Universität zu Köln

Werner, Christian, Ilic, Maja ORCID: 0000-0002-8387-9932 and von Elert, Eric ORCID: 0000-0001-7758-716X (2019). Differences in heat tolerance within a Daphnia magna population: the significance of body PUFA content. Hydrobiologia, 846 (1). S. 17 - 27. DORDRECHT: SPRINGER. ISSN 1573-5117

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Abstract

In this study, we use the model organism Daphnia magna to determine variation in heat tolerance within a natural population and relate this to variation in body fatty acid content and composition. As a proxy for heat tolerance we measured time to immobilization (T-imm) for 25 clonal lineages isolated from a single lake. The clonal lineages were grown on Chlamydomonas reinhardii at 15 degrees C. Upon deposition of the first clutch, T-imm and body fatty acids were determined. We report significant differences of T-imm and of the content of PUFAs and of eicosapentaenoic acid (EPA) among the D. magna clonal lineages. T-imm was negatively related to total PUFA-content, indicating that increased body PUFA-content may be detrimental for membrane properties at high temperatures. Juvenile somatic growth varied significantly among clonal lineages, and was not related to total body PUFA-content, hence body PUFA-content was no proxy for PUFA-limitation. No correlative evidence for an impact of body EPA-content on T-imm or juvenile growth was obtained. We hypothesize that the observed intra-population variability of body PUFA-content might be related to potentially different amplitudes in diel vertical migration in response to fish. These different amplitudes would mean differences in the extent of diurnal temperature fluctuations among the clonal lineages.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Werner, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Ilic, Maja UNSPECIFIED orcid.org/0000-0002-8387-9932 UNSPECIFIED von Elert, Eric UNSPECIFIED orcid.org/0000-0001-7758-716X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-125604
DOI:	10.1007/s10750-018-3769-7
Journal or Publication Title:	Hydrobiologia
Volume:	846
Number:	1
Page Range:	S. 17 - 27
Date:	2019
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1573-5117
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Biology > Zoologisches Institut
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLYUNSATURATED FATTY-ACIDS; CLIMATE-CHANGE; PRIMARY PRODUCERS; TEMPERATURE ADAPTATION; EICOSAPENTAENOIC ACID; SEASONAL SUCCESSION; THERMAL TOLERANCE; LIPID-COMPOSITION; PREDATOR EVASION; GENE-EXPRESSION Multiple languages Marine & Freshwater Biology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12560