Hemitrichia serpula var. piauiensis (Trichiaceae, Myxomycetes) - a new variety from Brazil

Cavalcanti, Laise de Holanda; Mobin, Mitra

doi:10.1590/s0102-33062001000100013

Cited by 5 publications

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“…with smooth spirals and spores with a coarser reticulum. Cavalcanti & Mobin [ 34 ] named var. piaueinsis from Brazil, noting the more scattered and shorter spines of the capillitium and a finer and more regular reticulation of the spores.…”

Section: Introductionmentioning

confidence: 99%

Speciation in progress? A phylogeographic study among populations of Hemitrichia serpula (Myxomycetes)

et al. 2017

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Myxomycetes (plasmodial slime molds, Amoebozoa) are often perceived as widely distributed, confounding to the “everything is everywhere” hypothesis. To test if gene flow within these spore-dispersed protists is restricted by geographical barriers, we chose the widespread but morphologically unmistakable species Hemitrichia serpula for a phylogeographic study. Partial sequences from nuclear ribosomal RNA genes (SSU) revealed 40 ribotypes among 135 specimens, belonging to three major clades. Each clade is dominated by specimens from a certain region and by one of two morphological varieties which can be differentiated by SEM micrographs. Partial sequences of the protein elongation factor 1 alpha (EF1A) showed each clade to possess a unique combination of SSU and EF1A genotypes. This pattern is best explained assuming the existence of several putative biospecies dominating in a particular geographical region. However, occasional mismatches between molecular data and morphological characters, but as well heterogeneous SSU and heterozygous EF1A sequences, point to ongoing speciation. Environmental niche models suggest that the putative biospecies are rather restricted by geographical barriers than by macroecological conditions. Like other protists, myxomycetes seem to follow the moderate endemicity hypothesis and are in active speciation, which is most likely shaped by limited gene flow and reproductive isolation.

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Section: Introductionmentioning

confidence: 99%

Speciation in progress? A phylogeographic study among populations of Hemitrichia serpula (Myxomycetes)

et al. 2017

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“…In particular, in Piauí, the Brazilian government created the Sete Cidades National Park (PNSC), covering an area of 6,221 ha, aiming to study and protect the diversity of water, vegetation, and soil resources (IBDF, 1979). During the last ten years, geomorphological and quantitative surveys of vegetation and animals have been conducted (Digby et al 1996;Cavalcanti and Mobin, 2001;Castro et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Biological properties of disturbed and undisturbed Cerrado sensu stricto from Northeast Brazil

et al. 2017

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The aim of this study was to measure soil microbial biomass and soil surface fauna in undisturbed and disturbed Cerrado sensu stricto (Css) from Sete Cidades National Park, Northeast Brazil. The following sites were sampled under Cerrado sensu stricto (Css) at the park: undisturbed and disturbed Css (slash-and-burn agricultural practices). Total organic and microbial biomass C were higher in undisturbed than in disturbed sites in both seasons. However, microbial biomass C was higher in the wet than in the dry season. Soil respiration did not vary among sites but was higher in the wet than in the dry season. The densities of Araneae, Coleoptera, and Orthoptera were higher in the undisturbed site, whereas the densities of Formicidae were higher in the disturbed site. Non-metric multidimensional scaling analysis separated undisturbed from disturbed sites according to soil biological properties. Disturbance by agricultural practices, such as slash-and-burn, probably resulted in the deterioration of the biological properties of soil under native Cerrado sensu stricto in the Sete Cidades National Park.Keywords: soil microbial biomass, soil fauna, sustainability, soil disturbance. Propriedades biológicas de Cerrado sensu stricto preservado e não preservado do Nordeste do BrasilResumo O objetivo do estudo foi avaliar as propriedades biológicas do solo em área de Cerrado sensu stricto preservadas e não preservadas do Parque Nacional de Sete Cidades, Nordeste do Brasil. Os seguintes sites sob Cerrado sensu stricto (Css) foram avaliados: preservado (UND) e não preservado (DIS). O C orgânico total e da biomassa microbiana foram maiores na área preservada do que na não preservada em ambas estações seca e chuvosa. Entretanto, o C da biomassa microbiana foi maior na estação chuvosa do que na seca. A respiração do solo não variou entre as áreas, mas foi maior na estação chuvosa. As densidades de Araneae, Coleoptera e Ortoptera foram maiores na área preservada, enquanto as densidades de Formicidae foram maiores na área não preservada. A analise de escalonamento não-métrico separou a área preservada da não-preservada de acordo com as propriedades biológicas. Os distúrbios no solo pelas atividades agrícolas, como corte-e-queima, resultaram na deterioração das propriedades biológicas do Cerrado nativo no Parque Nacional de Sete Cidades.Palavras-chave: biomassa microbiana do solo, fauna do solo, sustentabilidade, distúrbio no solo.

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Myxobiota of the Brazilian Atlantic Forest: species on oil palm tree (Elaeis guineensis, Arecaceae)

Silva

Cavalcanti²

2010

Rodriguésia

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Elaeis guineensis Jacq. (Arecaceae), the oil palm tree, serves as a phorophyte for many different groups of organisms, someof whichhelp decompose organic matter comingfromthe organs of the tree itself or fromremainsof other plants retained in leaf sheaths. To study the myxobiota of E. guineensis, we examined living and dead trunks, leaves, bracts and inflorescences in the Gurjaú Ecological Reserve, in the township of Cabo de Santo Agostinho, Pernambuco, Brazil. Incidence and species abundance were determined in three Atlantic forest fragments. The reported species are listed herein, followed the known distribution of each species in Brazil, and which of them occur on palm trees. All of the subclasses and five orders were recorded and 22 species were added to the list of myxomycetes associated with oil palm trees in Brazil. The highest incidence value was recorded on dead leaves. Ceratiomyxa fruticulosa (O. F. Müll.) T. Macbr., Arcyria cinerea (Bull.)Pers. and Physarum compressum Alb.& Schwein. werethe most commonspecies, while Hemitrichia serpula (Scop.) Rostaf. ex Lister showed the highest levels of abundance and incidence, thus confirming its preference for the substrates provided by palm trees.

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Hemitrichia serpula var. piauiensis (Trichiaceae, Myxomycetes) - a new variety from Brazil

Cited by 5 publications

References 2 publications

Speciation in progress? A phylogeographic study among populations of Hemitrichia serpula (Myxomycetes)

Speciation in progress? A phylogeographic study among populations of Hemitrichia serpula (Myxomycetes)

Biological properties of disturbed and undisturbed Cerrado sensu stricto from Northeast Brazil

Myxobiota of the Brazilian Atlantic Forest: species on oil palm tree (Elaeis guineensis, Arecaceae)

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