Four New Diatom Species From La Calera Hot Spring in the Peruvian Andes (Colca Canyon)

Vijver, Bart Van de; Cocquyt, Christine

doi:10.1080/0269249x.2009.9705792

Cited by 22 publications

(14 citation statements)

References 11 publications

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“…Although no comparable studies of endemism and gene flow exist for the algae, it is highly likely that similar processes occurred in populations and communities of these organisms. Therefore, use of European floras or taxonomic works for other regions of the world or even other South American ecoregions must be exercised with extreme caution (Morales et al, 2008(Morales et al, , 2009Van de Vijver & Cocquyt, 2009). As we have seen in the case of araphids selected from publications for the Andes, in none of the three cases was the application of European concepts correct.…”

Section: Discussionmentioning

confidence: 99%

“…As stated by Tyler (1996) and Kociolek & Spaulding (2000), force-fitting has been a major factor in the delay of our understanding of not only algal species distribution, but also of their true identity. Theriot et al (1985) and Van de Vijver & Cocquyt (2009) touched on this aspect based on Peruvian samples and publications, while Morales et al (2008; did the same for Bolivia. Force-fitting has not been exclusive to continental South America, but has also been a pervasive problem clouding diatom taxonomy and biogeography in the nearby Antarctic and sub-Antarctic regions (see discussions in Van de Vijver et al 2010b;.…”

Section: Introductionmentioning

confidence: 93%

“…In fact, the number of new taxa published from the Andean region has increased in recent years (e.g. Tapia et al, 2004;Maidana et al, 2009;Van de Vijver & Cocquyt, 2009;Álvarez-Blanco et al, 2011;Furey et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Current taxonomic studies on the diatom flora (Bacillariophyceae) of the Bolivian Altiplano, South America, with possible consequences for palaeoecological assessments

Morales¹,

Wetzel²,

Rivera³

et al. 2014

J. Micropalaeontol.

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Abstract. The present investigation is based on detailed taxonomical analyses combining light microscopy (LM), scanning electron microscopy (SEM) and critical reviews of publications and type material. This method revealed a higher number of diatom taxa than that reported for the Altiplano, reports that are based on LM and SEM, but force-fitting the taxa into their European relatives. It also became evident that some taxa often reported from the Altiplano do not occur or are less common in this region and that misidentifications are the consequence not only of force-fitting, but also of misinterpretation of the original protologues and illustrations (taxonomic concept drift). These findings have important repercussions on past palaeoecological assessments for the Altiplano, which have been based on ecological information for taxa developing in ecosystems of highly contrasting conditions. Here we present the case of three araphid diatoms, which were reported as known taxa from Europe and elsewhere, but in fact correspond to taxa described as new for the Altiplano or unpublished taxa. It is recommended that: (1) a flora for this region is developed utilizing sound microscopical data and reviewing pertinent type material, (2) key common taxa used for past palaeoecological studies in the Altiplano are reviewed using a taxonomically thorough and critical method, and (3) future palaeoecological studies for the Andes are supported by prior detailed taxonomical analysis.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

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Current taxonomic studies on the diatom flora (Bacillariophyceae) of the Bolivian Altiplano, South America, with possible consequences for palaeoecological assessments

Morales¹,

Wetzel²,

Rivera³

et al. 2014

J. Micropalaeontol.

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“…The historical diatom register from the Yellowstone National Park, described an extensive diatom beds of recent origin covering many square miles in the vicinity of the geyser and hot spring basins [5]. However, to compare and estimate distribution patterns, there are few available studies of diatom floras from geothermal systems in South America [11] [12], and there is no information of diatom richness/composition from the El Tatio geothermal field, considering that contain a high heterogeneity of microhabitat with unique environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Geothermal Diatoms: Seasonal Variability in the El Tatio Geothermal Field (Altiplano, Chile)

