Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods.
Life-cycles of polar herbivorous copepods are characterised by seasonal/ontogenetic vertical migrations and diapause to survive periods of food shortage during the long winter season. However, the triggers of vertical migration and diapause are still far from being understood. In this study, we test...
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ftdoajarticles:oai:doaj.org/article:66fe6fce42e54c83a041ba7c4d2f47b4 2023-05-15T13:35:24+02:00 Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. Sabine Schründer Sigrid B Schnack-Schiel Holger Auel Franz Josef Sartoris 2013-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0077498 https://doaj.org/article/66fe6fce42e54c83a041ba7c4d2f47b4 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3797083?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0077498 https://doaj.org/article/66fe6fce42e54c83a041ba7c4d2f47b4 PLoS ONE, Vol 8, Iss 10, p e77498 (2013) Medicine R Science Q article 2013 ftdoajarticles https://doi.org/10.1371/journal.pone.0077498 2022-12-31T13:03:47Z Life-cycles of polar herbivorous copepods are characterised by seasonal/ontogenetic vertical migrations and diapause to survive periods of food shortage during the long winter season. However, the triggers of vertical migration and diapause are still far from being understood. In this study, we test the hypothesis that acidic pH and the accumulation of ammonium (NH4 (+)) in the hemolymph contribute to the control of diapause in certain Antarctic copepod species. In a recent study, it was already hypothesized that the replacement of heavy ions by ammonium is necessary for diapausing copepods to achieve neutral buoyancy at overwintering depth. The current article extends the hypothesis of ammonium-aided buoyancy by highlighting recent findings of low pH values in the hemolymph of diapausing copepods with elevated ammonium concentrations. Since ammonia (NH3) is toxic to most organisms, a low hemolymph pH is required to maintain ammonium in the less toxic ionized form (NH4 (+)). Recognizing that low pH values are a relevant factor reducing metabolic rate in other marine invertebrates, the low pH values found in overwintering copepods might not only be a precondition for ammonium accumulation, but in addition, it may insure metabolic depression throughout diapause. Article in Journal/Newspaper Antarc* Antarctic Copepods Directory of Open Access Journals: DOAJ Articles Antarctic PLoS ONE 8 10 e77498 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Sabine Schründer Sigrid B Schnack-Schiel Holger Auel Franz Josef Sartoris Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. |
topic_facet |
Medicine R Science Q |
description |
Life-cycles of polar herbivorous copepods are characterised by seasonal/ontogenetic vertical migrations and diapause to survive periods of food shortage during the long winter season. However, the triggers of vertical migration and diapause are still far from being understood. In this study, we test the hypothesis that acidic pH and the accumulation of ammonium (NH4 (+)) in the hemolymph contribute to the control of diapause in certain Antarctic copepod species. In a recent study, it was already hypothesized that the replacement of heavy ions by ammonium is necessary for diapausing copepods to achieve neutral buoyancy at overwintering depth. The current article extends the hypothesis of ammonium-aided buoyancy by highlighting recent findings of low pH values in the hemolymph of diapausing copepods with elevated ammonium concentrations. Since ammonia (NH3) is toxic to most organisms, a low hemolymph pH is required to maintain ammonium in the less toxic ionized form (NH4 (+)). Recognizing that low pH values are a relevant factor reducing metabolic rate in other marine invertebrates, the low pH values found in overwintering copepods might not only be a precondition for ammonium accumulation, but in addition, it may insure metabolic depression throughout diapause. |
format |
Article in Journal/Newspaper |
author |
Sabine Schründer Sigrid B Schnack-Schiel Holger Auel Franz Josef Sartoris |
author_facet |
Sabine Schründer Sigrid B Schnack-Schiel Holger Auel Franz Josef Sartoris |
author_sort |
Sabine Schründer |
title |
Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. |
title_short |
Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. |
title_full |
Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. |
title_fullStr |
Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. |
title_full_unstemmed |
Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. |
title_sort |
control of diapause by acidic ph and ammonium accumulation in the hemolymph of antarctic copepods. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2013 |
url |
https://doi.org/10.1371/journal.pone.0077498 https://doaj.org/article/66fe6fce42e54c83a041ba7c4d2f47b4 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Copepods |
genre_facet |
Antarc* Antarctic Copepods |
op_source |
PLoS ONE, Vol 8, Iss 10, p e77498 (2013) |
op_relation |
http://europepmc.org/articles/PMC3797083?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0077498 https://doaj.org/article/66fe6fce42e54c83a041ba7c4d2f47b4 |
op_doi |
https://doi.org/10.1371/journal.pone.0077498 |
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PLoS ONE |
container_volume |
8 |
container_issue |
10 |
container_start_page |
e77498 |
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1766065229701054464 |