Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives
Thesis (M.Sc.)--Memorial University of Newfoundland, 2010. Earth Sciences Includes bibliographical references. A sclerochronological study of two common cold-water corals from the Northeast Pacific, Stylaster campylecus parageus and Primnoa pacifica, was performed on specimens collected in 2008 from...
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ftmemorialunivdc:oai:collections.mun.ca:theses5/38850 2023-05-15T17:23:34+02:00 Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives Aranha, Renita Memorial University of Newfoundland. Dept. of Earth Sciences Pacific Ocean 2010 xix, [237] leaves : ill., maps (some col.) +1 CD-ROM (4 3/4 in) Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/38850 Eng eng http://collections.mun.ca/theses_extras/Aranha_Renita.zip Electronic Theses and Dissertations (19.60 MB) -- http://collections.mun.ca/PDFs/theses/Aranha_Renita.pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/38850 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Zooxanthellate corals--Northeast Pacific Ocean Paleoceanography--Northeast Pacific Ocean Sclerochronology--Northeast Pacific Ocean Deep sea corals--Habitat--Northeast Pacific Ocean Deep sea corals--Effect of environment on--Northeast Pacific Ocean Text Electronic thesis or dissertation 2010 ftmemorialunivdc 2015-08-06T19:22:53Z Thesis (M.Sc.)--Memorial University of Newfoundland, 2010. Earth Sciences Includes bibliographical references. A sclerochronological study of two common cold-water corals from the Northeast Pacific, Stylaster campylecus parageus and Primnoa pacifica, was performed on specimens collected in 2008 from Dixon Entrance, BC, and the Olympic Coast National Marine Sanctuary, Washington State. SEM imaging of S. campylecus revealed the presence of growth banding and extensive skeletal remineralization. Profiles of Na/Ca, Mg/Ca, Sr/Ca and Ba/Ca could, however, be obtained with Secondary Ion Mass Spectrometry. Sr/Ca values were observed to display two maxima over distances covering approximately 12 growth bands, with corresponding minima in Mg/Ca and Na/Ca. These cyclical co-variations were interpreted to be primarily influenced by surface water productivity. This cyclicity in the trace element profiles, in the context of a documented biannual increase in productivity, suggested that the growth bands are monthly. -- The average radial growth rate of S. campylecus was 1.4 ± 0.1 mm.yr-1, and the average axial growth rate was 17.3 ± 1.1 mm.yr-1. Temperature changes cannot account for the variation in Mg/Ca and Sr/Ca in either S. campylecus or P. pacifica. These variations appear instead to be modulated by surface water productivity. The annual radial growth rate of P. pacifica varied between 0.23 and 0.58 mm.yr-1 in the samples studied - considerably higher than growth rates of a similar species in the North Atlantic. Geographic variation in growth rates is likely influenced by primary productivity. Thesis Newfoundland studies North Atlantic University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Pacific Dixon Entrance ENVELOPE(-132.003,-132.003,54.416,54.416) |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Zooxanthellate corals--Northeast Pacific Ocean Paleoceanography--Northeast Pacific Ocean Sclerochronology--Northeast Pacific Ocean Deep sea corals--Habitat--Northeast Pacific Ocean Deep sea corals--Effect of environment on--Northeast Pacific Ocean |
spellingShingle |
Zooxanthellate corals--Northeast Pacific Ocean Paleoceanography--Northeast Pacific Ocean Sclerochronology--Northeast Pacific Ocean Deep sea corals--Habitat--Northeast Pacific Ocean Deep sea corals--Effect of environment on--Northeast Pacific Ocean Aranha, Renita Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives |
topic_facet |
Zooxanthellate corals--Northeast Pacific Ocean Paleoceanography--Northeast Pacific Ocean Sclerochronology--Northeast Pacific Ocean Deep sea corals--Habitat--Northeast Pacific Ocean Deep sea corals--Effect of environment on--Northeast Pacific Ocean |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 2010. Earth Sciences Includes bibliographical references. A sclerochronological study of two common cold-water corals from the Northeast Pacific, Stylaster campylecus parageus and Primnoa pacifica, was performed on specimens collected in 2008 from Dixon Entrance, BC, and the Olympic Coast National Marine Sanctuary, Washington State. SEM imaging of S. campylecus revealed the presence of growth banding and extensive skeletal remineralization. Profiles of Na/Ca, Mg/Ca, Sr/Ca and Ba/Ca could, however, be obtained with Secondary Ion Mass Spectrometry. Sr/Ca values were observed to display two maxima over distances covering approximately 12 growth bands, with corresponding minima in Mg/Ca and Na/Ca. These cyclical co-variations were interpreted to be primarily influenced by surface water productivity. This cyclicity in the trace element profiles, in the context of a documented biannual increase in productivity, suggested that the growth bands are monthly. -- The average radial growth rate of S. campylecus was 1.4 ± 0.1 mm.yr-1, and the average axial growth rate was 17.3 ± 1.1 mm.yr-1. Temperature changes cannot account for the variation in Mg/Ca and Sr/Ca in either S. campylecus or P. pacifica. These variations appear instead to be modulated by surface water productivity. The annual radial growth rate of P. pacifica varied between 0.23 and 0.58 mm.yr-1 in the samples studied - considerably higher than growth rates of a similar species in the North Atlantic. Geographic variation in growth rates is likely influenced by primary productivity. |
author2 |
Memorial University of Newfoundland. Dept. of Earth Sciences |
format |
Thesis |
author |
Aranha, Renita |
author_facet |
Aranha, Renita |
author_sort |
Aranha, Renita |
title |
Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives |
title_short |
Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives |
title_full |
Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives |
title_fullStr |
Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives |
title_full_unstemmed |
Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives |
title_sort |
geochemistry, microstructure and growth banding in stylaster campylecus parageus and primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives |
publishDate |
2010 |
url |
http://collections.mun.ca/cdm/ref/collection/theses5/id/38850 |
op_coverage |
Pacific Ocean |
long_lat |
ENVELOPE(-132.003,-132.003,54.416,54.416) |
geographic |
Pacific Dixon Entrance |
geographic_facet |
Pacific Dixon Entrance |
genre |
Newfoundland studies North Atlantic University of Newfoundland |
genre_facet |
Newfoundland studies North Atlantic University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
http://collections.mun.ca/theses_extras/Aranha_Renita.zip Electronic Theses and Dissertations (19.60 MB) -- http://collections.mun.ca/PDFs/theses/Aranha_Renita.pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/38850 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766113444742823936 |