KNAW Repository

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

Lürling, M. and Van Donk, E. (2000) Grazer-induced colony formation in Scenedesmus: are there costs to being colonial? Oikos, 88, 111-118. ISSN 0030-1299.

[img]PDF - Published Version
Restricted to KNAW only

283Kb

Official URL: http://dx.doi.org/10.1034/j.1600-0706.2000.880113.x

Abstract

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. [KEYWORDS: Morphological-changes; inducible defenses; crucian carp; green- algae; in-situ; phytoplankton; daphnia; chlorophyceae; sinking; growth]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:10891
Deposited On:24 Nov 2011 01:00
Last Modified:31 Mar 2014 10:29

Repository Staff Only: item control page