Can tropical freshwater zooplankton graze efficiently on cyanobacteria?

被引:80
作者
Ka, Samba [2 ,3 ]
Mendoza-Vera, Juana Mireya [1 ]
Bouvy, Marc [4 ]
Champalbert, Gisele [1 ]
N'Gom-Ka, Rose [5 ]
Pagano, Marc [1 ]
机构
[1] IRD UMR 213 LOPB Lab Oceanog Phys & Biogeochim, F-13288 Marseille 9, France
[2] Natl Taiwan Ocean Univ, Inst Marine Biol, Keelung 202, Taiwan
[3] Univ Cheikh Anta Diop, Inst Univ Peche & Aquaculture, Dakar 45784, Senegal
[4] Univ Montpellier 2, UMR 5119, CNRS IRD Ifremer, CC 093, F-34095 Montpellier 5, France
[5] IRD, LEMAR, UMR 6539, Dakar 1386, Senegal
关键词
Filamentous cyanobacteria; Copepods; Cladocerans; Rotifers; Top-down control; Freshwater; PSEUDODIAPTOMUS-HESSEI COPEPODA; HARMFUL ALGAL BLOOMS; ANABAENA-FLOS-AQUAE; BLUE-GREEN-ALGAE; TOP-DOWN CONTROL; MICROCYSTIS-AERUGINOSA; CALANOID COPEPODS; FILAMENTOUS CYANOBACTERIA; BRACHIONUS-CALYCIFLORUS; LIFE-HISTORY;
D O I
10.1007/s10750-011-0860-8
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Zooplankton may at times graze cyanobacteria. However, their top-down effects are considered to be low, particularly in tropical regions dominated by small-size grazers that may be unable to consume efficiently filamentous or colonial species. Recently, cyanobacteria blooms were reported in the Senegal River hydrosystem. We conducted feeding experiments to assess the ability of copepods (Pseudodiaptomus hessei and Mesocyclops ogunnus), cladocerans (Moina micrura and Ceriodaphnia cornuta), and rotifers (Brachionus angularis, B. falcatus, and Keratella sp.) to control different cyanobacteria (Cylindrospermopsis raciborskii, Anabaena solitaria, A. flos-aquae, and Microcystis aeruginosa). None of the zooplankton species ingested M. aeruginosa. Mesocyclops ogunnus did not consume any of the cyanobacteria. Both cladocerans consumed the smallest filaments of cyanobacteria, whereas all the rotifers and P. hessei consumed a broader food-size spectrum. The functional feeding responses suggest that the concentration and size of the filaments are not the sole criteria for food consumption. The high zooplankton community grazing rates, estimated by applying the clearance rates measured in the laboratory to the in situ zooplankton abundance, indicate that grazing by zooplankton potentially constitutes an important controlling factor for the filamentous cyanobacteria in the tropics.
引用
收藏
页码:119 / 138
页数:20
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