Diatoms from the Colombian and Peruvian Amazon: the Genera Encyonema, Encyonopsis and Gomphonema (Cymbellales: Bacillariophyceae)

Vouilloud, Amelia A.; Sala, Silvia E.; Núñez-Avellaneda, Marcela; Duque, Santiago R.

doi:10.15517/rbt.v58i1.5193

Cited by 11 publications

(7 citation statements)

References 7 publications

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“…Diatom studies conducted to date, showed that this group has high diversity the same as other groups of organisms and many new taxa for science have been recently described (Vouilloud, Sala, Núñez-Avellaneda, & Duque, 2010;MontoyaMoreno, Sala, Vouilloud & Aguirre, 2012).…”

Section: Discussionmentioning

confidence: 96%

Especies de Nupela (Naviculales: Bacillariophyceae) en aguas de tierras bajas de Colombia que incluyen a N. acaciensis nov. sp. y N. catatumbensis nov. sp.

Sala

Vouilloud

Plata-Díaz

et al. 2014

RBT

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Abstract:The genus Nupela comprises ca. 50 species that generally have a distribution restricted by bioclimatic frontiers. As part of an integrated analysis of the diatom flora of Colombia, in this study we focused our interest on the genus Nupela from lowland waters. Periphyton samples were collected from 150 sites of lotic water bodies in Colombia, taking into account hidrogeomorfological variability. In each sampling station, periphyton samples were obtained by scraping, and temperature, pH, dissolved oxygen and conductivity variables were measured. Samples were processed by both light microscopy (LM; Carl Zeiss Axio Scope.A1) and scanning electron microscopy (SEM; FEI-Quanta 450 and a Jeol JSM-6360 LV). The genus Nupela was found in 28 sites. Five taxa were identified, described and illustrated from tropical or subtropical environments: N. lesothensis, N. praecipua y N. subpallavicinii; these were new records for Colombia, and N. acaciensis and N. catatumbensis two new species for science. N. acaciensis is characterized by raphe branches of both valves equally long combined with cymbelloid symmetry, striae built by 2 transapically elongated areolae that delimit a longitudinal line at each hemivalve. N. catatumbensis is characterized by the presence of a well developed raphe in both valves; valves lanceolate with subcapitated to capitated ends and cymbelloid symmetry, striae built by 3-4 transapically elongated areolae, interestriae elevated as transapical ribs and internal proximal raphe ends hook-shaped. The genus Nupela was widely distributed in the studied basins but showed different distribution patterns: N. acaciensis and N. subpallavicini had a restricted distribution, while N. catatumbensis, N. lesothensis and N. praecipua had a wider distribution, and were collected in sites with significant variations in their ecomorphology, altitude, temperature, pH and electrolyte content. Rev. Biol. Trop. 62 (1): 241-255. Epub 2014 March 01.

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Section: Discussionmentioning

confidence: 96%

Especies de Nupela (Naviculales: Bacillariophyceae) en aguas de tierras bajas de Colombia que incluyen a N. acaciensis nov. sp. y N. catatumbensis nov. sp.

Sala

Vouilloud

Plata-Díaz

et al. 2014

RBT

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“…Vouilloud et al, 2010;Sala et al, 2015), Bolivia (e.g. Morales y Rivera, 2013;Morales et al, 2014), o en el mismo Perú (e.g.…”

