The relationship between nutrients and trophic-level biomass in turbid tropical ponds
Date
1998Author
Sarnelle, Orlando
Cooper, Scott D
Wiseman, Sheila
Mavuti, Kenneth M
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
The total phosphorus–algal biomass relationship from a set of turbid tropical ponds in Kenya was compared with predictions derived from surveys of temperate and subtropical lakes. Despite high concentrations of total phosphorus (TP) (up to 797 μg L–1) and inorganic turbidity (up to 800 mg L–1), the log–log relationship between algal biomass and TP was steeper than expected.
2. No evidence of nitrogen limitation was found at high TP, and total nitrogen (TN):TP ratios were higher than in lakes with similar TP levels studied previously. High TN:TP ratios may be a consequence of excretion by cattle into the ponds, a nutrient source characterized by a high ratio of available N to available P.
3. Despite extremely high turbidity, the ratio of mixed layer depth to euphotic depth was generally low because these ponds are shallow (≤ 2 m), and was not related to algal yield. A positive relationship was also found between TP and zooplankton biomass, and between TP and the density of the zooplanktivorous bug, Anisops. In contrast, no relationship was found between fish biomass and TP, algal biomass or zooplankton biomass
URI
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2427.1998.00332.x/fullhttp://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/37286
Citation
Freshwater Biology Volume 40, Issue 1, pages 65–75, August 1998Publisher
Department of Zoology, University of Nairobi, Nairobi, Kenya