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Fontana C.S.,Pontifical Catholic University of Rio Grande do Sul | Burger M.I.,Fundacao Zoobotanica do Rio Grande do Sul | Magnusson W.E.,National Institute of Amazonian Research
Urban Ecosystems | Year: 2011

Cities are highly modified environments in which the only areas that resemble natural landscapes are urban parks with low human population density. Attempts are frequently made to maintain high bird diversity in cities for aesthetic or educational reasons. However, it remains unclear whether local site characteristics are important in determining bird assemblage composition or whether simplification of the assemblage is an inevitable consequence of the changes associated with human population density. From May 1998 to December 1999, we undertook bird counts at 521 points in Porto Alegre, Rio Grande do Sul, southern Brazil. Our main goal was to understand the pattern of distribution of the bird species richness and density within the city and determine which variables most affect species assemblages. We recorded 132 species belonging to 43 families that are common in Rio Grande do Sul and obtained quantitative data on 121 species in survey sites. The two most abundant species (House Sparrow, Passer domesticus and Rock dove, Columba livia) were exotics. Analysis based on a reduced subset of 134 points surveyed in spring/early summer suggested that there was a North-south gradient in assemblage structure. Variation in assemblage structure was also affected by the number of trees, urban noise and human population density. However, human population density had a much smaller effect on richness and assemblage structure than variables subject to management, such as tree density and noise levels. These results suggest that complex communities may be maintained in densely populated urban areas of sub-tropical South-America given adequate urban planning. © 2011 Springer Science+Business Media, LLC.


da Frota Jr. M.L.C.,Federal University of Rio Grande do Sul | da Silva R.B.,Federal University of Rio Grande do Sul | Mothes B.,Fundacao Zoobotanica do Rio Grande do Sul | Henriques A.T.,Federal University of Rio Grande do Sul | Moreira J.C.F.,Federal University of Rio Grande do Sul
Current Pharmaceutical Biotechnology | Year: 2012

Over the last few years, samples from the marine environment have been screened for a variety of compounds with different biological activities. Among all marine organisms, sponges represent one of the most promising sources of leads in the research of new cancer drugs. However, there are few reports on screening Brazilian marine sponges for biological activities. In the following review, the current status of natural product research relating to Brazilian marine sponges is summarized, particularly for compounds demonstrating potential antitumor activity. © 2012 Bentham Science Publishers.


We present the result of the diatoms study at the mouths of the Sinos, Gravataí, Caí and Jacuí rivers, with emphasis on the form of the plastids and their arrangement within the cell from the Jacuí Delta. Although this character has been neglected in recent decades, it is currently recognized by its ecological importance. We analyzed monthly samples, collected at the deep of 20 cm in the pelagic zone from September 2009 to August 2010. 64 taxa, distributed in three classes, 11 orders, 18 families and 23 genera were identifi ed. The most representative families were Bacillariaceae (16 taxa), Naviculaceae (8), Aulacoseiraceae (7), Eunotiaceae (5) and Pinnulariaceae (5). The genus Nitzschia was the richest, with 15 species. The highest richness was observed in the Rio dos Sinos (52 taxa) and the lowest in Jacuí River (38 taxa). Only 24 taxa were present in the four rivers and six taxa were exclusive from one river. Considering the previous knowledge of the diatoms occurring in the rivers mouths of the Delta Jacuí, 43 species are mentioned for the fi rst time, which demonstrates the contribution of this study.


This study was carried out in isolated and interlinked lagoons, swamps, dams and in a stream of the Coastal Plain of Rio Grande do Sul, in the autumn and spring of 2003. A total of 33 specific and infra-specific taxa of Chlorococcales lato sensu were identified. Among the aquatic environments, the swamps and lagoons from the Casamento Lagoon area presented the highest specific richness. The species occurred more frequently in the shore line than in the pelagic zone of the environments. The study showed that most of the species (59.3%) were of rare occurrence, and Monoraphidium contortum (Thur.) Kom.-Legn. was the only constant species. The taxa Ankistrodesmus densus Kors., A. stipitatus (Chod.) Kom-Legn., Coelastrum cruciatum Schmid., Kirchneriella dinae (Bohl.) Com., and Lagerheimia wratislaviensis var. bispina Hortob. are mentioned for the first time in the State of Rio Grande do Sul. Descriptions, illustrations and measurements of the taxa are presented.


