Does the Cosmopolitan Diatom Gomphonema parvulum (Kützing) Kützing Have a Biogeography?

Abarca, Nélida; Jahn, Regine; Zimmermann, Jonas; Enke, Neela

doi:10.1371/journal.pone.0086885

Cited by 97 publications

(65 citation statements)

References 48 publications

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“…The conditions of amplification were: an initial denaturation of 2 min at 94 °C, followed by 40 cycles at 94 °C for denaturation (1 min), 52.8 °C for annealing (45 s) and 72 ºC for extension (1.5 min), and a final extension of 10 min at 72 °C. (aBarca et al 2014).…”

Section: Methodsmentioning

confidence: 99%

Morphological and molecular evidence support description of two new diatom species from the genus Ulnaria in Lake Baikal

Kulikovskiy¹,

Lange‐Bertalot²,

Annenkova³

et al. 2016

Fottea

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Light and scanning electron microscopical observations are made on two non-raphid pennate species from Lake Baikal, Russia. Based on their morphologies, they are assigned to the genus Ulnaria. Molecular data from rbcL sequences were also generated from cultures of these two taxa. Combined morphological and molecular data suggest one of the species is the same as a species commonly referred to as Synedra acus, a species commonly reported from Lake Baikal and used as a model species for studies on valve silicification and nanotechnology applications. The second species is similar to Ulnaria ulna. Both taxa are important players in the ecology of Lake Baikal. Based on the combined molecular and morphological approach, and comparison of the species with recently designated types for both U. ulna and U. acus, we conclude that the two species are not synonymous with either U. acus or U. ulna, or other known species, and present full descriptions of them as species new to science.

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Section: Methodsmentioning

confidence: 99%

Morphological and molecular evidence support description of two new diatom species from the genus Ulnaria in Lake Baikal

Kulikovskiy¹,

Lange‐Bertalot²,

Annenkova³

et al. 2016

Fottea

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“…Por outro lado, pouco ainda se conhece a respeito da plasticidade fenotípica e da confiabilidade de caracteres na delimitação de táxons em diatomáceas (Mann 1999, Mann & Evans 2007. Estudos dessa natureza são ainda escassos e requerem, inclusive, análises filogenéticas utilizando dados moleculares a partir de abordagens polifásicas (Mann & Evans 2007, Zimmermann et al 2011, Abarca et al 2014.…”

Section: Resultsunclassified

Ocorrência e autoecologia de Acanthoceras zachariasii (Brun) Simonsen (Chaetocerales, Coscinodiscophyceae) na região centro-norte do Brasil

Morais

Nogueira

Artigas

et al. 2016

Hoehnea

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-(Occurrence and autoecology of Acanthoceras zachariasii (Brun) Simonsen (Chaetocerales, Coscinodiscophyceae) in the Central-Northern Brazil). In this study we presented the structural and ultrastructural characterization of Acanthoceras zachariasii (Brun) Simonsen, as well as its geographical distribution in the Amazon River Basin and Tocantins-Araguaia River Basin, Brazil, and provided the lectotypification of the taxon. We analyzed 454 phytoplanktonic samples, but the occurrence of A. zachariasii was recorded in only 14 of them. Of the total samples collected along the two basins, A. zachariasii was recorded only in 3.08%, which demonstrates the rarity of this taxon. This species was registered in lentic environments, with mesotrophic to eutrophic conditions, and pH varying from slightly acid to alkaline. Keywords: Amazon River Basin, Tocantins-Araguaia River Basin, Attheya zachariasii, Acanthoceras magdeburgense, lectotypification RESUMO -(Ocorrência e autoecologia de Acanthoceras zachariasii (Brun) Simonsen (Chaetocerales, Coscinodiscophyceae) na região centro-norte do Brasil). Apresenta-se a caracterização estrutural e ultraestrutural de Acanthoceras zachariasii (Brun) Simonsen, bem como, a distribuição geográfica da espécie nas bacias Amazônica e do Tocantins-Araguaia, Brasil, além da lectotipificação do táxon. Foram analisadas 454 amostras fitoplactônicas, sendo registrada a ocorrência de A. zachariasii em apenas 14. Do total de amostras coletadas nos estudos das duas bacias, apenas em 3,08% foram registrados representantes de A. zachariasii, demonstrando quão rara é a frequência de ocorrência do táxon. A espécie ocorreu em ambientes lênticos, mesotróficos a eutróficos, com pH variando de levemente ácidos a alcalinos. Palavras-chave: Bacia Amazônica, Bacia do Tocantins-Araguaia, Attheya zachariasii, Acanthoceras magdeburgense, lectotipificação IntroduçãoAcanthoceras zachariasii (Brun) Simonsen é caracterizada por apresentar frústula pouco silicificada, retangulares em vista pleural, com um espinho tubular em cada ângulo da valva (Round et al. 1990). A fragilidade da frústula dificulta a preservação e observação do táxon, uma vez que no processo de limpeza por oxidação e fixação o organismo pode ser destruído (Tremarin et al. 2015). Provavelmente seja este o motivo dos poucos registros desse táxon para o Brasil e para o mundo.Apesar dos poucos registros no país, A. zachariasii possui distribuição ampla, cosmopolita, porém a espécie, em geral, apresenta populações pouco

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“…choLnoKy following hustedt reported corresponding individuals first as G. subtile (1954: 126, Fig. 20;1958: 117, Figs 83-84) later as var. malayense (1962b: 323, Fig.…”

Section: Etymologymentioning

confidence: 92%

“…107). Liu et al 2013;abaRca et al 2014). The taxa described in this paper are a further example for the limited distribution of special diatoms or groups of diatoms respectively.…”

Section: Gomphonema Pantropicummentioning

confidence: 99%

Taxonomy and distribution of Gomphonema subtile Ehrenberg (Bacillariophyceae) and six related taxa

Reichardt¹

2015

Fottea

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This paper reports on Gomphonema subtile and related taxa which have been classified as varieties so far and for which the shape of the headpole has been considered to be extremely variable. In literature they are described as cosmopolitan. However, the shape of G. subtile proved to be quite constant and specimens with less inflated headpoles represent separate species with limited distribution. G. subtile and G. sagitta, together with related diatoms like G. cathedrale, G. maclaughlinii and G. subsagitta form a group which is distributed in holarctic regions. In tropical regions similar species like G. pantropicum or G. pseudosubtile occur. All the mentioned taxa are described in detail and for most of them SEM-images are presented for the first time. G. pseudosubtile and G. subsagitta are described as new species. G. pantropicum is a new name for G. subtile var. malayense which is raised to species rank. In addition a few similar diatoms from tropical regions are discussed briefly.

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Does the Cosmopolitan Diatom Gomphonema parvulum (Kützing) Kützing Have a Biogeography?

Cited by 97 publications

References 48 publications

Morphological and molecular evidence support description of two new diatom species from the genus Ulnaria in Lake Baikal

Morphological and molecular evidence support description of two new diatom species from the genus Ulnaria in Lake Baikal

Ocorrência e autoecologia de Acanthoceras zachariasii (Brun) Simonsen (Chaetocerales, Coscinodiscophyceae) na região centro-norte do Brasil

Taxonomy and distribution of Gomphonema subtile Ehrenberg (Bacillariophyceae) and six related taxa

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