Evaluation of growth and biomass production of Arthrospira (Spirulina) fusiformis in laboratory cultures using waters from the Ethiopian soda lakes Chitu and Shala

Ogato, Tadesse; Kifle, Demeke; Fetahi, Tadesse; Sitotaw, Baye

doi:10.1007/s10811-014-0251-4

Cited by 27 publications

(18 citation statements)

References 31 publications

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“…and Mg 2? ions recorded in this lake (Ogato et al 2014) further support the phenomenon of precipitation.…”

Section: Chemical Characteristicssupporting

confidence: 71%

“…Shala is a typical soda lake characterized by high pH, saline-alkaline conditions and high phosphate, but a frequently limiting level of nitrogen compounds (Ogato et al 2014). Despite the saline-alkaline water that Arthrospira prefers to grow in, Lake Shala is devoid of Arthrospira and is known for its low phytoplankton productivity (Kebede et al 1994;Gebre-Mariam 2002;Ogato and Demeke, unpublished).…”

Section: Methodsmentioning

confidence: 99%

“…and Mg 2? ) (Ogato et al 2014). The major driver for the saline-alkaline features of these soda lakes is the high surface evaporation rate, which exceeds the water input due to their closed basins (Jones et al 1994;Grant 2006).…”

Section: Chemical Characteristicsmentioning

confidence: 99%

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Spatio-temporal variations in underwater light climate, thermal and chemical characteristics of the tropical soda lake, Lake Shala, Ethiopia

2015

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Although soda lakes are highly sensitive to environmental changes and suited for the study of vital ecological processes owing to their unique biological and physicochemical properties and closed nature, there are limited studies on and knowledge of their basic ecology. In this study, temporal and vertical fluctuations of underwater light climate, thermal and chemical characteristics of the soda lake Lake Shala were studied using data collected on 11 occasions over an annual cycle. Measured parameters of underwater light climate depicted light-limited conditions with slight temporal variations, which are attributable to non-biological turbidity and high water column mixing depth. Its water column exhibited superficial thermal stratification with turbulently mixing and well-oxygenated conditions. Alkalinity, pH and conductivity were high but exhibited small temporal and vertical variations. These parameters increased slightly during the rainy season, possibly due to saline inflows associated with precipitation. Most of the major algal nutrients showed small temporal and vertical variations. NO 3 -and NH 3 in the euphotic zone were often very low or undetectable, while soluble reactive phosphate and total phosphorus were very high throughout the study period. The concentration of SiO 2 was remarkably low, which was probably associated with biological uptake and some chemical processes within the lake. In general, physicochemical parameters of Lake Shala exhibited small temporal and vertical variations despite the current threat of environmental degradation, possibly because of the high resilience of the lake associated with its low productivity and voluminous nature.

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“…and Mg 2? ions recorded in this lake (Ogato et al 2014) further support the phenomenon of precipitation.…”

Section: Chemical Characteristicssupporting

confidence: 71%

Section: Methodsmentioning

confidence: 99%

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Spatio-temporal variations in underwater light climate, thermal and chemical characteristics of the tropical soda lake, Lake Shala, Ethiopia

2015

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“…Lake Shala is a typical soda lake characterized by a high pH, saline–alkaline conditions and a high phosphate content, but with very low nitrogen levels (Ogato et al . ). Its water is rich in sodium (Na + ), carbonate (CO 3 2− ), bicarbonate (HCO 3 − ) and chloride (Cl − ), attributable to their presence in large concentrations in the trachytic and rhyolitic rocks of the Ethiopian Rift (Klemperer & Cash ), although they are poor in divalent cations (calcium [Ca 2+ ] and magnesium [Mg 2+ ]) (Ogato et al .…”

Section: Methodsmentioning

confidence: 97%

Phytoplankton composition and biomass in tropical soda Lake Shala: seasonal changes in response to environmental drivers

