Meltwater effects on intertidal Antarctic limpets, Nacella concinna
Responses of the Antarctic limpet Nacella concinna (Mollusca: Gastropoda) to meltwater exposure were studied at Adelaide Island (67°34′S 68°08′W). Limpets in crevices could be bathed in pure meltwater, though animals in large pools often avoided significant exposure to lowered salinity because of ma...
Published in: | Journal of the Marine Biological Association of the United Kingdom |
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Online Access: | http://dx.doi.org/10.1017/s0025315401004313 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315401004313 |
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crcambridgeupr:10.1017/s0025315401004313 2024-03-03T08:36:12+00:00 Meltwater effects on intertidal Antarctic limpets, Nacella concinna Davenport, John 2001 http://dx.doi.org/10.1017/s0025315401004313 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315401004313 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of the Marine Biological Association of the United Kingdom volume 81, issue 4, page 643-649 ISSN 0025-3154 1469-7769 Aquatic Science journal-article 2001 crcambridgeupr https://doi.org/10.1017/s0025315401004313 2024-02-08T08:29:26Z Responses of the Antarctic limpet Nacella concinna (Mollusca: Gastropoda) to meltwater exposure were studied at Adelaide Island (67°34′S 68°08′W). Limpets in crevices could be bathed in pure meltwater, though animals in large pools often avoided significant exposure to lowered salinity because of marked halocline formation. Small pools containing limpets showed extremely demanding osmotic environments with fluctuations between salinities of 3 and 30 psu being recorded within 1–2 min because of alternating meltwater and wave action. Analysis of haemolymph osmolarities in animals taken from the field demonstrated significant falls in osmolality (to 600–800 mOsm kg −1 ) compared with control animals living in seawater (1000 mOsm kg −1 ). A few moribund animals had osmolarities <600 mOsm kg −1 . Nacella concinna are stenohaline osmoconformers with a median lower lethal salinity (96 h) of 20·9 psu and a median lethal time for freshwater exposure of 2 h 18 min. A 1 h exposure to freshwater caused a 14% increase in body volume and a 27% loss of body fluid ions. Nacella concinna responds behaviourally to meltwater by short-term, ineffective, clamp down of the shell, retraction of the head, cephalic tentacles and mantle margin tentacles. On vertical surfaces limpets respond actively to freshwater exposure by rapid detachment; 50% of animals lose adhesion within 5 min. Consideration of tidal regimes at Adelaide Island suggests that an individual intertidal limpet has a risk of being exposed to severe meltwater exposure about once per year. Article in Journal/Newspaper Adelaide Island Antarc* Antarctic Cambridge University Press Adelaide Island ENVELOPE(-68.914,-68.914,-67.762,-67.762) Antarctic Nacella ENVELOPE(-60.783,-60.783,-62.467,-62.467) The Antarctic Journal of the Marine Biological Association of the United Kingdom 81 4 643 649 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Aquatic Science |
spellingShingle |
Aquatic Science Davenport, John Meltwater effects on intertidal Antarctic limpets, Nacella concinna |
topic_facet |
Aquatic Science |
description |
Responses of the Antarctic limpet Nacella concinna (Mollusca: Gastropoda) to meltwater exposure were studied at Adelaide Island (67°34′S 68°08′W). Limpets in crevices could be bathed in pure meltwater, though animals in large pools often avoided significant exposure to lowered salinity because of marked halocline formation. Small pools containing limpets showed extremely demanding osmotic environments with fluctuations between salinities of 3 and 30 psu being recorded within 1–2 min because of alternating meltwater and wave action. Analysis of haemolymph osmolarities in animals taken from the field demonstrated significant falls in osmolality (to 600–800 mOsm kg −1 ) compared with control animals living in seawater (1000 mOsm kg −1 ). A few moribund animals had osmolarities <600 mOsm kg −1 . Nacella concinna are stenohaline osmoconformers with a median lower lethal salinity (96 h) of 20·9 psu and a median lethal time for freshwater exposure of 2 h 18 min. A 1 h exposure to freshwater caused a 14% increase in body volume and a 27% loss of body fluid ions. Nacella concinna responds behaviourally to meltwater by short-term, ineffective, clamp down of the shell, retraction of the head, cephalic tentacles and mantle margin tentacles. On vertical surfaces limpets respond actively to freshwater exposure by rapid detachment; 50% of animals lose adhesion within 5 min. Consideration of tidal regimes at Adelaide Island suggests that an individual intertidal limpet has a risk of being exposed to severe meltwater exposure about once per year. |
format |
Article in Journal/Newspaper |
author |
Davenport, John |
author_facet |
Davenport, John |
author_sort |
Davenport, John |
title |
Meltwater effects on intertidal Antarctic limpets, Nacella concinna |
title_short |
Meltwater effects on intertidal Antarctic limpets, Nacella concinna |
title_full |
Meltwater effects on intertidal Antarctic limpets, Nacella concinna |
title_fullStr |
Meltwater effects on intertidal Antarctic limpets, Nacella concinna |
title_full_unstemmed |
Meltwater effects on intertidal Antarctic limpets, Nacella concinna |
title_sort |
meltwater effects on intertidal antarctic limpets, nacella concinna |
publisher |
Cambridge University Press (CUP) |
publishDate |
2001 |
url |
http://dx.doi.org/10.1017/s0025315401004313 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315401004313 |
long_lat |
ENVELOPE(-68.914,-68.914,-67.762,-67.762) ENVELOPE(-60.783,-60.783,-62.467,-62.467) |
geographic |
Adelaide Island Antarctic Nacella The Antarctic |
geographic_facet |
Adelaide Island Antarctic Nacella The Antarctic |
genre |
Adelaide Island Antarc* Antarctic |
genre_facet |
Adelaide Island Antarc* Antarctic |
op_source |
Journal of the Marine Biological Association of the United Kingdom volume 81, issue 4, page 643-649 ISSN 0025-3154 1469-7769 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0025315401004313 |
container_title |
Journal of the Marine Biological Association of the United Kingdom |
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81 |
container_issue |
4 |
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643 |
op_container_end_page |
649 |
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