Figs 74-87 - available via license: Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported
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(Figs 74-76. Pinnularia globiceps Gregory, Figs 77-79. P. lundii Hustedt, Figs 80-81. P. septentrionalis Krammer, Figs 82-84. P.
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In the studies conducted in 2007-2012 in south-eastern Poland, 56 diatom taxa were found from the Pinnularia genus. Pinnularia brebissonii (Kutzing) Rabenhorst, P. obscura Krasske, P. viridiformis Krammer, P. lundii Hustedt, and P. viridis (Nitzsch) Ehrenberg occurred at most of the investigated sites. Eighteen taxa were considered as new to Polish...
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... nov. (7.5%), places this taxon within the general definition of Frustulia as a conglomerate of acidophilous, oligo to mesotraphentic taxa living in peatlands and acid ponds and rivers with low electrolyte content [20,23,52]. ...
Frustulia tunariensis sp. nov. is originated from a high-altitude peatland in the Tunari Cordillera, a branch of the Andean range in Bolivia. The new taxon is distinguished by the thick longitudinal ribs, the globose polar nodule with faint helictoglossa that does not produce an apical extension, and by the high areola and stria density, not found in any of the morphologically closely related taxa. Features of the folded valvocopula, such as the presence of a siliceous membrane as pars interior, and poroids present in the tube-like portion opening as slits to the valve interior and as a single row of poroids to the exterior, are also unique characters in the new taxon. Based on a literature review, a comparison of the newly proposed species with morphologically similar taxa was made. Also, published information shows the potential of girdle bands to distinguish groups of species and species themselves within Frustulia. Likewise, remarks on the ecological and distribution aspects of Frustulia in the Bolivian Altiplano are included, focusing on taxonomic quality, geographic coverage and sampling, and potential to represent the genus in the high Bolivian Andean plateau.
... Length: 65.1-68.5 µm; width: 7-7.8 µm; striae: 11-12 in 10 µm. Ecology: previously registered for waters with neutral pH and high conductivity (Noga et al. 2014). In Brazil, it was recorded from planktonic samples in Guaraguaçu River ) and from epiphytic samples in a mesotrophic reservoir of the South region (Marra et al. 2016). ...
... minor differs from Pinnularia viridis (Nitzsch) Ehrenberg by the valve outline and by the presence of a semi complex raphe (Krammer 2000). Ecology: considered as cosmopolitan (Krammer 2000); it is rare in waters with neutral to alkaline pH and in moderate to high conductivity (Cremer et al. 2004, Noga et al. 2014. It was previously registered for streams with acid pH and low conductivity, in Central Brazil (França et al. 2017). ...
Knowledge of biodiversity in oligotrophic aquatic ecosystems is fundamental to plan conservation strategies for protected areas. This study assessed the diatom diversity from an urban reservoir with oligotrophic conditions. The Piraquara I reservoir is located in an Environmental Protection Area and is responsible for the public supply of Curitiba city and the metropolitan region. Samples were collected seasonally between October 2007 and August 2008. Periphytic samples were obtained by removing the biofilm attached to Polygonum hydropiperoides stems and to glass slides. The taxonomic study resulted in the identification of 87 diatom taxa. The most representative genera regarding the species richness were Pinnularia (15 species) and Eunotia (14 species). Five species were registered for the first time in Brazil and seven in the State of Paraná. Taxonomic and ecological comments of the species registered are provided.
... These same diatoms appear in research conducted in similar environments. Some examples are the following: Noga et al. (2014) stated that Pinnularia subcapitata and P. subcapitata var. elongata have similar ecological preferences and Kitazawa (1995) found P. subcapitata var. ...
The Tinto and Odiel river basins (SW Spain) are known worldwide for their unique water characteristics. Such uniqueness is a consequence of their flow through the Iberian Pyrite Belt (an area rich in metal sulphides) and the mining activities in the basins. A process of sulphide oxidation occurs in this region, which acidifies the water and increases the amount of heavy metals in it. As a result, the rivers suffer the so-called "acid mine drainage" (AMD). Traditional biotic diatom-based indexes (IPS, IBD, EPI-D, etc.) do not take into account the pollution caused by AMD. The purpose of this paper is to develop a new diatom-based index which can serve as a useful and quick monitoring tool. Such tool must reflect the level of AMD while being user friendly. We present the development and validation of the ICM (Índice de Contaminación por Metales or Metal Pollution Index). ICM demonstrated to meet successfully the above criteria and, therefore, can assess water quality in the Tinto and Odiel Rivers. In addition, ICM was applied with satisfactory results in the Guadiamar River (SW Spain), which was subjected to AMD too. Thus, we propose to make use of it in any other basin with the same type of pollution.
