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

Christine Cocquyt UGent, Pierre-Denis Plisnier, Vanessa Gelorini UGent, Bob Rumes UGent and Dirk Verschuren UGent (2010) PLANT ECOLOGY AND EVOLUTION. 143(3). p.365-377
abstract
Background and aims - With a depth of at least 220 in, 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 similar to 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 similar to 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 epipelie 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 similar to 17% of these are biogeographically restricted to tropical Africa; and most of these belong to the genus Nitzschia.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
lake dynamics, diatoms, crater lakes, CLASSIFICATION, Africa, phytoplankton, ALGAE, Uganda
journal title
PLANT ECOLOGY AND EVOLUTION
Plant Ecol. Evol.
volume
143
issue
3
pages
365 - 377
Web of Science type
Article
Web of Science id
000286649400012
ISSN
2032-3913
DOI
10.5091/plecevo.2010.420
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1260575
handle
http://hdl.handle.net/1854/LU-1260575
date created
2011-06-11 23:53:59
date last changed
2011-07-04 14:44:58
@article{1260575,
  abstract     = {Background and aims - With a depth of at least 220 in, 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 similar to 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 similar to 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 epipelie 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 similar to 17\% of these are biogeographically restricted to tropical Africa; and most of these belong to the genus Nitzschia.},
  author       = {Cocquyt, Christine and Plisnier, Pierre-Denis and Gelorini, Vanessa and Rumes, Bob and Verschuren, Dirk},
  issn         = {2032-3913},
  journal      = {PLANT ECOLOGY AND EVOLUTION},
  keyword      = {lake dynamics,diatoms,crater lakes,CLASSIFICATION,Africa,phytoplankton,ALGAE,Uganda},
  language     = {eng},
  number       = {3},
  pages        = {365--377},
  title        = {Observations on the limnology and phytoplankton community of crater Lake Kyaninga (Uganda), with special attention to its diatom flora},
  url          = {http://dx.doi.org/10.5091/plecevo.2010.420},
  volume       = {143},
  year         = {2010},
}

Chicago
Cocquyt, Christine, Pierre-Denis Plisnier, Vanessa Gelorini, Bob Rumes, and Dirk Verschuren. 2010. “Observations on the Limnology and Phytoplankton Community of Crater Lake Kyaninga (Uganda), with Special Attention to Its Diatom Flora.” Plant Ecology and Evolution 143 (3): 365–377.
APA
Cocquyt, C., Plisnier, P.-D., Gelorini, V., Rumes, B., & Verschuren, D. (2010). Observations on the limnology and phytoplankton community of crater Lake Kyaninga (Uganda), with special attention to its diatom flora. PLANT ECOLOGY AND EVOLUTION, 143(3), 365–377.
Vancouver
1.
Cocquyt C, Plisnier P-D, Gelorini V, Rumes B, Verschuren D. Observations on the limnology and phytoplankton community of crater Lake Kyaninga (Uganda), with special attention to its diatom flora. PLANT ECOLOGY AND EVOLUTION. 2010;143(3):365–77.
MLA
Cocquyt, Christine, Pierre-Denis Plisnier, Vanessa Gelorini, et al. “Observations on the Limnology and Phytoplankton Community of Crater Lake Kyaninga (Uganda), with Special Attention to Its Diatom Flora.” PLANT ECOLOGY AND EVOLUTION 143.3 (2010): 365–377. Print.