Observations on the limnology and phytoplankton community of crater Lake Kyaninga (Uganda), with special attention to its diatom flora

Cocquyt, C.; Plisnier, Pierre-Denis; Gelorini, V.; Rumes, B.; Verschuren, D.

doi:10.5091/plecevo.2010.420

Article (Scientific journals)

Observations on the limnology and phytoplankton community of crater Lake Kyaninga (Uganda), with special attention to its diatom flora

Cocquyt, C.; Plisnier, Pierre-Denis; Gelorini, V. et al.

2010 • In Plant Ecology and Evolution, 143 (3), p. 365 - 377

Peer reviewed

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https://hdl.handle.net/2268/294760

DOI
10.5091/plecevo.2010.420

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Keywords :

Africa; Crater lakes; Diatoms; Lake dynamics; Phytoplankton; Uganda; Bacillariophyta; Chlorophyta; Cyanobacteria; Nitzschia

Abstract :

[en] Background and aims - With a depth of at least 220 m, Lake Kyaninga is the deepest known maar crater lake in western Uganda. We studied its limnology and phytoplankton community to determine how the frequency and depth of water-column mixing influences nutrient cycling and seasonality in this aquatic ecosystem. Methods - Water-column temperature was measured continuously during a full annual cycle between August 2007 and August 2008. Other physical and chemical variables as well as diatom and other phytoplankton communities were investigated on three occasions, namely during the dry season in August of 2007 and 2008, and during the main wet season in April 2009. Key results and conclusions - The water column of Lake Kyaninga is permanently stratified (meromictic) below ~ 100 m depth. Above this depth, mixing frequency varies from daily (down to 8-12 m depth) over at least once per year (down to 39-47 m depth), to once in several years or decades (between 39-47 and ~ 100 m depth). Nutrient and chlorophyll concentrations as well as phytoplankton data classify the lake as low in aquatic productivity (oligotrophic). Its pelagic, open-water phytoplankton community is dominated by Cyanobacteria (blue-green algae) and Chlorophyta (green algae). Bacillariophyta (diatoms) contribute only a minor part of total phytoplankton biomass in both wet and dry seasons, and are characterized by an assemblage of small Nitzschia species. Epiphytic and epipelic diatoms are relatively few, because steep rocky crater slopes limit the littoral zone even though water-column transparency is high. The composition of recently deposited diatom assemblages preserved in offshore surface sediments gives a good, annually integrated representation of the present-day pelagic diatom community. The documented species richness of the diatom flora of Lake Kyaninga is moderate with about 150 taxa. Only ~ 17% of these are biogeographically restricted to tropical Africa; and most of these belong to the genus Nitzschia. © 2010 National Botanic Garden of Belgium and Royal Botanical Society of Belgium.

Disciplines :

Aquatic sciences & oceanology

Author, co-author :

Cocquyt, C.; National Botanic Garden of Belgium, Domein van Bouchout, BE-1860 Meise, Belgium, Ghent University, Limnology Unit, K.L. Ledeganckstraat 35, BE-9000 Gent, Belgium

Plisnier, Pierre-Denis ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Chemical Oceanography Unit (COU) ; Royal Museum for Central Africa, Leuvensesteenweg 13, BE-3080 Tervuren, Belgium

Gelorini, V.; Ghent University, Limnology Unit, K.L. Ledeganckstraat 35, BE-9000 Gent, Belgium

Rumes, B.; Ghent University, Limnology Unit, K.L. Ledeganckstraat 35, BE-9000 Gent, Belgium

Verschuren, D.; Ghent University, Limnology Unit, K.L. Ledeganckstraat 35, BE-9000 Gent, Belgium

Language :

English

Title :

Observations on the limnology and phytoplankton community of crater Lake Kyaninga (Uganda), with special attention to its diatom flora

Publication date :

2010

Journal title :

Plant Ecology and Evolution

ISSN :

2032-3913

eISSN :

2032-3921

Publisher :

Nationale Plantentuin van België, Be

Volume :

143

Issue :

Pages :

365 - 377

Peer reviewed :

Peer reviewed

Available on ORBi :

since 17 September 2022

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