The occurrence of Myxomycetes in Heliconia psittacorum L.f. inflorescences was researched within four conservation units located in Northeast Brazil, aiming at evaluating the occupation of this microhabitat in fragments of Atlantic Forest along an altitude between 30-750 m. Inflorescences attached to the plant were examined; dead flowers and bracts were collected to assemble moist chambers (368). Four families, four genera and 10 species were recorded. A preference was evidenced for a basic pH substrate and a predominance of calcareous species (5:1). The composition of the myxobiota in fragments pertaining to altitudes above 400 m was similar and differed significantly from the one found in fragments of lowland forests (<100 m). Physarum compressum and Arcyria cinerea are the most characteristic species of the studied myxobiota.Keywords: biodiversity, floricolous, Heliconia, myxobiota, tropical forests.
Microhabitats ocupados por Myxomycetes na Floresta Atlântica Brasileira: inflorescências de Heliconiaceae
ResumoA ocorrência de mixomicetos em inflorescências de Heliconia psittacorum L.f. foi pesquisada em quatro unidades de conservação situadas no Nordeste do Brasil, visando avaliar a ocupação deste microhabitat em fragmentos de Floresta Atlântica, numa faixa altitudinal de 30-750 m. Foram examinadas partes mortas de inflorescências ainda presas à planta; flores e brácteas mortas foram colhidas para montagem de câmaras-úmidas (368). Foram registrados quatro famílias, quatro gêneros e 10 espécies. Evidenciou-se preferência para substrato com pH básico e predominância de espécies calcárias (5:1). A composição da mixobiota nos fragmentos de altitudes acima de 400 m foi semelhante e diferiu significativamente da encontrada nos fragmentos de florestas de terras baixas (<100 m). Physarum compressum e Arcyria cinerea são as espécies mais características da mixobiota estudada.Palavras-chave: biodiversidade, florícola, Heliconia, mixobiota, florestas tropicais.
The Legado Verdes do Cerrado Sustainable Development Reserve is home to the largest private contiguous area of native vegetation in the Cerrado (Brazilian Savanna) biome, but its flora is still little studied. A floristic and phytosociological study was carried out in four phytophysiognomies of the Reserve (cerrado sensu stricto, cerradão, dry forest and ciliary forest). Eighty 10 x 10-m plots were systematically installed, with 20 in each phytophysiognomy. All live woody individuals with diameter at breast height ≥ 5 cm and height greater than 130 cm were measured. A total of 933 live individuals were sampled, with an estimated density of 1,166 ind ha-1, belonging to 154 species and 46 families. Diversity and equability were assessed at 4.47 nats ind-1 and 0.88, respectively. The diametric distribution of the individuals showed a negative exponential (reverse J), while the one for height classes showed a tendency towards normal distribution. Species richness and structural parameters were within the values found for native vegetation, except for the cerrado sensu stricto.
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