Phytoplankton primary productivity characteristics in response to photosynthetically active radiation in three Kenyan Rift Valley saline alkaline lakes

Oduor, Steve Omondi; Schagerl, Michael

doi:10.1093/plankt/fbm078

Cited by 74 publications

(43 citation statements)

References 42 publications

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“…The sampling point in L. Nakuru was in the central location at 00°21.387 0 S, 036°05.519 0 E. This point was chosen based on our preliminary observations which showed that it commonly hosts more Lesser Flamingos compared to the northern and southern parts of this lake. Also, due to the complete daily mixing of the lake, the data for physical and chemical variables collected from this point are representative of the whole lake (Oduor & Schagerl, 2007).…”

Section: Study Area and Sites Descriptionmentioning

confidence: 99%

“…These saline-alkaline lakes are renowned for their abundant phytoplankton biomass dominated by the cyanobacterium Arthrospira fusiformis (Voronichin) Komárek & Lund (formerly called Spirulina plantensis Voronichin), which is the main food source for these birds (Vareschi, 1978;Owino et al, 2001). Besides having high pH, these lakes are also characterised by high temperatures, limited light penetration and high conductivity (Oduor & Schagerl, 2007). These factors create an unfavourable environment for most phytoplankton species other than the few well adapted cyanobacteria taxa.…”

Section: Introductionmentioning

confidence: 99%

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A detailed time series assessment of the diet of Lesser Flamingos: further explanation for their itinerant behaviour

et al. 2012

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We hypothesised that changes in nutritional composition and quality of the pelagic phytoplankton community influence the occurrence of Lesser Flamingo populations in two Kenyan salinealkaline lakes, Nakuru and Bogoria. This was achieved by carrying out a detailed time series assessment of the phytoplankton community composition and nutritional components (carbohydrates, crude protein and lipids) from

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Section: Study Area and Sites Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A detailed time series assessment of the diet of Lesser Flamingos: further explanation for their itinerant behaviour

et al. 2012

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“…This yielded community grazing rates of 3.0 g C m 2 day -1 for L. Nakuru, reflecting comparatively high microzooplankton densities , and 0.8 C day -1 for L. Bogoria, which had average to low densities at the sampling date. If community grazing is related to the average daily gross primary production rates of the two lakes (Oduor & Schagerl, 2007a), then rotifers and large ciliates consumed 45 and 17% of the daily autotrophic production of L. Nakuru and L. Bogoria, respectively. Overall, we identified three different effects of the large microzooplankton on plankton communities: a negative one on large phytoplankton and small ciliates because of direct grazing, a neutral effect on HNF and picophytoplankton because microzooplankton consumption compensates reduced grazing pressure by small ciliates and finally a positive effect on heterotrophic bacteria (\1 lm).…”

Section: Discussionmentioning

confidence: 99%

“…In shallow tropical lakes and especially in alkalinesaline (soda) lakes, phytoplankton communities are frequently dominated by large forms (Lewis, 1978;Fernando, 1994;Oduor & Schagerl, 2007a). This leads to an overlap in size between herbivorous grazers and phytoplankton (Vareschi & Jacobs, 1985;Work et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Microzooplankton feeding behaviour: grazing on the microbial and the classical food web of African soda lakes

2012

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We investigated the feeding behaviour of the dominant microzooplankton of saline lakes in the East African Rift Valley. A set of grazing experiments revealed high ingestion rates of the two euryhaline rotifers Brachionus dimidiatus and Brachionus plicatilis and of the large-sized omnivorous ciliates Frontonia sp. and Condylostoma magnum reflecting the unique nature of tropical saline systems. The size spectrum of ingested particles was broad and even included filamentous cyanobacteria such as the commonly dominating Arthrospira fusiformis. Feeding selectivity on cyanobacteria, however, was rather low showing higher values for cryptomonads and small ciliates. Bacterial biomass was favoured by the presence of grazers, as small bacterivorous predators were reduced at an average of 13.9%, showing the cascading effect of large zooplankton on the food web structure. Overall, based on this first-time study of the microzooplankton feeding behaviour in East African soda lakes, a strong structuring effect of rotifers and large ciliates on microbial plankton communities is assumed, especially in times of high consumer biomass.

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“…A particularly prominent episode of bleached scum followed by low biomass was observed in mid 2004, which coincided with a major A. fusiformis die-off event (Oduor and Schagerl, 2007a).…”

Section: Timeseries Of Lake Classesmentioning

confidence: 98%

Regional assessment of lake ecological states using Landsat: A classification scheme for alkaline–saline, flamingo lakes in the East African Rift Valley

Tebbs

Remedios

Avery

et al. 2015

International Journal of Applied Earth Observation and Geoinfor

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Article (refereed) -postprintTebbs, E.J.; Remedios, J.J.; Avery, S.T.; Rowland, C.S.; Harper, D.M. 2015. Regional assessment of lake ecological states using Landsat: a classification scheme for alkaline-saline, flamingo lakes in the East African Rift Valley.Contact CEH NORA team at noraceh@ceh.ac.ukThe NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. AbstractIn situ reflectance measurements and Landsat satellite imagery were com- situ measurements. Classified imagery and timeseries were produced for selected lakes, which show the different ecological behaviours of these complex systems. The results have highlighted the importance to flamingos of the food resources offered by the extremely remote Lake Logipi. This study has demonstrated the potential of high spatial resolution, low spectral resolution sensors for providing ecologically valuable information at a regional scale, for alkaline-saline lakes and similar hypereutrophic inland waters.

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Phytoplankton primary productivity characteristics in response to photosynthetically active radiation in three Kenyan Rift Valley saline alkaline lakes

Cited by 74 publications

References 42 publications

A detailed time series assessment of the diet of Lesser Flamingos: further explanation for their itinerant behaviour

A detailed time series assessment of the diet of Lesser Flamingos: further explanation for their itinerant behaviour

Microzooplankton feeding behaviour: grazing on the microbial and the classical food web of African soda lakes

Regional assessment of lake ecological states using Landsat: A classification scheme for alkaline–saline, flamingo lakes in the East African Rift Valley

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