Heavy metals in surface sediments of Lake Naivasha, Kenya: spatial distribution, source identification and ecological risk assessment

Olando, Grace; Olaka, Lydia; Okinda, Philip O.; Abuom, Paul O.

doi:10.1007/s42452-020-2022-y

Cited by 21 publications

(6 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sediments near the inlets of the rivers have more clay than the rest of Lake Malawi due to the deposition of eroded material from agricultural fields [58,60]. Another tropical lake with a sandier bottom than Lake Tana is the 9 m deep and 160 km 2 large Lake Navashi in Kenya that has 33% clay, 40% silt, and 30% sand [61]. The inflow and outflow to this lake that is located in the Rift valley was mostly via the subsurface.…”

Section: Relationship With Lake Depthmentioning

confidence: 99%

Bottom Sediment Characteristics of a Tropical Lake: Lake Tana, Ethiopia

et al. 2020

View full text Add to dashboard Cite

Sediment concentration of rivers in developing countries has been increasing greatly over the last 50 years due to the conversion of forest to continuously cultivated land with the increasing population. Few studies have addressed its effect on sedimentation and water quality of the lakes by analyzing bottom sediment characteristics. In this study, the objective was to investigate the spatial distribution (and their interrelationships) of the bottom sediment characteristics in the largest lake in Ethiopia, Lake Tana where water hyacinths have been spreading rapidly during the last decade. Sediment samples were collected from the lake bottom at 60 locations and analyzed for texture, organic matter, total nitrogen, and available phosphorus. Bottom sediment samples had a median of 75% clay, 13% silt, and 9% sand. Clay was greatest in the northwestern part and smallest in the areas near the major rivers entering or exiting the lake. Clay percentage and lake depth were strongly correlated. The mean organic matter content of bottom sediment was 16 g kg−1, total nitrogen 0.8 g kg−1, and Olsen available phosphorus 19 mg kg−1. Phosphorus concentrations peaked where water hyacinths were found in the northeastern part of the lake. This study will serve as a baseline for future water quality and sedimentation changes in Lake Tana. In particular, it might aid in explaining the spread of the water hyacinths.

show abstract

Section: Relationship With Lake Depthmentioning

confidence: 99%

Bottom Sediment Characteristics of a Tropical Lake: Lake Tana, Ethiopia

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In 1969, irrigated horticulture began and continued to expand until today, complemented by the installation of the Olkaria Geothermal Power Station in 1984 (e.g., Harper & Mavuti, 2004; Otiang’a‐Owiti & Oswe, 2007; Stoof‐Leichsenring et al, 2011). As a consequence of its heavy use, Lake Naivasha is beset by severe problems such as introduced alien species, declining fisheries, and lake‐level decline caused by water abstraction for agricultural use (Harper & Mavuti, 2004; Odongo et al, 2019; Olando et al, 2020). This situation also affects lake levels at Sonachi because of their hydrological connection.…”

Section: Methodsmentioning

confidence: 99%

Sedimentary ancient DNA of rotifers reveals responses to 200 years of climate change in two Kenyan crater lakes