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FOR FURTHER INFORMATION, PLEASE, MAIL TO THE FIRST AUTHOR: M. REYES FERNÁNDEZ
mariar.fernandez.hernandez@juntadeandalucia.es
... Diatomaceous analysis with TDI, GDI and IPS indices was also used for assessment of water qual- Sixty diatom taxa were recorded from the Polish Red List of Algae [Siemińska et al. 2006]. Eleven taxa from endangered category (E) and among them, most of the genus Pinnularia [Noga et al. 2014b]. ...
The studies on bentic diatoms were conducted in 2009-2011 at eight samplings sites over the Z˙ołynianka stream and its tributary, the Jagielnia. 427 diatom taxa were recorded in total. Achnanthidium minutissimum var. minutissimum, Aulacoseira ambigua, Fragilaria capucina var. capucina, Gomphonema parvlum, Navicula gregaria, Nitzschia palea and Planothidium lanceolatum were dominant taxa in both watercourses. Chemical analysis of water showed high chemical status of water at most of sampling sites. The results of diatomaceous analysis conducted with OMNIDIA software revealed moderate and poor condition of water. The best water quality was recorded in the Jagielnia stream (good or moderate status). The values of the analyzed indices showed the worst water quality on the Z˙ołynianka at site four, showing bad ecological status. TDI index deviated the most from the other two indices (IPS and GDI), always indicating poorer water quality.
The study aims at the taxonomic investigation of Raphid diatoms and reporting of some new taxa of Bacillariophyceae from the Indian subcontinent based on frustule ultrastructure. The diatoms are mainly from two groups, viz. Monoraphid and Biraphid were recorded as dominant genera from different eco-zones of Eastern India at regular intervals for five years. The study area includes, Darjeeling Himalayan hills, North Bengal Riverine Plain sand Rarh region (26º88'53" N; 88º18'28" E-22º37'61" N; 87º34'26" E). From the investigation, a total of 27 taxa appeared as new records from all over India. Hilly regions of Darjeeling housed most of the new reports of diatom species followed by the foot-hills area of Jalpaiguri. The majority of the taxa belong to Biraphid groups, like Eunotia, Pinnularia, Craticula, Navicula, Brachysira, Sellaphora, Placoneis, Cymbella and Gomphonema closely followed by Monoraphid groups including the genera Achnanthidium and Achnanthes. In a word, Darjeeling Himalayan Hill Region of Eastern India showed maximum diversity of the recorded species. Detailed systematic accounts have also been included in the investigation.
The high significance of peatlands for species, habitat, landscape and climate protection is widely recognised throughout Europe today. In addition to a brief sketch on the history of peatland use, the vegetation and site diversity of peatlands in Central Europe, their ecosystem services, national and international peatland protection initiatives, and the various strategies of rewetting as one of the most important measures for the restoration of peatlands are outlined. In the long term, the phosphorus and methane dynamics of rewetted peatlands remain problematic. As a case study for peatland restoration, the Dosenmoor in Schleswig-Holstein (N Germany) is presented.
O presente estudo teve como objetivo realizar um levantamento florístico para conhecer as espécies do gênero Pinnularia Ehrenberg (Bacillariophyceae) encontradas no lago Jurucuí, município de Belterra, estado do Pará. A pesquisa baseou-se em amostras obtidas no sedimento, plâncton e perifíton em junho de 2018. No presente estudo, o gênero Pinnularia esteve composto por 37 táxons (24 espécies, cinco variedades, dois conferatum e seis táxons identificados em nível genérico). Dentre estes, dois são as primeiras citações para a Amazônia brasileira: P. amabilis e P. biceps e cinco para o estado do Pará: P. brauniana, P. interruptiformis, P. paradivergens, P. subgibba var. capitata e P. subgibba var. undulata. Os exemplares analisados apresentaram amplas variações morfométricas, e em alguns casos com diferenças em relação às descrições realizadas em outros trabalhos, em especial, feitos para a Amazônia, o que contribui para a ampliação das características de identificação das espécies. Palavras-chave: diatomáceas, morfologia, ambientes lênticos, América do Sul. The present study aimed to carry out a floristic survey to know the taxonomic composition of the Pinnularia Ehrenberg genus (Bacillariophyceae) found in Jurucuí lake, Belterra city, Pará state. The study samples were obtained from the lake sediment, plankton and periphyton in June 2018. The results revealed the presence of 37 specific and infraspecific taxa (24 species, five varieties, two conferatum and six taxons identified at the generic level). Among these, P. amabilis and P. biceps are first records for the Brazilian Amazon region, and P. brauniana, P. interruptiformis, P. paradivergens, P. subgibba var. capitata and P. subgibba var. undulata are first records for the Pará State. The analyzed specimens presented wide morphometric variations, and in some cases with differences in relation to the descriptions made in other works done for the Amazon, which contributes to the expansion of species identification characteristics.
