Document of bibliographic reference 1136

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Ingestion rates of Daphnia magna Straus (Crustacea: Branchiopoda: Anomopoda) on bacterioplankton and phytoplankton in an aerated waste stabilisation pond

Abstract

The impact of zooplankton on waste stabilisation pond (WSP) performance has been poorly studied until now. Zooplankton grazing activity is, however, worth considering as it can control the bacterioplankton and phytoplankton, which are the cornerstone organisms of the WSP treatment technology. The aim of the present study was to determine whether the grazing activity of the dominant zooplankter, Daphnia magna, can significantly control phytoplankton and bacterioplankton in a WSP (Differange, Grand-Duchy of Luxembourg). The biomass of phytoplankton (B_phyto), bacterioplankton (B_bact) and Daphnia magna (B_Daphnia) were estimated fortnightly from January to July 1998. At four key moments during this period, the ingestion rates of phytoplankton (IR _phyto) and bacterioplankton (IR _bact) by D. magma were determined and compared to B_Phyto and primarily production (P_prim), and to Bbact and bacterial production (P_bact), respectively. From January to June, IR_Phyto varied between 66 and 92% of B_phyto.day^-1 and 310% of P_prim, causing a significant drop in B_phyto. The grazing impact of D.magma on bacterioplankton varied between 0.1 and 18% of B_bact.day^-1 and between 0.8 and 226% of P_bact. Even when higher than 100% of P_bact, the grazing impact did not lead to a significant decrease of B_bact, because of a significant input of allochtonous bacterial biomass with the influent.

Bibliographic citation

Cauchie, H.-M.; Hoffmann, L.; Thomé, J.-P. (1999). Ingestion rates of Daphnia magna Straus (Crustacea: Branchiopoda: Anomopoda) on bacterioplankton and phytoplankton in an aerated waste stabilisation pond. Belg. J. Zool. 129(1): 285-304

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true