Stable isotope and fatty acid markers in plankton assemblages of a saline lake: seasonal trends and future scenario
Germán A. Kopprio
Rubén J. Lara
Ana Martínez
Anna Fricke
Martin Graeve
Gerhard Kattner
Abstract
Plankton fractions from a saline lake in Argentina were studied using a combined trophic marker approach. A strong seasonality of biomarkers was characteristic for the different fractions, particularly the variations in the 18:4(n − 3) and 20:4(n − 3) fatty acids and the δ13C values. The primary production in the lake was mainly driven by diatoms, reflected by the close relation of δ13C, chlorophyll a and diatom fatty acid markers. The combined approach of δ13C and 20:4(n − 3) enabled processes in the lipid metabolism of the copepod Boeckella poopoensis to be inferred. The polyunsaturated fatty acid 22:6(n − 3) and the δ15N separated the trophic levels in this food web with copepods at higher trophic level. Nutritional stress and omnivory of B. poopoensis partially explained the δ15N variations in mesozooplankton. The δ15N signature was probably driven by cyanobacteria in the microplankton and by microbial processes in the nanoplankton fraction. Warmer temperatures may favour the saturation of microalgae fatty acids and the abundance of plankton groups richer in saturated fatty acids. The tendency to unsaturation in mesozooplankton at colder temperatures was probably influenced by diet and metabolic requirements. Future temperature increase and eutrophication-like processes may increase the importance of cyanobacterial and bacterial markers under climate change scenarios.
Kopprio G.A., Lara R.J., Martínez A., Fricke A., Graeve M. and Kattner G. (2015) Stable isotope and fatty acid markers in plankton assemblages of a saline lake: seasonal trends and future scenario. Journal of Plankton Research 37(3): 584-595. 10.1093/plankt/fbv023
@article{Kopprio2015,
Title = {Stable isotope and fatty acid markers in plankton assemblages of a saline lake: seasonal trends and future scenario},
Author = {Kopprio, Germán A. and Lara, Rubén J. and Martínez, Ana and Fricke, Anna and Graeve, Martin and Kattner, Gerhard},
Editor = {},
Journal = {Journal of Plankton Research},
Year = {2015},
Pages = {584-595},
Volume = {37},
Doi = {10.1093/plankt/fbv023},
Abstract = {Plankton fractions from a saline lake in Argentina were studied using a combined trophic marker approach. A strong seasonality of biomarkers was characteristic for the different fractions, particularly the variations in the 18:4(n − 3) and 20:4(n − 3) fatty acids and the δ13C values. The primary production in the lake was mainly driven by diatoms, reflected by the close relation of δ13C, chlorophyll a and diatom fatty acid markers. The combined approach of δ13C and 20:4(n − 3) enabled processes in the lipid metabolism of the copepod Boeckella poopoensis to be inferred. The polyunsaturated fatty acid 22:6(n − 3) and the δ15N separated the trophic levels in this food web with copepods at higher trophic level. Nutritional stress and omnivory of B. poopoensis partially explained the δ15N variations in mesozooplankton. The δ15N signature was probably driven by cyanobacteria in the microplankton and by microbial processes in the nanoplankton fraction. Warmer temperatures may favour the saturation of microalgae fatty acids and the abundance of plankton groups richer in saturated fatty acids. The tendency to unsaturation in mesozooplankton at colder temperatures was probably influenced by diet and metabolic requirements. Future temperature increase and eutrophication-like processes may increase the importance of cyanobacterial and bacterial markers under climate change scenarios.},
}
TY - JOUR
AU - Kopprio, Germán A.
AU - Lara, Rubén J.
AU - Martínez, Ana
AU - Fricke, Anna
AU - Graeve, Martin
AU - Kattner, Gerhard
TI - Stable isotope and fatty acid markers in plankton assemblages of a saline lake: seasonal trends and future scenario
T2 - Journal of Plankton Research
PY - 2015
SP - 584-595
VL - 37
DO - 10.1093/plankt/fbv023
AB - Plankton fractions from a saline lake in Argentina were studied using a combined trophic marker approach. A strong seasonality of biomarkers was characteristic for the different fractions, particularly the variations in the 18:4(n − 3) and 20:4(n − 3) fatty acids and the δ13C values. The primary production in the lake was mainly driven by diatoms, reflected by the close relation of δ13C, chlorophyll a and diatom fatty acid markers. The combined approach of δ13C and 20:4(n − 3) enabled processes in the lipid metabolism of the copepod Boeckella poopoensis to be inferred. The polyunsaturated fatty acid 22:6(n − 3) and the δ15N separated the trophic levels in this food web with copepods at higher trophic level. Nutritional stress and omnivory of B. poopoensis partially explained the δ15N variations in mesozooplankton. The δ15N signature was probably driven by cyanobacteria in the microplankton and by microbial processes in the nanoplankton fraction. Warmer temperatures may favour the saturation of microalgae fatty acids and the abundance of plankton groups richer in saturated fatty acids. The tendency to unsaturation in mesozooplankton at colder temperatures was probably influenced by diet and metabolic requirements. Future temperature increase and eutrophication-like processes may increase the importance of cyanobacterial and bacterial markers under climate change scenarios.
ER -
