Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003
Some organisms are particularly appropriate models for investigation of variability in time and space for given environments. The erect bryozoan Cellarinella nutti, an endemic Antarctic species, is one such organism: it is extremely abundant, occurs from the polar front to the Antarctic continental...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/17/ http://www.int-res.com/articles/meps2006/314/m314p187.pdf https://doi.org/10.3354/meps314187 |
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ftnerc:oai:nora.nerc.ac.uk:17 2024-06-09T07:40:12+00:00 Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003 Barnes, David K.A. Webb, Karen Linse, Katrin 2006 http://nora.nerc.ac.uk/id/eprint/17/ http://www.int-res.com/articles/meps2006/314/m314p187.pdf https://doi.org/10.3354/meps314187 unknown Inter-Research Barnes, David K.A.; Webb, Karen; Linse, Katrin. 2006 Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003. Marine Ecology Progress Series, 314. 187-195. https://doi.org/10.3354/meps314187 <https://doi.org/10.3354/meps314187> Zoology Publication - Article PeerReviewed 2006 ftnerc https://doi.org/10.3354/meps314187 2024-05-15T08:39:04Z Some organisms are particularly appropriate models for investigation of variability in time and space for given environments. The erect bryozoan Cellarinella nutti, an endemic Antarctic species, is one such organism: it is extremely abundant, occurs from the polar front to the Antarctic continental edge, and preserves a clear macroscopic environmental record in its skeleton (growth check lines). We studied variability in the growth of 93 C. nutti individuals at depths between 247 and 414 m, at sites 1, 10, 100 and >1000 km apart in the Weddell Sea, Antarctica. Trawled C. nutti varied from 5 to 23 yr in age, and nearly half the colonies had grown asexually from fragments. We measured the annual growth increments, which ranged from ~18 zooids (8.6 mg dry mass, 0.8 mg ash-free dry mass; Age 1) to ~130 zooids (43 mg dry mass, 2.48 mg ash-free dry mass; Age 20). At 9 yr (the modal age), each C. nutti individual had precipitated >182 mg CaCO3, and by 20 yr nearly 580 mg. C. nutti grows slowly compared with other erect bryozoans, even those in the Antarctic. We found colony and site to be insignificant factors in its growth, despite the large range of distances between sites, but year was highly significant. We found a non-linear increase in growth spanning the last 2 decades that has no obvious relation to El Niño Southern Oscillation (ENSO)-associated environmental fluctuations. In particular we found that growth in 2003 was greater than in any other year measured by a factor of 2. Given its abundance, longevity, ubiquity in Antarctic waters, insignificant spatial variability in growth, but distinct annual variability, C. nutti may prove to be an important species to investigate whether benthic organisms, as well as krill, salps and fur seals, are beginning to develop major climate-related changes in phenology. Article in Journal/Newspaper Antarc* Antarctic Antarctica Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Weddell Weddell Sea Marine Ecology Progress Series 314 187 195 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
topic |
Zoology |
spellingShingle |
Zoology Barnes, David K.A. Webb, Karen Linse, Katrin Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003 |
topic_facet |
Zoology |
description |
Some organisms are particularly appropriate models for investigation of variability in time and space for given environments. The erect bryozoan Cellarinella nutti, an endemic Antarctic species, is one such organism: it is extremely abundant, occurs from the polar front to the Antarctic continental edge, and preserves a clear macroscopic environmental record in its skeleton (growth check lines). We studied variability in the growth of 93 C. nutti individuals at depths between 247 and 414 m, at sites 1, 10, 100 and >1000 km apart in the Weddell Sea, Antarctica. Trawled C. nutti varied from 5 to 23 yr in age, and nearly half the colonies had grown asexually from fragments. We measured the annual growth increments, which ranged from ~18 zooids (8.6 mg dry mass, 0.8 mg ash-free dry mass; Age 1) to ~130 zooids (43 mg dry mass, 2.48 mg ash-free dry mass; Age 20). At 9 yr (the modal age), each C. nutti individual had precipitated >182 mg CaCO3, and by 20 yr nearly 580 mg. C. nutti grows slowly compared with other erect bryozoans, even those in the Antarctic. We found colony and site to be insignificant factors in its growth, despite the large range of distances between sites, but year was highly significant. We found a non-linear increase in growth spanning the last 2 decades that has no obvious relation to El Niño Southern Oscillation (ENSO)-associated environmental fluctuations. In particular we found that growth in 2003 was greater than in any other year measured by a factor of 2. Given its abundance, longevity, ubiquity in Antarctic waters, insignificant spatial variability in growth, but distinct annual variability, C. nutti may prove to be an important species to investigate whether benthic organisms, as well as krill, salps and fur seals, are beginning to develop major climate-related changes in phenology. |
format |
Article in Journal/Newspaper |
author |
Barnes, David K.A. Webb, Karen Linse, Katrin |
author_facet |
Barnes, David K.A. Webb, Karen Linse, Katrin |
author_sort |
Barnes, David K.A. |
title |
Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003 |
title_short |
Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003 |
title_full |
Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003 |
title_fullStr |
Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003 |
title_full_unstemmed |
Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003 |
title_sort |
slow growth of antarctic bryozoans increases over 20 years and is anomalously high in 2003 |
publisher |
Inter-Research |
publishDate |
2006 |
url |
http://nora.nerc.ac.uk/id/eprint/17/ http://www.int-res.com/articles/meps2006/314/m314p187.pdf https://doi.org/10.3354/meps314187 |
geographic |
Antarctic The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Weddell Sea |
op_relation |
Barnes, David K.A.; Webb, Karen; Linse, Katrin. 2006 Slow growth of Antarctic bryozoans increases over 20 years and is anomalously high in 2003. Marine Ecology Progress Series, 314. 187-195. https://doi.org/10.3354/meps314187 <https://doi.org/10.3354/meps314187> |
op_doi |
https://doi.org/10.3354/meps314187 |
container_title |
Marine Ecology Progress Series |
container_volume |
314 |
container_start_page |
187 |
op_container_end_page |
195 |
_version_ |
1801383666161549312 |