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Fractionation of stable isotopes in the Arctic marine copepod Calanus glacialis: Effects on the isotopic composition of marine particulate organic ... of Experimental Marine Biology and Ecology]
Book Details
PublisherElsevier
ISBN / ASINB000RR97TG
ISBN-13978B000RR97T8
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MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Journal of Experimental Marine Biology and Ecology, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Fractionation of @d^1^3C and @d^1^5N between food, consumer, and faecal pellets was studied in the Arctic marine copepod Calanus glacialis Jaschnov, fed with isotopically distinct algal monocultures. Temporal variations in @d^1^3C and @d^1^5N of copepods that were fed ice algae and phytoplankton followed those of a control group consisting of starved animals. There were no significant trends in the @d^1^3C and @d^1^5N values of copepods that were starved for 42 days, suggesting that the isotopic composition of non-lipid body tissues is unaffected by the metabolic processes during prolonged periods of starvation. The stable isotopic composition of starved copepods therefore seems to reflect food consumed during the previous period of feeding and growth. Faecal pellets produced by feeding copepods were depleted in ^1^3C and ^1^5N by 6.3-11.2%% and 0.7-9.1%%, respectively, relative to the food ingested. These results indicate that faecal pellet production is an important pathway for the trophic fractionation of @d^1^3C, whereas other fractionation pathways, such as excretion of ammonia, may be relatively more important for @d^1^5N. The strong depletion of ^1^3C in faecal pellets compared to the food suggests that grazing by herbivorous copepods on primary production adds to the variability of @d^1^3C in marine particulate organic matter.
Description:
Fractionation of @d^1^3C and @d^1^5N between food, consumer, and faecal pellets was studied in the Arctic marine copepod Calanus glacialis Jaschnov, fed with isotopically distinct algal monocultures. Temporal variations in @d^1^3C and @d^1^5N of copepods that were fed ice algae and phytoplankton followed those of a control group consisting of starved animals. There were no significant trends in the @d^1^3C and @d^1^5N values of copepods that were starved for 42 days, suggesting that the isotopic composition of non-lipid body tissues is unaffected by the metabolic processes during prolonged periods of starvation. The stable isotopic composition of starved copepods therefore seems to reflect food consumed during the previous period of feeding and growth. Faecal pellets produced by feeding copepods were depleted in ^1^3C and ^1^5N by 6.3-11.2%% and 0.7-9.1%%, respectively, relative to the food ingested. These results indicate that faecal pellet production is an important pathway for the trophic fractionation of @d^1^3C, whereas other fractionation pathways, such as excretion of ammonia, may be relatively more important for @d^1^5N. The strong depletion of ^1^3C in faecal pellets compared to the food suggests that grazing by herbivorous copepods on primary production adds to the variability of @d^1^3C in marine particulate organic matter.