Angel¹,

Vila²,

Díaz³

et al. 2018

AiM

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Diatom floras were examined in a high-altitude geothermal field, 4200 -4500 m (29˚19'S 68˚W'), located in the Central Andean dry Puna ecoregion or southern Altiplano. These locations include hostile environments subjecting living organisms to extreme conditions. The aim of the present study was to investigate the spatial patterns and describe the response of diatom assemblages to differences in physical and chemical variables. Different shallow (<10 cm) aquatic systems with variable chemical and physical conditions (fumaroles, freshwater-saline rivers and swamps) were studied seasonally during 2011-2012. The conductivity exhibited high variability (360 to 18340 µS cm −1 ) among the systems studied, temperature was lower in rivers and swamps (6.8˚C -10˚C) and high in fumaroles stations (30˚C -37.5˚C), and pH was lower in fumaroles than freshwater systems (3.25 to 8.97). Statistical analyses suggest that the diatoms cluster into three major groups. The most common taxa include: Achnanthidium exiguum (Grunow) Czarnecki, Cocconeis placentula var. lineata (Ehrenberg) Van Heurck, Eolimna minima (Grunow) Lange-Bertalot, Staurosirella pinnata (Ehrenberg) Williams and Round, Navicula gregaria Donkin, Nitzschia inconspicua Grunow, Nitzschia palea (Kützing) Smith, Nitzschia perminuta (Grunow) Peragallo, and Planothidium lanceolatum (Brébisson ex Kützing) Lange-Bertalot. As expected, the 20 to 200 μm-size fraction contained the highest numbers of diatom taxa (53 species), although an unexpectedly high number (47 species) were also found in the smaller 5 to 20 μm-size fraction, more associated to fumaroles and saline systems. The 180 to 2000 μm size fraction contained only two species, including rosette-forming diatom Ulnaria ulna (Nitzsch) Compère, and the unicellular species Surirella chilensis Janisch, both species exclusively reported in freshwater systems. Canonical correspondence analysis (CCA) Other factors include substrate type, presence of macrophytes, current velocity and other local environmental conditions. The results presented here enhance our understanding of diatom richness/composition in hostile environments from a high-altitude arid and semi-arid geothermal region.

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“…Despite the recent publication of treatises on the diatoms from the Andes, the diatom flora of this extensive region in South America remains largely understudied (vaN de vijver & CoCquyt 2009). Even in zones of similar topography, such as the Altiplano shared by Peru, Bolivia and Chile, aquatic ecosystems can be quite disparate and may host contrasting microorganism assemblages (PatriCk 1961;MaNGuiN 1964;CruCes et al 2006;Cabrol et al 2007;among others).…”

Section: Introductionmentioning

confidence: 99%

Diatoms (Bacillariophyceae) from the Bolivian Altiplano: three new araphid species from the Desaguadero River draining Lake Titicaca.

Morales¹,

Novais²,

Chávez³

et al. 2012

Fottea

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Abstract:Three new araphid diatom species, Pseudostaurosira decipiens e. Morales, G. Chávez et eCtor, P. sajamaensis e. Morales et eCtor and Staurosira kjotsunarum e. Morales, Novais et eCtor are described from a single sample taken from the Desaguadero River in the Bolivian Altiplano. These species clearly belong in their respective genera as evidenced by their morphological features studied using light (LM) and scanning electron microscopy (SEM). Pseudostaurosira decipiens is unique in its genus because of the combination of lanceolate-shaped valves with central area, well-developed spines lacking ligulae, siliceous deposits on outer and inner areolar openings similar to flaps, and the inner rounded structure of the apical pore fields. Pseudostaurosira sajamaensis is different from other species of Pseudostaurosira due to its elliptic to lanceolate valves bearing a wide central sternum, spines with developed ligulae and bilobed flaps, robust volae and reduced or absent apical pore fields. Staurosira kjotsunarum is unique within Staurosira in having elevated costae on both external and internal views, narrowly spatulate spines that hold onto areolae of neighboring valves along a chain, and striae composed of round poroids underneath the apical pore fields on the valve mantle. The three species are compared with morphologically similar taxa and a brief analysis of the richness found in the studied sample in the context of previous publications on diatoms from the Andes and contiguous regions is presented.

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Four New Diatom Species From La Calera Hot Spring in the Peruvian Andes (Colca Canyon)

Cited by 22 publications

References 11 publications

Current taxonomic studies on the diatom flora (Bacillariophyceae) of the Bolivian Altiplano, South America, with possible consequences for palaeoecological assessments

Current taxonomic studies on the diatom flora (Bacillariophyceae) of the Bolivian Altiplano, South America, with possible consequences for palaeoecological assessments

Geothermal Diatoms: Seasonal Variability in the El Tatio Geothermal Field (Altiplano, Chile)

Diatoms (Bacillariophyceae) from the Bolivian Altiplano: three new araphid species from the Desaguadero River draining Lake Titicaca.

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