et al. 2023

View full text Add to dashboard Cite

Sedimentary ancient DNA (sedaDNA) has proven to be a useful tool for palaeoenvironmental studies, but only a handful of studies exist so far for tropical regions. In this study we used sedaDNA to study the temporal succession of Brachionus spp. rotifer mitochondrial DNA haplotypes using two sediment cores from two climatically different alkaline‐saline crater lakes from the Kenyan Rift Valley. Data were retrieved from a sediment core (dating back to AD 1800) from Lake Kageinya, located in the remote, hot and hyper‐arid Suguta Valley. sedaDNA was used to study the temporal succession of mitochondrial DNA haplotypes of Brachionus spp. rotifers. The results were compared to previously published data from Lake Sonachi, a well‐studied lake in the humid and colder mountainous region of Kenya near the town of Naivasha, now supported by a 210Pb age chronology. Both records extend back before the onset of substantial anthropogenic impact in these regions. The results revealed that climate—rather than anthropogenic impact—was most strongly correlated with haplotype changes in both lakes. During prolonged dry periods (such as from AD 1910 to the late AD 1960s), certain haplotypes persisted. Sudden changes and the emergence of alter native haplotypes were observed when climate became more humid or during episodes of highly variable climate (before AD 1910 and from AD 1960s onwards). Progressive changes in prevailing haplotypes during periods with variable climate could reflect local adaptation and/or be the result of immigration of new haplotypes after the eradication of previous populations during extreme environmental conditions (high temperatures, UV irradiation, pH and salinity). The results indicate that, despite adverse chemical conditions, sedaDNA in tropical lake sediments is preserved for at least a few hundred years. Therefore, its analysis provides a useful complementary palaeoenvironmental proxy for palaeolimnological reconstructions and novel insights on changes in rotifer populations through time.

show abstract

“…Particularly, Cr, Cu, and Cd datasets include 2, 4, and 1 outlier, respectively. The analysis showed that Cr outliers occurred in Lakes Bierzwnik (5) and Piaseczno Duze (42), Cu in Lakes Dlugie Wigierskie (12), Kamienny Most (24), Lubosz Wielki (33), and Wielkie (70), and Cd in Lake Trzebun (65).…”

Section: Variability Of Hm Concentrations In Surface Sediments Of Lak...mentioning

confidence: 99%

“…Dominant sources of HMs differ at the continental scale. In Africa, the dominant source of HMs is bedrock weathering, in North America mining and industry, and in Asia and Europe domestic wastewaters 11 .According to the latest study results, sediments are dominated by elements primarily originating from anthropogenic sources [12][13][14] . Many studies show that industrial sources generally have the greatest impact on HMs pollution 15 .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Heavy metals in lake surface sediments in protected areas in Poland: concentration, pollution, ecological risk, sources and spatial distribution

Sojka

Jaskuła

Barabach

et al. 2022

Sci Rep

View full text Add to dashboard Cite

This paper presents the state and spatial distribution of surface sediment contamination of 77 lakes in Poland by Cr, Ni, Cd, Pb, Zn, and Cu. The analyzed lakes were located within a network of nature protection areas in the territory of the European Union (EU). Spatial distribution of the heavy metals (HMs), factors favoring the delivery/accumulation of HMs in surface sediments, and pollution sources were analyzed. The results indicate the contamination of lake sediments by HMs, but the potentially toxic effects of HMs are only found in single lakes. The spatial distribution of Cr indicates predominant impacts of point sources, while for Pb, Ni, and Zn, the impact of non-point sources. The analysis showed the presence of areas with very high values of particular HMs (hot spots) in the western part of Poland, while a group of 5 lakes with very low values of Ni, Pb, and Zn (cold spots) was identified in the central part of Poland. Principal component analysis showed that presence of wetlands is a factor limiting HMs inflow to lakes. Also, lower HMs concentrations were found in lake surface sediments located in catchments with a higher proportion of national parks and nature reserves. Higher HMs concentrations were found in lakes with a high proportion of Special Protection Areas designated under the EU Birds Directive. The positive matrix factorization analysis identified four sources of HMs. High values of HMs concentrations indicate their delivery from industrial, urbanized, and agricultural areas. However, these impacts overlap, which disturbs the characteristic quantitative profiles assigned to these pollution sources.

show abstract

Heavy metals in surface sediments of Lake Naivasha, Kenya: spatial distribution, source identification and ecological risk assessment

Cited by 21 publications

References 73 publications

Bottom Sediment Characteristics of a Tropical Lake: Lake Tana, Ethiopia

Bottom Sediment Characteristics of a Tropical Lake: Lake Tana, Ethiopia

Sedimentary ancient DNA of rotifers reveals responses to 200 years of climate change in two Kenyan crater lakes

Heavy metals in lake surface sediments in protected areas in Poland: concentration, pollution, ecological risk, sources and spatial distribution

Contact Info

Product

Resources

About