglans regia leaves was studied in fine and coarse mesh bags in a permanent mountain stream in Oman. A rapid initial mass loss, attributed to leaching, was followed by a more gradual decline. Daily exponential decay rates (k) calculated over 32 days were 0.011 (fine mesh litter bags) and 0.014 (coarse mesh litter bags). The difference between bag types was not significant, suggesting limited impact of leaf-shredding invertebrates. Ergosterol levels on leaves from fine mesh bags peaked at 0.3 mg g -1 AFDM after 16 days of stream exposure. During the experimental period, which followed the annual leaf fall, the concentration of aquatic hyphomycete conidia in the stream varied between 82 and 1362 l -1 . Based on the morphology of conidia found in the water column or released from leaves, we identified 14 species of aquatic hyphomycetes. Tetracladium apiense was the most common taxon (62.2% of conidia in water column during the field experiment). Three other Tetracladium species contributed another 8%. Plating out leaf particles yielded common epiphytic taxa such as Alternaria sp., Aureobasidium pullulans and Phoma sp.The measured metrics of leaf decay in this desert stream fall within the range of values observed in temperate and tropical streams, with clear evidence for an early leaching phase, and no evidence of a strong impact of leaf shredders. The community of aquatic hyphomycetes appears impoverished.

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Tetracladium apiense, a new aquatic species from South Africa

Cited by 10 publications

References 4 publications

Potential use of barcoding to identify aquatic hyphomycetes

Potential use of barcoding to identify aquatic hyphomycetes

Psychrophilic fungi from the world's roof

Leaf Decomposition in a Mountain Stream in the Sultanate of Oman

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