Temporal Variations of Water Quality Parameters, Phytoplankton, And Invertebrates In Environmental Change Hotspots: A Case of Lake Wamala, Uganda

  • Shamim Naigaga Auburn University
Keywords: Climate Change, Cyanobacteria, Eutrophication, Lake Wamala, Plankton Productivity


Lake Wamala (Uganda) is a small shallow lake (maximum mean depth = 4.5m) that has periodically undergone
fluctuations in depth and area because of changes in rainfall, temperature and wind speed. No study, however,
has been done to assess how these changes, in addition to catchment degradation, which are likely to intensify in future, have affected aquatic productivity processes. Data on Secchi depth (SD), turbidity, conductivity, dissolved oxygen (DO), total phosphorous (TP), soluble reactive phosphorus (SRP), soluble reactive silicon (SRSi), ammonia (NH4-N), nitrite nitrogen (NO2-N), nitrate nitrogen (NO3-N), Chlorophyl a, composition and abundance of algae, and invertebrates were compared between periods 1998-2000 and 2011-2013. Results showed a twofold increase in conductivity and TP, a threefold increase in SRSi, chlorophyll a > 25 ?g l-1, and persistence by low water transparency (SD < 0.7 m). In consequence, algal biomass increased by >70%, with emergence of new species, especially among the dinoflagellate and euglenophyte groups. Although rotifers, which are known to have capacity to withstand stressful habitat conditions, dominated the zooplankton, their density decreased by >80%. The phantom-midge, chaoborus, and the midge, chironomid, larvae dominated macro-invertebrate, but did not show clear trends between the two periods.


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Munday P. L., Jones G. P., Pratchett M. S. & Williams A. J. (2008) Climate change and the future for coral

reef fishes. Fish Fish. 9, 261-285

Pratchett M. S. & Berumen M. L. (2008) Interspecific variation in distributions and diets of coral reef

butterflyfishes (Teleostei: Chaetodontidae). J. Fish Biol. 73, 1730-1747.

Hecky R. E., Mugidde R., Ramlal P. S., Talbot M. R. & Kling G. W. (2010) Multiple stressors cause rapid

ecosystem change in Lake Victoria. Freshwater Biol. 55, 19-42.

Sitoki L., Gichuki J., Ezekiel C., Wanda F., Mkumbo O. C. & Marshall B. (2010) The Environment of Lake

Victoria (East Africa): Current Status and Historical Changes. Int. Rev. Hydrobiol. 95, 209-223.

Behrenfeld J. M., O’Malley T. R., Siegel A. D., McClain R. C., Sarmiento L. J., Feldman C. G., Milligan J. A.,

Falkowski G. P., Letelier M. R. & Boss, S. E. (2006) Climate-driven change in contemporary ocean

productivity. Nature 444, 752-755.

Behrenfeld M. (2011) Uncertain future for ocean algae. Nature 1, 33-34.

Beardall J. & Stojcovik S. (2006) Microalgae under global environmental change: Implications for growth

and productivity, populations and trophic flow. Science Asia 32, 1-10.

Hessen O. D. & Elser J. J. (2005) Elements of ecology and evolution. Oikos 109, 3-5.

Jochum M., Schneider D. F., Crowe P. T., Brose U. & O'Gorman J. E. (2012) Climate-induced changes in

bottom-up and top-down processes independently alter a marine ecosystem. Philos. Trans. R. Soc. Lond.

B 367, 2962-2970.

Kalista H. P. & Ulrich S. (2012) Phytoplankton Cell Size: Intra- and Interspecific Effects of Warming and

Grazing. PLoS One 7(11), e49632.

Marañón E., Cermeño P., Latasa M. & Tadonléké R. D. (2012) Temperature, resources, and phytoplankton

size structure in the ocean. Limnol. Oceanogr. 57, 1266–1278.

O’Reilly C. M., Alin S. R., Pilsnier P. D., Cohen A. S. & McKee, B. A. (2003) Climate change decreases aquatic

ecosystem productivity of Lake Tanganyika, Africa. Nature 424, 766–768.

