Taxonomic composition and growth rates of phytoplankton assemblages at the Subtropical Convergence east of New Zealand
Off the eastern coast of New Zealand, warm, saline, nutrient-poor Subtropical Waters (STW) are separated from. cool, fresher, relatively nutrient-rich Sub-Antarctic Waters (SAW) by the Subtropical Convergence (STC). The Chatham Rise, a submarine rise, restricts. the latitudinal movement of the STC a...
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-2006 2023-06-11T04:03:58+02:00 Taxonomic composition and growth rates of phytoplankton assemblages at the Subtropical Convergence east of New Zealand Delizo, L Smith, WO Hall, J 2007-01-01T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/1006 doi: 10.1093/plankt/fbm047 https://scholarworks.wm.edu/context/vimsarticles/article/2006/viewcontent/fbm047.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/1006 doi: 10.1093/plankt/fbm047 https://scholarworks.wm.edu/context/vimsarticles/article/2006/viewcontent/fbm047.pdf VIMS Articles Central Equatorial Pacific Chlorophyll-Labeling Method Sub-Arctic Pacific Community Structure Photosynthetic Pigments Grazing Impact Chatham Rise Ocean Iron Carbon Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries text 2007 ftwilliammarycol https://doi.org/10.1093/plankt/fbm047 2023-05-04T17:43:38Z Off the eastern coast of New Zealand, warm, saline, nutrient-poor Subtropical Waters (STW) are separated from. cool, fresher, relatively nutrient-rich Sub-Antarctic Waters (SAW) by the Subtropical Convergence (STC). The Chatham Rise, a submarine rise, restricts. the latitudinal movement of the STC as well as mixing of STW and SAW Due to this restriction, this sector of the STC is characterized by sharp gradients in temperature, macro-(nitrate, silicate and phosphate) and micro- (iron) nutrient concentrations. Shipboard incubations were conducted during austral spring 2000 and 2001 to test the hypothesis that these gradients affect the taxonomic composition and/or growth rates of phytoplankton on either side of and at the STC. Maximum chlorophyll a concentrations during 2000 were 0.39 mu g L-1 but were an order of magnitude higher in 2001. During both years, STC phytoplankton were dominated by diatoms (77% of the to a chlorophyll a during austral spring 2000 and 70% during spring 2001), whereas crytopytes and prasinopytes dominated STW,assemblages (27 and 36% during 2000, and 63 and 17% during 2001). Chlorophyll in the SAW was dominated by procaryotes and photosynthetic nanoflagellates during 2000 (17% procaryotes. 68% nanoflagellates), and by diatoms during the austral spring 2001 cruise (53%). Growth rates of the phytoplankton assemblage were determined by C-14-labeling of chlorophyll a and photosynthetic pigments. During 2000, temperature-normalized growth rates were near maximal ai the STC, and decreased on average to less than half of the maximum north and south of that front, whereas in 2001 both absolute and relative growth rates were low at all stations. Growth rates did not closely parallel biomass of the various taxa, suggesting that nutrient limitation and/or grazing were significantly impacting standing stocks. It appeared that growth was strongly influenced by nutrients and light, but that biomass was more strongly influenced by grazing The STC is a globally important region of enhanced biomass and ... Text Antarc* Antarctic Arctic Phytoplankton W&M ScholarWorks Arctic Antarctic Austral Pacific New Zealand Journal of Plankton Research 29 8 655 670 |
institution |
Open Polar |
collection |
W&M ScholarWorks |
op_collection_id |
ftwilliammarycol |
language |
unknown |
topic |
Central Equatorial Pacific Chlorophyll-Labeling Method Sub-Arctic Pacific Community Structure Photosynthetic Pigments Grazing Impact Chatham Rise Ocean Iron Carbon Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries |
spellingShingle |
Central Equatorial Pacific Chlorophyll-Labeling Method Sub-Arctic Pacific Community Structure Photosynthetic Pigments Grazing Impact Chatham Rise Ocean Iron Carbon Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries Delizo, L Smith, WO Hall, J Taxonomic composition and growth rates of phytoplankton assemblages at the Subtropical Convergence east of New Zealand |
