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Cyanobacteria have often been described to be nutritionally inadequate and to interfere with zooplankton feeding. In laboratory experiments we offered 2 cyanobacteria, a unicellular Microcystis aeruginosa strain and the filamentous lVodiilaria spumigena, to the calanoid copepod Acartla tonsa as the sole diet and in food mixtures with the nutritious diatom Thalassiosira rveissflogii. Egg production was used as criterion of food quality. The use of cyanobacteria alone was an insuffic~ent d ~ e t . However, w ~ t h Increasing add~tlons of M. aeruginosa and N. spuniigena to the diatom, different effects were observed Large additions of cyanobacteria resulted In loi'ver egg production and often in elevated mortality of the fcmales, but small additions of M. aeruglnosa caused an Increase of about 2 5 " ~ ~ in e g g production compared to a pure diatom diet. The influence of s~milar low concentrations of h'. spumigena was weaker. M!e suppose that in the mixtures A. tonsa fed passively on M. aeruqinosa. but no1 on the filaments of N. spumigena. and that lngrstcd M. aeruginosa were used metabolicdlly. As an additional test of the positive interactions between M. aeruginosa and 7 weissf/ogji, different ratios of these species were offered to the copepods, while k e e p ~ n y the total food concentration constdnt. In mlxtures egg product~on was higher than expected from the proportion of T rvelssflogii. The highest egg production rates were observed at a 311 mixture of T rveissflogij to M . aeruginosa. We conclude that mono-specif~c food experiments may give a false impression of the nutrltlonal quality of phytoplankton species. Cyanobacteria, which when fed alone prove to be poor food, may supplement the diet of A. tonsa.

Nutritional quality of two cyanobacteria:How rich is 'poor' food?