Section: Discussionunclassified

Diversidad estacional de la clase bacillariophyceae en el río Utcubamba, Perú

Leiva-Tafur

Rascón

2017

INDES

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Diversidad estacional de la clase Bacillariophyceae en el río Utcubamba, PerúSeasonal diversity of the Bacillariophyceae class in the river Utcubamba, Peru RESUMENLas diatomeas en áreas tropicales son una importante herramienta de biomonitoreo de la calidad ecológica del agua gracias a sus características fisiológicas y morfológicas. En la presente investigación se realizó un inventario de las diatomeas existentes en la cuenca del río Utcubamba, en el Departamento de Amazonas, durante dos épocas (seca y húmeda) caracterizadas por poseer grandes diferencias estacionales en cuanto al régimen de precipitaciones. Se registraron 112 especies distribuidas en 21 familias y 25 géneros, siendo el género Gomphonema el más diverso con 18 especies identificadas, además de ser el más abúndate, con un 26% del total de individuos. De la misma forma, la especie Gomphonema rhombicum fue la más abundante con un 17% respeto al total de registros. Las dos épocas muestreadas mostraron resultados distintos tanto en diversidad como en abundancia de diatomeas, presentando la época seca valores superiores en ambas variables influidos por factores de perturbación de origen climático.Palabras clave: Diatomeas, inventario, abundancia, áreas tropicales. ABSTRACTDiatoms in tropical areas are an important biomonitoring tool for the ecological quality of water due to its physiological and morphological characteristics. In the present investigation an inventory of the diatoms existing in the Utcubamba river basin in the Department of Amazonas was carried out during two periods (dry and wet) characterized by great seasonal differences in precipitation regime. 112 species were recorded in 21 families and 25 genera, being the genus Gomphonema the most diverse with 18 species identified, besides being the most abundant, with 26% of the total of individuals. In the same way, the species Gomphonema rhombicum was the most abundant with a 17% respect to the total of records. The two sampled seasons showed different results in both diversity and abundance of diatoms, showing the dry season higher values in both variables influenced by climatic disturbance factors.

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“…Kurtkrammeria frequentis is known from various black water rivers and laguna in the Amazon region of South America (Krammer 1997b, Metzeltin & Lange-Bertalot 1998, Vouilloud et al 2010) and as a fossil in Ehrenberg material from Cayenne, Guyana, where it was reported as Cymbella aequalis (Reichardt 1995 Kurtkrammeria species are reported infrequently, primarily from mountainous regions, and consistently from oligotrophic or dystrophic waters with circumneutral pH and very low dissolved solids. Vouilloud et al (2010) report K. frequentis from rivers with pH values ranging from 5.1 to 6.3, conductivity of 10-16 µScm -1 , and low chlorophyll a content. These rivers are in a remote, undeveloped, and seldom visited area of the Amazon Basin.…”

Section: Discussionmentioning

confidence: 99%

Kurtkrammeria, a new genus of freshwater diatoms (Bacillariophyta, Cymbellaceae) separated from Encyonopsis

Bahls¹

2015

nova_hedwigia

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The new genus Kurtkrammeria is erected to include 13 species assigned to Encyonopsis that have (1) slit-like or crescent-shaped areolae aligned lengthwise along the apical axis, (2) striae convergent at the apices, and (3) internal proximal raphe ends hooked strongly towards the dorsal side of the valve. Some species of Kurtkrammeria also have dorsal stigmata, apical pore fields and internal anastomosing costae at both poles, and lateral papilla-like projections from intercostae into internal areola openings. Species of Kurtkrammeria are reported infrequently from fossil deposits and from recent diatom assemblages. Kurtkrammeria is a genus of remote and undeveloped regions from the Arctic to the Tropics, in both the Old World and New World. Most species are local or regional endemics and only four species -K. aequalis, K. neoamphioxys, K. recta, and K. subspicula -appear to be widely distributed. Kurtkrammeria species consistently occur in oligotrophic or dystrophic waters with very low specific conductance and circumneutral pH. An extant population of the very rare Kurtkrammeria stodderi is described from Montana, USA. Living cells of K. stodderi were observed to be motile and to have plastids similar to those of Encyonema species. Examination under SEM reveals that K. stodderi also has apical pore fields at both poles.

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Diatoms from the Colombian and Peruvian Amazon: the Genera Encyonema, Encyonopsis and Gomphonema (Cymbellales: Bacillariophyceae)

Cited by 11 publications

References 7 publications

Especies de Nupela (Naviculales: Bacillariophyceae) en aguas de tierras bajas de Colombia que incluyen a N. acaciensis nov. sp. y N. catatumbensis nov. sp.

Especies de Nupela (Naviculales: Bacillariophyceae) en aguas de tierras bajas de Colombia que incluyen a N. acaciensis nov. sp. y N. catatumbensis nov. sp.

Diversidad estacional de la clase bacillariophyceae en el río Utcubamba, Perú

Kurtkrammeria, a new genus of freshwater diatoms (Bacillariophyta, Cymbellaceae) separated from Encyonopsis

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