Arctic lagoon and nearshore food webs: Relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics
Characterizing energy flow and trophic linkages is fundamental to understanding the functioning and resilience of Arctic ecosystems under increasing pressure from climate change and anthropogenic exploitation. We used carbon and nitrogen stable isotopes to examine trophic dynamics and the relative c...
Published in: | Estuarine, Coastal and Shelf Science |
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Online Access: | https://digitalcommons.uri.edu/gsofacpubs/1845 https://doi.org/10.1016/j.ecss.2021.107388 |
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-2815 2024-01-21T10:03:22+01:00 Arctic lagoon and nearshore food webs: Relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics McMahon, Kelton W. Ambrose, William G. Reynolds, Melinda J. Johnson, Beverly J. Whiting, Alex Clough, Lisa M. 2021-08-31T07:00:00Z https://digitalcommons.uri.edu/gsofacpubs/1845 https://doi.org/10.1016/j.ecss.2021.107388 unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/1845 doi:10.1016/j.ecss.2021.107388 https://doi.org/10.1016/j.ecss.2021.107388 Graduate School of Oceanography Faculty Publications Arctic Food web Lagoon Stable isotope Terrestrial organic matter Trophic position text 2021 ftunivrhodeislan https://doi.org/10.1016/j.ecss.2021.107388 2023-12-25T19:10:09Z Characterizing energy flow and trophic linkages is fundamental to understanding the functioning and resilience of Arctic ecosystems under increasing pressure from climate change and anthropogenic exploitation. We used carbon and nitrogen stable isotopes to examine trophic dynamics and the relative contribution of terrestrial organic matter, water column phytoplankton, and phytobenthos (benthic micro- and macro-autotrophs as well as sea ice algae) to the food webs supporting 45 macroconsumers in three Arctic coastal lagoon ecosystems (Krusenstern, Sisualik, Akulaaq) and the adjacent Kotzebue Sound with varying degrees of connectivity in Cape Krusenstern National Monument, Alaska. A two-source (water column particulate organic matter and benthic sediment organic matter), two-isotope trophic dynamics model informed by a Bayesian isotope mixing model revealed that the Lagoon-Kotzebue Sound coastal ecosystem supported consumers along a trophic position continuum from primary consumers, including amphipods, copepods, and clams to trophic level five predators, such as seastars, piscivorous fishes, seals, and seabirds. The relative contribution of the three primary producer end members, terrestrial organic matter (41 ± 21%), phytoplankton (25 ± 21%), and phytobenthos (34 ± 23%) varied as a function of: 1) consumer foraging ecology and 2) consumer location. Suspension feeders received most of their carbon from food webs based on phytoplankton (49 ± 11%) and terrestrial organic matter (23 ± 5%), whereas herbivores and detritivores received the majority of their carbon from phytobenthos-based food webs, 58 ± 10% and 60 ± 8%, respectively. Omnivores and predators showed more even distributions of resource reliance and greater overall variance among species. Within the invertebrates, the importance of terrestrial organic matter decreased and phytobenthos increased with increasing trophic position. The importance of terrestrial organic matter contribution increased with lagoon proximity to major rivers inputs and isolation ... Text Arctic Cape Krusenstern Climate change ice algae Phytoplankton Sea ice Alaska Copepods University of Rhode Island: DigitalCommons@URI Arctic Cape Krusenstern ENVELOPE(-113.903,-113.903,68.401,68.401) Estuarine, Coastal and Shelf Science 257 107388 |
institution |
Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
topic |
Arctic Food web Lagoon Stable isotope Terrestrial organic matter Trophic position |
spellingShingle |
Arctic Food web Lagoon Stable isotope Terrestrial organic matter Trophic position McMahon, Kelton W. Ambrose, William G. Reynolds, Melinda J. Johnson, Beverly J. Whiting, Alex Clough, Lisa M. Arctic lagoon and nearshore food webs: Relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics |
topic_facet |
Arctic Food web Lagoon Stable isotope Terrestrial organic matter Trophic position |
description |
Characterizing energy flow and trophic linkages is fundamental to understanding the functioning and resilience of Arctic ecosystems under increasing pressure from climate change and anthropogenic exploitation. We used carbon and nitrogen stable isotopes to examine trophic dynamics and the relative contribution of terrestrial organic matter, water column phytoplankton, and phytobenthos (benthic micro- and macro-autotrophs as well as sea ice algae) to the food webs supporting 45 macroconsumers in three Arctic coastal lagoon ecosystems (Krusenstern, Sisualik, Akulaaq) and the adjacent Kotzebue Sound with varying degrees of connectivity in Cape Krusenstern National Monument, Alaska. A two-source (water column particulate organic matter and benthic sediment organic matter), two-isotope trophic dynamics model informed by a Bayesian isotope mixing model revealed that the Lagoon-Kotzebue Sound coastal ecosystem supported consumers along a trophic position continuum from primary consumers, including amphipods, copepods, and clams to trophic level five predators, such as seastars, piscivorous fishes, seals, and seabirds. The relative contribution of the three primary producer end members, terrestrial organic matter (41 ± 21%), phytoplankton (25 ± 21%), and phytobenthos (34 ± 23%) varied as a function of: 1) consumer foraging ecology and 2) consumer location. Suspension feeders received most of their carbon from food webs based on phytoplankton (49 ± 11%) and terrestrial organic matter (23 ± 5%), whereas herbivores and detritivores received the majority of their carbon from phytobenthos-based food webs, 58 ± 10% and 60 ± 8%, respectively. Omnivores and predators showed more even distributions of resource reliance and greater overall variance among species. Within the invertebrates, the importance of terrestrial organic matter decreased and phytobenthos increased with increasing trophic position. The importance of terrestrial organic matter contribution increased with lagoon proximity to major rivers inputs and isolation ... |
format |
Text |
author |
McMahon, Kelton W. Ambrose, William G. Reynolds, Melinda J. Johnson, Beverly J. Whiting, Alex Clough, Lisa M. |
author_facet |
McMahon, Kelton W. Ambrose, William G. Reynolds, Melinda J. Johnson, Beverly J. Whiting, Alex Clough, Lisa M. |
author_sort |
McMahon, Kelton W. |
title |
Arctic lagoon and nearshore food webs: Relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics |
title_short |
Arctic lagoon and nearshore food webs: Relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics |
title_full |
Arctic lagoon and nearshore food webs: Relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics |
title_fullStr |
Arctic lagoon and nearshore food webs: Relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics |
title_full_unstemmed |
Arctic lagoon and nearshore food webs: Relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics |
title_sort |
arctic lagoon and nearshore food webs: relative contributions of terrestrial organic matter, phytoplankton, and phytobenthos vary with consumer foraging dynamics |
publisher |
DigitalCommons@URI |
publishDate |
2021 |
url |
https://digitalcommons.uri.edu/gsofacpubs/1845 https://doi.org/10.1016/j.ecss.2021.107388 |
long_lat |
ENVELOPE(-113.903,-113.903,68.401,68.401) |
geographic |
Arctic Cape Krusenstern |
geographic_facet |
Arctic Cape Krusenstern |
genre |
Arctic Cape Krusenstern Climate change ice algae Phytoplankton Sea ice Alaska Copepods |
genre_facet |
Arctic Cape Krusenstern Climate change ice algae Phytoplankton Sea ice Alaska Copepods |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/1845 doi:10.1016/j.ecss.2021.107388 https://doi.org/10.1016/j.ecss.2021.107388 |
op_doi |
https://doi.org/10.1016/j.ecss.2021.107388 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
257 |
container_start_page |
107388 |
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1788693662526341120 |