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Recife, Brazil

De Oliveira R.C.,University of Brasilia | De Santana S.H.,University of Brasilia | Da Silva A.S.,University of Brasilia | Maciel J.R.,Jardim Botanico Do Recife | Valls J.F.M.,University of Brasilia

Paspalum L. (Poaceae) has high species richness and economic importance in the Brazilian flora. Given the importance of regional studies to increase taxonomic knowledge of the species and update the flora of Brazil's list, this study aims to describe the genus and species of Paspalum from Rio Grande do Norte, as part of a larger Flora of Rio Grande do Norte project. Collections were made in all the phytogeographic regions of Rio Grande do Norte during the last four years, and a survey was done of the herbaria with representative collections of local flora. The conservation status of the species was evaluated according to IUCN regional categories. We recorded 16 species of Paspalum in Rio Grande do Norte. Paspalum carinatum Humb. & Bonpl. ex Flüggé, P. gardnerianum Nees and P. pumilum Nees are considered vulnerable in Rio Grande do Norte state, due to man-made pressures on the environment where they occur. However, they are not threatened when evaluated on a global scale. Based on an analysis of populations in the field and under cultivation, we propose to synonymize P. pleostachyum Döll under P. ligulare Nees. Contrary to what is found in the literature, the preference for using the name Paspalum crassum Chase over P. tumidum Kuhlm. is justified. This work includes a key for species identification, morphological descriptions, taxonomic and nomenclatural comments, information on distribution and regional-threat criteria, as well as ecological aspects and illustrations of the species. © 1935 JBRJ. Source

Maciel J.R.,Jardim Botanico Do Recife | Maciel J.R.,Federal University of Pernambuco | Louzada R.,Federal University of Pernambuco

In this paper a new species of Hohenbergia from Bahia, Brazil, H. lativaginata, is described. Compared with 4 other related species and illustrated. © 2014 Magnolia Press. Source

do Nascimento L.M.,Jardim Botanico Do Recife | de Sa Barretto Sampaio E.V.,Federal University of Pernambuco | Rodal M.J.N.,University of Pernambuco | Lins-e-Silva A.C.B.,University of Pernambuco
Journal of Forest Research

Changes in physiognomy, species composition and structure, and dispersal mechanisms of canopy and subcanopy plant assemblages were investigated along a chronosequence of three ages: 12, 20, and 50+ years old (=old-growth), three replications in each, in an Atlantic Forest landscape in Northeastern Brazil. Our objective was to investigate whether there is floristic and structural convergence along secondary succession. There were significant differences between secondary and old-growth forests in density and basal area only for the subcanopy. Differences in density between forest ages were noted when the assemblage was analyzed per diameter and height classes. Richness of canopy species of both secondary ages differed from those of old-growth forests. Some dominant species in the canopy of secondary forests showed a significant decrease in density with increasing age, which indicates an ongoing process of floristic changes. The low level of shared species between secondary and old-growth forests supports the idea that species composition is one of the last components to recover during successional process. Zoochory was the most important dispersal guild in species percentage and number, irrespective of stand age. Although regenerating areas can take alternative pathways, our results indicate that secondary Atlantic Forest sites have a high potential for natural regeneration. This recovery is recorded as a physiognomic convergence of the canopy layer in as little as 12 years, and progressive introductions of later successional species into the plant assemblage that lead to convergence in terms of the diversity and richness of the subcanopy and of dispersal guilds just 20 years after abandonment. © 2014, The Japanese Forest Society and Springer Japan. Source

Santo F.S.E.,State University of Feira de Santana | Maciel J.R.,Jardim Botanico Do Recife | Filho J.A.S.,Federal University of Vale do Sao Francisco
Revista Arvore

The objective of this study was to quantify the impact of herbivory by goats on natural populations of Bromelia laciniosa Mart. ex Schult. f. (Bromeliaceae), an endemic species to the Caatinga biome. Field studies were conducted Caboclo (8°28'56,4''S, 40°56'6,9''W, 588 m alt.), municipality of Afrânio, Pernambuco state. This area is regarded as being highly biologically important and therefore it is a priority area for conservation. The quantitative analysis of this impact was based on the inventory of 10 plots of 2.000 m2, along a pre-existing path in the study area, and consisted in doing the accounting of flowering B. laciniosa individuals and the percentage of individuals which had their flowers foraged by goats. Additionally, we also obtained information on the phenology, floral morphology and fruit and seed set rates of this bromeliad. It was found that out of the 246 individuals surveyed, 65.8% had their flowers foraged by these animals. The estimate of consumed flowers was 8,748 and the likely number of fruit and seeds that thus could not develop were approximately 7,227 fruits and 252,945 seeds. Foraging of inflorescences by goats reduces fruit and seed set rates and it may thus directly interfere with the conservation of this bromeliad. Source

Maciel J.R.,Jardim Botanico Do Recife | Maciel J.R.,Federal University of Pernambuco | Louzada R.,Federal University of Pernambuco | Alves M.,Federal University of Pernambuco

Herein is described and illustrated a new Aechmea species. Aechmea nigribracteata grows in southern Bahia (Brazil), a region recognised as highly diverse in bromeliads. Aechmea nigribracteata belongs to Aechmea subg. Chevaliera and has completely dentate, blackish floral bracts and petals with two crenate-laciniate ligules. © 2014 Magnolia Press. Source

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