A spatio-chemical survey of hydrogeothermal springs in Lake Elementaita, Kenya

Mwaura, Francis

doi:10.1007/bf02442126

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…Lake Elmenteita is situated at 0° 27′ S 36° 15′ E on the floor of the Kenyan Rift Valley at 1776 m above sea level and has no direct outlet (Melack, 1988). The region is characterized by a hot, dry and semi-arid climate with a mean annual rainfall of about 700 mm (Mwaura, 1999). Due to the high temperatures there are very high evaporation rates during the drier seasons, leading to a seasonal reduction in the total surface area.…”

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confidence: 99%

Belliella kenyensis sp. nov., isolated from an alkaline lake

Akhwale

Göker

Rohde

et al. 2015

International Journal of Systematic and Evolutionary Microbiology

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A red-pigmented, Gram-reaction-negative, aerobic bacterial strain, designated No.164 T , was isolated from sediment sample from the alkaline Lake Elmenteita located in the Kenyan Rift Valley. Results of 16S rRNA gene sequence analysis indicated that the isolate represented a member of the genus Belliella, with the highest sequence similarity (97 %) to Belliella pelovolcani DSM 46698 T . Optimal growth temperature was 30-35 6C, at pH 7.0-12.0 in the presence of 0-4 % (w/v) NaCl. Flexirubins were absent. The respiratory menaquinone (MK-7), predominant cellular fatty acids (iso-C 15 : 0 , anteiso-C 15 : 0 and a mixture of C 16 : 1 v7c and/or iso-C 15 : 0 2-OH) and DNA G+C content (38.1 mol%) of strain No.164 T were consistent with those of other members of the genus Belliella. The polar lipids consisted of phosphatidylethanolamine, eight unspecified lipids and one unspecified phospholipid. Several phenotypic characteristics can be used to differentiate this isolate from those of other species of the genus Belliella. The results of polyphasic analyses presented in this study indicated that this isolate should be classified as representing a novel species of the genus Belliella. The name Belliella kenyensis sp. nov. is therefore proposed; the type strain is strain No.164 T (5DSM 46651 T 5CECT 8551 T ).A globally distributed, environmentally abundant group of micro-organisms, the phylum Bacteroidetes or CytophagaFlavobacterium-Bacteroides (CFB) group (Ludwig & Klenk, 2001) is considered to be a bacterial group of special relevance for aquatic environments (Brettar et al. 2004). Members of the phylum Bacteroidetes constitute a significant proportion of marine microbial communities (Glöckner et al., 1999) and are known to play an important role in the biogeochemical cycling and the degradation of organic matter such as complex polysaccharides (Höfle, 1992;Pinhassi et al., 1999;Cottrell & Kirchman, 2000). The family Cyclobacteriaceae (a member of the class Cytophagia, phylum Bacteroidetes) was proposed (Ludwig et al., 2008) and comprises six genera which includes the genus Belliella. The genus Belliella currently comprises two species; Belliella pelovolcani isolated from a rare mud volcano in Wandan, Pingtung County, Taiwan (Arun et al., 2009) and Belliella baltica isolated from the Baltic sea (Brettar et al., 2004). In this paper we describe morphological, physiological and chemical data which support the identification of isolate No.164 T , isolated from a soda lake, Lake Elmenteita in the Kenyan Rift Valley, as representing a novel species of the genus Belliella.Lake Elmenteita is situated at 0 u 279 S 36 u 159 E on the floor of the Kenyan Rift Valley at 1776 m above sea level and has no direct outlet (Melack, 1988). The region is characterized by a hot, dry and semi-arid climate with a mean annual rainfall of about 700 mm (Mwaura, 1999). Due to the high temperatures there are very high evaporation rates during the drier seasons, leading to a seasonal reduction in the total surface area. The size of Lake Elmenteita ...

