Seasonal Dietary Shifts of the Gammarid Amphipod Gondogeneia antarctica in a Rapidly Warming Fjord of the West Antarctic Peninsula
The amphipod Gondogeneia antarctica is among the most abundant benthic organisms, and a key food web species along the rapidly warming West Antarctic Peninsula (WAP). However, little is known about its trophic strategy for dealing with the extreme seasonality of Antarctic marine primary production....
Published in: | Journal of Marine Science and Engineering |
---|---|
Main Authors: | , , , , |
Format: | Text |
Language: | English |
Published: |
Multidisciplinary Digital Publishing Institute
2021
|
Subjects: | |
Online Access: | https://doi.org/10.3390/jmse9121447 |
id |
ftmdpi:oai:mdpi.com:/2077-1312/9/12/1447/ |
---|---|
record_format |
openpolar |
spelling |
ftmdpi:oai:mdpi.com:/2077-1312/9/12/1447/ 2023-08-20T04:00:34+02:00 Seasonal Dietary Shifts of the Gammarid Amphipod Gondogeneia antarctica in a Rapidly Warming Fjord of the West Antarctic Peninsula In-Young Ahn Francyne Elias-Piera Sun-Yong Ha Sergio Rossi Dong-U Kim agris 2021-12-17 application/pdf https://doi.org/10.3390/jmse9121447 EN eng Multidisciplinary Digital Publishing Institute Marine Biology https://dx.doi.org/10.3390/jmse9121447 https://creativecommons.org/licenses/by/4.0/ Journal of Marine Science and Engineering; Volume 9; Issue 12; Pages: 1447 Gondogeneia antarctica seasonal dietary shift macroalgae benthic diatoms C and N stable isotopes West Antarctic Peninsula King George Island Marian Cove (62°13′ S 58°47′ W) Text 2021 ftmdpi https://doi.org/10.3390/jmse9121447 2023-08-01T03:35:06Z The amphipod Gondogeneia antarctica is among the most abundant benthic organisms, and a key food web species along the rapidly warming West Antarctic Peninsula (WAP). However, little is known about its trophic strategy for dealing with the extreme seasonality of Antarctic marine primary production. This study, using trophic markers, for the first time investigated seasonal dietary shifts of G. antarctica in a WAP fjord. We analyzed δ13C and δ15N in G. antarctica and its potential food sources. The isotopic signatures revealed a substantial contribution of red algae to the amphipod diet and also indicated a significant contribution of benthic diatoms. The isotope results were further supported by fatty acid (FA) analysis, which showed high similarities in FA composition (64% spring–summer, 58% fall–winter) between G. antarctica and the red algal species. G. antarctica δ13C showed a small shift seasonally (−18.9 to −21.4‰), suggesting that the main diets do not change much year-round. However, the relatively high δ15N values as for primary consumers indicated additional dietary sources such as animal parts. Interestingly, G. antarctica and its potential food sources were significantly enriched with δ15N during the fall–winter season, presumably through a degradation process, suggesting that G. antarctica consumes a substantial portion of its diets in the form of detritus. Overall, the results revealed that G. antarctica relies primarily on food sources derived from benthic primary producers throughout much of the year. Thus, G. antarctica is unlikely very affected by seasonal Antarctic primary production, and this strategy seems to have allowed them to adapt to shallow Antarctic nearshore waters. Text Antarc* Antarctic Antarctic Peninsula Antarctica King George Island MDPI Open Access Publishing Antarctic Antarctic Peninsula King George Island Marian ENVELOPE(-58.750,-58.750,-62.217,-62.217) Marian Cove ENVELOPE(-58.800,-58.800,-62.217,-62.217) Journal of Marine Science and Engineering 9 12 1447 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
Gondogeneia antarctica seasonal dietary shift macroalgae benthic diatoms C and N stable isotopes West Antarctic Peninsula King George Island Marian Cove (62°13′ S 58°47′ W) |
spellingShingle |
Gondogeneia antarctica seasonal dietary shift macroalgae benthic diatoms C and N stable isotopes West Antarctic Peninsula King George Island Marian Cove (62°13′ S 58°47′ W) In-Young Ahn Francyne Elias-Piera Sun-Yong Ha Sergio Rossi Dong-U Kim Seasonal Dietary Shifts of the Gammarid Amphipod Gondogeneia antarctica in a Rapidly Warming Fjord of the West Antarctic Peninsula |
