5 documents found, page 1 of 1
Life history and population dynamics of a tree species in tropical semi-arid cl...
Silveira, Andréa Pereira; Martins, Fernando Roberto; Araújo, Francisca S.In semi-arid climates, plant population dynamics are strongly influenced by the amount and temporal distribution of rainfall. We monitored a population of the tree species Cordia oncocalyx (Boraginaceae) for 24 months in the dry thorny woodland of semi-arid northeastern Brazil, to investigate which life-history traits allow this tree to be locally dominant. We used horizontal life tables and a Lefkovitch matrix...
Biodiversity of arbuscular mycorrhizas in three vegetational types from the sem...
Pagano, Marcela Claudia; Zandavalli, Roberta B.; Araújo, Francisca S.Semiarid lands are the object of a limited number of studies, very few among them aimed at characterizing root-associated fungal communities. The diverse vegetation occurring in the tropical dry forest from the Ceará State, Brazil, core area of the Brazilian tropical semiarid, has been attributed to its soil, topography and climatic variation. However, the arbuscular mycorrhizal (AM) symbiosis may have an impor...
Septoglomus fuscum and S. furcatum, two new species of arbuscular mycorrhizal f...
Błaszkowski, Janusz; Chwat, Gerard; Kovács, Gábor M.; Gáspár, Bence K.; Ryszka, Przemysław; Orłowska, Elżbieta; Pagano, Marcela ClaudiaTwo new arbuscular mycorrhizal fungal species, (Glomeromycota) Septoglomus fuscum and S. furcatum, are described and illustrated. Spores of S. fuscum usually occur in loose hypogeous clusters, rarely singly in soil or inside roots, and S. furcatum forms only single spores in soil. Spores of S. fuscum are brownish orange to dark brown, globose to subglobose, (20–)47(–90) mm diam, rarely ovoid, 21–50 3 23–60 mm. ...
Are tree ontogenetic structure and allometric relationship independent of veget...
Silveira, Andréa P.; Martins, Fernando R.; Araújo, Francisca S.In temperate and tropical rainforests, ontogenetic structure and allometry during tree ontogeny are often associated with light gradients. Light is not considered a limiting resource in deciduous thorny woodland (DTW), but establishment and growth occur during a short rainy period, when the canopy is fully leaved and light in the understory may be modified. Our aim was to investigate whether the light gradient ...
Richness and diversity of Leguminosae in an altitudinal gradient in the tropica...
Lima, Jacira R.; Mansano, Vidal F.; Araújo, Francisca S.Many studies are based on the premise that, on a local scale, diversity is the result of ecological processes, whereas on a regional scale factors such as the topography, geology, hydrology, and historical and evolutionary events would influence this control. The Baturite Mountain Range (Cear ´ a state), located in the Brazilian semi-arid zone, is ´ considered an area of extreme importance for conservation with...