Ndebele-Murisa M. R., Musil C. F. & Raitt L. M. (2012) Phytoplankton biomass and primary production

dynamics in Lake Kariba. Lakes Reserv. Res. Manage. 17, 275–289.

MacIntyre S., Romero J. R., Silsbe G. M. & Emery B. M. (2014) Stratification and horizontal exchange in

Lake Victoria, East Africa. Limnol. Oceanogr. 59, 1805–1838.

IPCC (2014) Climate Change 2014: The Physical science basis. IPCC, WG1

Natugonza V., Ogutu-Ohwayo R., Efitre J., Muyodi F., Mbabazi D., Olokotum M., Musinguzi L., Naigaga S.

& Namboowa S. (2015) The responses of Nile tilapia Oreochromis niloticus (Linnaeus, 1758) in Lake

Wamala (Uganda) to changing climatic conditions. Lakes Reserv. Res. Manage. 20, 101–119.

Journal of Advances in Agriculture Vol 10 (2019) ISSN: 2349-0837 https://rajpub.com/index.php/jaa

Barange M. & Perry R. I. (2009) Physical and ecological impacts of climate change relevant to marine and

inland capture fisheries and aquaculture. In: Climate change implications for fisheries and aquaculture:

overview of current scientific knowledge (eds K. Cochrane, C. De Young, D. Soto & T. Bahri) pp. 7–106.

FAO Fisheries and Aquaculture Technical Paper 530, Rome, Italy.

Hecky R. E. (1993) The eutrophication of Lake Victoria. Verh. Int. Ver. Theor. Angew. Limnol. 25, 39-48.

Mugidde R. (2001) Nutrient Status and Planktonic Nitrogen Fixation in Lake Victoria, Africa. Unpublished

PhD Thesis, University of Waterloo, Ontario, Canada.

MacDonald W.W. (1953) Lake-flies. Uganda Journal 17, 124-134.

Sekiranda S. B. K., Okot-Okumu J., Bugenyi F. W. B., Ndawula L. M., Gandhi P. (2004) Variations in

composition of macro-benthic invertebrates as an indication of water quality status in three bays in Lake

Victoria. UJAS. 9, 396-411

Verschuren D., Johnson T. C., Kling H. J., Edgington D. N., Leavitt P. R., Brown E. T., Talbot M. R., Hecky R.

E., (2002) The chronology of human impacts on Lake Victoria, East Africa. Proc. R. Soc. Lond. B. 269, 289-

UNEP (2009) Lake Wamala. Environmental Change Hotspots, Division of Early Warning and Assessment,

UNEP. http://na.unep.net/atlas/webatlas.php? Accessed 21 August 2014.

Goulden M. C. (2006) Livelihood diversification, social capital and resilience to climate variability among

natural resource dependant societies in Uganda. Unpublished PhD Thesis, University of East Anglia,

Norwich, UK.

Musinguzi L., Efitre J., Odongkara O. K., Ogutu-Ohwayo R., Muyodi F. J., Natugonza V., Olokotum M.,

Namboowa S. & Naigaga S. (2015) Fishers’ perceptions of climate change, impacts on their livelihoods

and adaptation strategies in environmental change hot spots: A case of Lake Wamala, Uganda.

Environment, Development and Sustainability DOI 10.1007/s10668-015-9690-6

Komutunga E. T. & Musiitwa F. (2001) Climate. In: Agriculture in Uganda (ed J. K. Mukiibi). Vol I. pp. 21–

Fountain Publ/ CTA/ NARO, Entebbe, Uganda.

Wetzel R. G. and G. E. Likens. 2000. Limnological analyses. Springer, New York, USA.

American Public Health Association, APHA (1995) Standard methods for the examination of Water and

Wastewater.19th Edition, Washington DC, USA.

Krom M. D. (1982) Spectrophotometric determination of ammonia: a study of a modified Bertholet

reaction using salicylate and dichlorisocyanurate. Analyst 105, 305-316.

Utermöhl H. (1958) The improvement of quantitative phytoplankton methodology. Verh. Int. Ver. Theor.

Angew. Limnol. 2, 1-38.

