Assessing water quality in lake Naivasha

Ndungu, J.N.

doi:10.3990/1.9789036537001

Cited by 7 publications

(20 citation statements)

References 178 publications

(224 reference statements)

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“…Naivasha (Egertson & Downing, 2004;Ndungu, 2014). Previous studies have also demonstrated significant effects of carp on water turbidity (Figure 5; Weber & Brown, 2009).…”

Section: Nutrients and Water Turbiditymentioning

confidence: 86%

“…The water temperature in Lake Naivasha ranges between 20°C and 23°C (Oyugi et al, 2011). The lake was once one of the most treasured tourist sites in the world because of its biodiversity richness, which led to its subsequent designation as a Ramsar site in 1995 (Ndungu, 2014). Lake Naivasha provides a source of fish, drinking and irrigation water, as well as non-fish benefits including food security, employment, community development, education, recreation, conservation and tourism (Hickley et al, 2015).…”

Section: Introduction Of Non-native Fish Species Into Lake Naivashamentioning

confidence: 99%

“…Redbelly tilapia (Coptodon zillii) was also introduced into Lake Naivasha in 1956 from the Lake Victoria Basin and has been exploited within a commercial gillnet fishery since its establishment (Hickley & Harper, 2002). It is an omnivore and often decreases the plant density, leading to a change in the native plant composition, which may threaten many of the aquatic organisms dependent on such plants for food, camouflage or breeding (Ndungu, 2014).…”

Section: Introduction Of Non-native Fish Species Into Lake Naivashamentioning

confidence: 99%

“…At the same time, however, invasive fish may only pose a potential ecological risk to an ecosystem if they are able to establish a self-sustaining population in the new habitat, thereby resulting in possible detrimental interactions (Gozlan et al, 2010;Gozlan & Newton, 2009). Successful invasive fish species often cause ecological problems in the new F I G U R E 1 Histogram of number of non-native freshwater fish introductions per sector for each Food and Agriculture Organization (FAO) region (data adapted from Gozlan, 2008) F I G U R E 2 Map of Lake Victoria Kenya (adapted from Ndungu, 2014Ndungu, , 2013 habitats through competition, predation, habitat alteration, hybridization and parasitism, thereby reducing the biomass of native species (Giannetto et al, 2012;Mutethya et al, 2020). In addition to ecological problems, invasive species may also cause economic losses, either directly or indirectly.…”

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confidence: 99%

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A comprehensive review of invasion and ecological impacts of introduced common carp (Cyprinus carpio) in Lake Naivasha, Kenya

Mutethya

Yongo

2021

Lakes & Reservoirs

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The motivations for non-native fish introductions vary around the globe, generally including aquaculture, aquarium use, sport fishing, stock enhancement and biological control, while some have been accidentally introduced (Lin et al., 2015). Aquaculture is generally the main driver for non-native fish introduction in most regions (Figure 1; Gozlan, 2008). The introduction of nonnative fish species has several benefits, including significant contributions to global aquaculture and enhancement of capture fisheries. At the same time, however, the ecological risks they pose to the recipient systems are not always assessed prior to their introduction or are not accurately predicted (Hickley et al., 2015). Some of the commonly introduced fish species, (e.g. Common carp; Nile tilapia; Mosquito fish; Nile perch; Brown trout; Rainbow trout; Largemouth bass) are listed worldwide as invaders (Gozlan, 2008).Invasive fish species are generally known to pose serious threats to aquatic biodiversity, being regarded as one of the main causes of native species endangerment and extinction (Attayde et al., 2011;

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“…Naivasha (Egertson & Downing, 2004;Ndungu, 2014). Previous studies have also demonstrated significant effects of carp on water turbidity (Figure 5; Weber & Brown, 2009).…”

Section: Nutrients and Water Turbiditymentioning

confidence: 86%

Section: Introduction Of Non-native Fish Species Into Lake Naivashamentioning

confidence: 99%

Section: Introduction Of Non-native Fish Species Into Lake Naivashamentioning

confidence: 99%

mentioning

confidence: 99%

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A comprehensive review of invasion and ecological impacts of introduced common carp (Cyprinus carpio) in Lake Naivasha, Kenya