topic_facet |
Central Equatorial Pacific Chlorophyll-Labeling Method Sub-Arctic Pacific Community Structure Photosynthetic Pigments Grazing Impact Chatham Rise Ocean Iron Carbon Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries |
description |
Off the eastern coast of New Zealand, warm, saline, nutrient-poor Subtropical Waters (STW) are separated from. cool, fresher, relatively nutrient-rich Sub-Antarctic Waters (SAW) by the Subtropical Convergence (STC). The Chatham Rise, a submarine rise, restricts. the latitudinal movement of the STC as well as mixing of STW and SAW Due to this restriction, this sector of the STC is characterized by sharp gradients in temperature, macro-(nitrate, silicate and phosphate) and micro- (iron) nutrient concentrations. Shipboard incubations were conducted during austral spring 2000 and 2001 to test the hypothesis that these gradients affect the taxonomic composition and/or growth rates of phytoplankton on either side of and at the STC. Maximum chlorophyll a concentrations during 2000 were 0.39 mu g L-1 but were an order of magnitude higher in 2001. During both years, STC phytoplankton were dominated by diatoms (77% of the to a chlorophyll a during austral spring 2000 and 70% during spring 2001), whereas crytopytes and prasinopytes dominated STW,assemblages (27 and 36% during 2000, and 63 and 17% during 2001). Chlorophyll in the SAW was dominated by procaryotes and photosynthetic nanoflagellates during 2000 (17% procaryotes. 68% nanoflagellates), and by diatoms during the austral spring 2001 cruise (53%). Growth rates of the phytoplankton assemblage were determined by C-14-labeling of chlorophyll a and photosynthetic pigments. During 2000, temperature-normalized growth rates were near maximal ai the STC, and decreased on average to less than half of the maximum north and south of that front, whereas in 2001 both absolute and relative growth rates were low at all stations. Growth rates did not closely parallel biomass of the various taxa, suggesting that nutrient limitation and/or grazing were significantly impacting standing stocks. It appeared that growth was strongly influenced by nutrients and light, but that biomass was more strongly influenced by grazing The STC is a globally important region of enhanced biomass and ... |
format |
Text |
author |
Delizo, L Smith, WO Hall, J |
author_facet |
Delizo, L Smith, WO Hall, J |
author_sort |
Delizo, L |
title |
Taxonomic composition and growth rates of phytoplankton assemblages at the Subtropical Convergence east of New Zealand |
title_short |
Taxonomic composition and growth rates of phytoplankton assemblages at the Subtropical Convergence east of New Zealand |
title_full |
Taxonomic composition and growth rates of phytoplankton assemblages at the Subtropical Convergence east of New Zealand |
title_fullStr |
Taxonomic composition and growth rates of phytoplankton assemblages at the Subtropical Convergence east of New Zealand |
title_full_unstemmed |
Taxonomic composition and growth rates of phytoplankton assemblages at the Subtropical Convergence east of New Zealand |
title_sort |
taxonomic composition and growth rates of phytoplankton assemblages at the subtropical convergence east of new zealand |
publisher |
W&M ScholarWorks |
publishDate |
2007 |
url |
https://scholarworks.wm.edu/vimsarticles/1006 https://scholarworks.wm.edu/context/vimsarticles/article/2006/viewcontent/fbm047.pdf |
geographic |
Arctic Antarctic Austral Pacific New Zealand |
geographic_facet |
Arctic Antarctic Austral Pacific New Zealand |
genre |
Antarc* Antarctic Arctic Phytoplankton |
genre_facet |
Antarc* Antarctic Arctic Phytoplankton |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/1006 doi: 10.1093/plankt/fbm047 https://scholarworks.wm.edu/context/vimsarticles/article/2006/viewcontent/fbm047.pdf |
op_doi |
https://doi.org/10.1093/plankt/fbm047 |
container_title |
Journal of Plankton Research |
container_volume |
29 |
container_issue |
8 |
container_start_page |
655 |
op_container_end_page |
670 |
_version_ |
1768384761757171712 |