Pereira A.C.,Federal University of Rio Grande do Sul | Torgan L.C.,Fundacao Zoobotanica do Rio Grande do Sul | Melo S.,Federal University of Pará
Acta Amazonica | Year: 2012

This study reports the taxonomy and temporal distribution of the Pinnularia genus occurring in the lower course Negro river (03°02'46,5"S e 60°15'13,1"W) along an annual cycle. Samples were collected in the water column monthly, from October 2002 to September 2003. The species were described and commented based on their morphology and morphometry. Eleven species and four varieties are registered, illustrated and incorporated in a taxonomic key. P. sterrenburgii var. sterrenburgii Metzeltin & Lange-Bertalot and P. subgibba var. capitata Metzeltin & Krammer are the first references to Negro river. Temporally, the highest species richness occurred from October and December 2002, low water period, when happened more interaction between water and sediment, and the contribution of the benthos individuals. On base in taxa occurrence during this study, only P. confirma was frequently, with occurrence in more than 50% of sample analyzed.


Bes D.,Federal University of Rio Grande do Sul | Ector L.,Center De Recherche Public Gabriel Lippmann | Torgan L.C.,Fundacao Zoobotanica do Rio Grande do Sul | Lobo E.A.,University of Santa Cruz do Sul
Iheringia - Serie Botanica | Year: 2012

Aiming to study the flora of epilithic diatoms of the Pardinho River, southern Brazil, we collected samples of epilithic diatoms in five sampling stations along the river during an annual cycle (August 2001 to July 2002). The epilithic diatom flora of Pardinho River was represented by 99 taxa which were distributed among 23 families and 41 genera. The most representative families were Naviculaceae (14 taxa), Gomphonemataceae (10) and Bacillariaceae (10). The genera richest in species were Gomphonema Ehrenberg, Navicula Bory, Eunotia Ehrenberg and Nitzschia Hassal. Two new species are proposed (Nupela pardinhoensis Bes, Torgan & Ector and Surirella bouillonii Bes, Ector & Torgan). Morphometric data, 234 LM and SEM photomicrographs are presented.


Bicca A.B.,Fundacao Zoobotanica do Rio Grande do Sul | Torgan L.C.,Fundacao Zoobotanica do Rio Grande do Sul | dos Santos C.B.,Fundacao Zoobotanica do Rio Grande do Sul
Revista Brasileira de Botanica | Year: 2011

The Eunotiaceae study in several environments (lakes, swamps and dams) in the Costal Plain of Rio Grande do Sul State was carried out in the autumn and the spring of 2003. Twenty six specific and infra-specific taxa were identified, one belonging to Actinella and twenty five to Eunotia. The highest richness of Eunotia species was reported in the swamps where we found a lush marginal vegetation and more acid water (pH 4,3 and 5,4). Eunotia bilunaris (Ehr.) Souza, E. tridentula Ehr. var. tridentula, E. vumbae Choln., E. yberai Freng. and E. zygodon Ehr. are new records for the Coastal Plain of Southern Brazil. The species are described, commented, and illustrated in light microscope (LM) and/or in scanning electron microscope (SEM).


Domingues C.D.,Fundacao Zoobotanica do Rio Grande do Sul | Torgan L.C.,Fundacao Zoobotanica do Rio Grande do Sul
Revista Brasileira de Botanica | Year: 2011

This study aims to the knowledge of phytoplankton composition of the Tartarugas pond, located at the Botanical Garden, Porto Alegre city in Rio Grande do Sul State. The samplings were carried out monthly, from June 2007 to May 2008, at one station in three different depths in the pelagic zone. Forty-nine specific and infraspecific taxa belonging to seven classes were recorded. Cyanobacteria presented the highest number of taxa (35% of recorded taxa), followed by Bacillariophyceae (33%) and Euglenophyceae (16.3%). Descriptions, measurements and illustrations of the taxa are presented as well as their distribution during the annual cycle.


Burliga A.L.,Fundacao Zoobotanica do Rio Grande do Sul | Kociolek J.P.,University of Colorado at Boulder | Salomoni S.E.,Fundacao Zoobotanica do Rio Grande do Sul
Phytotaxa | Year: 2013

A new genus of the diatom family Eunotiaceae Kützing is described along with a new species. Eunotioforma Kociolek & Burliga gen. nov. shares asymmetry about the apical axis with other members of the family (except Peronia de Brébisson & Arnott ex Kitton), and is distinguished from other genera in the family by having its raphe system almost entirely on the valve face and transapical striae interrupted near the center line of the valve. Eunotioforma mattogrossiana sp. nov. is described from the Do Sangue River, an oligotrophic and acidic stream situated in the State of Mato Grosso, Central Western region of Brazil. When compared with previously described taxa, the new species differs with respect to size, striae densities, areolar densities and an uncommonly high number of rimoportulae per valve. Seven other taxa are assigned to the new genus, and the systematic position of Eunotioforma and the evolution of the raphe within the family is discussed. © 2013 Magnolia Press.


A new species of Collaea DC. is described. C. riparia is a reophytic species that occurs in rocky areas, in riverbeds and banks prone to flooding. An identification key to the related species, as well as description, illustrations, data on flowering and fruiting periods, and habitat are presented.

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