Inundation and fire can affect the structure of riparian vegetation in wetlands. Our aim was to verify if there are differences in richness, abundance, basal area, composition and topographic preference of woody species in riparian forests related to the fire history, flooding duration, or the interaction between both. The study was conducted in the riparian forests of the Paraguay River some of which were burned three times between 2001 and 2011. We sampled trees with a girth of at least 5 cm at breast height in 150 5 × 10 m plots (79 burned and 71 unburned). We also measured height of the flood mark and estimated the flooding duration of each plot. We performed Generalized Linear Mixed Models to verify differences in richness, basal area, and abundance of individuals associated to interaction of fire and inundation. We used an analysis of similarity (ANOSIM) and indicator species analysis to identify differences in composition of species and the association with burned and unburned area according to different levels of inundation. Finally, we used a hierarchical set of Generalized Linear Models (GLM), the so-called HOF models, to analyse each species’ specific response to inundation based on topography and to determine their preferred optimal topographic position for both burned as well as unburned areas. Richness was positively associated with elevation only in burned areas while abundance was negatively influenced by inundation only in burned areas. Basal area was negatively associated with time of inundation independent of fire history. There were 15 species which were significant indicators for at least one combination of the studied factors. We found nine species in burned areas and 15 in unburned areas, with response curves in HOF models along the inundation gradient. From these, five species shifted their optimal position along the inundation gradient in burned areas. The interaction of fire and inundation did not appear to affect the basal area, but it did affect the richness, number of individuals, success of some species, and seemed to shape the boundary of these forests as shown by the difference in the positioning of these species along the inundation gradient.
In this contribution the rediscovery of the bromeliad Dyckia excelsa in Mato Grosso do Sul state, central-western Brazil, is reported. This species was first described based on a single individual from a particular collection in 1993 with no precise locality. Illustrations and a brief discussion on the leaf anatomy of the species are provided. One additional species, Dyckia gracilis, which has been overlooked by previous authors, is included in the list of Bromeliaceae of Mato Grosso do Sul State. An updated key for Dyckia species from the region of D. excelsa is presented. The status of D. excelsa in Mato Grosso do Sul State, Brazil, is discussed, and recommendations for its conservation are offered.
Resumo O presente estudo teve por finalidade estudar as espécies da família Lauraceae no município de Corumbá-MS, baseado principalmente em coleções botânicas depositadas em herbários. Foram também realizadas coletas em várias regiões do município, principalmente na morraria Santa Cruz. São registradas para o município 10 espécies subordinadas a cinco gêneros, a saber: Aiouea trinervis, Aniba heringerii, Cassytha filiformis, Nectandra amazonum, N. cissiflora, N. gardneri, N. hihua, N. psammophila, Ocotea diospyrifolia e O. velloziana. Aniba heringerii é citada pela primeira vez para o Mato Grosso do Sul. Chaves para a identificação, descrições e ilustrações das espécies são apresentadas.
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