Ambient temperature and algal prey type affect essential fatty acid incorporation and trophic upgrading in a herbivorous marine copepod
| Autor: | Suzanne M. Budge, Laura Helenius, Heather Nadeau, Catherine Johnson |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Food Chain Hot Temperature Docosahexaenoic Acids Calanus finmarchicus 01 natural sciences General Biochemistry Genetics and Molecular Biology Copepoda 03 medical and health sciences Nutrient Essential fatty acid Phytoplankton Animals 14. Life underwater Food science 030304 developmental biology Trophic level chemistry.chemical_classification Diatoms 0303 health sciences biology Fatty Acids Essential Chemistry 010604 marine biology & hydrobiology fungi Dinoflagellate food and beverages Articles biology.organism_classification Diet Cold Temperature Thalassiosira weissflogii Eicosapentaenoic Acid Dinoflagellida General Agricultural and Biological Sciences Copepod |
| Zdroj: | Philos Trans R Soc Lond B Biol Sci |
| Popis: | The essential fatty acids (EFA) eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are critical nutrients for all organisms, and the temperature sensitivity of their trophic transfer in marine systems is of concern because of rising ocean temperatures. Laboratory-reared copepodites of the marine calanoid Calanus finmarchicus were used to test the effects of temperature (at 6°C, 12°C and increasing temperature stress) and prey type (the dinoflagellate Heterocapsa triquetra and the diatom Thalassiosira weissflogii ) on the extent and efficiency of dietary EPA and DHA incorporation from phytoplankton to copepods in a set of feeding experiments using 13 C labelling. Temperature was a significant determinant of C . finmarchicus copepodites' EFA incorporation and gross growth efficiency, defined as the fraction of ingested EFA retained in copepod tissue. Ingestion and incorporation of both EFA were higher at warmer temperature, except in the case of DHA in copepods feeding on diatoms. DHA-associated growth efficiency was higher at the higher temperature for copepodites consuming the dinoflagellate, but temperature-related variation in algal EFA content was also a predictive factor. Moreover, our results strongly suggest that copepodites are capable of synthesizing EPA when consuming an EPA-depleted diet. Our study implies that the copepod link of marine food webs is resilient in terms of EFA transfer when confronted with alterations of ambient temperature and prey type availability. Measurements presented here are critical for estimating how EFA transfer dynamics respond to intra- and interannual environmental variability. This article is part of the theme issue ‘The next horizons for lipids as ‘trophic biomarkers’: evidence and significance of consumer modification of dietary fatty acids’. |
| Databáze: | OpenAIRE |
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