Universität zu Köln

Effertz, Christoph and von Elert, Eric ORCID: 0000-0001-7758-716X (2017). Coupling of anti-predator defences in Daphnia: the importance of light. Hydrobiologia, 798 (1). S. 5 - 14. DORDRECHT: SPRINGER. ISSN 1573-5117

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Abstract

Here we test for the possible coupling of two kairomone-induced, anti-fish defences in Daphnia, life-history changes (LHC) and diel vertical migration (DVM) mediated by the environmental factor light. A gradient of five different light intensities that represents naturally occurring intensities in the lake water column was used in life-history experiments, and we show that LHC of a single Daphnia clone are inversely coupled to the ambient light intensity. Furthermore, we could show that the light intensity has to exceed a threshold to induce the LHC. We also observed an effect of the light intensity on the fish kairomone-mediated expression of a candidate gene (actin 3) in a way that the gene response differs between groups of low and high light intensities. We argue that the ambient light intensity an individual is exposed to and that is dependent on the position in the water column of a lake inversely determines the degree of LHC. These findings suggest a plastic coupling of these two anti-fish defences in Daphnia (LHC and DVM), which allows for an adjustment to fluctuating environments of standing freshwater ecosystems.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Effertz, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED von Elert, Eric UNSPECIFIED orcid.org/0000-0001-7758-716X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-220752
DOI:	10.1007/s10750-015-2387-x
Journal or Publication Title:	Hydrobiologia
Volume:	798
Number:	1
Page Range:	S. 5 - 14
Date:	2017
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1573-5117
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DIEL VERTICAL MIGRATION; PRELIMINARY CHEMICAL-CHARACTERIZATION; LIFE-HISTORY; BEHAVIOR; MAGNA; ZOOPLANKTON; FISH; PLASTICITY; KAIROMONES; ANIMALS Multiple languages Marine & Freshwater Biology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22075