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Anim Behav

Title:		Light-induced migration behaviour of Daphnia modified by food and predator kairomones
Author(s):		Van gool E; Ringelberg J;
Address:		"Department of Aquatic Ecology, University of Amsterdam, The Netherlands"
Journal Title:		Anim Behav
Year:		1998
Volume:		56
Issue:		3
Page Number:		741 - 747
DOI:		10.1006/anbe.1998.0821
ISSN/ISBN:		0003-3472 (Print) 0003-3472 (Linking)
Abstract:		"Lake-dwelling waterfleas, Daphnia, often face a dilemma. Food availability is highest, near the water surface, but predation by visually hunting predators is also most severe. Swimming downward at dawn reduces predation risk, but food availability and temperature also decrease with depth. We tested whether Daphnia process information derived from food and predator presence to estimate the costs and benefits of migration, and to determine when it pays to swim down. We studied downward swimming of D. galeataxhyalina in response to stepwise accelerations of relative increases in the intensity of light at several food and fish kairomone concentrations. Both had a modifying, additive, although independent effect. We studied in six clones the clonal differences of this environmentally induced plasticity of photobehaviour. These clones were caught at two depths at noon during a period of vertical migration in Lake Maarsseveen (the Netherlands), and so presumably differed in vertical migration behaviour. Two clones, one from the epilimnion and one from the hypolimnion, showed a particularly significant difference in migration behaviour. Copyright 1998 The Association for the Study of Animal Behaviour"
Keywords:
Notes:		"PubMed-not-MEDLINEVan gool E Ringelberg, J eng England 1998/12/16 Anim Behav. 1998 Sep; 56(3):741-747. doi: 10.1006/anbe.1998.0821"