Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon)
A new stalk-forming diatom was observed at high relative abundances on periphytic samples collected in the Rio Negro hydrographic basin (Brazilian Amazon) and is here described using light and scanning electron microscopy. We also present ecological preferences of the new species. Eunotia amazonica...
| Autor principal: | Almeida, Fabiane Ferreira de |
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| Outros Autores: | Santos-Silva, Edinaldo Nelson, Ector, L., Wetzel, C. E. |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
European Journal of Phycology
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/16934 |
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oai:repositorio:1-16934 |
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oai:repositorio:1-16934 Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon) Almeida, Fabiane Ferreira de Santos-Silva, Edinaldo Nelson Ector, L. Wetzel, C. E. Biomonitoring Community Dynamics Diatom Environmental Change Freshwater Ecosystem Freshwater Environment Geographical Distribution Growth Form Morphology Neotropical Region New Species Amazon River Amazonas Brasil Manaus Rio Negro Basin Bacillariophyta Cymbella Eunotia Eunotiaceae A new stalk-forming diatom was observed at high relative abundances on periphytic samples collected in the Rio Negro hydrographic basin (Brazilian Amazon) and is here described using light and scanning electron microscopy. We also present ecological preferences of the new species. Eunotia amazonica sp. nov. co-dominated periphytic samples collected during the rainy seasons of 2013 and 2014 near the city of Manaus (Amazonas, Brazil). The main diagnostic feature of the new species is the stalk-forming growth form (‘Cymbella-like’) illustrated here for the first time in the genus Eunotia Ehrenberg. Previous reports on growth forms in common European databases for this genus included colonial (‘ribbon-like’) but also ‘mobile’, ‘fixed by pads’ or ‘without structures of fixation’. We demonstrated that the three dominant Eunotia species in periphytic samples from the Rio Negro all exhibited distinct ‘growth forms’ or habits: Eunotia amazonica sp. nov. (stalked), Eunotia intricans Metzeltin & Lange-Bertalot (ribbon-like) and Eunotia rabenhorstiana (Grunow) Hustedt (branched-arborescent). The high diversity of species, many of which are unknown to science, as well as the poorly known life-forms and habits of the Eunotiaceae in the region, partially prevent the use of metrics based on life-form to assess ecological changes. Generic assumptions based on robust statistical methods may obscure reality and lead to biased conclusions of diatom community changes in poorly explored regions such as Neotropical freshwater rivers, where the Eunotiaceae are largely dominant, particularly in the Amazon basin. © 2018 British Phycological Society. 2020-06-15T21:37:27Z 2020-06-15T21:37:27Z 2018 Artigo https://repositorio.inpa.gov.br/handle/1/16934 10.1080/09670262.2017.1402372 en Volume 53, Número 2, Pags. 166-179 Restrito European Journal of Phycology |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Biomonitoring Community Dynamics Diatom Environmental Change Freshwater Ecosystem Freshwater Environment Geographical Distribution Growth Form Morphology Neotropical Region New Species Amazon River Amazonas Brasil Manaus Rio Negro Basin Bacillariophyta Cymbella Eunotia Eunotiaceae |
| spellingShingle |
Biomonitoring Community Dynamics Diatom Environmental Change Freshwater Ecosystem Freshwater Environment Geographical Distribution Growth Form Morphology Neotropical Region New Species Amazon River Amazonas Brasil Manaus Rio Negro Basin Bacillariophyta Cymbella Eunotia Eunotiaceae Almeida, Fabiane Ferreira de Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon) |
| topic_facet |
Biomonitoring Community Dynamics Diatom Environmental Change Freshwater Ecosystem Freshwater Environment Geographical Distribution Growth Form Morphology Neotropical Region New Species Amazon River Amazonas Brasil Manaus Rio Negro Basin Bacillariophyta Cymbella Eunotia Eunotiaceae |
| description |
A new stalk-forming diatom was observed at high relative abundances on periphytic samples collected in the Rio Negro hydrographic basin (Brazilian Amazon) and is here described using light and scanning electron microscopy. We also present ecological preferences of the new species. Eunotia amazonica sp. nov. co-dominated periphytic samples collected during the rainy seasons of 2013 and 2014 near the city of Manaus (Amazonas, Brazil). The main diagnostic feature of the new species is the stalk-forming growth form (‘Cymbella-like’) illustrated here for the first time in the genus Eunotia Ehrenberg. Previous reports on growth forms in common European databases for this genus included colonial (‘ribbon-like’) but also ‘mobile’, ‘fixed by pads’ or ‘without structures of fixation’. We demonstrated that the three dominant Eunotia species in periphytic samples from the Rio Negro all exhibited distinct ‘growth forms’ or habits: Eunotia amazonica sp. nov. (stalked), Eunotia intricans Metzeltin & Lange-Bertalot (ribbon-like) and Eunotia rabenhorstiana (Grunow) Hustedt (branched-arborescent). The high diversity of species, many of which are unknown to science, as well as the poorly known life-forms and habits of the Eunotiaceae in the region, partially prevent the use of metrics based on life-form to assess ecological changes. Generic assumptions based on robust statistical methods may obscure reality and lead to biased conclusions of diatom community changes in poorly explored regions such as Neotropical freshwater rivers, where the Eunotiaceae are largely dominant, particularly in the Amazon basin. © 2018 British Phycological Society. |
| format |
Artigo |
| author |
Almeida, Fabiane Ferreira de |
| author2 |
Santos-Silva, Edinaldo Nelson Ector, L. Wetzel, C. E. |
| author2Str |
Santos-Silva, Edinaldo Nelson Ector, L. Wetzel, C. E. |
| title |
Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon) |
| title_short |
Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon) |
| title_full |
Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon) |
| title_fullStr |
Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon) |
| title_full_unstemmed |
Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon) |
| title_sort |
eunotia amazonica sp. nov. (bacillariophyta), a common stalk-forming species from the rio negro basin (brazilian amazon) |
| publisher |
European Journal of Phycology |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/16934 |
| _version_ |
1787143927070982144 |
| score |
11.653393 |