Comparisons of Calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter
The response of an optical plankton counter (OPC) to concentrations of Calanus finmarchicus fifth copepodites (C5) ranging from 2 to 1621 copepods m−3 was examined during the summers of 1999–2001 over the continental shelf of the northwest Atlantic Ocean. Net tows from either a bongo net or a multip...
Published in: | Journal of Plankton Research |
---|---|
Main Author: | |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
2003
|
Subjects: | |
Online Access: | http://plankt.oxfordjournals.org/cgi/content/short/25/7/855 https://doi.org/10.1093/plankt/25.7.855 |
id |
fthighwire:oai:open-archive.highwire.org:plankt:25/7/855 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:plankt:25/7/855 2023-05-15T15:47:56+02:00 Comparisons of Calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter Baumgartner, Mark F. 2003-07-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/25/7/855 https://doi.org/10.1093/plankt/25.7.855 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/25/7/855 http://dx.doi.org/10.1093/plankt/25.7.855 Copyright (C) 2003, Oxford University Press ORIGINAL ARTICLES TEXT 2003 fthighwire https://doi.org/10.1093/plankt/25.7.855 2013-05-26T15:13:40Z The response of an optical plankton counter (OPC) to concentrations of Calanus finmarchicus fifth copepodites (C5) ranging from 2 to 1621 copepods m−3 was examined during the summers of 1999–2001 over the continental shelf of the northwest Atlantic Ocean. Net tows from either a bongo net or a multiple opening/closing net and environmental sensing system (MOCNESS) were collocated with vertical OPC casts to provide comparable data. OPC-derived particle abundance in the 1.5–2.0 mm equivalent circular diameter range was strongly correlated with net-derived abundance of C. finmarchicus C5 (r2 = 0.655 and 0.726 for comparisons in two independent datasets). Particle abundance in this size range increased with increases in the descent speed of the vertically profiled OPC, which indicated avoidance of the small sampling aperture by C. finmarchicus C5. A regression model was developed to relate OPC particle abundance in the 1.5–2.0 mm size range to the abundance of C. finmarchicus C5 and the descent speed of the OPC. The data fitted the model well (r2 = 0.684) and the inverted model was used as a calibration equation to predict C. finmarchicus C5 abundances from OPC measurements in an independent comparison to net abundances. In that case, the calibration equation underestimated net abundance by an average factor of 2. However, anomalously low OPC particle abundances for some casts suggest that spatial heterogeneity (patchiness) can confound such comparisons. Text Calanus finmarchicus Northwest Atlantic Copepods HighWire Press (Stanford University) Journal of Plankton Research 25 7 855 868 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
spellingShingle |
ORIGINAL ARTICLES Baumgartner, Mark F. Comparisons of Calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter |
topic_facet |
ORIGINAL ARTICLES |
description |
The response of an optical plankton counter (OPC) to concentrations of Calanus finmarchicus fifth copepodites (C5) ranging from 2 to 1621 copepods m−3 was examined during the summers of 1999–2001 over the continental shelf of the northwest Atlantic Ocean. Net tows from either a bongo net or a multiple opening/closing net and environmental sensing system (MOCNESS) were collocated with vertical OPC casts to provide comparable data. OPC-derived particle abundance in the 1.5–2.0 mm equivalent circular diameter range was strongly correlated with net-derived abundance of C. finmarchicus C5 (r2 = 0.655 and 0.726 for comparisons in two independent datasets). Particle abundance in this size range increased with increases in the descent speed of the vertically profiled OPC, which indicated avoidance of the small sampling aperture by C. finmarchicus C5. A regression model was developed to relate OPC particle abundance in the 1.5–2.0 mm size range to the abundance of C. finmarchicus C5 and the descent speed of the OPC. The data fitted the model well (r2 = 0.684) and the inverted model was used as a calibration equation to predict C. finmarchicus C5 abundances from OPC measurements in an independent comparison to net abundances. In that case, the calibration equation underestimated net abundance by an average factor of 2. However, anomalously low OPC particle abundances for some casts suggest that spatial heterogeneity (patchiness) can confound such comparisons. |
format |
Text |
author |
Baumgartner, Mark F. |
author_facet |
Baumgartner, Mark F. |
author_sort |
Baumgartner, Mark F. |
title |
Comparisons of Calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter |
title_short |
Comparisons of Calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter |
title_full |
Comparisons of Calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter |
title_fullStr |
Comparisons of Calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter |
title_full_unstemmed |
Comparisons of Calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter |
title_sort |
comparisons of calanus finmarchicus fifth copepodite abundance estimates from nets and an optical plankton counter |
publisher |
Oxford University Press |
publishDate |
2003 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/25/7/855 https://doi.org/10.1093/plankt/25.7.855 |
genre |
Calanus finmarchicus Northwest Atlantic Copepods |
genre_facet |
Calanus finmarchicus Northwest Atlantic Copepods |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/25/7/855 http://dx.doi.org/10.1093/plankt/25.7.855 |
op_rights |
Copyright (C) 2003, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/25.7.855 |
container_title |
Journal of Plankton Research |
container_volume |
25 |
container_issue |
7 |
container_start_page |
855 |
op_container_end_page |
868 |
_version_ |
1766382913068204032 |