Interaction between the mineral content and the occurrence number of aquatic fungi in leaves submerged in a stream in the Atlantic rainforest, São Paulo, Brazil

• Published in: Revista brasileira de botânica 1999-08, Vol.22 (2), p.133-139
• Main Authors: SCHOENLEIN-CRUSIUS, IRACEMA H.(Instituto de Botânica), PIRES-ZOTTARELLI, CARMEN L. A.(Instituto de Botânica), MILANEZ, ADAUTO IVO(Instituto de Botânica), HUMPHREYS, RUBENS D.(Instituto de Pesquisas Tecnológicas)
• Format: Article
• Language: English
• Subjects: aquatic Hyphomycetes; Atlantic rainforest; Leaf litter; nutritional requirements; PLANT SCIENCES; zoosporic fungi
• ISSN: 0100-8404; 1806-9959; 1806-9959
• DOI: 10.1590/S0100-84041999000200004

Leaves of Ficus microcarpa L. f., Quercus robur L., and Alchornea triplinervia (Spreng.) Muell. Arg., submerged in a stream of the Atlantic rainforest in the "Reserva Biológica do Alto da Serra de Paranapiacaba", State of São Paulo, Brazil, were collected monthly, from April to November 1990, in order to determine the number of fungal occurrences (zoosporic fungi and aquatic Hyphomycetes), and the content of total N (%), total P (%), K+ (%), Ca+2 (%), Mg+2 (%), S+3 (%), Fe+3 (ppm), Cu+3 (ppm), Mn+2 (ppm), Zn+2 (ppm), Bo (ppm), Na+2 (ppm) and Al+3 (ppm). According to the tests of Kruskal-Wallis, Mann-Whitney and Wilcoxon, the means of the mineral content of the three types of leaves were significantly different, except for Mg+2 (%), Mn+2 (ppm), Zn+2 (ppm) and Na+2 (ppm). On comparing the mineral content with the number of fungal occurrence, an independence test showed a positive correlation between the presence of zoosporic fungi on the leaves of A. triplinervia and the total nitrogen, phosphorus and S+3 content, whereas the aquatic Hyphomycetes depended on the amount of Ca+2 available. Regarding leaves of F. microcarpa, the occurrence of zoosporic fungi was linked to the S+3 level, and the presence of aquatic Hyphomycetes, to the content of K+, Ca+2, S+3 and Bo. On Q. robur leaves, zoosporic fungi showed a positive correlation with the Ca+2 content, but a negative one with Fe+3 and Al+3 levels, while the occurrence of aquatic Hyphomycetes was influenced by the content of Ca+2, Mg+2, Fe+3, Al+3, Mn+2, Zn+2 and Na+2. The correlation between the occurrence number of aquatic Hyphomycetes and a high mineral content indicates that their nutritional requirements may be more complex than those of zoosporic fungi. Further studies are still required to understand the implications of this tendency on the diversity of aquatic native mycota. Folhas de Ficus microcarpa L.f., Quercus robur L. e Alchornea triplinervia (Spreng.) Muell. Arg., submersas em um riacho na Mata Atlântica da Reserva Biológica do Alto da Serra de Paranapiacaba, no estado de São Paulo, Brasil, foram coletadas mensalmente, de abril a novembro de 1990, para a determinação do número de ocorrências de fungos (fungos zoospóricos e Hyphomycetes aquáticos), teores de N total (%), P total (%), K+ (%), Ca+2 (%), Mg+2 (%), S+3 (%), Fe+3 (ppm), Cu+3 (ppm), Mn+2 (ppm), Zn+2 (ppm), Bo (ppm), Na+2 (ppm) e Al+3 (ppm). De acordo com os testes de Kruskal-Wallis, Mann-Whitney e Wilcoxon, as médias dos parâmetros det