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confidence: 99%

Belliella kenyensis sp. nov., isolated from an alkaline lake

Akhwale

Göker

Rohde

et al. 2015

International Journal of Systematic and Evolutionary Microbiology

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“…The warm ground which is common in the area is associated with N-S normal faulting as reported also for Magadi area [12]. Lake Magadi water is mostly derived from underground hot water inflow with a continuous recharge from the surface waters [10,13]. It is therefore important to investigate Lake Magadi's thermal structure by delineating the depth to the heat source and the geometry of the subsurface fractures in order to know the distribution and the flow paths of hydrothermal fluids as a prelude to understanding the geothermal potentials of the field.…”

Section: Introductionmentioning

confidence: 59%

Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift

Komolafe

Kuria

Woldai

et al. 2012

International Journal of Geophysics

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The tectonic lineaments and thermal structure of Lake Magadi, southern Kenyan rift system, were investigated using ASTER data and geophysical methods. Five N-S faults close to known hot springs were identified for geoelectric ground investigation. Aeromagnetic data were employed to further probe faults at greater depths and determine the Curie-point depth. Results indicate a funnel-shaped fluid-filled (mostly saline hydrothermal) zone with relatively low resistivity values of less than 1 Ω-m, separated by resistive structures to the west and east, to a depth of 75 m along the resistivity profiles. There was evidence of saline hydrothermal fluid flow toward the surface through the fault splays. The observed faults extend from the surface to a depth of 7.5 km and are probably the ones that bound the graben laterally. They serve as major conduits for the upward heat flux in the study area. The aeromagnetics spectral analysis also revealed heat source emplacement at a depth of about 12 km. The relative shallowness implies a high geothermal gradient evidenced in the surface manifestations of hot springs along the lake margins. Correlation of the heat source with the hypocenters showed that the seismogenetic zone exists directly above the magmatic intrusion, forming the commencement of geodynamic activities.

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“…The study site, Lake Elmenteita, is situated at 0 o 27′ S 36 o 15′ E on the floor of the Kenyan Rift Valley at 1776 m above sea level and has no direct outlet [12]. The region is characterized by a hot, dry and semi-arid climate with a mean annual rainfall of about 700 mm [13]. Due to the high temperatures there are very high evaporation rates during the drier seasons, leading to a seasonal reduction in the total surface area.…”

Section: Methodsmentioning

confidence: 99%

Comparative genomic analysis of eight novel haloalkaliphilic bacteriophages from Lake Elmenteita, Kenya

Akhwale

Rohde

et al. 2019

PLoS ONE

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We report complete genome sequences of eight bacteriophages isolated from Haloalkaline Lake Elmenteita found on the floor of Kenyan Rift Valley. The bacteriophages were sequenced, annotated and a comparative genomic analysis using various Bioinformatics tools carried out to determine relatedness of the bacteriophages to each other, and to those in public databases. Basic genome properties like genome size, percentage coding density, number of open reading frames, percentage GC content and gene organizations revealed the bacteriophages had no relationship to each other. Comparison to other nucleotide sequences in GenBank database showed no significant similarities hence novel. At the amino acid level, phages of our study revealed mosaicism to genes with conserved domains to already described phages. Phylogenetic analyses of large terminase gene responsible for DNA packaging and DNA polymerase gene for replication further showed diversity among the bacteriophages. Our results give insight into diversity of bacteriophages in Lake Elmenteita and provide information on their evolution. By providing primary sequence information, this study not only provides novel sequences for biotechnological exploitation, but also sets stage for future studies aimed at better understanding of virus diversity and genomes from haloalkaline lakes in the Rift Valley.

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A spatio-chemical survey of hydrogeothermal springs in Lake Elementaita, Kenya

Cited by 10 publications

References 12 publications

Belliella kenyensis sp. nov., isolated from an alkaline lake

Belliella kenyensis sp. nov., isolated from an alkaline lake

Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift

Comparative genomic analysis of eight novel haloalkaliphilic bacteriophages from Lake Elmenteita, Kenya

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