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Production biology of copepods and cladocerans in three south- east Sri Lankan low-land reservoirs and its comparison to other tropical freshwater bodies

Amarasinghe, P.B. and Vijverberg, J. and Boersma, M. (1997) Production biology of copepods and cladocerans in three south- east Sri Lankan low-land reservoirs and its comparison to other tropical freshwater bodies. Hydrobiologia, 350, 145-162. ISSN 0018-8158.

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Official URL: http://dx.doi.org/10.1023/A:1003035831790

Abstract

Production, biomass and productivity of the microcrustacean zooplankton populations of three low-land reservoirs, Tissawewa (eutrophic), Ridiyagama (moderately eutrophic), and Muruthawela (mesotrophic) in South-east Sri Lanka were studied. The temporal variation of zooplankton production was studied in Tissawewa on basis of fortnightly sampling on five fixed sampling stations for 2 years. Zooplankton production was relatively high, mainly because of high copepod production predominantly realised due to two calanoid copepods, Phyllodiaptomus annae and Heliodiaptomus viduus. About half of the copepod production was contributed by the naupliar instar stages, whereas the contribution of the eggs was generally much smaller (<20%). In contrast, the cladoceran production consisted for ca 50-70% of egg production. The results of this study were compared with those from more than twenty other tropical and subtropical waterbodies reported in the literature by deriving empirical relationships between mean phytoplankton biomass and mean zooplankton biomass and production. Mean zooplankton biomass and annual zooplankton production were found to be positively related to mean phytoplankton biomass, and mean phytoplankton biomass proved to be a good predictor of mean zooplankton biomass (r(2) = 0.58) and a moderate good predictor of annual zooplankton production (r(2) = 0.43). However, the relationships between the mean phytoplankton biomass and zooplankton P/B were not significant neither for small-bodied and large-bodied cladocerans nor for copepods. [KEYWORDS: microcrustacean zooplankton; tropical limnology; biomass; production; empirical relationships Length-weight regressions; life-history consequences; lake nakuru kenya; crustacean zooplankton; dry-weight; population-dynamics; resource depression; consumer organisms; water zooplankton; cyclops-vicinus]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:10450
Deposited On:25 Nov 2011 01:00
Last Modified:31 Mar 2014 11:09

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