The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration

Fieldwork was conducted at three contrasting sites to test the applicability of an in situ technique (ZOOFLUX) for the assessment of the role of zooplankton diel vertical migration (DVM) in the removal of carbon and nitrogen from the surface layer of the ocean to the depths (the active flux). ZOOFLU...

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Main Author: Jarvis, Toby
Format: Thesis
Language:unknown
Published: 2003
Subjects:
Online Access:https://oro.open.ac.uk/63236/
https://oro.open.ac.uk/63236/1/C813945.pdf
https://doi.org/10.21954/ou.ro.0000f704
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spelling ftopenunivgb:oai:oro.open.ac.uk:63236 2023-06-11T04:10:45+02:00 The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration Jarvis, Toby 2003-06-09 application/pdf https://oro.open.ac.uk/63236/ https://oro.open.ac.uk/63236/1/C813945.pdf https://doi.org/10.21954/ou.ro.0000f704 unknown https://oro.open.ac.uk/63236/1/C813945.pdf Jarvis, Toby (2003). The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration. PhD thesis The Open University. Thesis Public PeerReviewed 2003 ftopenunivgb https://doi.org/10.21954/ou.ro.0000f704 2023-05-28T06:00:39Z Fieldwork was conducted at three contrasting sites to test the applicability of an in situ technique (ZOOFLUX) for the assessment of the role of zooplankton diel vertical migration (DVM) in the removal of carbon and nitrogen from the surface layer of the ocean to the depths (the active flux). ZOOFLUX relies on the detection of a significant dawn-dusk difference in the carbon and nitrogen weight of migrating individuals (δ). Therefore, its successful application is highly dependent upon the ecology of the migrant species, the level of individual variability in carbon and nitrogen weight (V), and the number of samples that can be collected (n) . At site 1 (the Clyde Sea, western Scotland), Calanus finmarchicus and C. helgolandicus exhibited a variety of migration patterns, and did not always conform to the ‘normal’ DVM pattern of up at dusk and down at dawn (NDVM). As a result, δ was variable and V relatively high, while n was relatively low. When δ was non-significant, the probability of making a Type II statistical error (β) was high. In most cases, both the minimum number of samples (n min ) , and the minimum diel change occurring in carbon and nitrogen weight (δ min ) , would have needed to be unrealistically high before ZOOFLUX was applicable to these species. At site 2 (the Sargasso Sea off Bermuda), Pleuromamma xiphias and krill ( Thysanopoda aequalis, Euphausia hemigibba , and E. brevis ) both performed NDVM. At site 3 (Doubtful Sound, New Zealand), Nyctiphanes australis performed NDVM at the population level, but some individuals remained at depth during the night, and others at the surface during the day. Despite the more uniform pattern of NDVM at both of these sites, the findings were similar to those at site 1:δ was variable, V relatively high, and n relatively low. Again, this meant that (n min ) and (δ min ) were often unrealistically high. These findings are discussed in terms of (1) what we can now say about the factors contributing to the active flux, (2) the applicability of the ZOOFLUX ... Thesis Calanus finmarchicus The Open University: Open Research Online (ORO) New Zealand
institution Open Polar
collection The Open University: Open Research Online (ORO)
op_collection_id ftopenunivgb
language unknown
description Fieldwork was conducted at three contrasting sites to test the applicability of an in situ technique (ZOOFLUX) for the assessment of the role of zooplankton diel vertical migration (DVM) in the removal of carbon and nitrogen from the surface layer of the ocean to the depths (the active flux). ZOOFLUX relies on the detection of a significant dawn-dusk difference in the carbon and nitrogen weight of migrating individuals (δ). Therefore, its successful application is highly dependent upon the ecology of the migrant species, the level of individual variability in carbon and nitrogen weight (V), and the number of samples that can be collected (n) . At site 1 (the Clyde Sea, western Scotland), Calanus finmarchicus and C. helgolandicus exhibited a variety of migration patterns, and did not always conform to the ‘normal’ DVM pattern of up at dusk and down at dawn (NDVM). As a result, δ was variable and V relatively high, while n was relatively low. When δ was non-significant, the probability of making a Type II statistical error (β) was high. In most cases, both the minimum number of samples (n min ) , and the minimum diel change occurring in carbon and nitrogen weight (δ min ) , would have needed to be unrealistically high before ZOOFLUX was applicable to these species. At site 2 (the Sargasso Sea off Bermuda), Pleuromamma xiphias and krill ( Thysanopoda aequalis, Euphausia hemigibba , and E. brevis ) both performed NDVM. At site 3 (Doubtful Sound, New Zealand), Nyctiphanes australis performed NDVM at the population level, but some individuals remained at depth during the night, and others at the surface during the day. Despite the more uniform pattern of NDVM at both of these sites, the findings were similar to those at site 1:δ was variable, V relatively high, and n relatively low. Again, this meant that (n min ) and (δ min ) were often unrealistically high. These findings are discussed in terms of (1) what we can now say about the factors contributing to the active flux, (2) the applicability of the ZOOFLUX ...
format Thesis
author Jarvis, Toby
spellingShingle Jarvis, Toby
The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration
author_facet Jarvis, Toby
author_sort Jarvis, Toby
title The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration
title_short The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration
title_full The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration
title_fullStr The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration
title_full_unstemmed The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration
title_sort vertical export of carbon and nitrogen caused by zooplankton diel vertical migration
publishDate 2003
url https://oro.open.ac.uk/63236/
https://oro.open.ac.uk/63236/1/C813945.pdf
https://doi.org/10.21954/ou.ro.0000f704
geographic New Zealand
geographic_facet New Zealand
genre Calanus finmarchicus
genre_facet Calanus finmarchicus
op_relation https://oro.open.ac.uk/63236/1/C813945.pdf
Jarvis, Toby (2003). The vertical export of carbon and nitrogen caused by zooplankton diel vertical migration. PhD thesis The Open University.
op_doi https://doi.org/10.21954/ou.ro.0000f704
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