Universität zu Köln

Sikora, Anna B., Dawidowicz, Piotr ORCID: 0000-0001-8385-6215 and von Elert, Eric ORCID: 0000-0001-7758-716X (2014). Daphnia fed algal food grown at elevated temperature have reduced fitness. J. Limnol., 73 (3). S. 421 - 428. PAVIA: PAGEPRESS PUBL. ISSN 1723-8633

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Abstract

Lake water temperature is negatively correlated with fatty acids content and P:C ratio in green algae. Hence, elevated temperature may indirectly reduce the fitness of Daphnia due to induced decrease in algal food quality. The aim of this study was to test the hypotheses that quality of algal food decreases with increasing temperature of its culture and that large-bodied Daphnia are more vulnerable to the temperature-related deterioration of algal food quality than small-bodied ones. Laboratory life-table experiments were performed at 20 degrees C with large-bodied D. pulicaria and small-bodied D. cucullata fed with the green alga Scenedesmus obliquus, that had been grown at temperatures of 16, 24 or 32 degrees C. The somatic growth rates of both species decreased significantly with increasing algal culture temperature and this effect was more pronounced in D. pulicaria than in D. cucullata. In the former species, age at first reproduction significantly increased and clutch size significantly decreased with increasing temperature of algae growth, while no significant changes in these two parameters were observed in the latter species. The proportion of egg-bearing females decreased with increasing algal culture temperature in both species. The results of this study support the notion that the quality of algal food decreases with increasing water temperature and also suggest that small-bodied Daphnia species might be less vulnerable to temperature-related decreases in algal food quality than large-bodied ones.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sikora, Anna B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dawidowicz, Piotr UNSPECIFIED orcid.org/0000-0001-8385-6215 UNSPECIFIED von Elert, Eric UNSPECIFIED orcid.org/0000-0001-7758-716X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-452422
DOI:	10.4081/jlimnol.2014.898
Journal or Publication Title:	J. Limnol.
Volume:	73
Number:	3
Page Range:	S. 421 - 428
Date:	2014
Publisher:	PAGEPRESS PUBL
Place of Publication:	PAVIA
ISSN:	1723-8633
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLYUNSATURATED FATTY-ACIDS; LIFE-HISTORY VARIATION; NUTRIENT LIMITATION; PHOSPHORUS LIMITATION; SCENEDESMUS-OBLIQUUS; QUALITY; WATER; GALEATA; STOICHIOMETRY; CONSEQUENCES Multiple languages Limnology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/45242