TY  - JOUR
A1  - Marzetz, Vanessa
A1  - Koussoroplis, Apostolos-Manuel
A1  - Martin-Creuzburg, Dominik
A1  - Striebel, Maren
A1  - Wacker, Alexander
T1  - Linking primary producer diversity and food quality effects on herbivores: A biochemical perspective
JF  - Scientific reports
N2  - Biodiversity can strongly influence trophic interactions. The nutritional quality of prey communities and how it is related to the prey diversity is suspected to be a major driver of biodiversity effects. As consumer growth can be co-limited by the supply of several biochemical components, biochemically diverse prey communities should promote consumer growth. Yet, there is no clear consensus on how prey specific diversity is linked to community biochemical diversity since previous studies have considered only single nutritional quality traits. Here, we demonstrate that phytoplankton biochemical traits (fatty acids and sterols) can to a large extent explain Daphnia magna growth and its apparent dependence on phytoplankton species diversity. We find strong correlative evidence between phytoplankton species diversity, biochemical diversity, and growth. The relationship between species diversity and growth was partially explained by the fact that in many communities Daphnia was co-limited by long chained polyunsaturated fatty acids and sterols, which was driven by different prey taxa. We suggest that biochemical diversity is a good proxy for the presence of high food quality taxa, and a careful consideration of the distribution of the different biochemical traits among species is necessary before concluding about causal links between species diversity and consumer performance.
Y1  - 2017
U6  - https://doi.org/10.1038/s41598-017-11183-3
SN  - 2045-2322
VL  - 7
PB  - Nature Publ. Group
CY  - London
ER  - 
TY  - JOUR
A1  - Denoux, Clemence
A1  - Martin-Creuzburg, Dominik
A1  - Koussoroplis, Apostolos-Manuel
A1  - Perriere, Fanny
A1  - Desvillettes, Christian
A1  - Bourdier, Gilles
A1  - Bec, Alexandre
T1  - Phospholipid-bound eicosapentaenoic acid (EPA) supports higher fecundity than free EPA in Daphnia magna
JF  - Journal of plankton research
N2  - Nutrition bioassays in which polyunsaturated fatty acids (PUFA)-deficient diets were supplemented with free long-chain PUFA (>= C20) consistently revealed positive effects on somatic growth and fecundity of Daphnia. However, free PUFA are hardly available in natural diets. In general, PUFA are bound to other lipids, especially to phospholipids and triglycerides. Here, we evaluate the potential of free and phospholipid-bound dietary eicosapentaenoic acid (EPA) to support somatic growth and fecundity of Daphnia magna. In a growth experiment, supplementation of a C20 PUFA-deficient diet with free or phospholipid-bound EPA improved somatic growth rates of D. magna equally. However, the increase in fecundity was significantly more pronounced when phospholipid-bound EPA was provided. Free and phospholipid-bound EPA were provided in the same concentrations in our experiment, suggesting that the allocation to reproduction-related processes is affected differently by phospholipid-bound PUFA and free PUFA. Our finding stresses the need to consider the distribution of dietary PUFA in different lipid classes to gain a better understanding of how PUFA influence life history traits of Daphnids in the field.
KW  - Daphnia magna
KW  - food quality
KW  - phospholipids
KW  - polyunsaturated fatty acids
KW  - reproduction
KW  - somatic growth
KW  - trophic interactions
Y1  - 2017
U6  - https://doi.org/10.1093/plankt/fbx037
SN  - 0142-7873
SN  - 1464-3774
VL  - 39
SP  - 843
EP  - 848
PB  - Oxford Univ. Press
CY  - Oxford
ER  -