Degradation of macroalgal detritus in shallow coastal Antarctic sediments
Glaciers along the western Antarctic Peninsula are retreating at unprecedented rates, opening up sublittoral rocky substrate for colonization by marine organisms such as macroalgae. When macroalgae are physically detached due to storms or erosion, their fragments can accumulate in seabed hollows, wh...
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ftunivgent:oai:archive.ugent.be:8606811 2023-06-11T04:06:12+02:00 Degradation of macroalgal detritus in shallow coastal Antarctic sediments Braeckman, Ulrike Pasotti, Francesca Vázquez, S Zacher, K Hoffmann, R Elvert, M Marchant, H Buckner, C Quartino, ML Mác Cormack, W Soetaert, K Wenzhöfer, F Vanreusel, Ann 2019 application/pdf https://biblio.ugent.be/publication/8606811 http://hdl.handle.net/1854/LU-8606811 https://doi.org/10.1002/lno.11125 https://biblio.ugent.be/publication/8606811/file/8636621 eng eng https://biblio.ugent.be/publication/8606811 http://hdl.handle.net/1854/LU-8606811 http://dx.doi.org/10.1002/lno.11125 https://biblio.ugent.be/publication/8606811/file/8636621 No license (in copyright) info:eu-repo/semantics/openAccess LIMNOLOGY AND OCEANOGRAPHY ISSN: 0024-3590 ISSN: 1939-5590 Biology and Life Sciences Earth and Environmental Sciences KING-GEORGE-ISLAND SOUTH SHETLAND ISLANDS FISH NOTOTHENIA-CORIICEPS POTTER COVE MICROPHYTOBENTHOS CARBON FEEDING ECOLOGY INTERTIDAL MICROPHYTOBENTHOS TROPHIC RELATIONSHIPS WATER MEIOFAUNA ORGANIC-MATTER journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftunivgent https://doi.org/10.1002/lno.11125 2023-05-10T22:36:21Z Glaciers along the western Antarctic Peninsula are retreating at unprecedented rates, opening up sublittoral rocky substrate for colonization by marine organisms such as macroalgae. When macroalgae are physically detached due to storms or erosion, their fragments can accumulate in seabed hollows, where they can be grazed upon by herbivores or be degraded microbially or be sequestered. To understand the fate of the increasing amount of macroalgal detritus in Antarctic shallow subtidal sediments, a mesocosm experiment was conducted to track C-13- and N-15-labeled macroalgal detritus into the benthic bacterial, meiofaunal, and macrofaunal biomass and respiration of sediments from Potter Cove (King George Island). We compared the degradation pathways of two macroalgae species: one considered palatable for herbivores (the red algae Palmaria decipiens) and other considered nonpalatable for herbivores (the brown algae Desmarestia anceps). The carbon from Palmaria was recycled at a higher rate than that of Desmarestia, with herbivores such as amphipods playing a stronger role in the early degradation process of the Palmaria fragments and the microbial community taking over at a later stage. In contrast, Desmarestia was more buried in the subsurface sediments, stimulating subsurface bacterial degradation. Macrofauna probably relied indirectly on Desmarestia carbon, recycled by bacteria and microphytobenthos. The efficient cycling of the nutrients and carbon from the macroalgae supports a positive feedback loop among bacteria, microphytobenthos, and meiofaunal and macrofaunal grazers, resulting in longer term retention of macroalgal nutrients in the sediment, hence creating a food bank for the benthos. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula King George Island South Shetland Islands Ghent University Academic Bibliography Antarctic Antarctic Peninsula King George Island Potter Cove South Shetland Islands Limnology and Oceanography 64 4 1423 1441 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Biology and Life Sciences Earth and Environmental Sciences KING-GEORGE-ISLAND SOUTH SHETLAND ISLANDS FISH NOTOTHENIA-CORIICEPS POTTER COVE MICROPHYTOBENTHOS CARBON FEEDING ECOLOGY INTERTIDAL MICROPHYTOBENTHOS TROPHIC RELATIONSHIPS WATER MEIOFAUNA ORGANIC-MATTER |
spellingShingle |
Biology and Life Sciences Earth and Environmental Sciences KING-GEORGE-ISLAND SOUTH SHETLAND ISLANDS FISH NOTOTHENIA-CORIICEPS POTTER COVE MICROPHYTOBENTHOS CARBON FEEDING ECOLOGY INTERTIDAL MICROPHYTOBENTHOS TROPHIC RELATIONSHIPS WATER MEIOFAUNA ORGANIC-MATTER Braeckman, Ulrike Pasotti, Francesca Vázquez, S Zacher, K Hoffmann, R Elvert, M Marchant, H Buckner, C Quartino, ML Mác Cormack, W Soetaert, K Wenzhöfer, F Vanreusel, Ann Degradation of macroalgal detritus in shallow coastal Antarctic sediments |
