Estimates of primary production sources to Arctic bivalves using amino acid stable carbon isotope fingerprinting
Thesis (M.S.) University of Alaska Fairbanks, 2018 Benthic invertebrates are a crucial trophic link in Arctic marine food webs. However, estimates of the contribution of primary production sources sustaining these organisms are not well characterized. Potential sources could include sinking particul...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/10338 2023-05-15T14:53:11+02:00 Estimates of primary production sources to Arctic bivalves using amino acid stable carbon isotope fingerprinting Rowe, Audrey G. Wooller, Matthew Iken, Katrin O'Brien, Diane 2018-12 http://hdl.handle.net/11122/10338 en eng http://hdl.handle.net/11122/10338 Department of Marine Biology macoma astartidae Chukchi Sea Arctic regions bivalves benthic animals phytoplankton marine bacteria productivity primary productivity amino acids Thesis ms 2018 ftunivalaska 2023-02-23T21:37:28Z Thesis (M.S.) University of Alaska Fairbanks, 2018 Benthic invertebrates are a crucial trophic link in Arctic marine food webs. However, estimates of the contribution of primary production sources sustaining these organisms are not well characterized. Potential sources could include sinking particulate organic matter from sea ice algae and phytoplankton, terrestrial organic matter eroded from the coastal environment, macroalgal material, or microbial organic matter. Proportions of these sources could also be significantly altered in the future as a result of environmental change. We measured the stable carbon isotope values of essential amino acids in muscle tissue from two common bivalve genera (Macoma spp. and Astarte spp.) collected in Hanna Shoal in the northeastern Chukchi Sea, considered an Arctic benthic hotspot. We used stable isotope mixing models in R (simmr) to compare the stable carbon isotope amino acid fingerprints of the bivalves to a suite of amino acid source endmembers, including marine phytoplankton, brown and red macroalgae, bacteria, and terrestrial plants, to estimate the proportional contributions of primary production sources to the bivalve species from Hanna Shoal. The models revealed relatively high contributions of essential amino acids from phytoplankton and bacteria averaged across both species in the region as a whole. We also examined whether stable carbon isotope fingerprints could be measured from essential amino acids preserved in bivalve shells, which could then allow proportional contributions of food sources to be estimated from ancient bivalve shells, allowing source estimates to be extended back in time. To investigate this, we measured the stable carbon isotope values of essential amino acids in a suite of paired modern bivalve shells and muscle from Macoma calcarea from the Chukchi Sea. These analyses revealed a correspondence between the fingerprints and mixing model estimates of the dominant primary production source of essential amino acids derived from analyses of ... Thesis Arctic Chukchi Chukchi Sea ice algae Phytoplankton Sea ice Alaska University of Alaska: ScholarWorks@UA Arctic Chukchi Sea Fairbanks Hanna Shoal ENVELOPE(-162.000,-162.000,72.000,72.000) |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
macoma astartidae Chukchi Sea Arctic regions bivalves benthic animals phytoplankton marine bacteria productivity primary productivity amino acids |
spellingShingle |
macoma astartidae Chukchi Sea Arctic regions bivalves benthic animals phytoplankton marine bacteria productivity primary productivity amino acids Rowe, Audrey G. Estimates of primary production sources to Arctic bivalves using amino acid stable carbon isotope fingerprinting |
topic_facet |
macoma astartidae Chukchi Sea Arctic regions bivalves benthic animals phytoplankton marine bacteria productivity primary productivity amino acids |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2018 Benthic invertebrates are a crucial trophic link in Arctic marine food webs. However, estimates of the contribution of primary production sources sustaining these organisms are not well characterized. Potential sources could include sinking particulate organic matter from sea ice algae and phytoplankton, terrestrial organic matter eroded from the coastal environment, macroalgal material, or microbial organic matter. Proportions of these sources could also be significantly altered in the future as a result of environmental change. We measured the stable carbon isotope values of essential amino acids in muscle tissue from two common bivalve genera (Macoma spp. and Astarte spp.) collected in Hanna Shoal in the northeastern Chukchi Sea, considered an Arctic benthic hotspot. We used stable isotope mixing models in R (simmr) to compare the stable carbon isotope amino acid fingerprints of the bivalves to a suite of amino acid source endmembers, including marine phytoplankton, brown and red macroalgae, bacteria, and terrestrial plants, to estimate the proportional contributions of primary production sources to the bivalve species from Hanna Shoal. The models revealed relatively high contributions of essential amino acids from phytoplankton and bacteria averaged across both species in the region as a whole. We also examined whether stable carbon isotope fingerprints could be measured from essential amino acids preserved in bivalve shells, which could then allow proportional contributions of food sources to be estimated from ancient bivalve shells, allowing source estimates to be extended back in time. To investigate this, we measured the stable carbon isotope values of essential amino acids in a suite of paired modern bivalve shells and muscle from Macoma calcarea from the Chukchi Sea. These analyses revealed a correspondence between the fingerprints and mixing model estimates of the dominant primary production source of essential amino acids derived from analyses of ... |
author2 |
Wooller, Matthew Iken, Katrin O'Brien, Diane |
format |
Thesis |
author |
Rowe, Audrey G. |
author_facet |
Rowe, Audrey G. |
author_sort |
Rowe, Audrey G. |
title |
Estimates of primary production sources to Arctic bivalves using amino acid stable carbon isotope fingerprinting |
title_short |
Estimates of primary production sources to Arctic bivalves using amino acid stable carbon isotope fingerprinting |
title_full |
Estimates of primary production sources to Arctic bivalves using amino acid stable carbon isotope fingerprinting |
title_fullStr |
Estimates of primary production sources to Arctic bivalves using amino acid stable carbon isotope fingerprinting |
title_full_unstemmed |
Estimates of primary production sources to Arctic bivalves using amino acid stable carbon isotope fingerprinting |
title_sort |
estimates of primary production sources to arctic bivalves using amino acid stable carbon isotope fingerprinting |
publishDate |
2018 |
url |
http://hdl.handle.net/11122/10338 |
long_lat |
ENVELOPE(-162.000,-162.000,72.000,72.000) |
geographic |
Arctic Chukchi Sea Fairbanks Hanna Shoal |
geographic_facet |
Arctic Chukchi Sea Fairbanks Hanna Shoal |
genre |
Arctic Chukchi Chukchi Sea ice algae Phytoplankton Sea ice Alaska |
genre_facet |
Arctic Chukchi Chukchi Sea ice algae Phytoplankton Sea ice Alaska |
op_relation |
http://hdl.handle.net/11122/10338 Department of Marine Biology |
_version_ |
1766324597033009152 |