Universität zu Köln

Klintworth, Sandra and Von Elert, Eric (2020). Risk of predation alters resource allocation in Daphnia under food limitation. J. Plankton Res., 42 (1). S. 45 - 57. OXFORD: OXFORD UNIV PRESS. ISSN 1464-3774

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Abstract

Life-history theory predicts that animals adjust their resource allocation to somatic growth or to reproduction to maximize fitness. Resource allocation in Daphnia is known to respond to quantitative food limitation as well as to kairomones released from predators. Here we investigated in a full-factorial design how kairomone from larvae of Chaoborus flavicans, a gape-limited predator, and food quantity (0.5 mg C/L versus 1.5 mg C/L) affect the fatty acid allocation of D. pulex. Low food diminished somatic growth, clutch size and clutch biomass and increased neckteeth formation in response to the kairomone. Low food further led to increased fatty acid amounts per individual egg as well as to increased fatty acid content in eggs and to increased relative fatty acid allocation to reproduction. The latter effect was suppressed by kairomone of Chaoborus, whereas on high food the provision of eggs was further enhanced. We also found that more eicosapentaenoic acid was retained in the body of mothers in the presence of the predator at low food concentrations. These findings indicate that under food limitation and in the presence of kairomone from Chaoborus larvae, Daphnia switches from allocation into current reproduction to investment into future reproductive events.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Klintworth, Sandra UNSPECIFIED UNSPECIFIED UNSPECIFIED Von Elert, Eric UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-351326
DOI:	10.1093/plankt/fbz074
Journal or Publication Title:	J. Plankton Res.
Volume:	42
Number:	1
Page Range:	S. 45 - 57
Date:	2020
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1464-3774
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLYUNSATURATED FATTY-ACIDS; LIFE-HISTORY SHIFTS; PHENOTYPIC PLASTICITY; CHAOBORUS; PULEX; GROWTH; COSTS; MAGNA; KAIROMONE; QUALITY Multiple languages Marine & Freshwater Biology; Oceanography Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/35132