Skeletal integrity of a marine keystone predator (Asterias rubens) threatened by ocean acidification
The current increase in atmospheric CO2 concentration induces changes in the seawater carbonate system resulting in decreased pH and calcium carbonate saturation state, a phenomenon called ocean acidification (OA). OA has long been considered as a major threat to echinoderms because their extensive...
Main Authors: | , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/302992 https://dipot.ulb.ac.be/dspace/bitstream/2013/302992/3/Di_Giglio_et_al_2020.pdf |
id |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/302992 |
---|---|
record_format |
openpolar |
spelling |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/302992 2024-04-28T08:34:33+00:00 Skeletal integrity of a marine keystone predator (Asterias rubens) threatened by ocean acidification Di Giglio, Sarah Lein, Etienne Hu, Marian Y. Stumpp, Meike Melzner, Frank Malet, Loïc Pernet, Philippe Dubois, Philippe 2020-05-01 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/302992 https://dipot.ulb.ac.be/dspace/bitstream/2013/302992/3/Di_Giglio_et_al_2020.pdf en eng uri/info:doi/10.1016/j.jembe.2020.151335 uri/info:pii/S0022098119302849 uri/info:scp/85079424525 https://dipot.ulb.ac.be/dspace/bitstream/2013/302992/3/Di_Giglio_et_al_2020.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/302992 1 full-text file(s): info:eu-repo/semantics/openAccess Journal of experimental marine biology and ecology, 526 Biologie Ocean acidification echinoderms Asterias rubens skeleton mechanics acclimation info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2020 ftunivbruxelles 2024-04-10T00:14:40Z The current increase in atmospheric CO2 concentration induces changes in the seawater carbonate system resulting in decreased pH and calcium carbonate saturation state, a phenomenon called ocean acidification (OA). OA has long been considered as a major threat to echinoderms because their extensive endoskeleton is made of high-magnesium calcite, one of the most soluble forms of calcium carbonate. Numerous studies addressed this question in sea urchins, but very few questioned the impact of OA on the sea star skeleton, although members of this taxon do not compensate their extracellular pH, contrary to most sea urchins. In the present study, adults of the common sea star, Asterias rubens from Kiel Fjord, a site experiencing natural acidification events exceeding pCO2 levels of 2500 µatm, were chronically exposed to different levels of simulated ocean acidification (pHT-SW 8.0, 7.4, 7.2), encompassing present and future conditions, for the duration of 109 days. Corrosion and mechanical properties of skeletal elements were studied using scanning electron microscopy, three-point bending tests as well as nanoindentation. The spines were significantly corroded at pHT-SW 7.4 and below while the ambulacral plates were only affected at pHT-SW 7.2. Nanoindentation of newly formed spines and ambulacral plates did not reveal significant CO2-induced differences in skeleton hardness or elasticity across treatments. Results of three-point bending tests revealed significantly reduced characteristic strength and fracture force of ambulacral plates from the median arm segment at pHT-SW 7.4 and below. These plates are those supporting the tube feet involved in the opening of bivalves during feeding and in the animal attachment to the substrate. Under reduced seawater pH, this might result in fracture of sea star plates during predation on mussel. The present results predict a possible impact of ocean acidification on the skeletal integrity of a marine keystone predator. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Ocean acidification DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Biologie Ocean acidification echinoderms Asterias rubens skeleton mechanics acclimation |
spellingShingle |
Biologie Ocean acidification echinoderms Asterias rubens skeleton mechanics acclimation Di Giglio, Sarah Lein, Etienne Hu, Marian Y. Stumpp, Meike Melzner, Frank Malet, Loïc Pernet, Philippe Dubois, Philippe Skeletal integrity of a marine keystone predator (Asterias rubens) threatened by ocean acidification |
topic_facet |
Biologie Ocean acidification echinoderms Asterias rubens skeleton mechanics acclimation |
description |
The current increase in atmospheric CO2 concentration induces changes in the seawater carbonate system resulting in decreased pH and calcium carbonate saturation state, a phenomenon called ocean acidification (OA). OA has long been considered as a major threat to echinoderms because their extensive endoskeleton is made of high-magnesium calcite, one of the most soluble forms of calcium carbonate. Numerous studies addressed this question in sea urchins, but very few questioned the impact of OA on the sea star skeleton, although members of this taxon do not compensate their extracellular pH, contrary to most sea urchins. In the present study, adults of the common sea star, Asterias rubens from Kiel Fjord, a site experiencing natural acidification events exceeding pCO2 levels of 2500 µatm, were chronically exposed to different levels of simulated ocean acidification (pHT-SW 8.0, 7.4, 7.2), encompassing present and future conditions, for the duration of 109 days. Corrosion and mechanical properties of skeletal elements were studied using scanning electron microscopy, three-point bending tests as well as nanoindentation. The spines were significantly corroded at pHT-SW 7.4 and below while the ambulacral plates were only affected at pHT-SW 7.2. Nanoindentation of newly formed spines and ambulacral plates did not reveal significant CO2-induced differences in skeleton hardness or elasticity across treatments. Results of three-point bending tests revealed significantly reduced characteristic strength and fracture force of ambulacral plates from the median arm segment at pHT-SW 7.4 and below. These plates are those supporting the tube feet involved in the opening of bivalves during feeding and in the animal attachment to the substrate. Under reduced seawater pH, this might result in fracture of sea star plates during predation on mussel. The present results predict a possible impact of ocean acidification on the skeletal integrity of a marine keystone predator. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Di Giglio, Sarah Lein, Etienne Hu, Marian Y. Stumpp, Meike Melzner, Frank Malet, Loïc Pernet, Philippe Dubois, Philippe |
author_facet |
Di Giglio, Sarah Lein, Etienne Hu, Marian Y. Stumpp, Meike Melzner, Frank Malet, Loïc Pernet, Philippe Dubois, Philippe |
author_sort |
Di Giglio, Sarah |
title |
Skeletal integrity of a marine keystone predator (Asterias rubens) threatened by ocean acidification |
title_short |
Skeletal integrity of a marine keystone predator (Asterias rubens) threatened by ocean acidification |
title_full |
Skeletal integrity of a marine keystone predator (Asterias rubens) threatened by ocean acidification |
title_fullStr |
Skeletal integrity of a marine keystone predator (Asterias rubens) threatened by ocean acidification |
title_full_unstemmed |
Skeletal integrity of a marine keystone predator (Asterias rubens) threatened by ocean acidification |
title_sort |
skeletal integrity of a marine keystone predator (asterias rubens) threatened by ocean acidification |
publishDate |
2020 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/302992 https://dipot.ulb.ac.be/dspace/bitstream/2013/302992/3/Di_Giglio_et_al_2020.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Journal of experimental marine biology and ecology, 526 |
op_relation |
uri/info:doi/10.1016/j.jembe.2020.151335 uri/info:pii/S0022098119302849 uri/info:scp/85079424525 https://dipot.ulb.ac.be/dspace/bitstream/2013/302992/3/Di_Giglio_et_al_2020.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/302992 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1797591175571439616 |