The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica
This study used an energy budget approach to record changes in the biology of the Antarctic sea urchin Sterechinus neumayeri in relation to environmental seasonality (i. e changes in chlorophyll standing stock and seawater temperature) over an unbroken two year period. Chlorophyll standing stock sho...
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ftopenunivgb:oai:oro.open.ac.uk:58168 2023-06-11T04:02:56+02:00 The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica Brockington, Simon 2001 application/pdf https://oro.open.ac.uk/58168/ https://oro.open.ac.uk/58168/1/342936.pdf https://doi.org/10.21954/ou.ro.0000e338 unknown https://oro.open.ac.uk/58168/1/342936.pdf Brockington, Simon (2001). The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica. PhD thesis The Open University. Thesis Public PeerReviewed 2001 ftopenunivgb https://doi.org/10.21954/ou.ro.0000e338 2023-05-28T05:58:39Z This study used an energy budget approach to record changes in the biology of the Antarctic sea urchin Sterechinus neumayeri in relation to environmental seasonality (i. e changes in chlorophyll standing stock and seawater temperature) over an unbroken two year period. Chlorophyll standing stock showed a brief but intense bloom each austral summer which contrasted with prolonged winter minima. Benthic chlorophyll standing stock, as recorded from sediment cores showed a similar cycle. Seawater temperature varied between -1.8°C and +1.2°C. Feeding activity was highly seasonal and closely correlated to chlorophyll standing stock. Feeding ceased during the austral winter of 1997 and 1998 for 6 and 4 months respectively. Metabolism, as measured by oxygen consumption and also ammonia excretion showed strong seasonality, with relatively brief 3 to 4 month periods of elevated activity in the austral summer contrasting with prolonged winter dormancy. Laboratory studies indicated that only 10-15% of the 3 fold seasonal rise in metabolism was caused directly by temperature (Q 10 =2.5) and that 80- 85% was related to increased physiological activity associated with feeding. Growth rate was measured over one year and was very slow. Comparison with other studies indicated that echinoid growth rate is strongly dependent on food availability, but that maximal growth rate is limited by seawater temperature, or by a co-varying factor. S. neumayeri is an annual spawner and histology was used to describe both the vitellogenic cycle and also to calculate reproductive output. Comparison with other published studies worldwide indicated that reproductive output is highly dependent on food availability, and that maximal reproductive output is not limited by temperature. Although the overall P: B ratio was low, the ratio of reproductive production to total production was higher than expected. These results indicated that due to the low metabolic rate only 12-16% of total body energy levels were used to endure the prolonged non-feeding ... Thesis Adelaide Island Antarc* Antarctic Antarctica The Open University: Open Research Online (ORO) Adelaide Island ENVELOPE(-68.914,-68.914,-67.762,-67.762) Antarctic Austral The Antarctic |
institution |
Open Polar |
collection |
The Open University: Open Research Online (ORO) |
op_collection_id |
ftopenunivgb |
language |
unknown |
description |
This study used an energy budget approach to record changes in the biology of the Antarctic sea urchin Sterechinus neumayeri in relation to environmental seasonality (i. e changes in chlorophyll standing stock and seawater temperature) over an unbroken two year period. Chlorophyll standing stock showed a brief but intense bloom each austral summer which contrasted with prolonged winter minima. Benthic chlorophyll standing stock, as recorded from sediment cores showed a similar cycle. Seawater temperature varied between -1.8°C and +1.2°C. Feeding activity was highly seasonal and closely correlated to chlorophyll standing stock. Feeding ceased during the austral winter of 1997 and 1998 for 6 and 4 months respectively. Metabolism, as measured by oxygen consumption and also ammonia excretion showed strong seasonality, with relatively brief 3 to 4 month periods of elevated activity in the austral summer contrasting with prolonged winter dormancy. Laboratory studies indicated that only 10-15% of the 3 fold seasonal rise in metabolism was caused directly by temperature (Q 10 =2.5) and that 80- 85% was related to increased physiological activity associated with feeding. Growth rate was measured over one year and was very slow. Comparison with other studies indicated that echinoid growth rate is strongly dependent on food availability, but that maximal growth rate is limited by seawater temperature, or by a co-varying factor. S. neumayeri is an annual spawner and histology was used to describe both the vitellogenic cycle and also to calculate reproductive output. Comparison with other published studies worldwide indicated that reproductive output is highly dependent on food availability, and that maximal reproductive output is not limited by temperature. Although the overall P: B ratio was low, the ratio of reproductive production to total production was higher than expected. These results indicated that due to the low metabolic rate only 12-16% of total body energy levels were used to endure the prolonged non-feeding ... |
format |
Thesis |
author |
Brockington, Simon |
spellingShingle |
Brockington, Simon The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica |
author_facet |
Brockington, Simon |
author_sort |
Brockington, Simon |
title |
The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica |
title_short |
The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica |
title_full |
The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica |
title_fullStr |
The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica |
title_full_unstemmed |
The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica |
title_sort |
seasonal ecology and physiology of sterechinus neumayeri (echinodermata; echinoidea) at adelaide island, antarctica |
publishDate |
2001 |
url |
https://oro.open.ac.uk/58168/ https://oro.open.ac.uk/58168/1/342936.pdf https://doi.org/10.21954/ou.ro.0000e338 |
long_lat |
ENVELOPE(-68.914,-68.914,-67.762,-67.762) |
geographic |
Adelaide Island Antarctic Austral The Antarctic |
geographic_facet |
Adelaide Island Antarctic Austral The Antarctic |
genre |
Adelaide Island Antarc* Antarctic Antarctica |
genre_facet |
Adelaide Island Antarc* Antarctic Antarctica |
op_relation |
https://oro.open.ac.uk/58168/1/342936.pdf Brockington, Simon (2001). The seasonal ecology and physiology of Sterechinus neumayeri (Echinodermata; Echinoidea) at Adelaide Island, Antarctica. PhD thesis The Open University. |
op_doi |
https://doi.org/10.21954/ou.ro.0000e338 |
_version_ |
1768384537301090304 |