topic_facet |
Biology and Life Sciences Earth and Environmental Sciences KING-GEORGE-ISLAND SOUTH SHETLAND ISLANDS FISH NOTOTHENIA-CORIICEPS POTTER COVE MICROPHYTOBENTHOS CARBON FEEDING ECOLOGY INTERTIDAL MICROPHYTOBENTHOS TROPHIC RELATIONSHIPS WATER MEIOFAUNA ORGANIC-MATTER |
description |
Glaciers along the western Antarctic Peninsula are retreating at unprecedented rates, opening up sublittoral rocky substrate for colonization by marine organisms such as macroalgae. When macroalgae are physically detached due to storms or erosion, their fragments can accumulate in seabed hollows, where they can be grazed upon by herbivores or be degraded microbially or be sequestered. To understand the fate of the increasing amount of macroalgal detritus in Antarctic shallow subtidal sediments, a mesocosm experiment was conducted to track C-13- and N-15-labeled macroalgal detritus into the benthic bacterial, meiofaunal, and macrofaunal biomass and respiration of sediments from Potter Cove (King George Island). We compared the degradation pathways of two macroalgae species: one considered palatable for herbivores (the red algae Palmaria decipiens) and other considered nonpalatable for herbivores (the brown algae Desmarestia anceps). The carbon from Palmaria was recycled at a higher rate than that of Desmarestia, with herbivores such as amphipods playing a stronger role in the early degradation process of the Palmaria fragments and the microbial community taking over at a later stage. In contrast, Desmarestia was more buried in the subsurface sediments, stimulating subsurface bacterial degradation. Macrofauna probably relied indirectly on Desmarestia carbon, recycled by bacteria and microphytobenthos. The efficient cycling of the nutrients and carbon from the macroalgae supports a positive feedback loop among bacteria, microphytobenthos, and meiofaunal and macrofaunal grazers, resulting in longer term retention of macroalgal nutrients in the sediment, hence creating a food bank for the benthos. |
format |
Article in Journal/Newspaper |
author |
Braeckman, Ulrike Pasotti, Francesca Vázquez, S Zacher, K Hoffmann, R Elvert, M Marchant, H Buckner, C Quartino, ML Mác Cormack, W Soetaert, K Wenzhöfer, F Vanreusel, Ann |
author_facet |
Braeckman, Ulrike Pasotti, Francesca Vázquez, S Zacher, K Hoffmann, R Elvert, M Marchant, H Buckner, C Quartino, ML Mác Cormack, W Soetaert, K Wenzhöfer, F Vanreusel, Ann |
author_sort |
Braeckman, Ulrike |
title |
Degradation of macroalgal detritus in shallow coastal Antarctic sediments |
title_short |
Degradation of macroalgal detritus in shallow coastal Antarctic sediments |
title_full |
Degradation of macroalgal detritus in shallow coastal Antarctic sediments |
title_fullStr |
Degradation of macroalgal detritus in shallow coastal Antarctic sediments |
title_full_unstemmed |
Degradation of macroalgal detritus in shallow coastal Antarctic sediments |
title_sort |
degradation of macroalgal detritus in shallow coastal antarctic sediments |
publishDate |
2019 |
url |
https://biblio.ugent.be/publication/8606811 http://hdl.handle.net/1854/LU-8606811 https://doi.org/10.1002/lno.11125 https://biblio.ugent.be/publication/8606811/file/8636621 |
geographic |
Antarctic Antarctic Peninsula King George Island Potter Cove South Shetland Islands |
geographic_facet |
Antarctic Antarctic Peninsula King George Island Potter Cove South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Peninsula King George Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula King George Island South Shetland Islands |
op_source |
LIMNOLOGY AND OCEANOGRAPHY ISSN: 0024-3590 ISSN: 1939-5590 |
op_relation |
https://biblio.ugent.be/publication/8606811 http://hdl.handle.net/1854/LU-8606811 http://dx.doi.org/10.1002/lno.11125 https://biblio.ugent.be/publication/8606811/file/8636621 |
op_rights |
No license (in copyright) info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/lno.11125 |
container_title |
Limnology and Oceanography |
container_volume |
64 |
container_issue |
4 |
container_start_page |
1423 |
op_container_end_page |
1441 |
_version_ |
1768378013700849664 |