John D., Whitton M. B. A. & Brook A. J. (2002) The freshwater algal flora of the British Isles: an

identification guide to freshwater and terrestrial algae. Cambridge University Press, Edinburgh, UK.

Hillenbrand H., C. D. Durselen, D. Kirschtel, U. Pollingher and T. Zohary. 1999. Biovolume calculation for

pelagic and benthic microalgae. Journal of Phycology 35: 403-424.

Brooks J. L. (1957) The systematics of North American Daphnia. Mem. Conn. Acad. Arts Sci. 13, 1-18.

Pennak R. W. (1978). Freshwater invertebrates of the United States. Second Edition. John Wiley & Sons.

Pg. 803.

Mwebaza-Ndawula L. (1994) Changes in relative abundance of zooplankton in northern Lake Victoria,

East Africa. Hydrobiologia 272, 256–64.

De Moor I. J., Day J. A. & De Moor F. C. (2003) Freshwater invertebrates of South Africa. Vol. 8: Insect II.

Prepared for the Water Research Commission.

OECD (1982) Eutrophication of waters: Monitoring, assessment and control. Washington DC: OECD

publications and information centre, pp. 154.

Seitzinger S. P. (1988) Denitrification in freshwater and marine ecosystems: Ecological and geochernical

significance. Limnol.Oceanogr. 35, 702-724.

Gikuma-Njuru P. & Hecky R. E. (2005) Nutrient concentrations in Nyanza Gulf, Lake Victoria, Kenya: light

limits algal demand and abundance. Hydrobiologia 534, 131-140.

Talling J. F. (1966) The annual cycle of stratification and phytopl ankton growth in Lake Victoria (East

Africa). Int. Rev. Hydrobiol. 51, 545-621.

Hecky R. E., Bugenyi F. W. B., Ochumba P., Talling J. F., Mugidde R., Gophen M. & Kaufman L. (1994)

Deoxygenation of the deep water of Lake Victoria, East Africa. Limnol. Oceanogr. 39, 1476-1481.

Park S., Brett M. T., Müller-Solger A. & Goldman C. R. (2004) Climatic forcing and primary productivity in a

subalpine lake: Inter-annual variability as a natural experiment. Limnol. Oceanogr. 49, 614-619.

Sitoki L., Kurmayer R. & Rott E. (2012) Spatial variation of phytoplankton composition, biovolume, and

resulting microcystin concentrations in the Nyanza Gulf (Lake Victoria, Kenya). Hydrobiologia 691, 109–

Paerl H. W. & Huisman J. (2009) Climate change: a catalyst for global expansion of harmful cyanobacterial

blooms. Environ. Microbiol. Rep. 1, 27–37.

Poste A. E., Hecky R. E. & Guildford S. J. (2013) Phosphorus enrichment and carbon depletion contribute

to high Microcystis biomass and microcystin concentrations in Ugandan lakes. Limnol Oceanogr 58,


Tasevska O., Jersabek C. D., Kostoski G. & Guseska D. (2012) Differences in rotifer communities in two

freshwater bodies of different trophic degree (Lake Ohrid and Lake Dojran, Macedonia). Biologia 67, 565-

Lazzaro X. (1997) Do the trophic cascade hypothesis and classical biomanipulation approaches apply to

tropical lakes and reservoirs? Verh. Int. Ver. Theor. Angew. Limnol. 26, 719-730.

Yildiz S., Altindag A. & Ergonul M. B. (2007) Seasonal fluctuations in the zooplankton composition of a

eutrophic lake: Lake Marmara (Manisha, Turkey). Turk. J. Zool. 31, 26-121.

Walshe B. M., (1950) The function of haemoglobin in Chironomus plumosus under natural conditions. J.

Exp. Biol. 27, 73-95.

How to Cite
Naigaga, S. (2019). Temporal Variations of Water Quality Parameters, Phytoplankton, And Invertebrates In Environmental Change Hotspots: A Case of Lake Wamala, Uganda. JOURNAL OF ADVANCES IN AGRICULTURE, 10, 1800-1820. https://doi.org/10.24297/jaa.v10i0.8396