Mutethya

Yongo

2021

Lakes & Reservoirs

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“…The data collected were analyzed using descriptive statistics, Spearman rank correlation and Principal Components Analysis (PCA) using PAST programme [16][17][18]. [19][20][21][22][23][24][25]. The three size-groups observed were 10-15.9 cm (28.6%), 16.0-19.9 cm (38.7%) and ≥ 20 cm (32.7%).…”

Section: Methodsmentioning

confidence: 99%

Relationship Between Physico-Chemical Parameters and Reproductive Indices of Parachanna obscura (Gunther 1861) in Eleyele Reservoir, Ibadan, Nigeria

An¹,

Ek²,

Ok³

et al. 2017

Eur J Exp Bio

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Propagation in fishes depends on the level of gonad maturation which could be influenced by environmental conditions. However, declining water quality due to environmental degradation has been identified as a hindrance to such ecosystem services in aquatic ecosystems. Therefore, size distribution and stages of gonad development of P. obscura in relation to physic-chemical parameters of Eleyele reservoir were studied. Samples of water and Parachanna obscura were collected monthly from five stratified sampling points and fishers catch, respectively for 24 months. Fish were grouped according to sizes (10-15.9, 16.0-19.9 and ≥ 20 cm), and gonads assessed for maturation. Relationship between reproductive indices and physic-chemical parameters were determined using Principal Component Analysis. The size-groups distributions were 10-15.9 cm (28.6%), 16.0-19.9 cm (38.7%) and ≥ 20 cm (32.7%). All the five maturation stages (I-V) were discerned in the female while only stages II-IV were observed in male samples. All the size groups showed strong associations with pH (β=0.346), ammonia (β=0.303) and temperature (β=0.161). Ovary development was significantly influenced by DO (β=0.827), TDS (β=0.777) and TS (β=0.813), while testes maturation was more influenced by temperature (β=0.626). This information will serve as guides for effective ecosystem management through the control of anthropogenic activities on this reservoir and similar water bodies to enhance resource conservation and/or sustainable management.

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Habitat quality–physicochemical water quality–littoral macroinvertebrate community nexus in Lugo Lake (Ethiopia): Priorities for sustainable water resources management

Woretaw

Dagne

Gizeyatu

et al. 2023

Water & Environment J

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The integration of water quality characteristics with habplot‐based habitat quality assessment score (HabQA) has received little attention in ecological quality assessment studies. This study investigated the macroinvertebrate community structure in relation with lake habitat quality and physicochemical water quality variables in Lugo Lake (Ethiopia). Twelve sampling sites (eight agricultural and four recreational) were included. The variation among macroinvertebrates data was significantly explained by HabQA score and soluble reactive phosphorus. The study revealed the greater importance of habitat quality characteristics in comparison with the other conventional physicochemical characteristics on macroinvertebrate community structure. We strongly recommend the use of HabQA system while studying macroinvertebrate community structure for a deeper understanding of the environmental functioning of tropical lakes. The results suggested the need to apply integrated and sustainable protection and management of the lake catchment (including wetlands) to enhance the ecological integrity and hence biodiversity of lakes.

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Assessing water quality in lake Naivasha

Cited by 7 publications

References 178 publications

A comprehensive review of invasion and ecological impacts of introduced common carp (Cyprinus carpio) in Lake Naivasha, Kenya

A comprehensive review of invasion and ecological impacts of introduced common carp (Cyprinus carpio) in Lake Naivasha, Kenya

Relationship Between Physico-Chemical Parameters and Reproductive Indices of Parachanna obscura (Gunther 1861) in Eleyele Reservoir, Ibadan, Nigeria

Habitat quality–physicochemical water quality–littoral macroinvertebrate community nexus in Lugo Lake (Ethiopia): Priorities for sustainable water resources management

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