Whole-lake dissolved inorganic 13C additions reveal seasonal shifts in zooplankton diet

Ecology
Sami TaipaleR I Jones

Abstract

Sustained whole-lake additions of 13C-enriched dissolved inorganic carbon (DIC), intended to increase experimentally the delta13C of DIC in the epilimnion of a small lake with high dissolved organic carbon (DOC), were made during three seasonal periods (spring, summer, and autumn). Coupled with carbon and nitrogen stable isotope analysis of zooplankton and several of their putative food sources, these additions were used to investigate seasonal changes in the relative contributions of different food sources to zooplankton diet in the lake. Four main potential food sources were considered: phytoplankton, heterotrophic bacteria (HB), methanotrophic bacteria (MOB), and green sulfur bacteria (GSB). Because the number of potential food sources exceeded the number of isotopes analyzed, a computer program (IsoSource) was used to estimate the range of possible contributions of the various food sources. During all three periods the added inorganic 13C quickly increased the epilimnetic DIC delta13C by between 18 per thousand and 21 per thousand above the initial value of approximately -21 per thousand. This 13C enrichment of DIC was rapidly transmitted to the particulate organic matter (POM), which included photosynthetic phytoplankton. ...Continue Reading

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Citations

Mar 18, 2009·Journal of Experimental Botany·Andrew J ChallinorEvan Fraser
Feb 3, 2012·Proceedings. Biological Sciences·Brooks E MinerNelson G Hairston
Feb 13, 2016·Standards in Genomic Sciences·Anja PoehleinDiliana D Simeonova
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Jan 20, 2011·Proceedings of the National Academy of Sciences of the United States of America·Jonathan J ColeBrian Weidel
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Aug 12, 2016·Scientific Reports·Sami J TaipalePaula Kankaala
Dec 10, 2017·Antonie van Leeuwenhoek·M C MarinhoS C Antunes
Nov 14, 2015·Standards in Genomic Sciences·Anja PoehleinDiliana D Simeonova
Oct 29, 2017·The Science of the Total Environment·Frauke EckeBirger Hörnfeldt
Dec 27, 2021·The Science of the Total Environment·Clarisse C BlanchetPetri Nummi

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