Ogato

Kifle

2017

Lakes & Reservoirs

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Although soda lakes are valuable, sensitive aquatic resources where phytoplankton play a decisive role for the entire ecological functions, they are among the least‐studied ecosystems. Seasonal variations in phytoplankton composition, abundance and biomass in relation to some environmental parameters of the little known, deep, large, volcanic and saline–alkaline Lake Shala were investigated over an annual cycle. The lake phytoplankton community consisted of relatively diverse taxa (23) belonging to Bacillariophyceae, Cryptophyta, Cyanoprokaryota and Dinophyta. Bacillariophyceae and Cryptophyta were the dominant groups throughout the annual cycle, accounting for about 57% and 22% of the total number of species, and 28% and 69% of the total abundance of the phytoplankton community, respectively. Cryptomonas spp. were most abundant throughout nearly all months, contributing about 59%–95% of total phytoplankton abundance, followed by Thalassiosira sp. (1%–35%). The chlorophyll‐a concentration, as a proxy for algal biomass, was generally low (mean 17 μg L−1), exhibiting only small seasonal variation. The strong, inverse relation of chlorophyll‐a with water transparency (r = −0.69; n = 11) and the persistent dominance of species adapted to low‐light conditions and mixing suggest the overriding importance of these factors in controlling the lake's phytoplankton. The results of the present study generally suggest the phytoplankton composition and biomass in Lake Shala exhibited muted seasonal changes, despite the environmental perturbations, probably because of the lake's high buffering capacity against allochthonous impacts because of its voluminous nature.

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“…In Ethiopia, the cost of nutrient media for biomass production can be significantly reduced by using lakes water. In a recent laboratory experimental study, Ogato et al [49] demonstrated that 25% and 50% supplemented Lake Shala water can be preferably used to produce Arthrospira biomass, thereby reducing the cost of nutrients by 75% and 50%, respectively. Mass cultivation of Arthrospira has been ongoing on the shore of Lake Shala [12], which can be scaled-up to a meaningful extent.…”

Section: Arthrospira Productionmentioning

confidence: 99%

Greening a Tropical Abijata-Shala Lakes National Park, Ethiopia - A Review

Fetahi¹

2016

J Ecosyst Ecogr

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The aim of this review is to assess and document the status of Abijata-Shala Lakes' National Park (ASLNP), to investigate the possible causes for the water level reduction of Lake Abijata and to promote sustainable utilization of the Park. The Park was established to protect and conserve large number of water birds that use Lake Abijata as feeding and Lake Shala as nesting and breeding grounds. Actually, Lake Shala is the continent's most important breeding colony of great white pelicans. The Park also provides wintering ground and maintenance station for large number of birds including from Southern African, Sub-Saharan and Palaearctic species. Consequently, the Park was submitted to the Ramsar Convention on wetlands as an international important candidate site. However, this natural heritage is currently deteriorating due to human encroachment, grazing by cattle, uncontrolled water abstraction and other anthropogenic activities. Since the 1980s, the water level of Lake Abijata has significantly dropped, fishery has totally collapsed, and birds such as Lesser Flamingo (Phoeniconaias minor Geoffroy) and Great White Pelican (Pelecanus onocrotalus roseus) have been migrating to nearby lakes. Briefly, the lake is shrinking (so far greater than about 100 km 2 ) and facing imminent threat of collapse obliterating the existence of the Park. As a result, the Park is one of IBAs (Important Bird and Biodiversity Areas) in danger sites, which are priority sites for immediate action. To improve this deteriorating condition of the Park, I demonstrate resources use of the Park within the framework of green economy, which protects ecosystem services and utilizes natural resources sustainably. Lastly, a few recommendations for management measures are outlined as mechanisms to protect the ecosystems and the park.

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Evaluation of growth and biomass production of Arthrospira (Spirulina) fusiformis in laboratory cultures using waters from the Ethiopian soda lakes Chitu and Shala

Cited by 27 publications

References 31 publications

Spatio-temporal variations in underwater light climate, thermal and chemical characteristics of the tropical soda lake, Lake Shala, Ethiopia

Spatio-temporal variations in underwater light climate, thermal and chemical characteristics of the tropical soda lake, Lake Shala, Ethiopia

Phytoplankton composition and biomass in tropical soda Lake Shala: seasonal changes in response to environmental drivers

Greening a Tropical Abijata-Shala Lakes National Park, Ethiopia - A Review

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