Figuras 37-47 - uploaded by Carolina Davila Domingues
Content may be subject to copyright.
37. Pinnularia angustistriata. 37. Vista da extremidade da rafe e helitoglossa (seta). 38-39. Surirella engleri. 40. Surirella tenera. 41. Nitzschia acicularis. 42-44. Nitzschia capitellata. 44. Detalhe das fíbulas e aréola. 45. Nitzschia palea. 46. Nitzschia paleacea. 47. Tryblionella victoriae. Figuras em microscopia eletrônica de varredura (37, 39, 43-44). Barra = 10 µm (37, 43-47); 20 µm (38, 41-42); 50 µm (39, 40).
Source publication
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...
Similar publications
Grand Lake St. Marys, hereafter Grand Lake, is a large shallow reservoir in western Ohio that has become hypereutrophic in recent decades owing to external phosphorus (P) loading. To restore water quality in Grand Lake, managers must decide whether to reduce external P loading from tributaries or continue to reduce internal P loading from sediments...
Cyanobacteria bloom suppression case study by geochemical augmentation.
The aim of presented study is to contribute to species list of algae, cyanobacteria and
diatoms from moist localities of James Ross Island, Solorina Valley (63° 53' S, 57° 48' W)
in particular. In 2012, samples of microbiological mats were taken from a bottom of
shallow depression close to a seashore line. The sampling site has been filled with mel...
The seasonal succession of algal species in the epipelon of shallow, mesotrophic pond Bezedník (Czech Republic) with special attention to diatoms (particularly Sellaphora) is described. The composition of epipelic algal assemblages changed over time in both higher taxonomic groupings and species representations. Spring and autumn were characterized...
Citations
... Aulacoseira alpigena is also acidophilous and thrives in oligotrophic waters (Houk 2003). Aulacoseira ambigua can be found in lowland lentic habitats with alkaline to slightly acidic waters that are mesotrophic to hypereutrophic (Houk 2003, Siver et al. 2005, Domingues & Torgan 2011. Aulacoseira laevissima is a rare species thriving in European island and continental lentic waters (Haworth 1988, Houk 2003, Houk & Klee 2007, Buczkó et al. 2010). ...
A new centric diatom, Aulacoseira kruegeriana sp. nov., collected from small streams in the Yungas (cloud forest) region of Bolivia, is described based on light and electron microscopy. The new species is morphologically similar to Aulacoseira principissa Van de Vijver, A. alpigena (Grunow) Krammer, A. ambigua (Grunow) Simonsen, A. gessneri (Hustedt) Simonsen, A. laevissima (Grunow in Van Heurck) Krammer, A. lirata (Ehrenberg) Ross, and A. nygaardii (Camburn) Camburn & D.F. Charles. However, it is distinguished by its finer frustule structure, presence and features of separation and linking spines, density of areolae, rotae as mostly three-point bars, a solid and thick ringleist and indistinctly sigmoid mantle striae. Aulacoseira kruegeriana is the first new species of Aulacoseira. Thwaites reported from Bolivia. However, the literature on centric diatoms in this country is currently scarce and, as more research is conducted on streams and lakes, it is likely that additional novel centric diatoms will be discovered.
... Urban lakes differ greatly in size, depth, drainage, water volume, hydrological balance, nutrient cycling and trophic status (García-Gil & Camacho, 2001). Although artificial urban lakes present environmental conditions suitable for supporting a highly diverse group of Euglenophyta, there have been few studies of these biotopes in the state of Rio Grande do Sul, although there have been some notable studies conducted by Rosa (1974), Cecy (1976;1990), Huzsar et al. (1990), Franceschini (1992), Alves-da- Silva & Torres (1992;1994a;1994b;1994c), Alves-da- Silva & Avila (1995) and Domingues & Torgan (2011). In Brazil as a whole, studies of Euglenophyta in urban lakes or ponds include those conducted by Heckmann et al. (1993), Jati & Train (1994), Branco & Senna (1996), Giani et al. (1999), Nogueira & Rodrigues (1999), Silva (1999), Ferreira & Menezes (2000), Goulart et al. (2002), Kepeller et al. (2002), Ferragut et al. (2005), Nogueira et al. (2008) and Tucci et al. (2006). ...
The objective of this study was to evaluate the taxonomic composition and richness of the genera Trachelomonas and Strombomonas (pigmented Euglenophyceae) in a subtropical urban lake (30º03'05"S; 51º10'34"W) within the Botanical Garden, in the city of Porto Alegre, located in the state of Rio Grande do Sul, Brazil, in order to contribute to the floristic knowledge of Euglenophyta in artificial urban lakes. From July 2007 to June 2008, we collected samples monthly from two sampling stations, using a 25-µm mesh plankton net. The samples were preserved in 4% formaldehyde. We evaluated the following environmental variables related to the water in the lake: ammonia content, silica content, organic matter content, dissolved oxygen concentration, temperature, pH, depth, transparency, electrical conductivity and rainfall. To study the species composition in relation to environmental factors, we used cluster analysis, principal components analysis, canonical correspondence analysis and indicator species analysis. At the specific and infraspecific level, 22 taxa were identified, Trachelomonas elliptica (Playf.) Defl. and T. gracillima Bal. & Dast. representing new records for the state of Rio Grande do Sul. The cluster analysis indicated seasonal variation, species richness being highest in the spring of 2007. Seven indicator species were characterized as acid-tolerant.
This study deals with the taxonomic composition of the division Chlorophyta from Tartarugas Lake, an urban system located at the Botanical Garden, Porto Alegre, in Rio Grande do Sul State. Phytoplankton samples were collected monthly, from June 2007 to May 2008 in the pelagic zone. Sixty one specific and infraspecific taxa were described. Scenedesmaceae presented the highest richness (37.7%) preceded by Selenastraceae (34.4%). Desmodesmus and Monoraphidium was best represented (10 taxa each one). Chlorotetraedron incus (Teil.) Kom. & Kov., Desmodesmus armatus (Chodat) Hegewald var. armatus, Monactinus simplex (Meyen) Corda var. simplex, Monoraphidium contortum (Thur.) Komá rková-Legnerová, M. convolutum (Corda) Komárková- Legnerová, M. minutum (Nägeli) Komárková- Legnerová, Pediastrum duplex Meyen var. rugulosum Raciborski and Stauridium tetras (Ehrenberg) Hegewald remained present throughout all seasons. Micractinium pusillum Fresenius was presented only during winter, when it was registered the lowest temperatures (13.6°C) were recorded. 17% of the taxa are new records to the artificial lake in Brazil.
