Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives
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. campy...
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Memorial University of Newfoundland
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ftmemorialuniv:oai:research.library.mun.ca:9617 2023-10-01T03:58:01+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 2010 application/pdf https://research.library.mun.ca/9617/ https://research.library.mun.ca/9617/1/Aranha_Renita.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/9617/1/Aranha_Renita.pdf Aranha, Renita <https://research.library.mun.ca/view/creator_az/Aranha=3ARenita=3A=3A.html> (2010) Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives. Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 2010 ftmemorialuniv 2023-09-03T06:47:28Z 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 North Atlantic Memorial University of Newfoundland: Research Repository Pacific Dixon Entrance ENVELOPE(-132.003,-132.003,54.416,54.416) |
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Memorial University of Newfoundland: Research Repository |
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ftmemorialuniv |
language |
English |
description |
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. |
format |
Thesis |
author |
Aranha, Renita |
spellingShingle |
Aranha, Renita Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives |
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 |
publisher |
Memorial University of Newfoundland |
publishDate |
2010 |
url |
https://research.library.mun.ca/9617/ https://research.library.mun.ca/9617/1/Aranha_Renita.pdf |
long_lat |
ENVELOPE(-132.003,-132.003,54.416,54.416) |
geographic |
Pacific Dixon Entrance |
geographic_facet |
Pacific Dixon Entrance |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://research.library.mun.ca/9617/1/Aranha_Renita.pdf Aranha, Renita <https://research.library.mun.ca/view/creator_az/Aranha=3ARenita=3A=3A.html> (2010) Geochemistry, microstructure and growth banding in Stylaster campylecus parageus and Primnoa pacifica : implications for commonly observed deep sea corals as paleoceanographic archives. Masters thesis, Memorial University of Newfoundland. |
op_rights |
thesis_license |
_version_ |
1778530355910803456 |