Grazer-induced colony formation in Scenedesmus: Are there costs to being colonial?

Miquel Lürling*, Ellen Van Donk

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

97 Citations (Scopus)


Grazer-induced colony formation in the common green alga Scenedesmus acutus may be interpreted as an anti-grazer defense. Costs are to be expected because otherwise the protected colonial morph would be the norm. Analysis of growth rates, light harvesting in terms of photosystem II (PSII) efficiency using Xe-PAM fluorescence measurements and sedimentation rates were compared among unicellular and induced colonial populations. No differences in growth rates and PSII efficiency were detected between unicellular and colonial populations. However, colonial populations had higher settling velocities than unicellular populations. Hence, costs may be attributed to enhanced sinking out of the euphotic zone resulting in reduced growth due to lower light and temperature in deeper water layers.

Original languageEnglish
Pages (from-to)111-118
Issue number1
Publication statusPublished - Jan 2000
Externally publishedYes

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