Distinguishing zooplankton fecal pellets as a component of the biological pump using compound‐specific isotope analysis of amino acids Article Swipe
Shannon C. Doherty
,
Amy E. Maas
,
Deborah K. Steinberg
,
Brian N. Popp
,
Hilary G. Close
·
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.1002/lno.11793
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.1002/lno.11793
Zooplankton contribute a major component of the vertical flux of particulate organic matter to the ocean interior by packaging consumed food and waste into large, dense fecal pellets that sink quickly. Existing methods for quantifying the contribution of fecal pellets to particulate organic matter use either visual identification or lipid biomarkers, but these methods may exclude fecal material that is not morphologically distinct, or may include zooplankton carcasses in addition to fecal pellets. Based on results from seven pairs of wild‐caught zooplankton and their fecal pellets, we assess the ability of compound‐specific isotope analysis of amino acids (CSIA‐AA) to chemically distinguish fecal pellets as an end‐member material within particulate organic matter. Nitrogen CSIA‐AA is an improvement on previous uses of bulk stable isotope ratios, which cannot distinguish between differences in baseline isotope ratios and fractionation due to metabolic processing. We suggest that the relative trophic position of zooplankton and their fecal pellets, as calculated using CSIA‐AA, can provide a metric for estimating the dietary absorption efficiency of zooplankton. Using this metric, the zooplankton examined here had widely ranging dietary absorption efficiencies, where lower dietary absorption may equate to higher proportions of fecal packaging of undigested material. The nitrogen isotope ratios of threonine and alanine statistically distinguished the zooplankton fecal pellets from literature‐derived examples of phytoplankton, zooplankton biomass, and microbially degraded organic matter. We suggest that δ 15 N values of threonine and alanine could be used in mixing models to quantify the contribution of fecal pellets to particulate organic matter.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1002/lno.11793
- OA Status
- hybrid
- Cited By
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- References
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All OpenAlex metadata
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https://openalex.org/W3162754702Canonical identifier for this work in OpenAlex
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https://doi.org/10.1002/lno.11793Digital Object Identifier
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Distinguishing zooplankton fecal pellets as a component of the biological pump using compound‐specific isotope analysis of amino acidsWork title
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articleOpenAlex work type
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enPrimary language
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2021Year of publication
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2021-05-19Full publication date if available
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Shannon C. Doherty, Amy E. Maas, Deborah K. Steinberg, Brian N. Popp, Hilary G. CloseList of authors in order
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https://doi.org/10.1002/lno.11793Publisher landing page
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YesWhether a free full text is available
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hybridOpen access status per OpenAlex
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https://doi.org/10.1002/lno.11793Direct OA link when available
- Concepts
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Zooplankton, Pellets, Environmental chemistry, Chemistry, Organic matter, Isotope analysis, Particulates, Biology, Ecology, Organic chemistry, PaleontologyTop concepts (fields/topics) attached by OpenAlex
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34Total citation count in OpenAlex
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2025: 16, 2024: 4, 2023: 10, 2022: 4Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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| primary_location.version | publishedVersion |
| primary_location.raw_type | journal-article |
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| primary_location.raw_source_name | Limnology and Oceanography |
| primary_location.landing_page_url | https://doi.org/10.1002/lno.11793 |
| publication_date | 2021-05-19 |
| publication_year | 2021 |
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