topic_facet |
Gondogeneia antarctica seasonal dietary shift macroalgae benthic diatoms C and N stable isotopes West Antarctic Peninsula King George Island Marian Cove (62°13′ S 58°47′ W) |
description |
The amphipod Gondogeneia antarctica is among the most abundant benthic organisms, and a key food web species along the rapidly warming West Antarctic Peninsula (WAP). However, little is known about its trophic strategy for dealing with the extreme seasonality of Antarctic marine primary production. This study, using trophic markers, for the first time investigated seasonal dietary shifts of G. antarctica in a WAP fjord. We analyzed δ13C and δ15N in G. antarctica and its potential food sources. The isotopic signatures revealed a substantial contribution of red algae to the amphipod diet and also indicated a significant contribution of benthic diatoms. The isotope results were further supported by fatty acid (FA) analysis, which showed high similarities in FA composition (64% spring–summer, 58% fall–winter) between G. antarctica and the red algal species. G. antarctica δ13C showed a small shift seasonally (−18.9 to −21.4‰), suggesting that the main diets do not change much year-round. However, the relatively high δ15N values as for primary consumers indicated additional dietary sources such as animal parts. Interestingly, G. antarctica and its potential food sources were significantly enriched with δ15N during the fall–winter season, presumably through a degradation process, suggesting that G. antarctica consumes a substantial portion of its diets in the form of detritus. Overall, the results revealed that G. antarctica relies primarily on food sources derived from benthic primary producers throughout much of the year. Thus, G. antarctica is unlikely very affected by seasonal Antarctic primary production, and this strategy seems to have allowed them to adapt to shallow Antarctic nearshore waters. |
format |
Text |
author |
In-Young Ahn Francyne Elias-Piera Sun-Yong Ha Sergio Rossi Dong-U Kim |
author_facet |
In-Young Ahn Francyne Elias-Piera Sun-Yong Ha Sergio Rossi Dong-U Kim |
author_sort |
In-Young Ahn |
title |
Seasonal Dietary Shifts of the Gammarid Amphipod Gondogeneia antarctica in a Rapidly Warming Fjord of the West Antarctic Peninsula |
title_short |
Seasonal Dietary Shifts of the Gammarid Amphipod Gondogeneia antarctica in a Rapidly Warming Fjord of the West Antarctic Peninsula |
title_full |
Seasonal Dietary Shifts of the Gammarid Amphipod Gondogeneia antarctica in a Rapidly Warming Fjord of the West Antarctic Peninsula |
title_fullStr |
Seasonal Dietary Shifts of the Gammarid Amphipod Gondogeneia antarctica in a Rapidly Warming Fjord of the West Antarctic Peninsula |
title_full_unstemmed |
Seasonal Dietary Shifts of the Gammarid Amphipod Gondogeneia antarctica in a Rapidly Warming Fjord of the West Antarctic Peninsula |
title_sort |
seasonal dietary shifts of the gammarid amphipod gondogeneia antarctica in a rapidly warming fjord of the west antarctic peninsula |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/jmse9121447 |
op_coverage |
agris |
long_lat |
ENVELOPE(-58.750,-58.750,-62.217,-62.217) ENVELOPE(-58.800,-58.800,-62.217,-62.217) |
geographic |
Antarctic Antarctic Peninsula King George Island Marian Marian Cove |
geographic_facet |
Antarctic Antarctic Peninsula King George Island Marian Marian Cove |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica King George Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica King George Island |
op_source |
Journal of Marine Science and Engineering; Volume 9; Issue 12; Pages: 1447 |
op_relation |
Marine Biology https://dx.doi.org/10.3390/jmse9121447 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/jmse9121447 |
container_title |
Journal of Marine Science and Engineering |
container_volume |
9 |
container_issue |
12 |
container_start_page |
1447 |
_version_ |
1774718942273601536 |